The IRS Test That Decides Whether a Day Trader Can Even Use Mark-to-Market
The IRS does not care how many trades you placed last year or what you call yourself, and the test it actually uses to grant access to mark-to-market accounting trips up most retirees before they even reach the election form.
This post may contain links from our sponsors and affiliates, and Flywheel Publishing may receive compensation for actions taken through them.
Plenty of retirees now place more trades in a month than their parents placed in a decade. Many have heard of mark-to-market accounting, the election that turns trading gains and losses into ordinary income, and they assume a busy brokerage account qualifies them. The tax code draws its line elsewhere: between trading a lot and being in the business of trading.
The election lives in Section 475(f) of the Internal Revenue Code. It’s available only to someone in business as a trader, and the IRS decides who that is with a facts-and-circumstances test. Labels don’t count. In the words of IRS Publication 550, “It does not matter whether you call yourself a trader or a ‘day trader.'”
Three Conditions That Separate Traders From Investors
According to Publication 550 for tax year 2025, you must meet all of the following conditions to be in business as a trader:
- “You must seek to profit from daily market movements in the prices of securities or commodities and not from dividends, interest, or capital appreciation.”
- “Your activity must be substantial.”
- “You must carry on the activity with continuity and regularity.”
The publication then lists the facts the IRS considers: typical holding periods, the frequency and dollar amount of your trades during the year, the extent to which you pursue the activity to produce income for a livelihood, and the amount of time you devote to it.
Notice what’s missing. These IRS sources publish no minimum trade count, no maximum holding period and no hours-per-week threshold. If someone quotes you a magic number, it didn’t come from these IRS sources. Fail the test and Publication 550 says you are “considered an investor, and not a trader.”
Most retirees trip on the first condition. A portfolio built to collect dividends or capture long-term growth matches the IRS’s description of an investor, however often it turns over.
What Mark-to-Market Changes on Your Return
Qualify and elect, and trading gains and losses become ordinary. They go in Part II of Form 4797, instead of as capital gains and losses on Form 8949 and Schedule D.
Open positions get taxed too. The law treats each security held in the trading business as if such security were sold for its fair market value on the last business day of such taxable year. Say you hold 200 shares bought at $40 that close at $55 on that day. You recognize $3,000 of ordinary gain without selling a share. Your basis then adjusts so the same gain isn’t taxed twice.
Expenses move as well. Interest and other investment expenses go on Schedule C (Form 1040) when they come from the trading business, and the limit on investment interest expense, which applies to investors, does not apply to interest paid or incurred in a trading business. Commissions still aren’t deductible. They go into figuring gain or loss.
Timing is strict. To elect for 2026, you had to file a statement by the due date of your 2025 return, without extensions. Once made, the election covers later years unless the IRS grants permission to revoke it.
Self-Employment Tax Stays Off Either Way
Publication 550 says trading gains and losses “are not subject to self-employment tax. This is true whether the election is made or not.” Section 1256 contracts carry a separate exception. Electing mark-to-market neither adds nor removes payroll-style tax on trading profits.
Trade-Offs That Can Cost a Retiree Real Money
Ordinary treatment cuts both ways. For 2025, the maximum capital gain rates are 0%, 15%, 20%, 25%, and 28%, and the 0% rate covers married couples filing jointly with taxable income from $0 to $96,700.
Picture a married couple filing jointly in 2025 whose taxable income remains inside that band, with a $10,000 long-term gain. As a capital gain, it’s taxed at 0%. Marked to market as ordinary income, with all of it landing in the 12% bracket, it costs $1,200.
The separation rule adds paperwork. Investment holdings must be identified as such in your records on the day you acquired them (for example, by holding them in a separate brokerage account). In practice, that means one account for trading and another for long-term holdings, with any position’s label fixed the day you buy it. Skip that step and long-held winners can be swept into ordinary treatment.
Run This Five-Question Self-Check Before Filing an Election
- Do your profits come from daily price swings rather than dividends, interest or long-term growth?
- Do you trade on most market days, all year?
- Are your trade count and dollar volume significant for the year?
- Do you rely on trading income to live?
- Do you spend working hours on it the way you would at a job?
Any “no” weakens your case, because all three conditions must be met. Picture a retiree who collects Social Security and a pension, trades a few times a week, holds positions for weeks and reinvests dividends. That retiree is an investor. A full-time trader who lives on trading income, holds positions for hours or days and trades nearly every session has a credible claim. Most active investors belong in the first group.
If you think you belong in the second, run the numbers with a CPA or Enrolled Agent before your next election deadline. The election sticks unless the IRS approves a revocation.
Contact [email protected] for any questions or corrections.
Vilma Rios is a tax professional and tax content contributor with more than 15 years of experience in tax and accounting. She specializes in federal tax research, tax education, and translating complex tax rules into clear, practical information for individuals, families, and small-business owners.
Vilma is a Content Tax Contributor II with the National Association of Tax Professionals (NATP), where she contributes to tax education and professional content. She has also presented tax information through webinars, including Spanish-language tax education, and has appeared on Telemundo 47 discussing tax topics and helping viewers understand important tax-filing requirements.
Her experience also includes tax and accounting work, tax research, IRS-related matters, and public tax education. While in college, Vilma volunteered in an IRS-sponsored tax assistance program and was recognized for her community service by local and state officials.
Known as “Your Tax Geek,” Vilma is passionate about making taxes easier to understand and helping people navigate an increasingly complex tax system.
