OmaVero

OmaVero is the Finnish Tax Administration's (Verohallinto) digital tax portal. It's the primary platform where Finnish residents file their annual tax return, view pre-filled tax data, report additional income, and manage tax decisions.

Reporting prediction market income

Finnish banks and brokers automatically report investment income to Verohallinto, which pre-fills your tax return. However, international prediction market platforms (Kalshi, Polymarket) do not report to Finnish authorities — you must manually add this income in OmaVero.

Key steps for prediction market traders

1. Log in to OmaVero with Finnish bank ID or mobile certificate
2. Navigate to "Additional income" (Lisätulot)
3. Determine if gains are pääomatulo (capital income at 30/34%) or ansiotulo (earned income at progressive rates)
4. Enter the net gain or loss with a description of the income source
5. Submit before the filing deadline (typically early May)

Deadline

Individual tax returns in Finland are due in April or May, depending on your assigned filing date. OmaVero sends reminders and displays your specific deadline.

Currency conversion

Since prediction market platforms operate in USD, you must convert gains to EUR for Finnish tax reporting. Use the ECB reference rate on the transaction date, or alternatively the annual average rate if consistent throughout. OmaVero does not automatically convert foreign currency amounts — you must calculate and enter EUR values.

Frequently asked questions

Will Verohallinto pre-fill my prediction market income?

No. International prediction market platforms do not report to Finnish authorities. You must manually add this income. Verohallinto may receive information through CRS (Common Reporting Standard) exchanges in the future, so accurate self-reporting is essential.

What documentation should I keep?

Maintain detailed records of every trade: dates, amounts in USD and EUR, platform used, and market descriptions. Keep these for at least 6 years — the standard retention period for Finnish tax documentation.