Tax Basics for Affiliate Marketing Income (US)
Affiliate income is self-employment income: Schedule C, 15.3% self-employment tax, quarterly estimates, and the 2026 changes to 1099-K and 1099-NEC thresholds.
Affiliate income is taxable income, and in the United States it is generally treated as self-employment or business income. This page outlines the federal basics so you know what to plan for. It is general educational information, not tax advice; consult a qualified tax professional about your circumstances.
How affiliate income is taxed
A US affiliate operating as a sole proprietor typically reports income and expenses on Schedule C (Form 1040) to determine net profit, then computes self-employment tax on Schedule SE. Income is taxable whether or not anyone sends you a tax form.
Self-employment tax
The self-employment tax rate is 15.3% — 12.4% for Social Security plus 2.9% for Medicare. The Social Security portion applies up to an annual wage base that is indexed each year; the Medicare portion has no cap. You generally must file and pay self-employment tax if your net earnings from self-employment are $400 or more, and you may deduct roughly half of the self-employment tax in computing adjusted gross income.
Quarterly estimated taxes
Because no employer withholds tax from affiliate income, self-employed individuals generally must pay estimated taxes in four installments during the year using Form 1040-ES, covering both income tax and self-employment tax. Missing estimated payments can trigger penalties.
Information returns: 1099-K and 1099-NEC
The reporting thresholds changed under the 2025 federal tax legislation (the One Big Beautiful Bill Act):
- Form 1099-K (from payment apps and marketplaces): the threshold reverted to the long-standing $20,000 and 200 transactions, reversing the earlier $600 rule.
- Form 1099-NEC/1099-MISC: the threshold rose from $600 to $2,000, effective for tax year 2026, with inflation indexing beginning in 2027.
A form is not the trigger for taxability
These thresholds only govern when a payer must send you a form. All affiliate income is taxable and must be reported whether or not you receive a 1099. Do not assume income below a threshold is untaxed.
Deductions
Ordinary and necessary business expenses are deductible on Schedule C — for example, web hosting and domains, software and tools, advertising, professional fees, internet, education, and a home office if it qualifies. Free products received in exchange for promotion are generally taxable at fair market value. Good records substantiate deductions; see record-keeping.
Beyond federal and beyond the US
State and local taxes may also apply, and affiliates outside the US face their own regimes and, in many cases, VAT or GST considerations. The principle is universal: affiliate earnings are income, and you are responsible for reporting and paying the tax due where you operate.
Authoritative sources
Last reviewed July 2026. This page is general educational information, not legal or tax advice.