Form 1099-K comes from a payment settlement entity: Venmo, PayPal, Cash App, Square, Stripe, and the marketplaces that process payments for sellers, such as Etsy, eBay, Amazon, Poshmark, StubHub, Uber and DoorDash. If a company stands between a buyer and you and settles the payment, it files the form. One copy goes to you and one to the IRS.
The number on the form is gross: every dollar that came through for goods and services, before the platform’s fees, refunds you gave, shipping, and the cost of whatever you sold. Nothing on a 1099-K is profit. It is a count of money in.
The IRS computer matches the form against your return. If $23,000 of gross payments is reported under your Social Security number and your return shows nothing, a notice follows a year or more later proposing tax on the whole $23,000. The answer is to report what the form represents, with the expenses and basis that turn gross receipts into actual income.
Behind the scenes
Before we touch the total on a 1099-K, we read the month-by-month breakdown on the form. Twelve roughly equal monthly amounts are usually a roommate’s rent or a family member paying back a loan. Uneven amounts peaking in November and December are usually a seller. The form doesn’t say which; the pattern does, and it tells us what to ask before anything goes on Schedule C.