KSeF FA(3) — correcting invoice (faktura korygująca, KOR)
A correcting invoice (RodzajFaktury = KOR), the FA(3) case people look for most and get wrong most. Its totals carry the DELTA, not the restated invoice — P_13_1, P_14_1 and P_15 are all negative — and PrzyczynaKorekty, TypKorekty and DaneFaKorygowanej appear, pointing back at the invoice being corrected. The lines come in pairs: the one with StanPrzed is the state before.
FA(3) 1-0E — Valid
A correcting invoice (RodzajFaktury = KOR), the FA(3) case people look for most and get wrong most. Its totals carry the DELTA, not the restated invoice — P_13_1, P_14_1 and P_15 are all negative — and PrzyczynaKorekty, TypKorekty and DaneFaKorygowanej appear, pointing back at the invoice being corrected. The lines come in pairs: the one with StanPrzed is the state before.
What this file shows
A correcting invoice (RodzajFaktury = KOR), the FA(3) case people look for most and get wrong most. Its totals carry the DELTA, not the restated invoice — P_13_1, P_14_1 and P_15 are all negative — and PrzyczynaKorekty, TypKorekty and DaneFaKorygowanej appear, pointing back at the invoice being corrected. The lines come in pairs: the one with StanPrzed is the state before.
| Transactions | 2 |
|---|---|
| Total | -PLN 369.00 |
| Date in the file | 2026-07-10 |
Every party, IBAN and amount below is fictitious. The IBANs are structurally valid — they pass the mod-97 check — but they belong to no real account.
File content
<?xml version="1.0" encoding="UTF-8"?>
<!--
KSeF FA(3) — CORRECTING INVOICE (faktura korygująca, RodzajFaktury = KOR).
This is the shape a correction takes in FA(3), and it surprises people:
· the totals carry the DELTA, not the restated invoice — P_13_1 (-300.00),
P_14_1 (-69.00) and P_15 (-369.00) are all negative, because the correction
lowers what was already invoiced;
· <PrzyczynaKorekty> (the reason) and <TypKorekty> are mandatory here and appear
nowhere on a plain VAT invoice;
· <DaneFaKorygowanej> points back at the invoice being corrected — its date, its
number and, when it went through KSeF, its KSeF number;
· the lines come in PAIRS: the one carrying <StanPrzed>1</StanPrzed> is the state
BEFORE the correction, the one without it is the state after.
ValidateFin's line-total check (Σ P_11 vs P_13_*) deliberately does NOT run on KOR —
the lines restate values while the totals carry the delta, so they cannot agree.
-->
<Faktura xmlns:etd="http://crd.gov.pl/xml/schematy/dziedzinowe/mf/2022/01/05/eD/DefinicjeTypy/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://crd.gov.pl/wzor/2025/06/25/13775/">
<Naglowek>
<KodFormularza kodSystemowy="FA (3)" wersjaSchemy="1-0E">FA</KodFormularza>
<WariantFormularza>3</WariantFormularza>
<DataWytworzeniaFa>2026-07-12T10:15:00Z</DataWytworzeniaFa>
<SystemInfo>ValidateFin</SystemInfo>
</Naglowek>
<Podmiot1>
<DaneIdentyfikacyjne>
