Question regarding Income Tax Filling


My name is Alvaro and I'm new in this forum.

I live in the Czech Republic for 3 years already and I'm trying to fill my income tax declaration form for 2019

I've done that already, and in the previous years I've received some money back.

But this year I'm being told, after filling everything, that I have to pay something like 84.000 crowns.

Has something changed in the law during the last year? My income was still exactly the same as from previous years and I worked as an employee (not freelancing) in the same company, same job.

Thank you.

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