New version of Ilmoitin.fi to be launched 3 February 2026

From 7 am to 9 am on 3 February 2026, service is down and both the www.ilmoitin.fi website and its software interfaces are temporarily unavailable.

Key changes:

• Ilmoitin.fi accepts income tax returns for corporate taxpayers´ 2025 accounting periods. Users can both check and submit returns (Forms 4, 6, 6B, 6C and 6U).
  • In addition to the annual changes, there have been other changes to the following data format specifications: 4, 6, 6B, 62, 71A, 71B, 8A.
  • Data format specifications are available on vero.fi.
• Rental income - farmlands, woodlands, forest and other rental property (7L).
  • You can check and submit self-employed businesses´ income tax returns 7L for tax year 2025.
• Opening the Archive page.
  • When navigating to the page, the sending information of files sent via the ApitamoPKI interface is not retrieved.
  • The metadata of files sent via the ApitamoPKI interface can be viewed by searching for the customer ID.
  • This only applies to companies to which files are sent via both the www.Ilmoitin.fi service and the ApitamoPKI interface.
• The data format specifications for annual information returns for the 2026 reporting year are published on 3 February, but their formats will not be available until the March version of Ilmoitin.fi is launched on 24 March 2026. The specifications are available on vero.fi.
• Application for refund of tax withheld and application for tax-at-source cards (WHT ja TAS).
  • Fixed MessageRefId check and spaces are no longer allowed.
  • Removed OBAN bank account check.
• FATCA annual return has been removed from comments if the Individual/TIN is 000000000 or AAAAAAAAA and the IssuedBy attribute is not provided or its value is US.
• Test environment testi.ilmoitin.fi
  • submitted files will be cleaned up once a day in the future, so old files will open empty in the Archive. This change will be implemented in the coming months.