MyTax is the Tax Administration’s e-service for most of your tax matters. You can log in with your online banking codes, a mobile certificate, or a Katso ID. If you wish to act on behalf of someone else, you will need authorisation.
How to make a tax card
How to file a tax return - corporate taxpayer
MyTax instructions for individual and corporate taxpayers
What tax returns for 2019 can be filed in MyTax?
Where do I find the tax return for forestry, agricultural operations or business in MyTax?
How to request adjustment of prepayment?
What does it mean that my tax refund is used for paying my taxes?
I paid a tax on the due date, but a message appears in MyTax saying that the tax is still not paid. Why?