The obligation to declare and pay tax are different. If you close the year with more than 5k in custody, no matter whether national or international, you have to declare that you have the crypto

Here are some valuable tips to help you save on your 2025 Income Tax Return.
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In Brazil, tax evasion is a crime, so using cryptos for this would obviously give you a problem, so don't do it.
But if you want to pay less taxes or even zero reais and not have all the regular operations, write it down:
1 - I would try my best to negotiate in my job or work the possibility of receiving my salary through a company, to get away from the CLT and high taxes.