Features

Overview of KSeF Guard offline pre-submission validation capabilities

XSD Validation

Structural XML verification against the official FA(3) schema from the Ministry of Finance. Powered by libxml2 — an industry-standard XML validation engine. Precise error messages with exact locations in your XML.

FA_2026_03_0001.xml

Valid

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<?xml version="1.0" encoding="UTF-8"?>

<SystemInfo>KSeF Guard Showcase</SystemInfo>

</Naglowek>

<Adres><KodKraju>PL</KodKraju><AdresL1>ul. Marszalkowska 1, Warszawa</AdresL1></Adres>

</Podmiot1>

<Nazwa>XYZ Trading Sp. z o.o.</Nazwa>

</DaneIdentyfikacyjne>

<Adres><KodKraju>PL</KodKraju><AdresL1>ul. Poznanska 10, Poznan</AdresL1></Adres>

</Podmiot2>

<Fa>

<P_1>2026-03-10</P_1>

<P_2>FV/2026/03/0001</P_2>

<P_13_1>1000.00</P_13_1><P_14_1>230.00</P_14_1>

<P_15>1230.00</P_15>

<P_16>2</P_16><P_17>2</P_17><P_18>2</P_18><P_18A>2</P_18A>

<P_23>2</P_23>

</Adnotacje>

<NrWierszaFa>1</NrWierszaFa><P_7>Uslugi konsultingowe IT</P_7>

<P_8A>godz</P_8A><P_8B>10.00</P_8B><P_9A>100.00</P_9A><P_9B>123.00</P_9B>

<P_11>1000.00</P_11><P_11A>1230.00</P_11A><P_11Vat>230.00</P_11Vat><P_12>23</P_12>

</FaWiersz>

</Fa>

</Faktura>

FA_2026_03_0156.xml

XSD Error

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<?xml version="1.0" encoding="UTF-8"?>

<Faktura xmlns:etd="http://crd.gov.pl..." xmlns:xsi="http://www.w3.org..."

xmlns="http://crd.gov.pl...">

<SystemInfo>KSeF Guard Showcase</SystemInfo>

</Naglowek>

↳ Fix: NIP must be exactly 10 digits without dashes — e.g. 9999999999

<Nazwa>TechStar Sp. z o.o.</Nazwa>

</DaneIdentyfikacyjne>

<Adres>

<AdresL1>ul. Wspolna 30, Wroclaw</AdresL1>

</Adres>

</Podmiot1>

<Nazwa>DataCenter Sp. z o.o.</Nazwa>

</DaneIdentyfikacyjne>

<Adres>

<AdresL1>ul. Serwerowa 5, Poznan</AdresL1>

</Adres>

</Podmiot2>

<Fa>

<P_1>2026-03-18</P_1>

<P_2>FV/2026/03/0156</P_2>

<P_13_1>1666.66</P_13_1>

<P_14_1>383.33</P_14_1>

<P_13_3>0.95</P_13_3>

<P_14_3>0.05</P_14_3>

<P_15>2051.00</P_15>

<P_16>2</P_16>

<P_17>2</P_17>

<P_18>2</P_18>

<P_18A>2</P_18A>

<P_19N>1</P_19N>

</Zwolnienie>

<P_22N>1</P_22N>

</NoweSrodkiTransportu>

<P_23>2</P_23>

<P_PMarzyN>1</P_PMarzyN>

</PMarzy>

</Adnotacje>

<P_7>Serwery i osprzet sieciowy</P_7>

<P_8A>szt</P_8A>

<P_8B>1</P_8B>

<P_9A>1626.01</P_9A>

<P_11>1626.01</P_11>

<P_12>23</P_12>

</FaWiersz>

<P_7>Konfiguracja i wniesienie sprzetu</P_7>

<P_8A>szt</P_8A>

<P_8B>1</P_8B>

<P_9A>40.65</P_9A>

<P_11>40.65</P_11>

<P_12>23</P_12>

</FaWiersz>

<P_7>Kabel sieciowy promocyjny</P_7>

<P_8A>szt</P_8A>

<P_8B>1</P_8B>

<P_9A>0.95</P_9A>

<P_11>0.95</P_11>

<P_12>5</P_12>

</FaWiersz>

</Platnosc>

</Fa>

</Faktura>

PASS FA_2026_03_0001.xml FAIL FA_2026_03_0156.xml

XSD Error Line 14: NIP pattern violation — expected [0-9]{10}, got 999-999-99-99

XSD: schema FA(3) 1-0E • 128 rules • libxml2

128 Validation Rules

Substantive rules based on Art. 106e of the VAT Act, Ministry of Finance regulations, and the official FA(3) information brochure. 71 government-mandated, the rest best-practice, heuristic, security, batch, and inferred. Every rule includes bilingual problem/fix descriptions and SHA-256 verified source quotes.

Rule Explorer 128 rules

Search rules...

Rule ID

Description

Classification

KSeF Gov Enforced

Severity

KSEF-BUS-003

All P_14_*W fields required for foreign currency in corresponding rate brackets

GOV_MANDATED

ERROR

KSEF-BUS-006

Exchange rate missing for foreign currency invoice

GOV_MANDATED

ERROR

KSEF-BUS-030

Invoice issue date exceeds the allowed future-date window

GOV_MANDATED

KSeF Gov Enforced

ERROR

KSEF-BUS-044

Line net value consistent with quantity × adjusted unit price

GOV_MANDATED

ERROR

KSEF-BUS-072

Tax rate must be consistent with net amount bucket (simplified invoices exempt)

BEST_PRACTICE

ERROR

KSEF-BUS-074

P_19=1 without providing exemption basis (P_19A/B/C)

GOV_MANDATED

KSeF Gov Enforced

ERROR

↓ 122 more rules

KSEF-BUS-003 GOV MANDATED ERROR KSEF GUARD ONLY

All P_14_*W fields required for foreign currency in corresponding rate brackets

Wszystkie pola P_14_*W wymagane dla waluty obcej w odpowiednich przedziałach stawek

Problem

Foreign currency invoice is missing a P_14_*W field (VAT amount converted to PLN) for at least one rate bracket that has foreign-currency VAT.

