Day Trading Tax Estimator
Estimate federal and state taxes on your day trading gains. See NIIT impact, capital loss carryover, and your effective tax rate before filing.
Trading Income
How Day Trading Taxes Work
Day trading profits are taxed as short-term capital gains — the same rate as your regular income. That means if you're in the 32% federal bracket, you pay 32% on every dollar of trading profit. Add state taxes and potentially the 3.8% Net Investment Income Tax (NIIT), and your effective rate can exceed 40%.
This calculator estimates your total tax bill on trading gains by combining federal brackets, state rates, and NIIT. It also handles net losses — if you lost money trading, you can deduct up to $3,000 against other income, with the rest carrying forward to future years indefinitely.
Most day traders underestimate their tax liability because they don't account for NIIT or state taxes until filing. This tool shows the full picture before April surprises you. If your MAGI (modified adjusted gross income) exceeds $200,000 (single) or $250,000 (married), the 3.8% NIIT applies to your investment income on top of regular income tax.
One option for active traders: the Section 475 mark-to-market election. This lets you deduct all trading losses (not just $3,000/year), treat them as ordinary losses, and avoid wash sale headaches. The trade-off is you must pay taxes on unrealized gains at year-end. Talk to a tax professional before electing — it's irrevocable for the tax year.
Formula
Tax = Federal Bracket Rate × Net Trading Gains + State Rate × Gains + NIIT (3.8% if MAGI > threshold)
Example
You made $80,000 at your day job and $40,000 in short-term trading gains. Filing single in California.
Federal tax on trading: ~$40,000 pushed into the 22-24% brackets = ~$8,800. California state tax: $40,000 × 13.3% = $5,320. NIIT: Total MAGI is $120,000 — below the $200K threshold, so $0.
Total estimated tax on trading: ~$14,120 (35.3% effective rate on trading gains).
Frequently Asked Questions
Do day traders pay more taxes than long-term investors?
Yes. Day trading profits are short-term capital gains, taxed at ordinary income rates (10-37%). Long-term capital gains (assets held 1+ year) are taxed at 0%, 15%, or 20%. A trader in the 32% bracket pays more than double what a long-term investor pays on the same gain.
What is the wash sale rule for day traders?
If you sell a security at a loss and buy the same or substantially identical security within 30 days (before or after), the loss is disallowed for tax purposes. The disallowed loss gets added to the cost basis of the new purchase. Active day traders can trigger wash sales constantly without realizing it.
How do I report day trading on my taxes?
Report each trade on Schedule D and Form 8949. List the security, dates, proceeds, cost basis, and gain/loss. Most brokers provide a 1099-B that feeds directly into tax software. If you make hundreds of trades, consider Section 475 election or hiring a trader-specialist CPA.
Should I elect Section 475 mark-to-market?
Section 475 lets you deduct unlimited trading losses (not capped at $3,000/year), avoid wash sale complications, and treat losses as ordinary. The downside: unrealized gains are taxed at year-end, and the election is irrevocable for that year. It's best for full-time traders with significant activity. Consult a tax professional before electing.
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Disclaimer: This calculator is for educational purposes only and does not constitute financial advice. Trading involves substantial risk of loss. Past performance does not guarantee future results. Always do your own research and consult with a licensed financial advisor before making investment decisions.