How TTS Traders Report Section 475 MTM Gains and Losses on Form 4797

Last Updated on September 15, 2026 by Robert Green

The election, accounting-method change, segregation rules, and tax-return reporting

Executive Summary

Trader tax status (TTS) and a Section 475(f) mark-to-market (MTM) election are related but separate. TTS is based on the taxpayer’s trading activity. Section 475 is an optional accounting-method election available to a qualifying securities or commodities trading business, and it must be made on time.

For securities properly covered by a valid Section 475 election, gains and losses are ordinary, open business positions are marked to market at year-end, the capital-loss limitation does not apply, and the wash-sale rule does not apply. Those trades move from Form 8949 and Schedule D to Form 4797 Part II, line 10. Properly identified investment positions remain capital assets and stay outside the election.

Section 475 simplifies wash-sale accounting for elected business positions, but it does not eliminate trade accounting. The return still needs transaction detail, year-end valuations, a proceeds-and-basis reconciliation, and a clear separation among Section 475 business securities, investment securities, Section 1256 contracts, and other products with different tax treatment.

TTS Does Not Automatically Provide Section 475 Treatment

A taxpayer may qualify for TTS and continue using the realization method for securities. In that case, realized gains and losses remain capital gains and losses, Form 8949 and Schedule D reporting continue, and the wash-sale rules still apply. TTS by itself supports the treatment of trading business expenses; it does not convert capital gains or losses into ordinary income or loss.

To use Section 475, the taxpayer must qualify as a trader for the elected trade or business and make a timely, valid election. An investor cannot elect Section 475 merely because the investor trades frequently, earns substantial gains, or incurs large losses. (See How to Qualify for TTS in our Tax Center)

What Section 475 Changes

A valid Section 475 election for a securities trading business changes the character, timing, and reporting of the covered positions:

• Realized trading gains and losses are treated as ordinary rather than capital.
• Open business securities are treated as sold at fair market value on the last business day of the tax year.
• The year-end unrealized gain or loss is recognized for that year, and the position receives a new basis equal to its year-end fair market value.
• The $3,000 net capital-loss limitation does not apply to Section 475 ordinary business losses.
• The wash-sale rule does not apply to securities held in connection with the elected trading business.

Section 475 does not create self-employment income from a trader’s trading gains. It also does not automatically cover separately identified investments or every financial product in the brokerage account.

Section 475 Income May Qualify for the 20% QBI Deduction

A principal benefit for profitable TTS traders is that net Section 475 ordinary business income may qualify for the Section 199A qualified business income (QBI) deduction. The deduction can equal up to 20% of qualified business income, subject to the overall taxable-income limitation. By contrast, capital gains and losses from trading without Section 475 generally are excluded from QBI.

Trading in securities or commodities is a specified service trade or business (SSTB). For 2026, the deduction is generally available in full when taxable income before the QBI deduction does not exceed $201,750 for single and other filers, $201,775 for married taxpayers filing separately, or $403,500 for joint filers. It phases out above those levels and is fully phased out at $276,750, $276,775, and $553,500, respectively. Consequently, a profitable trader’s Section 475 income may produce a substantial QBI deduction, but higher-income traders may receive a reduced deduction or none.

Business deductions attributable to the trading business reduce QBI. The final calculation also depends on the taxpayer’s other businesses, taxable income, capital gains, suspended losses, and pass-through reporting.

Report Elected Business Securities on Form 4797 Part II

The Form 4797 instructions require traders with a Section 475 election to report gains and losses from covered securities or commodities on Part II, line 10. This includes realized gains and losses from closed trades and gains and losses from marking open positions to market at year-end.

Attach a statement using the same format as line 10 and show the details of each transaction. Separately identify positions marked to market at year-end. On Form 4797, line 10, enter “Trader—see attached” in column (a) and the statement totals in columns (d), (f), and (g). Section 475 does not authorize an unexplained net number or the Form 8949 entity shortcut using “Available upon request.”

Also enter on Form 4797, Part I, line 1a, the total gross proceeds reported on Forms 1099-B for the securities or commodities included on line 10. This entry gives the IRS a direct reconciliation point between the broker-reported proceeds and the Section 475 transactions and may reduce automated matching discrepancies.