How to Fix

Open the foreign currency invoice and fill in the missing P_14_*W field (P_14_1W, P_14_2W, P_14_3W, or P_14_4W) with VAT converted to PLN (using the conversion rate applicable to the invoice per Art. 31a of the VAT Act) in the summary section.

Source Quote

”Fields P_14_1W, P_14_2W, P_14_3W and P_14_4W are required when the invoice is issued in foreign currency. Each field contains the tax amount converted to PLN in accordance with Art. 106e sec. 11 of the VAT Act — for the basic rate (23%/22%), first reduced rate (8%/7%), second reduced rate (5%), and taxi lump sum respectively. The P_14_*W field must be present for each rate bracket (P_14_*) that appears on the invoice.”

DESCRIPTION SHA-256: ac9125634746…

KSEF-BUS-006 GOV MANDATED ERROR KSEF GUARD ONLY

Exchange rate missing for foreign currency invoice

Brak kursu waluty dla faktury w walucie obcej

Problem

Foreign currency invoice has VAT amounts in foreign currency (P_14_*W), but no exchange rate is provided. Either KursWalutyZ (global invoice rate) or KursWaluty (per-line rate) must be specified.

How to Fix

Provide the exchange rate in KursWalutyZ (global rate for the entire invoice) or KursWaluty (per-line rate). The rate should follow Art. 31a — the average NBP rate from the last business day before the tax obligation arises.

Source Quote

“The exchange rate used to calculate the amount of tax, in cases referred to in sec. VI of the Act. When amounts used for determining the tax base are provided in a foreign currency, the exchange rate applicable to a given line of the invoice shall be indicated.”

DESCRIPTION SHA-256: c2fd221e087382ca…

KSEF-BUS-030 GOV MANDATED ERROR KSeF GOV ENFORCED

Invoice issue date exceeds the allowed future-date window

Data wystawienia przekracza dozwolone okno przyszłej daty

Problem

Invoice issue date (P_1) is set in the future beyond the allowed window. The evaluator applies a 30-day forward threshold from the reference date as a safeguard against obvious date errors.

How to Fix

Check the invoice issue date (P_1). The statutory requirement (Art. 106i) defines invoice issuance deadlines; the 30-day threshold is an evaluator tolerance preventing obvious date errors.

Source Quote

“Art. 106na sec. 1 of the Act stipulates that a structured invoice is deemed to have been issued on the date it is sent to KSeF. The date of issue of the structured invoice indicated by the taxpayer in field P_1 is consistent with the date of sending the invoice to KSeF.”

DESCRIPTION SHA-256: fde059cc6450d9de…

KSEF-BUS-044 GOV MANDATED ERROR KSEF GUARD ONLY

Line net value consistent with quantity × adjusted unit price

Wartość netto wiersza spójna z ilością × skorygowana cena jednostkowa

Problem

Line net value (P_11) does not match the product of quantity and unit price adjusted for discounts/surcharges. The evaluator verifies the formula: P_11 ≈ P_8B × (P_9A − P_10 + P_10_Dodatki) with ±0.02 PLN tolerance.

How to Fix

Check the invoice line calculation. The legal basis requires disclosure of: quantity (P_8B), net unit price (P_9A), and net value (P_11). The evaluator verifies arithmetic consistency of these fields accounting for discount (P_10) and surcharge (P_10_Dodatki).

Source Quote

“11) Value of goods delivered or services provided covered by the transaction, excluding tax amount (net sales value)”

VERBATIM SHA-256: 2a85116fe70ae9ce…

KSEF-BUS-072 BEST PRACTICE ERROR KSEF GUARD ONLY

Tax rate must be consistent with net amount bucket (simplified invoices exempt)

Stawka podatku musi być zgodna z przedziałem kwot netto (faktury uproszczone pominięte)

Problem

Invoice line VAT rate (P_12 — VAT rate) does not have a matching net summary bucket (P_13_*). Each applied rate must have its corresponding bucket in the summary. This rule does not apply to simplified invoices (UPR).

How to Fix

Recalculate the invoice summary. Rate-to-bucket mapping: 23%/22% -> P_13_1, 8%/7% -> P_13_2, 5% -> P_13_3, zw (exempt) -> P_13_7, oo (reverse charge) -> P_13_10, 0% -> P_13_6_*.

Source Quote

“Tax rates from line items (P_12) must be consistent with the breakdown of net sales values in the summary fields according to rates (P_13_*).”

DESCRIPTION SHA-256: c431900779d346a3…

KSEF-BUS-074 GOV MANDATED ERROR KSeF GOV ENFORCED

P_19=1 without providing exemption basis (P_19A/B/C)

P_19=1 bez podania podstawy zwolnienia (P_19A/B/C)

Problem

Invoice has VAT exemption (P_19 set) but none of the legal basis fields (P_19A, P_19B, P_19C) are populated.

How to Fix

Fill at least one field: P_19A (VAT Act provision), P_19B (provision of Directive 2006/112/EC), or P_19C (other legal basis).

Source Quote

”If P_19='1' (VAT exemption), at least one of P_19A (act provision), P_19B (Directive 2006/112/EC provision), or P_19C (other legal basis) must be filled in, indicating the legal basis for the exemption.”

DESCRIPTION SHA-256: 794cdd84f1c9468b…

5 Export Formats

Text and Summary (Free). CSV, JSON, and PDF (Standard+). PDF includes legal citations, risk scores, and source quotes. All formats bilingual — Polish and English.

PDF A4 · DejaVu Sans · EN

Expand

KSeF Guard

Validation Report

Date: 2026-05-03

KSeF Guard

Walidator FA(3)

Executive Summary

Files

PASS

FAIL

Pass Rate

17%

Rules evaluated: 128 | Errors: 9 | Warnings: 4 | XSD: 1

File Index

#	Status	Filename	Błędy	Ostrz.	XSD	Risk	Str.
1	FAIL	FA_2026_01_0201.xml	1	1	0	25	1
2	FAIL	FA_2026_02_0042.xml	3	1	0	65	2
3	FAIL	FA_2026_02_0099.xml	1	1	0	25	4
4	FAIL	FA_2026_02_0187.xml	2	1	0	25	6
5	PASS	FA_2026_03_0001.xml	0	0	0	0	7
6	FAIL	FA_2026_03_0156.xml	2	0	1	40	9

FAIL FA_2026_01_0201.xml Errors: 1 | Warnings: 1

[ERROR] KSEF-BUS-044 Legal

Problem:

Line net value (P_11 — net amount) does not match the formula: quantity (P_8B) × (unit price P_9A − discount P_10 + surcharge P_10_Dodatki). Please check the line calculation.

