2026 tax year

Day trader taxes and deductions

Trading profits are not self-employment income. That is unusual and it cuts both ways: no 15.3% on the gains, and no earned income either. So nothing to base a solo 401(k) on and nothing counting toward Social Security.

The mark-to-market election is the one that matters and the deadline traps people every year: you elect it by the due date of the PRIOR year’s return, without extensions. It cannot be made retroactively once you have had a bad year. Make it and your positions are treated as sold at year end, gains and losses become ordinary rather than capital, the wash sale rules stop applying and the $3,000 annual cap on deducting capital losses disappears. Being a trader at all requires substantial, continuous and regular activity aimed at daily price movements, an investor holding for appreciation does not qualify however large the account.

The deductions with a rule attached

These are the lines where the answer is not simply "keep the receipt"each has a cap, a percentage or a test that decides how much of the spend you actually get:

Computer: Section 179 property. Deduct the whole cost in the year it goes into service rather than spreading it over the asset's life, up to $2,560,000 a year, and 100% bonus depreciation is now permanent. The catch is the business-use test: anything used more than 50% for the business qualifies, and you deduct at that percentage rather than the full price. So anything you also use at home comes off at the share that is genuinely work, not the whole invoice.
Home office: Two methods. Simplified is $5 a square foot to a ceiling of 300 feet, $1,500, no records beyond the measurement, and no depreciation recapture when you sell the house. Actual apportions your rent or mortgage interest, utilities, insurance and repairs by floor area, usually gives more, and does bring recapture. Either way: space must be used regularly and exclusively for business. home office must be principal place of business.
Professional development: Courses that sharpen work you already sell are the clearest case there is. Spending on professional development to stay current is deductible; the training that qualified you to start is not. The test is about where you are, not what the course teaches, which is why the identical enrollment fee can be deductible for you and not for the person sitting beside you.
Internet, at the business-use percentage: You get the business-use percentage of the bill, not the bill. Business-use percentage of total cost. A line you also use personally is a split, and the split needs to be defensible rather than round.

The rest of the day trader deduction list

Ordinary and necessary business expenses, deductible in full in the year you pay them, provided they are genuinely for the business:

Software subscriptions
Market data feeds
Research subscriptions
Professional fees

Worth knowing

Trading is the rare business whose profits escape self-employment tax entirely, and the mark-to-market election has to be made a year in advance.

That is what is specific to this trade. The larger deductions are the universal ones, see the full checklist.

What each deduction is worth to you

On $100,000 of profit with no state income tax, $1,000 deducted saves $305, 30.5%, because it comes off self-employment tax and income tax together:

Net profit	Saved per $1,000 deducted	Effective
$40,000	$231	23.1%
$100,000	$305	30.5%
$200,000	$297	29.7%

The last row is worth less than the one above it, and that is not a mistake: past the Social Security wage base the self-employment part of the saving drops from 15.3% to 2.9%, and the higher income-tax bracket does not quite make up the difference. A deduction is worth most in the middle.

Add a state income tax and every row rises. The 1099 calculator applies that layer.

Where this comes from

The rules on this page that are specific rather than general are cited below. Follow a link to read the provision itself rather than taking our word for it:

Mark-to-market election: year-end positions treated as sold, gains and losses become ordinaryIRC 475(f)(1)
Trading gains are excluded from net earnings from self-employment even with the election in forceIRC 1402(a)(3)(A); IRC 475(f)(1)(D)

What these words mean

Section 179: A rule letting you deduct the whole cost of equipment in the year you start using it, instead of spreading it over the years you own it.
Depreciation: Spreading the cost of something long-lasting, a vehicle, a camera, a tractor, across the years you use it, rather than deducting it all at once.
Depreciation recapture: When you sell something you had been depreciating, the tax office takes back part of the benefit by taxing the gain up to the amount you already deducted.

General information about how these deductions work, not tax advice. Whether a particular expense is deductible for you depends on facts this page does not have, check with a tax professional before claiming anything listed here.