e-Filing guidance

The guidance articles below contain descriptions of the returns you can send us via www.ilmoitin.fi. The format, the automatic checks, and the submittal to the Tax Admininstration are discussed. 

Electronic filing of information returns General description (pdf) (17 November 2021)

Making corrections to electronically filed annual information returns

The control character for verifying the authenticity of finnish Business IDS and Personal identity codes (pdf)