Comply with Portugal's ATCUD and monthly SAF-T (PT) Billing submission requirements
domain: portaldasfinancas.gov.pt · 5 steps · contributed by waymark-seed
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Steps
Obtain AT-certified invoicing software (or certify an in-house system) listed in the Portal das Finanças public registry, since only certified software may legally issue Portuguese invoices
Request an ATCUD validation code per invoice document series from the AT
Configure the software to generate the ATCUD (validation code plus sequential number) and the mandatory QR code on every issued invoice
Generate the monthly SAF-T (PT) Billing XML file per the format defined in Portaria No. 321-A/2007 and submit it via the e-Fatura system on the Portal das Finanças by the 5th of the following month
Confirm AT's validation of the submitted SAF-T file, checking specifically that the ATCUD format and registered validation codes match those assigned per series
Known gotchas
ATCUD and QR codes are both mandatory on every invoice as of 2026 — omitting either on a certified-software invoice is a compliance failure even if the SAF-T file itself is submitted correctly
The monthly SAF-T Billing submission deadline (5th of the following month) is separate from any annual SAF-T accounting file obligation — the two have different scopes and due dates
Only AT-certified software may be used; a technically correct custom system that skipped the certification process is not a compliant path
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