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
Filing deadline for corporate tax returns extended by one month
Laid off from work – ask for a revised tax card
Instructions: How to request a payment arrangement in MyTax
Due date 5 May, 12 May or 19 May
How to make corrections to a pre-completed tax return in MyTax
Claim certain deductions yourself
The due date for corporate entities is 3 April
The due date for individual taxpayers is 5 May
How to submit and correct real estate details in MyTax
Where can I find a tax card or decision in MyTax?
How to request adjustment of prepayment?
I have filed my tax return but I can’t see it in MyTax. Why?
Does MyTax automatically save the information I enter?