<NIP>9999999999</NIP>
<Nazwa>Zimnotech AGD sp. z o.o.</Nazwa>
</DaneIdentyfikacyjne>
<Adres>
<KodKraju>PL</KodKraju>
<AdresL1>ul. Kwiatowa 1 m. 2</AdresL1>
<AdresL2>00-001 Warszawa</AdresL2>
</Adres>
<DaneKontaktowe>
<Email>[email protected]</Email>
<Telefon>221234567</Telefon>
</DaneKontaktowe>
</Podmiot1>
<Podmiot2>
<DaneIdentyfikacyjne>
<NIP>1111111111</NIP>
<Nazwa>F.H.U. Jan Kowalski</Nazwa>
</DaneIdentyfikacyjne>
<Adres>
<KodKraju>PL</KodKraju>
<AdresL1>ul. Polna 7</AdresL1>
<AdresL2>30-001 Kraków</AdresL2>
</Adres>
<JST>2</JST>
<GV>2</GV>
</Podmiot2>
<Fa>
<KodWaluty>PLN</KodWaluty>
<P_1>2026-07-10</P_1>
<P_1M>Warszawa</P_1M>
<P_2>FK/2026/07/031</P_2>
<P_6>2026-06-18</P_6>
<P_13_1>-300.00</P_13_1>
<P_14_1>-69.00</P_14_1>
<P_15>-369.00</P_15>
<Adnotacje>
<P_16>2</P_16>
<P_17>2</P_17>
<P_18>2</P_18>
<P_18A>2</P_18A>
<Zwolnienie>
<P_19N>1</P_19N>
</Zwolnienie>
<NoweSrodkiTransportu>
<P_22N>1</P_22N>
</NoweSrodkiTransportu>
<P_23>2</P_23>
<PMarzy>
<P_PMarzyN>1</P_PMarzyN>
</PMarzy>
</Adnotacje>
<RodzajFaktury>KOR</RodzajFaktury>
<PrzyczynaKorekty>obniżka ceny o 300 zł netto z uwagi na uszkodzenia estetyczne obudowy</PrzyczynaKorekty>
<TypKorekty>3</TypKorekty>
<DaneFaKorygowanej>
<DataWystFaKorygowanej>2026-06-18</DataWystFaKorygowanej>
<NrFaKorygowanej>FV/2026/06/214</NrFaKorygowanej>
<NrKSeF>1</NrKSeF>
<NrKSeFFaKorygowanej>9999999999-20260618-8BEF280C8D35-4D</NrKSeFFaKorygowanej>
</DaneFaKorygowanej>
<FaWiersz>
<NrWierszaFa>1</NrWierszaFa>
<UU_ID>aaaa111133337770</UU_ID>
<P_7>lodówka Zimnotech mk3</P_7>
<P_8A>szt.</P_8A>
<P_8B>1</P_8B>
<P_9A>2600.00</P_9A>
<P_11>2600.00</P_11>
<P_12>23</P_12>
<StanPrzed>1</StanPrzed>
</FaWiersz>
<FaWiersz>
<NrWierszaFa>1</NrWierszaFa>
<UU_ID>aaaa111133337770</UU_ID>
<P_7>lodówka Zimnotech mk3</P_7>
<P_8A>szt.</P_8A>
<P_8B>1</P_8B>
<P_9A>2300.00</P_9A>
<P_11>2300.00</P_11>
<P_12>23</P_12>
</FaWiersz>
</Fa>
<Stopka>
<Informacje>
<StopkaFaktury>Kapitał zakładowy 500 000 zł</StopkaFaktury>
</Informacje>
<Rejestry>
<KRS>0000099999</KRS>
<REGON>999999999</REGON>
</Rejestry>
</Stopka>
</Faktura>
How we know these results hold
Every file in this library is run through the site's own validator on each build. The expected result stated above is asserted by an automated test — if a file stopped matching what this page claims, the build would fail. Two inherited fixtures were repaired this way before publication: three IBANs failed the mod-97 check and several names used characters outside the basic SEPA character set.
KSeF invoice (Poland, FA(3))
- KSeF FA(3) — valid invoice (official MF example)
- KSeF — invoice still using the retired FA(2) schema
- KSeF FA(3) — bad NIP check digit and mismatched total (warnings only)
- KSeF FA(3) — prepayment invoice (faktura zaliczkowa, ZAL)
- KSeF FA(3) — mandatory element missing (rejected by the official XSD)
- KSeF FA(3) — buyer NIP failing its mod-11 check digit (warning only)