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Finland: Updated FATCA and CRS technical guidance

New Ilmoitin validation rules for account numbers, TINs, name types, and nationality reporting.

July 7, 2026

Finland’s tax administration updated its FATCA technical guidance (v3.6), including:

  • Section 7, “List of Automated Checks Made by Ilmoitin,” now includes new validation processes:
    • AccountReport/AccountNumber/@AcctNumberType: If AcctNumberType is OECD601, the account number must be in IBAN format; if OECD603, it must be in ISIN format.
    • AccountHolder/Individual/TIN and SubstantialOwner/Individual/TIN: If an FTIN is reported, the corresponding U.S. TIN must also be provided.

It also updated its CRS technical guidance (v3.2), adding:

  • Section 7, “Checks Made by Ilmoitin.fi,” now includes several validation enhancements:
    • //Name/@nameType: The optional nameType field may now only use OECD207.
    • AccountHolder/Individual/TIN and ControllingPerson/Individual/TIN: The TIN element is limited to 100 characters.
    • ControllingPerson/Individual/Nationality and AccountHolder/Individual/Nationality: The Nationality element is prohibited.

Read a July 2026 report prepared by the KPMG member firm in Finland

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