The Form 4797 reporting package should reconcile:

• Gross proceeds from Forms 1099-B and other trading records.
• Adjusted tax basis, including opening basis and prior-year MTM basis.
• Ordinary gains and losses from positions closed during the year.
• Ordinary gains and losses recognized on positions open at year-end.
• The Section 481(a) adjustment in the first election year, when applicable.
• Positions excluded from Section 475 because they were properly identified as investments.

Form 1099-B remains an information return prepared under broker-reporting rules. It does not place elected trades on Form 4797 or convert the brokerage account to Section 475 accounting. Tax software that imports Form 1099-B into Form 8949 may therefore send covered business trades to the wrong form unless the preparer changes the default workflow.

Trade Accounting Remains Necessary

Section 475 removes wash-sale accounting for elected business positions, but active traders still need complete trade accounting. The process must import transactions, reconcile proceeds and basis, identify open positions, calculate year-end fair market value, establish the following year’s opening basis, and produce the transaction statement required for Form 4797.

GreenTraderTax recommends TradeLog as specialized trade-accounting software. The taxpayer and preparer remain responsible for selecting, documenting, and consistently applying the appropriate settings and for confirming that the final Form 4797 statement and reconciliation are correct.

The accounting should preserve an audit trail rather than produce only one unexplained total. A mixed brokerage account may require separate reporting tracks for Section 475 business securities, investment securities, Section 1256 contracts, and other financial products.

The Election Must Be Timely

An existing taxpayer generally makes the Section 475 election by the unextended due date of the federal return for the year immediately before the election year. The election statement must accompany either the timely filed return or a timely filed extension request—Form 4868 for an individual or Form 7004 for an entity—and identify the Section 475(f) election, its first effective year, and the trade or business covered. Filing an extension does not postpone the election deadline to October 15; the election statement must be filed by the original unextended due date.

A calendar-year individual seeking Section 475 treatment for 2027 generally must file the election statement by April 15, 2027. Calendar-year partnerships and S corporations generally use their earlier March 15, 2027 entity-return deadline. Adjust the date for an applicable weekend, legal holiday, or disaster postponement.

A new taxpayer—meaning a taxpayer that was not required to file a federal income tax return for the taxable year immediately preceding the election year—generally makes the election internally in its books and records no later than two months and 15 days after the first day of the election year and attaches a copy to its first return. A newly formed entity is not a cure if it does not conduct a qualifying trading business. Late Section 475 elections generally are not permitted.

Form 3115 and the Section 481(a) Adjustment

The election statement is only the first step for an existing trader changing accounting methods. A trader changing from the realization method to Section 475 MTM generally must file Form 3115, Application for Change in Accounting Method, with the timely filed return for the election year under Revenue Procedure 2025-23, Section 24.01. The current designated automatic accounting-method change number is 64.

For an automatic change in accounting method, the taxpayer attaches the original Form 3115 to the timely-filed federal income tax return for the election year. A signed duplicate copy of Form 3115—not a duplicate of the Section 475 election statement—must also be submitted to the IRS National Office no earlier than the first day of the election year and no later than the date the original Form 3115 is filed with the return. The current Form 3115 instructions direct that the duplicate automatic-change copy be sent to the IRS address in Ogden, Utah, or permit submission via the designated fax number. Taxpayers should follow the filing instructions in effect at the time they submit the form.

The change generally includes a Section 481(a) adjustment to prevent income or loss from being duplicated or omitted. In simplified terms, the adjustment reflects the net unrealized gain or loss on elected positions held at the close of the preceding tax year. A net negative adjustment generally is deducted in full in the year of change. A net positive adjustment generally is included ratably over four taxable years. Under the general accounting-method-change procedures, a taxpayer with a positive adjustment of less than $50,000 may elect to include the entire amount in the year of change. The calculation should reconcile to an opening-position schedule and the Form 4797 reporting.

A limited exception applies when the election year is the first taxable year in which the taxpayer owns securities or commodities, whichever is applicable. In that situation, Revenue Procedure 2025-23, Section 24.01(5), does not require Form 3115. With no prior accounting method or beginning positions to convert, there ordinarily is no Section 481(a) adjustment. This commonly applies to a newly formed trading entity that qualifies under Section 475 in its initial year.

