Businesses and corporations

Value added tax

If your company is in the VAT register, remember to file VAT returns regularly even if you have not had any business activities. 

Tax prepayment

The amount of the current year's total prepayments is based on an estimate of taxable profits. If your income or expenses do not match the estimate you had made, you can request an adjustment of your prepayment in MyTax.

Katso identification system is now withdrawn

You can no longer use your Katso ID and Katso authorisations starting 1 September 2021.

If you are currently using Katso authorisations to take care of someone else’s tax matters, you must request new authorisations instead. Your Katso authorisations will not be automatically replaced with authorisations. 

Important Dates and Deadlines

23.9. Due date for prepayments of income tax
30.9. The income tax return of corporate taxpayers
12.10. Due date for VAT and other self-assessed taxes

Payment arrangement

If you have temporary financial difficulties and you need more time for paying your taxes, you can ask for a payment arrangement.

Request a payment arrangement in MyTax. You will get your decision faster in MyTax than by calling.

Business in Finland

Are you bringing your business operations to Finland? Your tax liabilities in Finland will depend on your company type and the scope of your operations.