How to Report Forex Losses on Your Tax Return

How you report forex losses on your tax return depends on which tax rule your trades fall under. For most retail spot forex traders, losses are ordinary losses under Internal Revenue Code Section 988 and go on Schedule 1 of Form 1040, with no annual deduction cap. If you traded regulated currency futures or certain forward contracts, the loss is a capital loss reported on Form 6781 and subject to the $3,000 annual limit against ordinary income. And if you qualified as a trader and filed a Section 475(f) mark-to-market election on time, the loss is ordinary and goes on Form 4797. Classification is the whole game here, because it decides whether you deduct the entire loss this year or $3,000 at a time.

The Default: Section 988 Ordinary Losses

If you trade spot forex through an online broker and never filed a special election, Section 988 governs your losses. That section covers transactions denominated in or determined by reference to a foreign currency, including forward contracts, options, and the rolling spot contracts most retail brokers offer.¹

All gains and losses under Section 988 are treated as ordinary income or ordinary loss.¹ Ordinary losses offset wages, business income, interest, and anything else, dollar for dollar. No $3,000 cap. If you lost $25,000 trading spot forex and earned $80,000 from your job, your taxable income drops to $55,000 the same year. That immediate, uncapped deductibility is why most retail traders are better off staying under the default.

Report the net Section 988 loss on Schedule 1 (Form 1040), Additional Income and Adjustments to Income, as other income entered as a negative number. The total on Schedule 1 flows to Form 1040 and reduces your adjusted gross income directly. The IRS has not published form-specific instructions for Section 988 forex losses, which is why you’ll see practitioner disagreement, but Schedule 1 is the standard placement for non-business forex losses.

Convert each foreign currency amount into U.S. dollars using the exchange rate on the transaction date. The IRS does not mandate a particular source; it accepts any posted rate you apply consistently throughout the year.²

Section 1256 Contracts: Form 6781 and the 60/40 Split

Forex instruments traded on regulated exchanges, particularly currency futures and certain interbank forward contracts, fall under Section 1256 rather than Section 988. A Section 1256 contract includes regulated futures contracts and foreign currency contracts as defined by the statute.³

Two rules define the treatment. First, mark-to-market: every open position is treated as if you sold it at fair market value on the last business day of the tax year, whether or not you actually closed it. Second, the 60/40 rule: 60% of any gain or loss is long-term capital and 40% is short-term capital, regardless of holding period.⁴

Report the results in Part I of Form 6781, Gains and Losses From Section 1256 Contracts and Straddles. Form 6781 applies the split automatically: Line 8 calculates the 40% short-term portion and Line 9 calculates the 60% long-term portion.⁴ Those amounts transfer to Schedule D, where they combine with your other capital gains and losses.

Section 1256 losses are capital losses, so the $3,000 annual limit applies. Capital losses first offset any capital gains you earned during the year. Only the net loss beyond your gains is capped at $3,000 against ordinary income ($1,500 if married filing separately), with the excess carried forward indefinitely.⁵

The Three-Year Carryback Election

Section 1256 comes with a feature you won’t find in other capital loss regimes: you can carry the loss back to the three preceding tax years. The carryback is available only to individuals, not corporations, estates, or trusts.⁶

The carried-back loss can only offset net Section 1256 contract gains in those prior years. It cannot wipe out stock gains, real estate gains, or wage income. The loss goes to the earliest eligible year first and cannot create or increase a net operating loss in any carryback year, and it retains its 60/40 character.⁶ To make the election, check Box D on Form 6781 and enter the carryback amount on Line 6.⁷ If you had profitable Section 1256 trades in any of those prior three years, this can generate a refund.

Section 475(f) Mark-to-Market for Qualified Traders

If you trade forex frequently enough to run a trading business, a Section 475(f) election converts all gains and losses into ordinary income or loss and lets you deduct business expenses on Schedule C. The result on the loss side looks similar to Section 988’s default, but the election also gives you a documented basis for the treatment.

Qualifying as a Trader

The IRS draws a hard line between traders and investors. To qualify, you must meet all three of these conditions:

You trade to profit from daily price swings, not to hold positions for long-term appreciation or interest income.
Your trading activity is substantial in both frequency and dollar amount.
You trade with continuity and regularity throughout the year, not in occasional bursts.

The IRS also weighs time devoted to trading, average holding period, and whether trading income is a meaningful part of your livelihood.⁸ Someone executing a handful of trades per month while working a full-time job will almost certainly be classified as an investor.

Filing the Election

The deadline is unforgiving. Attach a written election statement to your tax return for the year before the election takes effect. To use mark-to-market for 2026, the statement must be attached to your 2025 return and filed by April 15, 2026, the unextended due date.⁸ New taxpayers who were not required to file a return for the prior year have until two months and 15 days after the first day of the election year.

