Both forms tell the tax authority that a person received money, but they describe fundamentally different arrangements. The difference determines who has already remitted tax and who still has to.
One reports an employment relationship
A W-2 documents wages paid by an employer to an employee. Alongside the gross figure it reports the amounts already withheld for federal income tax and payroll taxes.
Because withholding has happened, the recipient's filing largely reconciles what was withheld against what was owed. The employer has done the remitting throughout the year.
The form also carries entries for retirement plan contributions, health coverage and other payroll deductions, which is why it is longer and more structured than the alternatives.
The other reports a payment, not a relationship
The 1099 family reports payments made to someone who is not an employee. Different variants cover contract work, interest, dividends, brokerage proceeds and several other categories.
These forms generally report a gross amount with nothing withheld. The payer's obligation ends at reporting; the recipient carries the remitting duty.
That single structural fact produces most of the surprise for people moving from employment into contract work, since the same headline figure now has tax still attached to it.
Reporting thresholds create gaps
Payers are required to issue these forms above certain amounts, and the thresholds differ by form type and change over time. Below a threshold, no form is issued.
An unissued form does not make the income unreportable. The obligation attaches to the income itself, not to whether a document arrived describing it.
The practical consequence is that anyone with several small payers has to track income from their own records, because the forms arriving in the mail may not add up to the total.
Why amounts often disagree with bank records
A brokerage form may report gross proceeds from sales rather than the net amount deposited. A payment platform may report the gross before its fees were deducted.
Deposits into a checking account are therefore routinely smaller than the figure reported to the authority, and the difference has to be documented rather than assumed away.
Reconciling the two is the reason contractors keep fee and expense records separately rather than relying on a bank feed, which shows only what actually landed.
Corrections arrive after filing season starts
Payers can issue corrected versions, and brokerages in particular often revise forms after initial distribution as underlying information settles.
A return filed against an original form and later contradicted by a corrected one creates a mismatch the authority may query. Waiting for finalized documents avoids some of that.
How to handle a correction that arrives after filing depends on its size and type, and it is a situation where professional guidance is worth more than a general rule.