Depends on how much anonymity and security you want. If you work within channels that your country's tax authority can audit (like direct bank transfers, apps l

Depends on how much anonymity and security you want. If you work within channels that your country's tax authority can audit (like direct bank transfers, apps like Venmo or gift cards etc), then you can always be caught. Of course, there are degrees of anonymity and security associated with different instruments and you will have to find the one that works for you. I guess the most anonymous and secure payment method would be to work anonymously for a cryptocurrency (i.e. a job that doesn't require you to give your personal information), and then use that to pay for your illegal goods. Of course, you have to ensure that your illegal goods supplier does not know your personal information either, so they don't accidentally anonymize you.