I'm not sure what the tax code is like in other countries, but the US one is pretty complicated due the number of write-offs you can add to your tax deductions.

I'm not sure what the tax code is like in other countries, but the US one is pretty complicated due the number of write-offs you can add to your tax deductions. A lot of those deductions are not reported to the government, so it's up to you to figure out if its worth doing or just doing the standard deduction amount.