By 31 January 2025, digital platform operators across the EU must file their second annual DAC7 report, covering sellers active in 2024. The first cycle, in January 2024, taught the market an expensive lesson: the single most common cause of rejected records was not missing sellers or misclassified income. It was invalid tax identification numbers.
A TIN that looks right can still be wrong
Every jurisdiction structures its TINs differently, most include checksum digits, and sellers mistype them, invent them, or paste the wrong country's format. A platform that only checks "field not empty" discovers the damage twelve months later, when the tax authority bounces thousands of records and the re-documentation cycle begins during the busiest week of the year.
Validate at intake, not at filing
The fix is structural: validate syntax and checksum the moment a seller onboards, confirm against a live register where one exists (such as EU VIES for VAT numbers), and store the evidence record next to the seller profile. January then becomes an export job instead of a fire drill.
WeVerify's TIN Verification runs exactly this: worldwide syntax and checksum rules, registry confirmation where available, batch validation for existing seller bases, €0.30 per check. Combined with KYC and KYB, the same flow also covers DAC7's due-diligence duties.