Impossible to be certain what is legal about taxes

The tax laws are described as not transparent or well-written, making it tough to figure out what's truly legal and what isn't. There's too much gray area.

Different parts of Hacienda, or even different employees, can have different interpretations of the same rule.

If you call Hacienda for help, you'll likely get different, non-binding answers. Following the advice of one technician could still lead to penalties if an inspector sees things differently.

It's so muddled that even professional tax advisors aren't always completely certain about how things should be interpreted in some situations.

If something goes wrong and you get accuse by Hacienda, unlike typical judicial processes, when litigating against Hacienda, the taxpayer must prove their innocence, rather than Hacienda having to prove guilt. There is no guaranteed presumption of innocence.

What makes it even worse is that the inspectors get payed a bonus for increasing the income from IRPF, with money collected from the taxpayers they are destroying.

In other words, even if you pay all your taxes correctly, you can still be treated like a criminal.