If you're employed then you don't have to do any form filling at all. It's responsibility of your employer to pay all the taxes and you only get the amount after taxes in your bank account. Typically accountants do all the computing.

There is an exception, self-employed people. They do have to fill in forms and compute everything but their taxes are flat, there is no non-taxable minimum. They have less total tax % but also less perks (no paid vacations or sick days etc)

Update: no, we don't have to declare foreign bank accounts afaik. It might change this year because they just started taxing income from capital gains which will cause some headache for me personally.