I recently sold the apartment that I had owned for investment purposes. When should I submit a report to the Tax Administration?

You can inform the Tax Administration of the sales transaction as soon as the contract is finalised. After that, you can take care of the ensuing capital-gains tax in advance, by making a prepayment or by requesting a new tax card to raise the withholding percentage rate on your wage income.

If you choose not to inform the Tax Administration of the sales transaction, you can wait until your pre-completed tax return arrives next spring and check its contents. If it turns out that the pre-completed tax return does not contain information on the apartment you sold, you must add the information to it. The result will be that you end up paying your capital-gains tax in the form of back taxes.