Every dollar of NIL and revenue share income is taxable as self-employment income. No withholding happens automatically. Here is what you owe, when you owe it, and how to not get caught.
NIL income is self-employment income. That means you pay income tax AND self-employment tax — which is 15.3% on the first $168,600 of net self-employment income (2024 threshold). The 15.3% covers Social Security (12.4%) and Medicare (2.9%). Your total tax burden on NIL income is typically 28–42% when you combine both. Most athletes receive a 1099-NEC from brands — not a W-2. No withholding happens automatically. You are responsible for paying your own taxes, quarterly.
The IRS requires estimated quarterly tax payments if you expect to owe $1,000 or more. Missing them triggers an underpayment penalty — separate from what you owe at filing. Quarterly due dates: April 15, June 15, September 15, January 15. State estimated taxes follow a similar calendar but vary by state. Set a recurring calendar reminder now.
Athletes spend NIL income as it arrives, then owe a lump sum at tax time that they cannot pay. The IRS underpayment penalty is in addition to the tax owed. State penalties apply separately. Getting behind on estimated taxes creates a compounding problem that is difficult to recover from mid-season. The fix is simple: open a separate account for your tax reserve and never touch it until payment is due.