What to fix:

Check the invoice line calculations — the net amount (P_11) should equal P_8B × (P_9A − P_10 + P_10_Dodatki), rounded to grosz (tolerance: 0.02 PLN).

Evidence:

Value: NrWierszaFa=2; P_8B=10.00; P_9A=50.00; P_11=0.00

Path: /Faktura/Fa/FaWiersz/P_11

Line: 44

XML Preview Line 44

41<FaWiersz>

42 <NrWierszaFa>2</NrWierszaFa><P_7>Instalacja paneli</P_7>

43 <P_8A>szt</P_8A><P_8B>10.00</P_8B><P_9A>50.00</P_9A><P_9B>0.00</P_9B>

44 <P_11>0.00</P_11><P_11A>0.00</P_11A><P_11Vat>0.00</P_11Vat><P_12>23</P_12>

45</FaWiersz>

Fix: P_11 = 500.00

Quote:

"11) Value of goods delivered or services provided covered by the transaction, excluding tax amount (net sales value)"

Source: Ustawa o VAT Art. 106e ust. 1 pkt 11

TXT Expand

ksef-guard v1.0.0 | Preset: recommended | 128 rules

────────────────────────────────────────────────────

✗ FA_2026_01_0201.xml — FAIL

XSD: pass | Rules: 128 evaluated, 1 error(s), 1 warning(s)

[FAIL] KSEF-BUS-044 [GOV_MANDATED]

Problem: Wartość netto wiersza (P_11 — kwota netto) nie odpowiada formule…

Line net value (P_11 — net amount) does not match the formula…

Fix:Sprawdź obliczenia na pozycjach faktury — wartość netto (P_11)…

Check the invoice line calculations — the net amount (P_11)…

Evidence: NrWierszaFa=2; P_8B=10.00; P_9A=50.00; P_11=0.00

Path:/Faktura/Fa/FaWiersz/P_11

Source:Ustawa o VAT Art. 106e ust. 1 pkt 11

[WARN] KSEF-BUS-140 [BEST_PRACTICE]

Problem: Pozycja faktury ma zerową kwotę netto (P_11 — kwota netto = 0) przy stawce opodatkowanej…

Invoice line has zero net amount (P_11 — net amount = 0) with a taxable rate…

✗ FA_2026_02_0042.xml — FAIL

✗ FA_2026_02_0099.xml — FAIL

✗ FA_2026_02_0187.xml — FAIL

✓ FA_2026_03_0001.xml — PASS

✗ FA_2026_03_0156.xml — FAIL

────────────────────────────────────────────────────

Summary: 1 pass, 5 fail (6 files) in 285ms

Schema: FA(3) 1-0E | Registry: 1.0.0

CSV Expand

file_name	file_status	risk_score	violation_type	code	severity	classification
FA_2026_01_0201.xml	FAIL	25	RULE	KSEF-BUS-044	error	GOV_MANDATED
FA_2026_02_0042.xml	FAIL	65	RULE	KSEF-BUS-003	error	GOV_MANDATED
FA_2026_02_0099.xml	FAIL	25	RULE	KSEF-BUS-030	error	GOV_MANDATED
FA_2026_02_0187.xml	FAIL	25	RULE	KSEF-BUS-006	error	GOV_MANDATED
FA_2026_03_0001.xml	PASS	0	-	-	-	-
FA_2026_03_0156.xml	FAIL	40	XSD	FA3-XSD-E001	error	-

15 rows · 18 columns · UTF-8 BOM

JSON Expand

{

"rule_id": "KSEF-BUS-044",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"source_ref": "Ustawa o VAT Art. 106e ust. 1 pkt 11",

"problem_pl": "Wartość netto wiersza (P_11)…",

"problem_en": "Line net value (P_11 — net amount)…",

"reason_code": "KSEF-BUS-044_LINE_ARITHMETIC_MISMATCH|xml_line=44",

"fix_pl": "Sprawdź obliczenia na pozycjach…",

"fix_en": "Check the invoice line calculations…",

"quote_pl": "11) wartość dostarczonych towarów…",

"quote_en": "11) Value of goods delivered…",

"evidence_value": "NrWierszaFa=2; P_8B=10.00…",

"evidence_path": "/Faktura/Fa/FaWiersz/P_11",

"evidence_line": 44,

"correction_hint": "P_11 = 500.00",

"legal_basis": [

{ "title_pl": "Wymogi ustawowe…", "source": "Art. 106e ust. 1 pkt 8", … }

]

}

TXT .\ksef-guard.exe validate --preset recommended --format text Documents\Invoices

ksef-guard v1.0.0 | Preset: recommended | 128 rules

────────────────────────────────────────────────────────

✗ FA_2026_01_0201.xml — FAIL

XSD: pass | Rules: 128 evaluated, 1 error(s), 1 warning(s)

[FAIL] KSEF-BUS-044 [GOV_MANDATED]

Problem: Wartość netto wiersza (P_11 — kwota netto) nie odpowiada formule: ilość (P_8B) × (cena netto P_9A − rabat P_10 + narzut P_10_Dodatki).

Line net value (P_11 — net amount) does not match the formula: quantity (P_8B) × (unit price P_9A − discount P_10 + surcharge P_10_Dodatki).

Fix:Sprawdź obliczenia na pozycjach faktury — wartość netto (P_11) powinna wynikać z formuły: P_8B × (P_9A − P_10 + P_10_Dodatki), z dokładnością do groszy (tolerancja: 0,02 PLN).

Check the invoice line calculations — the net amount (P_11) should equal P_8B × (P_9A − P_10 + P_10_Dodatki), rounded to grosz (tolerance: 0.02 PLN).

