Proving capital gains help

Start gathering as much documentation as humanly possible explaining the origin of the crypto. The Spanish tax authority is trying to understand whether you owe taxes for the manner by which the original 300,000 was generated.

Also, hire a Spanish tax lawyer/law firm that also understands crypto. Don't go at this alone.

jeffbean said:

Bump

--->

Sols said:

Start gathering as much documentation as humanly possible explaining the origin of the crypto. The Spanish tax authority is trying to understand whether you owe taxes for the manner by which the original 300,000 was generated.

Also, hire a Spanish tax lawyer/law firm that also understands crypto. Don't go at this alone.

jeffbean said:

The problem is proving the 300k some of it was won with gambling dice crypto games

If you can trace on the blockchain the path it took with exact addresses you might not need to actually have access to the wallets themselves. If you can't you better get as much documentation as you can possibly find (exchanger details, what time, date etc anything you can think of) and talk to a lawyer as it was initially suggested.

jeffbean said:

The problem is proving the 300k some of it was won with gambling dice crypto games

That's not a problem. You're just going to have pay taxes on it, unless the profits are from a gambling site whence profits are excluded from tax.

You chose to live in Spain. No one forced you. Alea iacta est, as they used to say.

As @gh0p said, start gathering as much as possible from the blockchain.

I'd be recommend thinking twice and thrice before trying to create some false source of wealth story whereby the funds you received were some sort of capital gains. A simple tax oopsie-doopsie is one thing. You'll have to pay up and maybe some late fees/interest. But if you create a false narrative and you get busted doing so, you've suddenly turned a mere tax mishap into money laundering and fraud. The difference is that one is measured in number of euros you pay in taxes, whereas the other is measured in number of years spent in jail (plus paying taxes).

It's not worth it. Just pay the man. And if you don't like Spanish tax, there is a really easy solution going forward: stop living in Spain.

You got pretty decent answer here from two competitive people and yet you are not satisfied. You won't find miracles but you will find useful information here that can help you to keep out of troubles with the Spanish tax man who will spank you if you try to fool them.