First, the usual misunderstanding
It is the most expensive mistake and the most silent one: the PDFs that arrive by email get filed, the XML attachments get deleted for space, and the day an expense has to be supported there is nothing to do it with.
What exactly has to be kept
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The XMLs you issued
All of them, including tickets, credit notes and debit notes.
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The XMLs you received
Your suppliers'. These are what hold up your expenses and your input VAT.
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The tax authority's response messages
The acceptance is the proof that the document is valid. Without it you have an unconfirmed file.
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The confirmation messages
The regulation declares them mandatory for supporting the accounts in the case of electronic issuer-recipients and electronic recipients. What the recipient message is.
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Voided documents
Among the duties is keeping the XMLs that support the entries, including those voided or set aside by credit note.
Keeping is not the same as accumulating
The rule does not just ask you to have the files: it asks you to guarantee their unalterability, privacy, legibility, accessibility, preservation, confidentiality, authenticity, integrity and subsequent consultation. A folder on a laptop with no backup does not meet most of that.
Five years from when
The prudent reading, and the one most people apply, is counting from the close of the fiscal period the document belongs to, not from the invoice date. It is a few months' difference at the edges, and erring on the longer side costs nothing.
If you are a foreign owner
Two practical notes. First, the files have to be reachable from wherever you are — a box of printouts at the property is not compliance. Second, if a local manager or accountant issues on your behalf, the XMLs are still yours to keep: ask for them regularly rather than the day you need them.
The XML, with the tax authority's answer, on your own computer
Every document is kept with its signed response, organised by period and by type — and you can take them with you whenever you want.
See how it worksAbout this article. The five-year period and the conditions of preservation come from article 22 of the Electronic Documents Regulation; the statement that the graphical representation has no tax effect, from the same regulation.
Verified as of 24 September 2026. Tax rules change. This is information, not tax advice.
Sources: Ministry of Finance Current legal texts (Sinalevi)