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Tax return 2020 :

Form 100 :

Tax Administration asks you to send in your return by 31 March 2022.

But if you send it after 31 March, it should in principle be accepted.

However, if you file your tax return late (i.e. after 31 March), it is possible that the processing time for your tax return will be longer.

Non-resident taxpayers, married before January 1 of the tax year, who wish to change their tax class are obliged to send their return before March 31, otherwise they will automatically be taxed in tax class 1.

Form 163 :

The deadline is 31 December and in principle the Tax Authorities does not accept forms after that date.
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