Evidence: NrWierszaFa=2; P_8B=10.00; P_9A=50.00; P_11=0.00

Path:/Faktura/Fa/FaWiersz

Source:Ustawa o VAT Art. 106e ust. 1 pkt 11

[WARN] KSEF-BUS-140 [BEST_PRACTICE]

Problem: Pozycja faktury ma zerową kwotę netto (P_11 — kwota netto = 0) przy stawce opodatkowanej (np. 23%, 8%, 5%). Zerowa kwota netto ze stawką VAT jest podejrzana.

Invoice line has zero net amount (P_11 — net amount = 0) with a taxable rate (e.g. 23%, 8%, 5%). A zero net amount with a VAT rate is suspicious.

Fix:Sprawdź tę pozycję — jeśli kwota netto powinna być większa od zera, popraw ją. Dla pozycji bezpłatnych użyj stawki "zw" (zwolniona) lub "oo" (odwrotne obciążenie).

Check this line — if the net amount should be greater than zero, correct it. For free items, use the "zw" (exempt) or "oo" (reverse charge) rate instead.

Evidence: line 2 P_11=0 with taxable rate P_12='23'

Path:/Faktura/Fa/FaWiersz/P_11

Source:Broszura FA(3), sekcja FaWiersz — P_11

✗ FA_2026_02_0042.xml — FAIL

XSD: pass | Rules: 128 evaluated, 3 error(s), 1 warning(s)

[FAIL] KSEF-BUS-003 [GOV_MANDATED]

Problem: Faktura wystawiona w walucie obcej nie zawiera pola P_14_1W (kwota VAT przeliczona na PLN). Pole to jest wymagane dla każdego koszyka stawki z VAT walutowym.

Foreign currency invoice is missing the P_14_1W field (VAT amount converted to PLN). This field is required for each rate bracket that has foreign-currency VAT.

Fix:Otwórz fakturę walutową i uzupełnij pole P_14_1W kwotą VAT przeliczoną na PLN (wg kursu właściwego dla faktury, zgodnie z art. 31a ustawy o VAT) w sekcji podsumowania.

Open the foreign currency invoice and fill P_14_1W with VAT converted to PLN (using the conversion rate applicable to the invoice per Art. 31a of the VAT Act) in the summary section.

Evidence: KodWaluty=EUR

Path:/Faktura/Fa/P_14_1W

Source:Broszura FA(3), Tabela 26 — P_14_1W..P_14_4W

[FAIL] KSEF-BUS-005 [GOV_MANDATED]

Problem: Faktura walutowa zawiera kwoty VAT w walucie obcej, ale nie ma żadnego przeliczenia VAT na złotówki (pola P_14_*W).

Foreign currency invoice has VAT amounts in the foreign currency, but no PLN VAT conversion (P_14_*W fields) is present.

Source:VAT Act, Art. 106e sec. 11

[FAIL] KSEF-BUS-114 [GOV_MANDATED]

Problem: Faktura walutowa ma wypełnioną kwotę VAT w walucie (P_14_*), ale brak odpowiadającego przeliczenia na PLN (P_14_*W).

Foreign currency invoice has a VAT amount populated but the corresponding PLN conversion is missing.

Source:UoVAT, Art. 31a ust. 1

[WARN] KSEF-BUS-197 [HEURISTIC]

Problem: Faktura ma datę wystawienia (P_1) w weekend (sobota lub niedziela).

Evidence: P_1=2026-02-15 is Sunday

✗ FA_2026_02_0099.xml — FAIL

XSD: pass | Rules: 128 evaluated, 1 error(s), 1 warning(s)

[FAIL] KSEF-BUS-030 [GOV_MANDATED]

Problem: Data wystawienia faktury (P_1) jest ustawiona w przyszłości poza dozwolonym oknem (maks. 30 dni do przodu).

Invoice issue date (P_1) is set in the future beyond the allowed window (max 30 days ahead).

Evidence: P_1=2049-12-31

Source:Art. 106na sec. 1 of the VAT Act (LOGICAL_INFERENCE)

[WARN] KSEF-BUS-168 [HEURISTIC]

Problem: Data wystawienia faktury (P_1) jest ponad 60 dni w przyszłości — prawdopodobnie błędna.

Invoice issue date (P_1) is more than 60 days in the future — likely erroneous.

Evidence: P_1=2049-12-31

✗ FA_2026_02_0187.xml — FAIL

XSD: pass | Rules: 128 evaluated, 2 error(s), 1 warning(s)

[FAIL] KSEF-BUS-006 [GOV_MANDATED]

Problem: Faktura wystawiona w walucie obcej zawiera kwoty VAT, ale brakuje kursu przeliczeniowego (KursWaluty).

Foreign currency invoice has VAT amounts but the exchange rate (KursWaluty) is missing.

Evidence: KodWaluty=EUR

Source:Brochure FA(3), currency section, Art. 106e sec. 11

[WARN] KSEF-BUS-197 [HEURISTIC]

Evidence: P_1=2026-02-28 is Saturday

[FAIL] KSEF-BUS-302 [BATCH_CHECK]

Problem: Guard wykrył regresję daty wystawienia (P_1) w sekwencji numerów faktur.

Guard detected issue date regression in the invoice number sequence.

✓ FA_2026_03_0001.xml — PASS

XSD: pass | Rules: 128 evaluated, 0 error(s), 0 warning(s)

✗ FA_2026_03_0156.xml — FAIL

XSD: fail | Rules: 128 evaluated, 2 error(s), 0 warning(s)

[FAIL] KSEF-BUS-124 [INFERRED]

Problem: Numer NIP 999-999-99-99 ma nieprawidłowy format lub błędną sumę kontrolną.

NIP 999-999-99-99 has an invalid format or incorrect checksum.

Evidence: NIP=999-999-99-99

Source:Broszura FA(3), sekcja Formaty pól, pkt 10

[FAIL] KSEF-BUS-301 [GOV_MANDATED]

Problem: W partii faktur wykryto różne NIP-y sprzedawcy (Podmiot1).

Different seller NIPs (Podmiot1) detected across the invoice batch.