Do Not Confuse the Two Exceptions

The Form 3115 waiver is separate from the election-timing rule for a new taxpayer under Revenue Procedure 99-17. The two rules ask different questions and can produce different answers. For the election deadline, a new taxpayer is one that was not required to file a federal income tax return for the taxable year immediately preceding the election year. For the Form 3115 waiver, the question is whether the election year is the first taxable year in which that taxpayer owns securities or commodities, whichever is applicable.

Starting to trade does not, by itself, make an individual a new taxpayer. Likewise, forming a trading business does not erase an individual’s prior ownership of securities because the individual and the entity are separate taxpayers. Each taxpayer applies the election-deadline rule and the Form 3115 rule to its own history.

Example 1 – newly formed trading entity. A calendar-year LLC taxed as an S corporation is formed on January 1, 2027, was not required to file a 2026 federal return, and acquires its first securities in 2027. If it otherwise qualifies for TTS, it may use the new-taxpayer election procedure by placing the election statement in its books and records by March 15, 2027, and attaching a copy to its first return. Because 2027 is also its first taxable year owning securities, Revenue Procedure 2025-23, Section 24.01(5), does not require Form 3115.

Example 2 – existing individual with prior investments. An individual has filed Form 1040 for years and owned stocks or mutual funds before starting a qualifying trading business in 2027. The individual is not a new taxpayer, so the Section 475 election statement generally must be filed by April 15, 2027, with the timely-filed 2026 return or an extension request. Because the individual previously owned the securities, the first-year ownership waiver does not apply; Form 3115 generally must accompany the timely-filed 2027 return.

Example 3 – existing taxpayer but first-time securities owner. An individual previously filed federal returns but first acquires any securities in 2027. The individual is an existing taxpayer for the election deadline and therefore cannot use the new-taxpayer 2-month-and-15-day procedure. However, 2027 may be the individual’s first taxable year owning securities, so the Form 3115 waiver may apply. This example shows why the two tests must be analyzed separately.

Failing to complete the accounting-method change can leave the taxpayer using an impermissible method even when the election statement was timely filed.

Revoking and Reelecting Section 475 Can Trigger the Five-Year Restriction

Revenue Procedure 2025-23 added important five-year restrictions. A taxpayer seeking to revoke a Section 475 election within the five taxable years ending with the year of change cannot use the automatic accounting-method-change procedure. The taxpayer must request advance consent under the nonautomatic procedures for Form 3115. A taxpayer seeking to reelect Section 475 during the five taxable years beginning with a prior revocation year likewise must use the nonautomatic procedure.

A revocation also requires a Notification Statement. The taxpayer must file it no later than the unextended due date of the original federal return for the taxable year immediately preceding the year of change and attach it to that return or a timely extension request. Form 3115 is then filed under the applicable accounting-method-change procedure, with a copy of the Notification Statement attached.

Nonautomatic method changes are costly and more burdensome than automatic changes. Revenue Procedure 2026-1 sets the standard 2026 user fee for a nonautomatic Form 3115 at $13,225, subject to any applicable reduced-fee provision. Traders should therefore treat a Section 475 election as a durable accounting-method decision rather than a year-by-year choice based on expected gains or losses.

A trader may also suspend trading-business activity because of losses, employment, other business opportunities, health, or personal circumstances. If the taxpayer ceases to conduct the elected trading business and no longer qualifies for TTS, Section 475 may become inapplicable while the election remains in effect. That result is different from formally revoking the election. The taxpayer should evaluate the treatment of existing positions, investment activity, and any later resumption of the trading business. If the suspension becomes permanent, the taxpayer should consider whether a formal revocation and a change in accounting method are appropriate.

Investment Positions Stay on Form 8949

Under Section 475(f)(1)(B), a trader may hold securities for investment only if the positions are established to the satisfaction of the IRS as having no connection to the trading business and are clearly identified in the taxpayer’s records before the close of the day on which they were acquired, originated, or entered into. A completely separate investment brokerage account is the strongest practical method of satisfying this same-day identification requirement and avoiding commingling.

Properly identified investment positions retain capital treatment. They remain on Form 8949 and Schedule D, remain subject to the wash-sale rules, and may qualify for long-term capital-gain rates. Dividends and interest retain their normal character.

Poor segregation creates risk in both directions. The IRS may deny ordinary-loss treatment for positions the taxpayer calls business trades, or for appreciated positions intended as investments, which may be included in Section 475 ordinary treatment. Contemporaneous identification and separate accounts are essential, especially when portfolio-margin arrangements place investment and trading positions in the same account.

