Day traders generally pay federal tax on their profits at ordinary income rates ranging from 10% to 37%, because positions closed within a year produce short-term capital gains that stack on top of wages and other income. High earners add a 3.8% net investment income surtax, and most states impose their own income tax on trading gains. In high-tax states, a profitable full-time trader’s combined effective rate can approach 50%.
The exact number depends on your total taxable income, your state of residence, whether you qualify as a trader in securities under IRS rules, and whether you’ve made the Section 475(f) mark-to-market election. Each of those levers can move your bill by tens of thousands of dollars.
The Federal Rate on Short-Term Trading Gains
Any security held for one year or less produces a short-term capital gain or loss when sold. Day traders close positions in hours or minutes, so nearly every trade lands in this bucket. Short-term gains are taxed at ordinary income rates, meaning they sit on top of your wages, business income, and everything else on your return.1Internal Revenue Service. Topic No. 409, Capital Gains and Losses
For 2025, federal brackets run from 10% on the first slice of taxable income up to 37% on taxable income above roughly $626,350 for single filers.2Internal Revenue Service. Federal Income Tax Rates and Brackets The 2026 brackets shift up slightly for inflation but keep the same rate structure.
The preferential long-term capital gains rates of 0%, 15%, and 20% almost never help day traders. Those rates require holding a position more than a year, which runs against the entire strategy.1Internal Revenue Service. Topic No. 409, Capital Gains and Losses If you find yourself holding a winner overnight for tax reasons, you’ve stopped day trading it.
The 3.8% Net Investment Income Tax
Above certain income thresholds, a 3.8% surtax applies to the lesser of your net investment income or the amount your modified adjusted gross income exceeds the threshold. The lines are $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately.3Internal Revenue Service. Topic No. 559, Net Investment Income Tax Short-term trading gains count as net investment income for this calculation.4Internal Revenue Service. Net Investment Income Tax The thresholds are not indexed for inflation, so more traders cross them each year. A single filer with $300,000 in combined wages and trading profits can see a top federal rate above 40% on the trading portion once the surtax kicks in.
State Tax Adds Another Layer
Most states tax short-term trading profits as ordinary income. Top rates range from zero in states like Florida, Texas, and Nevada up to more than 13% in California. Washington takes a different approach, taxing certain capital gains above $250,000 at 7% without a general income tax. Combined with federal tax and the 3.8% surtax, a high-earning trader in a high-tax state can push past 50% effective on marginal trading dollars. Some full-time traders relocate for this reason, though establishing a new domicile and cutting tax ties to the old state involves more than a lease and a driver’s license.
Wash Sales Can Inflate Your Taxable Gain
The headline rate isn’t the whole story. The wash sale rule disallows a loss on any security if you buy a substantially identical one within 30 days before or 30 days after the sale.5Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities For someone cycling through the same tickers day after day, this fires constantly.
A disallowed loss doesn’t vanish. It gets added to the cost basis of the replacement security and eventually offsets the gain when you finally close out without buying back in. The problem is timing. Across hundreds of transactions in the same names, deferred losses accumulate, and you can end a year showing a net loss in your brokerage account while your tax return shows a taxable gain. That is the phantom tax bill active traders complain about, and it is often the single biggest surprise on a first-year day trader’s return.
The Mark-to-Market Election Changes the Math
Section 475(f) of the tax code lets qualifying traders elect a different accounting method. Under mark-to-market, every open position at year-end is treated as sold at fair market value on the last business day of December, and all gains and losses are reported as ordinary income or loss rather than capital gain or loss.6Office of the Law Revision Counsel. 26 USC 475 – Mark to Market Accounting Method for Dealers in Securities
The election doesn’t lower your rate on winning years. Ordinary income is ordinary income either way. What it does is change how losses and wash sales are treated:
- Losses are unlimited. Without the election, capital losses only offset capital gains plus $3,000 of ordinary income per year, with the rest carried forward. With the election, a $50,000 losing year offsets $50,000 of other income on that year’s return.6Office of the Law Revision Counsel. 26 USC 475 – Mark to Market Accounting Method for Dealers in Securities
- Wash sale rules don’t apply to securities reported under mark-to-market accounting, except for anything you hold separately for investment. The phantom gain problem disappears.7Internal Revenue Service. Topic No. 429, Traders in Securities
Timing is strict. The election must be made by the original due date of the prior year’s return, without extensions. To use mark-to-market for 2026, attach a written election statement to your 2025 return (or extension request) filed by April 15, 2026. Miss that date and you wait another year. Once in place, the election applies to all future years unless the IRS grants permission to revoke it.6Office of the Law Revision Counsel. 26 USC 475 – Mark to Market Accounting Method for Dealers in Securities
Do You Qualify as a Trader in Securities?
Both the mark-to-market election and business expense deductions require IRS trader in securities status. That status is not a checkbox. The IRS looks at whether you seek profit from daily price swings rather than dividends or long-term appreciation, whether your trading activity is substantial, and whether you pursue it with continuity and regularity throughout the year.7Internal Revenue Service. Topic No. 429, Traders in Securities
The factors weighed include typical holding periods, number of trades and dollar volume, hours spent trading each day, and how meaningful trading income is to your livelihood.7Internal Revenue Service. Topic No. 429, Traders in Securities A busy week during earnings season won’t qualify you. Courts want to see daily activity across most of the tax year. If you don’t clear the bar, the IRS treats you as an investor, and investors get neither the mark-to-market option nor the Schedule C expense deductions described below.
Deductible Expenses Lower the Base You’re Taxed On
Qualified traders report expenses on Schedule C as a sole proprietor would.7Internal Revenue Service. Topic No. 429, Traders in Securities Deductible items typically include trading software and platform fees, real-time market data subscriptions, a dedicated home office, computer hardware, trading-related education, and the business-use portion of internet service.
Commissions and other transaction costs are not deducted separately. They fold into cost basis, reducing your gain or increasing your loss when the position closes.7Internal Revenue Service. Topic No. 429, Traders in Securities Investors who fall short of trader status can’t deduct trading-related expenses at all under current law, since the Tax Cuts and Jobs Act suspended miscellaneous itemized deductions through 2025.
What You Don’t Pay: Self-Employment Tax
A useful quirk of the rules: gains from selling securities are not subject to self-employment tax, whether you’re classified as an investor or a qualified trader.7Internal Revenue Service. Topic No. 429, Traders in Securities The 15.3% combined Social Security and Medicare tax that other self-employed people pay on net business income doesn’t apply to trading profits.
The trade-off is that trading gains generally don’t count as earned income or net earnings from self-employment, so they can’t fund a SEP IRA, Solo 401(k), or similar plan. If trading is your sole source of income, that leaves a retirement savings gap worth planning around.
Quarterly Estimated Payments Keep Penalties Off the Bill
Nobody is withholding tax from your trading profits, so the IRS expects quarterly estimated payments. The four deadlines fall on April 15, June 15, September 15, and January 15 of the following year, with weekend and holiday dates pushed to the next business day.8Internal Revenue Service. Estimated Tax
Underpay and you’ll owe a penalty on top of the tax. You avoid the penalty if your total balance due is under $1,000, or if you paid at least 90% of the current year’s tax or 100% of last year’s, whichever is smaller. If your prior-year adjusted gross income exceeded $150,000 ($75,000 for married filing separately), the 100% threshold rises to 110%.9Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty Many profitable traders simply pay 110% of last year’s total tax in four equal installments and stop worrying about it, regardless of how the current year turns out.