Mark-to-Market Election (IRC §475): Complete Guide for Active Traders

The Mark-to-Market election under IRC Section 475(f) is the single most powerful tax strategy available to active traders. It eliminates wash sale rules entirely, removes the $3,000 capital loss cap, and can turn a year of trading losses into a massive ordinary income deduction. Yet most traders have never heard of it.

What Is the Mark-to-Market Election?

Under standard capital gains treatment, securities you hold are only taxed when you sell them. Under Mark-to-Market accounting, the IRS treats all your open trading positions as if you sold them on December 31 of each year. You report the resulting gains or losses as ordinary income — not capital gains — regardless of your actual holding period.

This sounds complicated, but for active traders the practical effect is dramatic simplification combined with major tax advantages.

The 3 Big Benefits of MTM

1. Wash Sale Rules Disappear

Under MTM, the wash sale rule (IRC Section 1091) no longer applies to your trading securities. You can sell at a loss and repurchase the same security the next day — no disallowance, no adjustment. For active traders who make hundreds of round trips in the same securities, this alone can be worth tens of thousands per year.

2. The $3,000 Loss Cap Is Gone

Normally, capital losses can only offset capital gains, and net losses are capped at $3,000 per year against ordinary income. Under MTM, all trading losses become ordinary losses with no cap. A trader who loses $80,000 in a bad year can deduct all $80,000 against their W-2 income, rental income, or other ordinary income — generating an enormous refund.

3. Net Operating Loss Carryback

Because MTM losses are ordinary losses, they can create a Net Operating Loss (NOL) that may be carried back or forward to offset income in other tax years — depending on current tax law at the time.

Who Should Consider MTM?

MTM is most beneficial for traders who:

• Have significant wash sale disallowances on their 1099-B
• Have net trading losses that exceed $3,000
• Trade the same securities repeatedly throughout the year
• Want to maximize loss deductions against other ordinary income

MTM may NOT be beneficial for traders who:

• Are consistently profitable with mostly long-term gains (would lose lower capital gains rates)
• Hold positions for longer than a few months on average
• Have minimal wash sale issues and net gains under $3,000

The Critical April 15 Deadline

To elect MTM for the 2026 tax year, you must file the election statement with your 2025 tax return by April 15, 2026. This is why working with a CPA well before tax season is critical for MTM planning.

How to Make the MTM Election

The election is made by attaching a statement to your timely filed tax return (or extension) stating that you are making the mark-to-market election under IRC Section 475(f) effective for the following tax year. Once made, the election is binding and cannot be revoked without IRS permission.

The election is permanent — you need to be sure MTM makes sense for your long-term trading strategy, not just for one year.

MTM and Self-Employment Tax

A common concern: does MTM expose trading income to self-employment (SE) tax? For stock and securities traders, the answer is no. Trading income under MTM is reported on Form 4797, not Schedule C, and is not subject to SE tax. This is different from futures trading income, which has its own rules.

The Bottom Line

The Mark-to-Market election is one of the most underutilized strategies in trader taxation. For the right trader profile, it can save enormous amounts every year. The catch: it requires proper qualification, a timely election, and professional implementation. Getting it wrong — or missing the deadline — is an expensive mistake.