Different Products May Require Different Tax Forms

• Section 475 business securities: Form 4797 Part II, line 10, after a valid election.
• Properly identified securities investments: Form 8949 and Schedule D.
• Qualifying Section 1256 contracts: generally Form 6781 with statutory 60/40 capital treatment. Section 475(c)(2)(E) excludes contracts subject to Section 1256(a) from the Section 475 definition of a security, so a Section 475(f) election for a securities trading business does not cover those contracts. A trader conducting a qualifying commodities trading business may consider a separate Section 475(f)(2) election for commodities. A position separately qualifying and timely identified as a hedge under Section 475(c)(2)(F) requires separate analysis.
• Sole-proprietor TTS business expenses: generally Schedule C, although trading gains and losses do not go on Schedule C.
• Partnerships and S-corporations: Form 4797 is filed with the entity return, and the ordinary result passes through to the owners, as applicable.

Product classification comes before form selection. One account can contain securities, Section 1256 contracts, investment positions, and other products requiring different tax treatments.

Capital-Loss Carryovers Do Not Become Ordinary Losses

A Section 475 election is prospective. Existing capital-loss carryovers remain capital and continue to be treated under the capital-loss rules. They do not become ordinary losses merely because the taxpayer elects Section 475 for a later year.

That can create an unfavorable mismatch: future Section 475 gains are ordinary, while old capital-loss carryovers may offset only capital gains plus the limited annual deduction. Traders should consider existing carryovers and potential investment capital gains before making the election.

Section 475 Ordinary Losses Still Face Other Limitations

Escaping the $3,000 capital-loss limitation does not make every Section 475 loss immediately deductible or refundable. For tax years beginning in 2026, the excess business loss limitation under Section 461(l) generally applies when a noncorporate taxpayer’s aggregate business deductions exceed aggregate business income and gains by more than $256,000, or $512,000 on a joint return. The disallowed excess becomes a net operating loss carryforward. Partnership and S-corporation basis limitations under Sections 704(d) and 1366(d), the at-risk rules under Section 465, the net operating loss rules under Section 172, and state-law differences can also affect the usable deduction. Post-2017 net operating loss carryforwards generally remain subject to the 80-percent taxable-income limitation. The principal benefit is that qualifying losses enter the ordinary business-loss framework instead of remaining capital losses.

Maintain a Strong Section 475 Compliance File

The IRS may deny ordinary-loss treatment if the taxpayer did not qualify for TTS, filed the election late, elected for the wrong trade or business, failed to implement the accounting-method change, or cannot distinguish business positions from investments.

Retain the election statement, proof of timely filing, TTS activity records, Form 3115, Section 481(a) workpapers, opening and year-end position reports, valuation support, broker-proceeds reconciliation, Form 4797 transaction detail, and investment-segregation records.

Bottom Line

A valid Section 475 election changes the accounting method and tax reporting for a qualifying trading business. Covered business securities receive ordinary treatment, open positions are marked to market at year-end, wash-sale rules do not apply, and the transactions are reported on Form 4797 Part II rather than Form 8949 and Schedule D.

The benefits can be significant, but the election must be conducted in a timely and proper manner. Traders still need reliable trade accounting, a complete line 10 statement, accurate year-end valuations, and disciplined separation of business trades from investments.

For the underlying wash-sale rules, see “Wash Sale Losses for Traders: How to Avoid Phantom Income and Costly Tax Traps.” For broker-reporting limits, taxpayer-level accounting, box 1g, and Form 8949, see “Wash-Sale Accounting: Why Broker Form 1099-B Reporting Is Not Taxpayer Compliance.”

Sources and Further Reading

• IRC Sections 172, 465, 475, 481, 704, 1256, and 1366.
• IRS Topic 429, Traders in Securities.
• IRS Form 4797 and the finalized 2025 Instructions for Form 4797.
• IRS Form 3115 and Instructions for Form 3115.
• Revenue Procedure 99-17.
• Revenue Procedure 2025-23, Sections 24.01 and 24.02.
• Revenue Procedure 2026-1, including Appendix A user fees.
• Revenue Procedure 2025-32, including the 2026 Section 461(l) threshold.

This article is for educational purposes and does not constitute tax advice. Consult a qualified tax professional regarding your circumstances.