Internal Revenue Service guidelines explicitly require US taxpayers to declare income generated from bribes, theft, and illegal drug sales on their annual tax returns.

Tax law measures income, not its legality

The tax system asks whether a person received an economic benefit—not whether the way they got it was lawful. A bribe paid in cash and money earned from illegal sales can therefore count as income under the same basic principle as wages or business receipts: the recipient has gained something of measurable value.

That rule keeps illegal earnings from receiving a tax advantage that lawful earnings do not. If criminal proceeds were automatically excluded, two people with the same financial gain could face different tax treatment solely because one obtained it through a crime.

Why stolen goods need a value

Not all gains arrive as cash. Someone who steals property has received something that can be sold or used, so the tax rules treat the property’s fair market value—roughly, what it would ordinarily sell for—as the relevant amount. If the property is returned to its owner within that same tax year, the stated rule does not require reporting that value as income.

This is a way to translate a noncash benefit into a dollar figure for tax purposes. It does not mean the thief owns the goods legally or may keep them; tax accounting and ownership law answer different questions.

A tax return is not a pardon

Reporting illicit income does not make the underlying conduct lawful or shield someone from criminal consequences. It addresses a separate obligation: accounting for economic gains under tax law. The distinction can be uncomfortable, but it reflects how the tax system is designed to assess what a person received, even when another part of the law may punish how they obtained it.