There are mainly 9 types of tax audit trigger: 1) When you earn a lot of money, consider it a tax audit trigger. No matter how much tax you pay, there will always be a chance that your financial reports might be audited. 2) If you are claiming itemized deductions that are disproportionate to your income. 3) If you own a cash business like a salon, taxi services, car wash, and restaurant, you are more likely to get audited. 4) Being self-employed is also a tax audit trigger. 5) If you failed to report your taxable income, get ready for a tax audit soon. 6) If you show losses in your business for three consecutive years and still choose to stay actively engaged in the same business, it is considered as another tax audit trigger. 7) If you claim your vehicle as 100% business use, you can expect a tax audit. 8) If you have assets or cash in another country, it may trigger a tax audit. 9) Having investment income is also sometimes considered a tax audit trigger.