────────────────────────────────────────────────────────

Summary: 1 pass, 5 fail (6 files) in 285ms

Schema: FA(3) 1-0E | Registry: 1.0.0

JSON .\ksef-guard.exe validate --preset recommended --format json Documents\Invoices

{

"validator_version": "1.0.0",

"validation_timestamp": "2026-05-10T13:28:38Z",

"report_schema_version": "1.1",

"preset_name": "recommended",

"structural_pass": false,

"substantive_pass": false,

"rules_evaluated_count": 768,

"online_dependent_unchecked": [],

"triggered_rules": [

{

"rule_id": "KSEF-BUS-003",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-003_MISSING_P_14_1W",

"source_ref": "Broszura FA(3), Tabela 26 — P_14_1W..P_14_4W",

"quote_hash": "b55f2301d2557c1dbfd0de03f01fb9b3…",

"source_url": "https://ksef.podatki.gov.pl/media/…/broszura-fa-3.pdf",

"problem_pl": "Faktura wystawiona w walucie obcej nie zawiera pola P_14_1W…",

"problem_en": "Foreign currency invoice is missing the P_14_1W field…",

"fix_pl": "Otwórz fakturę walutową i uzupełnij pole P_14_1W…",

"fix_en": "Open the foreign currency invoice and fill P_14_1W…",

"quote_pl": "W przypadku, gdy faktura jest wystawiona w walucie obcej…",

"evidence_value": "KodWaluty=EUR",

"evidence_path": "/Faktura/Fa/P_14_1W",

"evidence_line": 41,

"evidence_type": "missing",

"correction_hint": "+ <P_14_1W>",

"legal_basis": [

{

"title_pl": "Kwota podatku wykazywana w złotych",

"title_en": "Tax amounts shown in PLN",

"excerpt_pl": "Kwoty podatku wykazuje się w złotych…",

"source": "Ustawa o VAT, Art. 106e ust. 11"

}

]

{

"rule_id": "KSEF-BUS-005",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-005_NO_PLN_TAX_PRESENTATION",

"evidence_value": "KodWaluty=EUR",

"evidence_path": "/Faktura/Fa/P_14_*W",

"evidence_line": 41,

"evidence_type": "missing",

"correction_hint": "+ <P_14_1W>..<P_14_4W>"

{

"rule_id": "KSEF-BUS-006",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-006_EXCHANGE_RATE_MISSING",

"evidence_value": "KodWaluty=EUR",

"evidence_path": "/Faktura/Fa/FaWiersz/KursWaluty",

"evidence_line": 40,

"evidence_type": "missing",

"correction_hint": "+ <KursWaluty>"

{

"rule_id": "KSEF-BUS-030",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-030_FUTURE_DATE",

"evidence_value": "P_1=2049-12-31",

"evidence_path": "/Faktura/Fa/P_1",

"evidence_line": 24,

"evidence_type": "value",

"correction_hint": "P_1 ≤ 2026-06-09"

{

"rule_id": "KSEF-BUS-044",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-044_LINE_ARITHMETIC_MISMATCH",

"evidence_value": "NrWierszaFa=2; P_8B=10.00; P_9A=50.00; P_11=0.00",

"evidence_path": "/Faktura/Fa/FaWiersz/P_11",

"evidence_line": 44,

"evidence_type": "value",

"correction_hint": "P_11 = 500.00"

{

"rule_id": "KSEF-BUS-114",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "KSEF-BUS-114_MISSING_PLN_CONVERSION|bucket=P_14_1W",

"evidence_value": "KodWaluty=EUR; bucket=P_14_1W",

"evidence_path": "/Faktura/Fa/P_14_*W",

"evidence_line": 41,

"evidence_type": "missing",

"correction_hint": "+ <P_14_xW>"

{

"rule_id": "KSEF-BUS-124",

"result": "FAIL",

"severity": "error",

"classification_tag": "INFERRED",

"reason_code": "KSEF-BUS-124_INVALID_NIP_FORMAT: 999-999-99-99",

"evidence_value": "NIP=999-999-99-99",

"evidence_path": "/Faktura/Podmiot1/DaneIdentyfikacyjne/NIP",

"evidence_line": 14,

"evidence_type": "value",

"correction_hint": "NIP: [0-9]{10}"

{

"rule_id": "KSEF-BUS-140",

"result": "FAIL",

"severity": "warning",

"classification_tag": "BEST_PRACTICE",

"reason_code": "KSEF-BUS-140_ZERO_VALUE_LINE",

"evidence_value": "line 2 P_11=0 with taxable rate P_12='23'",

"evidence_path": "/Faktura/Fa/FaWiersz/P_11",

"evidence_line": 44,

"evidence_type": "value",

"correction_hint": "P_11 > 0 ?"

{

"rule_id": "KSEF-BUS-168",

"result": "FAIL",

"severity": "warning",

"classification_tag": "HEURISTIC",

"reason_code": "KSEF-BUS-168_FAR_FUTURE_DATE",

"evidence_value": "P_1=2049-12-31",

"evidence_path": "/Faktura/Fa/P_1",

"evidence_line": 24,

"evidence_type": "value",

"correction_hint": "P_1 ≤ 2026-07-09"

{

"rule_id": "KSEF-BUS-197",

"result": "FAIL",

"severity": "warning",

"classification_tag": "HEURISTIC",

"reason_code": "KSEF-BUS-197_WEEKEND_ISSUE: P_1=2026-02-15 is Sunday",

"evidence_value": "P_1=2026-02-15 is Sunday",

"evidence_path": "/Faktura/Fa/P_1",

"evidence_line": 24,

"evidence_type": "value",

"correction_hint": "P_1 → weekday"

{

"rule_id": "KSEF-BUS-197",

"result": "FAIL",

"severity": "warning",

"classification_tag": "HEURISTIC",

"reason_code": "KSEF-BUS-197_WEEKEND_ISSUE: P_1=2026-02-28 is Saturday",

"evidence_value": "P_1=2026-02-28 is Saturday",

"evidence_path": "/Faktura/Fa/P_1",

"evidence_line": 24,

"evidence_type": "value",

"correction_hint": "P_1 → weekday"

{

"rule_id": "KSEF-BUS-301",

"result": "FAIL",

"severity": "error",

"classification_tag": "GOV_MANDATED",

"reason_code": "NIP_MISMATCH",

"evidence_value": "NIP='999-999-99-99' differs from majority '1111111111'",

"evidence_path": "/Faktura/Podmiot1/DaneIdentyfikacyjne/NIP"

