Nothing is withheld. Every dollar arrives gross. Income tax and self-employment tax (Social Security + Medicare, currently 15.3% on net self-employment earnings) are yours to pay.
Form 1099-NEC goes to you and the IRS each January if we paid you $600 or more during the calendar year. Under $600 we do not file one — but the income is still taxable and still yours to report.
Because nothing is withheld, the IRS generally expects quarterly estimated payments (Form 1040-ES) once you expect to owe $1,000 or more for the year. Many partners set aside 25–30% of each payout for this. Your state may expect estimates too.
Your ledger is a permanent record of every accrual and payout — export it at tax time.
This is general information, not tax advice. Talk to a tax professional about your situation. More detail at /partners/tax.
The partner help centre covers attribution, the ledger, payouts and the selling rules.