Here are four ways you may have 'accidentally' committed tax fraud...
1. You forgot to report all of your income. You're still supposed to report ALL income. Which also includes money from investments, rental properties, and gambling.
2. You stretched the truth on your business expenses, like deducting the entire cost of your car or your phone, even though you also use them when you're not working. In cases like that, you're only supposed to deduct a percentage. Otherwise, it's tax fraud.
3. You inflated the value of your deductions. Line items like medical expenses, or work-related education expenses.
4. You overvalued your non-cash donations, like that old box of crap you gave to Goodwill, then claimed it was worth $500. That's technically tax fraud.