{

"rule_id": "KSEF-BUS-302",

"result": "FAIL",

"severity": "error",

"classification_tag": "BATCH_CHECK",

"reason_code": "DATE_REGRESSION",

"evidence_value": "P_1 date regression in sequence 'FV/2026/02/'",

"evidence_path": "/Faktura/Fa/P_1"

}

"results": [

{

"filename": "FA_2026_01_0201.xml",

"structural_pass": true,

"substantive_pass": false,

"error_count": 1,

"warning_count": 1,

"xsd_error_count": 0

{

"filename": "FA_2026_02_0042.xml",

"structural_pass": true,

"substantive_pass": false,

"error_count": 3,

"warning_count": 1,

"xsd_error_count": 0

{

"filename": "FA_2026_02_0099.xml",

"structural_pass": true,

"substantive_pass": false,

"error_count": 1,

"warning_count": 1,

"xsd_error_count": 0

{

"filename": "FA_2026_02_0187.xml",

"structural_pass": true,

"substantive_pass": false,

"error_count": 2,

"warning_count": 1,

"xsd_error_count": 0

{

"filename": "FA_2026_03_0001.xml",

"structural_pass": true,

"substantive_pass": true,

"error_count": 0,

"warning_count": 0,

"xsd_error_count": 0

{

"filename": "FA_2026_03_0156.xml",

"structural_pass": false,

"substantive_pass": false,

"error_count": 2,

"warning_count": 0,

"xsd_error_count": 1

}

]

}

CSV .\ksef-guard.exe validate --preset recommended --format csv Documents\Invoices

file_name	file_status	risk_score	violation_type	code	severity	classification	problem_pl	problem_en	fix_pl	fix_en	evidence_xpath	evidence_value	source_ref	source_url	quote_pl	quote_en	page_number
FA_2026_01_0201.xml	FAIL	25	RULE	KSEF-BUS-044	error	GOV_MANDATED	Wartość netto wiersza (P_11 — kwota netto) nie odpowiada formule…	Line net value (P_11 — net amount) does not match the formula…	Sprawdź obliczenia na pozycjach faktury — wartość netto (P_11)…	Check the invoice line calculations — the net amount (P_11)…	/Faktura/Fa/FaWiersz	NrWierszaFa=2; P_8B=10.00; P_9A=50.00; P_11=0.00	Ustawa o VAT Art. 106e ust. 1 pkt 11	https://isap.sejm.gov.pl/…WDU20250000775	11) wartość dostarczonych towarów lub wykonanych usług…	11) Value of goods delivered or services provided…	124
FA_2026_01_0201.xml	FAIL	25	RULE	KSEF-BUS-140	warning	BEST_PRACTICE	Pozycja faktury ma zerową kwotę netto (P_11=0)…	Invoice line has zero net amount (P_11=0)…	Sprawdź tę pozycję — jeśli kwota netto…	Check this line — if the net amount…	/Faktura/Fa/FaWiersz/P_11	line 2 P_11=0 with taxable rate P_12='23'	Broszura FA(3), sekcja FaWiersz — P_11	https://ksef.podatki.gov.pl/…pdf#page=92	Wiersze faktury z zerową kwotą netto…	Invoice lines with zero net amount…	92
FA_2026_02_0042.xml	FAIL	65	RULE	KSEF-BUS-003	error	GOV_MANDATED	Faktura wystawiona w walucie obcej nie zawiera pola P_14_1W…	Foreign currency invoice is missing the P_14_1W…	Otwórz fakturę walutową i uzupełnij pole P_14_1W…	Open the foreign currency invoice and fill P_14_1W…	/Faktura/Fa/P_14_1W	KodWaluty=EUR	Broszura FA(3), Tabela 26 — P_14_1W..P_14_4W	https://ksef.podatki.gov.pl/…pdf#page=47	W przypadku, gdy faktura jest wystawiona w walucie obcej…	If the invoice is issued in a foreign currency…	47
FA_2026_02_0042.xml	FAIL	65	RULE	KSEF-BUS-005	error	GOV_MANDATED	Faktura walutowa zawiera kwoty VAT w walucie…	Foreign currency invoice has VAT amounts…	Otwórz fakturę walutową i dodaj przeliczenie…	Open the foreign currency invoice and add…	/Faktura/Fa/P_14_*W	KodWaluty=EUR	VAT Act, Art. 106e sec. 11	https://isap.sejm.gov.pl/…	11. Kwoty podatku wykazuje się w złotych…	11. Tax amounts shall be shown in Polish zlotys…	126
FA_2026_02_0042.xml	FAIL	65	RULE	KSEF-BUS-114	error	GOV_MANDATED	Faktura walutowa ma niezerowy VAT w koszyku stawki…	Foreign currency invoice has a non-zero VAT…	Uzupełnij brakujące pole P_14_xW przeliczeniem…	Fill in the missing P_14_xW field with the PLN…	/Faktura/Fa/P_14_*W	KodWaluty=EUR; bucket=P_14_1W	UoVAT, Art. 31a; FA(3) P_14_xW	https://isap.sejm.gov.pl/…	Dla waluty obcej każde pole P_14_xW…	For foreign currency invoices…	43
FA_2026_02_0042.xml	FAIL	65	RULE	KSEF-BUS-197	warning	HEURISTIC	Faktura ma datę wystawienia (P_1) w weekend…	Invoice has issue date (P_1) on a weekend…	Sprawdź datę wystawienia faktury…	Check the invoice issue date…	/Faktura/Fa/P_1	KSEF-BUS-197_WEEKEND_ISSUE: P_1=2026-02-15 is Sunday	KSeF Guard heuristic (weekend invoice issuance…	https://ksef.podatki.gov.pl/…pdf#page=43	Wystawienie faktury w weekend…	Invoice issuance on weekends…	43
FA_2026_02_0099.xml	FAIL	25	RULE	KSEF-BUS-030	error	GOV_MANDATED	Data wystawienia (P_1) jest w przyszłości…	Invoice issue date (P_1) is set in the future…	Sprawdź datę wystawienia — maks. 30 dni…	Check the issue date — max 30 days ahead…	/Faktura/Fa/P_1	P_1=2049-12-31	Art. 106na ust. 1 Ustawy o VAT (LOGICAL_INFERENCE)	https://ksef.podatki.gov.pl/…pdf#page=43	Faktury mogą być wystawiane…	Invoices may be issued no earlier…	43
FA_2026_02_0099.xml	FAIL	25	RULE	KSEF-BUS-168	warning	HEURISTIC	Data wystawienia (P_1) jest ponad 60 dni…	Invoice issue date (P_1) is more than 60 days…	Sprawdź rok i dzień daty wystawienia…	Verify the year and day are correct…	/Faktura/Fa/P_1	P_1=2049-12-31	UoVAT, Art. 106i ust. 7; Broszura FA(3) P_1, P_6	https://isap.sejm.gov.pl/…	Faktura może być wystawiona…	An invoice may be issued…	130
FA_2026_02_0187.xml	FAIL	25	RULE	KSEF-BUS-006	error	GOV_MANDATED	Faktura walutowa ma kwoty VAT, ale brak kursu…	Foreign currency invoice has VAT but exchange…	Uzupełnij kurs waluty (KursWaluty)…	Fill in the exchange rate (KursWaluty)…	/Faktura/Fa/FaWiersz/KursWaluty	KodWaluty=EUR	Brochure FA(3), currency section, Art. 106e sec. 11	https://ksef.podatki.gov.pl/…pdf#page=99	Kurs waluty stosowany do obliczenia…	The exchange rate used to…	99
FA_2026_02_0187.xml	FAIL	25	RULE	KSEF-BUS-197	warning	HEURISTIC	Faktura ma datę wystawienia (P_1) w weekend…	Invoice has issue date (P_1) on a weekend…	Sprawdź datę wystawienia faktury…	Check the invoice issue date…	/Faktura/Fa/P_1	KSEF-BUS-197_WEEKEND_ISSUE: P_1=2026-02-28 is Saturday	KSeF Guard heuristic (weekend invoice issuance…	https://ksef.podatki.gov.pl/…pdf#page=43	Wystawienie faktury w weekend…	Invoice issuance on weekends…	43
FA_2026_02_0187.xml	FAIL	25	RULE	KSEF-BUS-302	error	BATCH_CHECK	Data faktury (P_1) cofa się w sekwencji…	Invoice date (P_1) regresses within a sequential…	Sprawdź daty faktur w sekwencji numerów…	Check invoice dates in the sequential series…	/Faktura/Fa/P_1	P_2='FV/2026/02/0187' regresses from…	Art. 106e ust. 1 pkt 1 ustawy o VAT — data wystawienia	https://isap.sejm.gov.pl/…	Daty faktur (P_1) w ciągu numerów…	Invoice dates (P_1) must be…	43
FA_2026_03_0001.xml	PASS	0	-	-	-	-
FA_2026_03_0156.xml	FAIL	40	XSD	FA3-XSD-E001	error	-	NIP: tylko 10 cyfr (bez myślników)	NIP: 10 digits only (no dashes)	Wprowadź poprawny 10-cyfrowy NIP…	Enter a valid 10-digit NIP number…	{…}NIP	999-999-99-99	Schemat XSD FA(3), element: NIP
FA_2026_03_0156.xml	FAIL	40	RULE	KSEF-BUS-124	error	INFERRED	NIP 999-999-99-99 ma nieprawidłowy format…	NIP 999-999-99-99 has an invalid format…	Sprawdź numer NIP — 10 cyfr bez myślników…	Verify the NIP — 10 digits without dashes…	/Faktura/Podmiot1/…/NIP	NIP=999-999-99-99	Broszura FA(3), Page 6 — Formaty pol…	https://ksef.podatki.gov.pl/…pdf#page=6	Numer NIP powinien składać się…	NIP number should consist of…	6
FA_2026_03_0156.xml	FAIL	40	RULE	KSEF-BUS-301	error	GOV_MANDATED	NIP sprzedawcy różni się od NIP dominującego…	Seller NIP differs from the batch majority…	Sprawdź NIP sprzedawcy (Podmiot1/NIP)…	Check seller NIP (Podmiot1/NIP)…	/Faktura/Podmiot1/…/NIP	Seller NIP='999-999-99-99' differs from batch majority…	KSeF session single-taxpayer requirement	https://isap.sejm.gov.pl/…WDU20250000775	Wszystkie faktury w sesji KSeF…	All invoices submitted in a…	124

