Additionally, being involved in illegal activities doesn't excuse someone from having to file a federal income tax return. Income earned from illegal actions must be reported and is taxable under federal law. $$It would be an extreme if not an extravagant application of the Fifth Amendment to say that it authorized a man to refuse to state the amount of his income because it had been made in crime.$($U$.$S$.$ v$.$ Sullivan, $1927)$ In conclusion, failing to report income is illegal and will result in tax evasion charges. It does not matter where you got it from, the fact that it came from illegal activities is separate, and it is not a violation of the Fifth Amendment.