Usually, tax crimes come in the form of intentionally acting in a way to avoid paying your taxes. This may include false information in your returns, under-reporting income, or not reporting any specific source of income. It also covers inflating legitimate deductions or falsifying one or more deductions completely. It is also a tax crime to assist someone in any of these scenarios – either in their filing or in creating false documents to cover for the fraud.  Finally, it is a crime to not file your tax returns for three consecutive years where there is a tax liability.