15 rows · 18 columns · UTF-8 BOM · Excel-compatible

Batch Operations

Process up to 5,000 files per day (Standard) or unlimited (Pro). Recursive folder scanning with cross-invoice rules: duplicate numbers, NIP inconsistencies, and chronological order issues. Free tier: 10 files/day.

ksef-guard validate ./invoices/

ksef-guard v1.0.0 (windows/amd64) | Preset: recommended | 128 rules

Plan: Standard | Limit: 5,000/day | Used: 4,213

787 / 787

────────────────────────────────────────────────────

⋮ (780 results above)

✓ FA_2026_Q1_0781.xml — PASS

✓ FA_2026_Q1_0782.xml — PASS

✗ FA_2026_Q1_0783.xml — FAIL

XSD: pass | Rules: 128 evaluated, 3 error(s), 0 warning(s)

[FAIL] KSEF-BUS-300 [GOV_MANDATED]

Problem: W partii faktur wykryto zduplikowany numer faktury (P_2)…

Duplicate invoice number (P_2) detected in the batch…

Fix: Sprawdź numerację faktur w partii — każda faktura musi mieć unikalny numer (P_2)…

Check the invoice numbering in the batch — each invoice must have a unique number…

Evidence: P_2="FV/2026/03/0214" (duplicate: FA_2026_Q1_0214.xml)

Path: /Faktura/Fa/P_2

[FAIL] KSEF-BUS-044 [GOV_MANDATED]

Problem: Wartość netto wiersza (P_11 — kwota netto) nie odpowiada formule…

Line net value (P_11 — net amount) does not match the formula…

[FAIL] KSEF-BUS-302 [BATCH_CHECK]

Problem: Regresja daty wystawienia (P_1) w sekwencji numerów faktur…

Issue date (P_1) regression in the invoice number sequence…

✓ FA_2026_Q1_0784.xml — PASS

✓ FA_2026_Q1_0785.xml — PASS

✓ FA_2026_Q1_0786.xml — PASS

✓ FA_2026_Q1_0787.xml — PASS

────────────────────────────────────────────────────

Summary: 782 pass, 5 fail (787 files) in 1,420ms

Schema: FA(3) 1-0E | Registry: 1.0.0

3 warnings | Risk avg: 1/100

✓ Compliance: Offline-verifiable subset checked.

