Bribes. If you receive a bribe, include it in your income.
Illegal income. Illegal income, such as money from dealing illegal drugs, must be included in your income on Form 1040, line 21, or on Schedule C or Schedule C-EZ (Form 1040) if from your self-employment activity.
Kickbacks. You must include kickbacks, side commissions, push money or similar payments you receive in your income on Form 1040, line 21, or on Schedule C or Schedule C-EZ (Form 1040), if from your self-employment activity.
Example: You sell cars and help arrange car insurance for buyers. Insurance brokers pay back part of their commissions to you for referring customers to them. You must include the kickbacks in your income.
Stolen property. If you steal property, you must report its fair market value in your income in the year you steal it unless, in the same year, you return it to its rightful owner. Personally, I?d report it as "miscellaneous" income rather than "stolen property."