- Tax law provisions imposing public law obligations on taxpayers do not change the content of civil contracts. Structured invoices required by tax law (like those via KSeF) are public law documents and do not have civil law effects unless the contract explicitly gives them such a role. Tax obligations, such as issuing invoices, do not alter the terms of agreements between parties; they only fulfill tax requirements. In Poland, although VAT invoices are often used as commercial documents, their legal effect on contracts depends on the parties’ agreement, not on tax law itself.
Source: ksiegowosc.infor.pl
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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