Batch Stats

782 pass

5 fail

Pass rate: 99.4%

Configuration Profiles

Three built-in presets: essential (government-mandated rules only), recommended (balanced), and maximum (all rules, warnings promoted to errors). Override individual rules via .ksef-guard.yml (Pro).

Profil: Preset:

Podstawowy Essential Zalecany Recommended Maksymalny Maximum

Essential 71 rules

Only government-mandated rules. Legal minimum.

71 GOV_MANDATED only

GOV_MANDATED: on

BEST_PRACTICE: off

HEURISTIC: off

SECURITY: off

Recommended Default

All rules. Warnings noted, do not affect verdict.

128 rules

55% GOV · 20% BEST · 9% HEUR · 16% other

All categories: on

Warnings: show

Per-rule overrides

Active

Maximum 128 rules

All rules. Warnings treated as errors.

128 rules · all promoted to error

warning → error

Zero tolerance

Strictest compliance

.ksef-guard.yml | Shareable config for CLI & CI/CD

↑ Importuj Import ↓ Eksportuj Export

# Export from GUI: Settings → Rules → Eksportuj/Export
# Place in project root or ~/.config/ksef-guard/
# CLI auto-discovers: walks up from cwd → user config dir
preset: recommended # essential | recommended | maximum

rules: # per-rule: "error" | "warning" | "off"
KSEF-BUS-140: "off" # disable zero-amount heuristic
KSEF-BUS-193: "warning" # demote to warning
KSEF-BUS-044: "error" # enforce line arithmetic

5-Level Priority Chain — higher level always wins

Registry
defaults

lowest

.yml
preset:

file

.yml
rules:

overrides

CLI
--preset

flag

CLI
--disable-rule

highest

← lower priority

higher priority →

CI/CD Pipeline Integration

Single binary, zero dependencies — download, run, done. Ships with ready-made GitHub Actions and GitLab CI templates. Auto-discovers .ksef-guard.yml from your repo. Exit codes distinguish XSD failures from business rule violations.

ksef-validate.yml GitHub Actions

name: KSeF Validation
on: [push, pull_request]
jobs:
validate:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Download ksef-guard
run: |
curl -fsSL -o kg.tar.gz
ksefguard.pl/dl/linux-amd64.tar.gz
tar xzf kg.tar.gz
- name: Validate invoices
run: |
./ksef-guard validate
--preset maximum
--output results.txt
./invoices/
- uses: actions/upload-artifact@v4
if: always()
with:
name: ksef-results
path: results.txt

Validate invoices

exit code 2

$ ./ksef-guard validate --preset maximum --output results.txt ./invoices/

Validated: 2/2 files.

ksef-guard v1.0.0 | Preset: maximum | 128 rules

────────────────────────────────────────────────

✗ FA_2026_03_0042.xml — FAIL

XSD: pass | Rules: 128 evaluated, 3 error(s), 0 warning(s)

[FAIL] KSEF-BUS-044 [GOV_MANDATED]

Problem: Wartość netto wiersza (P_11) nie odpowiada...

Fix: ... | Evidence: ... | Path: .../FaWiersz/P_11

[FAIL] KSEF-BUS-110 [INFERRED]

Problem: Kwota netto wiersza przekracza ilość × cena...

Fix: ... | Evidence: ... | Path: .../FaWiersz/P_11

[FAIL] KSEF-BUS-177 [GOV_MANDATED]

Problem: Wartość brutto (P_11A) nie jest zgodna...

Fix: ... | Evidence: ... | Path: .../FaWiersz/P_11A

✓ FA_2026_03_0001.xml — PASS

XSD: pass | Rules: 128 evaluated, 0 error(s), 0 warning(s)

────────────────────────────────────────────────

Summary: 1 pass, 1 fail (2 files) in 109ms

Schema: FA(3) 1-0E | Registry: 1.0.0

Exit code: 2

ALL PASS

XSD FAIL

RULE FAIL

10–13

ARGS / IO

Single binary Zero dependencies Offline — no API calls .ksef-guard.yml auto-discovery

White-label PDF

PDF reports with your own logo and company header (Pro). KSeF Guard branding hidden — perfect for sharing with clients and auditors.

Default

PDF A4 · DejaVu Sans

KSeF Guard

Validation Report

Date: 2026-05-03

KSeF Guard

Walidator FA(3)

Files

PASS

FAIL

Rate

17%

FAILFA_2026_01_0201.xmlBUS-044

FAILFA_2026_02_0042.xmlBUS-044, BUS-110

FAILFA_2026_03_0088.xmlBUS-140

PASSFA_2026_03_0001.xml

... 2 more files

White-label PRO

PDF A4 · DejaVu Sans

Acme Księgowość Sp. z o.o.

Validation Report

Date: 2026-05-03

Acme

Księgowość

Files

PASS

FAIL

Rate

17%

FAILFA_2026_01_0201.xmlBUS-044

FAILFA_2026_02_0042.xmlBUS-044, BUS-110

FAILFA_2026_03_0088.xmlBUS-140

PASSFA_2026_03_0001.xml

... 2 more files

White-label PRO

PDF Export Settings

Logo firmy / Company logo

PNG, JPG · max 2 MB

acme-logo.png

Ukryj branding / Hide branding

Removes "KSeF Guard" from PDF footer

Nazwa firmy / Company name

Replaces "KSeF Guard" as report title

Acme Księgowość Sp. z o.o.

Session History

Automatic saving of validation results (all plans; Free keeps the last 5 sessions, Standard 25, Pro 100). Browse previous sessions, track pass rates and recurring violations, and restore full results with a single click.

KSeF Guard

Walidator FA(3)

FA(3) Validator

IDLE

Usage: 0/inf

Użycie:

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