What is Form 1099?
The 1099 is a whole family of forms that report income you received that isn't wages — contractor pay, interest, dividends, retirement distributions, and more.
How it works
Whoever paid you files the matching 1099 with the IRS and sends you a copy. Each variant has a letter code (NEC, MISC, INT, DIV, K) for the type of income. Because the IRS already has its copy, anything on a 1099 needs to show up on your return or you'll likely get a notice.
A quick example
What people get wrong
Not getting a 1099 doesn't make income tax-free. If a client paid you $400 but never sent a form, you still owe tax on it — the reporting threshold is the payer's obligation, not your excuse.