What Is MTM Status for Traders in Securities?

Mark-to-market (MTM) status for traders in securities is an accounting method available under Internal Revenue Code Section 475(f) that treats every security in your trading account as if it were sold at fair market value on the last business day of the year. Gains and losses become ordinary rather than capital, the $3,000 annual capital loss deduction cap disappears, and the wash sale rule stops applying to your trading positions. To use it, you have to meet the IRS definition of a trader in securities and file a timely election that cannot be extended, revoked at will, or undone once the year has closed.

What MTM Actually Changes on Your Return

Three tax consequences follow from a valid MTM election, and they are the whole reason anyone bothers with the qualification and filing hurdles.

Ordinary Treatment Instead of Capital

All trading gains and losses become ordinary. Without MTM, a trader’s results are capital, and net capital losses are capped at $3,000 per year against ordinary income, or $1,500 if married filing separately.¹ With MTM in place, there is no cap. A $200,000 trading loss can offset $200,000 of wages, business income, or any other ordinary income in the same year.

If your trading losses exceed all your other income, the excess can generate a net operating loss. NOLs carry forward indefinitely but can offset only up to 80% of taxable income in any future year.² Even with that limit, the outcome is far better than watching most of a large capital loss go unused at $3,000 a year.

No Wash Sale Rule

The wash sale rule under Section 1091 disallows a loss on stock or securities if you buy substantially identical shares within 30 days before or after the sale.³ For someone entering and exiting the same names repeatedly, the rule can defer hundreds of losses across the year. MTM traders are exempt because their gains and losses are ordinary rather than capital, which puts them outside the rule’s scope.⁴ In a heavy year, this exemption alone can be worth tens of thousands of dollars.

A Deemed Sale Every December 31

At year-end, every security in your trading account is treated as sold at fair market value on the last business day.⁵ Any unrealized gain or loss is recognized on that year’s return, and your basis resets to that value going into the new year. You cannot defer gains by holding across the boundary.

One more piece of good news worth knowing: trading gains reported by a trader in securities are not subject to self-employment tax, even under MTM. Section 475(f) income is carved out from the self-employment rules.⁴

Do You Qualify as a Trader in Securities?

The election is useless if the IRS does not consider you a trader in the first place. This is the threshold question, and it is separate from how much money you make or lose. An investor buys and holds for long-term appreciation, dividends, or interest. A trader seeks profit from short-term price movements and runs the activity as a business.

The IRS looks for all three of the following:⁴

A profit motive tied to daily market movements, not to dividends or long-term appreciation.
Trading volume and dollar amounts substantial enough to look like a business.
Frequent, ongoing activity throughout the year rather than occasional bursts.

Trade Count

The code sets no bright-line number, but Tax Court decisions offer benchmarks. Counts of 204, 303, 313, and 372 annual trades have all been ruled insufficient. Counts above roughly 1,100 have been found substantial enough to support trader status. If your annual trade count is in the low hundreds, your claim is weak.

Time and Holding Periods

The more time you put into research, analysis, and execution, the stronger the case. Practitioners often cite four hours per day as a rough floor. Most positions should turn over quickly. Day trades are the strongest evidence of short-term intent. Regularly holding stocks for weeks or months undercuts the argument that you are trading on short-term swings.

One boundary worth noting: a dealer in securities, meaning someone who regularly buys from and sells to customers such as a market maker, is a separate category and is required to use MTM without electing it.⁵ If you trade only for your own account, you are not a dealer, and the election is not automatic.

Making the Election on Time

The MTM election has one of the least forgiving deadlines in the tax code. Miss it and you wait a full year.

If You Filed a Return Last Year

The election must be made by the original due date of the prior year’s return, without regard to extensions. A calendar-year individual who wants MTM for 2026 must file the election by April 15, 2026, either attached to the 2025 return or attached to the extension request for that return.⁶ Filing an extension for the return itself does not extend the election deadline.

The statement must include three items:⁴

A statement that you are making an election under Section 475(f).
The first tax year for which the election is effective.
The trade or business the election covers.

Section 475(f) also allows a parallel election for traders in commodities. Each election is independent, so if you trade both and want MTM for both, the statement has to say so.⁵

If You Did Not File a Return Last Year

New taxpayers who were not required to file for the year before the election year get more flexibility. Place the required statement in your books and records within two months and 15 days after the first day of the election year, then attach a copy to the return you file for that year.⁴

Form 3115 If You’ve Been Reporting Trading Already

If you have been filing returns that report trading activity under a different accounting method, switching to MTM is a change in accounting method. You must file Form 3115 with your return for the first year MTM applies, not the prior year.⁶ Form 3115 also requires a Section 481(a) adjustment to reconcile unrealized gains and losses that went unrecognized under the old method. A net increase is generally spread over four years; a net decrease is taken in the first year.

How MTM Traders File

MTM trading results go on Form 4797, not Schedule D. They belong in Part II, Line 10, as ordinary gains or losses.⁷ Business expenses tied to the trading activity, such as data subscriptions, equipment, and software, go on Schedule C.⁴ Both results flow into Form 1040.

If you also hold securities as long-term investments, you can keep those outside the year-end mark, but you must identify each one as an investment in your records before the close of the day you acquire it.⁵ The cleanest way to do this is a separate brokerage account for investments.⁴ Miss the same-day identification and MTM applies by default. You cannot reclassify a security after the fact.

Recordkeeping matters. You have to substantiate the fair market value used for each position at year-end, document every trade, and keep a clean line between trading accounts and investment accounts. The burden of proof is on you, and the IRS can challenge both the valuations and your underlying qualification as a trader.

What You Give Up

MTM is a tradeoff. Three risks deserve real weight before you file.

The election is essentially permanent. Once made, it applies every future year unless the IRS grants permission to revoke, which is difficult to obtain. In a strong year, you lose access to the preferential long-term capital gains rates on anything held long enough to qualify. Everything in the trading account is ordinary income. The election tends to make sense for traders whose holding periods are short anyway and whose losing years are frequent enough that the deduction benefit outweighs the loss of preferential rates.

Electing does not make you a trader. If the IRS later decides your activity does not clear the trader-in-securities bar, your losses get recharacterized as capital and clipped to $3,000 a year, and accuracy-related penalties can follow. Low trade counts, long holding periods, and limited time on the activity are exactly the facts that lead to that outcome.

Phantom income. The year-end deemed sale can leave you owing tax on unrealized gains even though you have not sold and have no cash from the position. In a volatile market, a position that was up on December 31 may be down by the time the tax is due, and the bill is still calculated on the year-end value.

For an active trader who consistently sees both winning and losing years, uncapped ordinary loss treatment, the wash sale exemption, and the possibility of generating an NOL make MTM the right call more often than not. For someone whose trading is closer to investing, or who cannot show the volume, time, and short holding periods the standard requires, the election creates more risk than benefit.

1
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
2
Internal Revenue Service. Tax Cuts and Jobs Act: A Comparison for Businesses
3
Office of the Law Revision Counsel. 26 U.S. Code 1091 – Loss From Wash Sales of Stock or Securities
4
Internal Revenue Service. Topic No. 429, Traders in Securities
5
Office of the Law Revision Counsel. 26 U.S. Code 475 – Mark to Market Accounting Method for Dealers in Securities
6
Internal Revenue Service. Revenue Procedure 99-17
7
Internal Revenue Service. Instructions for Form 4797