The statement must specify that you are electing under Section 475(f), identify the first tax year it applies to, describe the trade or business (securities, commodities, or both), and include your name and taxpayer identification number. If your prior method for those positions was anything other than mark-to-market, you also file Form 3115 (Application for Change in Accounting Method) under Revenue Procedure 2025-23, Section 24.01.⁸ Miss the deadline and you are stuck with the default treatment for the year. There is no retroactive fix.

Reporting 475(f) Losses

Once the election is in place, all open positions are treated as sold at fair market value on the last day of the year, and every gain or loss is ordinary. Report the net result on Form 4797, Sales of Business Property, Part II. The IRS instructions for Form 4797 specifically list mark-to-market gains or losses under Section 475(f) as belonging in that part.⁹ The net flows to Schedule 1 and then to Form 1040, reducing adjusted gross income. Because the loss is ordinary, it bypasses Schedule D and faces no annual cap. Gains and losses from a 475(f) trading business are not subject to self-employment tax.⁸

The Section 988 Capital-Treatment Election

Sometimes the default ordinary treatment works against you. If you have large capital gains from other investments and your forex trades produced losses, you might want those forex losses classified as capital losses to offset those gains. Section 988(a)(1)(B) permits that election for eligible transactions, but the rules are strict.

The election applies only to forward contracts, futures, and certain options that are capital assets and not part of a straddle. You must identify each transaction you want treated as capital before the close of the day you enter it.¹ Same-day identification, contemporaneous in your books. You cannot wait until year-end and retroactively choose the better treatment. The election was written specifically to prevent that.

Think it through before you elect. If your trades lose big, capital losses exceeding capital gains are deductible against ordinary income only up to $3,000 per year, with the rest carried forward.⁵

Wash Sale Rules Do Not Apply

The wash sale rule that blocks a loss deduction on a security when you buy a substantially identical position within 30 days does not apply to forex. Section 1256 contracts are explicitly exempt under the mark-to-market framework.⁴ Foreign currency and commodity futures contracts have been excluded from wash sale treatment under longstanding IRS revenue rulings. You can close a losing forex position and immediately reopen the same pair without losing the deduction.

When Your Loss Exceeds All Your Income

If your ordinary forex losses under Section 988 or Section 475(f) exceed all your other income for the year, the excess can create a net operating loss. An NOL from a tax year beginning after December 31, 2017, carries forward indefinitely but cannot be carried back. In future years, the NOL deduction is limited to 80% of taxable income calculated before the NOL itself.¹⁰ Section 1256 capital losses cannot generate an NOL because they are not ordinary losses.

Records You Need to Support the Loss

Forex brokers are not required to issue a Form 1099-B for spot currency trades, so substantiating your losses is on you. Keep monthly and annual brokerage statements showing every trade’s date, price, and U.S. dollar equivalent. Download trade confirmations as they occur rather than relying on year-end summaries. Use a consistent, recognized exchange rate source across all transactions; conversion rates on your broker’s trade confirmations are sufficient if you apply the same source throughout the year.²

Traders claiming Section 475(f) status need to go further. Maintain a daily trade log showing the number of trades executed, hours spent on research and execution, and the nature of your strategy. Keep a copy of your timely-filed election statement. Without those records, the IRS will reclassify you as an investor, potentially converting an ordinary deduction into a capital loss subject to the $3,000 cap. If you elected capital treatment under Section 988(a)(1)(B) for specific transactions, retain the contemporaneous same-day identification records. The election is invalid without them.¹

If You Trade Through a Foreign Broker

Trading through a broker located outside the United States adds reporting obligations that have nothing to do with gains or losses but carry heavy penalties on their own. If the combined value of your foreign financial accounts exceeds $10,000 at any point during the year, you must file FinCEN Form 114 (FBAR) electronically through FinCEN’s BSA E-Filing system.¹¹ It is due April 15 with an automatic extension to October 15, and it is filed separately from your tax return. Penalties for non-willful violations are capped at $10,000 per account per year; willful violations can reach the greater of $100,000 or 50% of the account balance, even if you owe no additional tax.

Separately, Form 8938 (Statement of Specified Foreign Financial Assets) may be required with your tax return. Thresholds vary by filing status and where you live: $50,000/$75,000 for a single filer in the U.S., $100,000/$150,000 for married filing jointly in the U.S., $200,000/$300,000 for a single filer abroad, and $400,000/$600,000 for married filing jointly abroad, measured on the last day of the year and at any point during the year.¹² A domestic-only brokerage account eliminates both requirements.

The Penalty for Getting the Classification Wrong

Misclassifying forex losses or overstating deductions can trigger the accuracy-related penalty under Section 6662: 20% of the underpayment attributable to negligence or a substantial understatement of income tax. An understatement is substantial when it exceeds the greater of 10% of the tax that should have been shown or $5,000.¹³

The most common trigger is claiming ordinary loss treatment under Section 475(f) without actually qualifying as a trader, or without filing the election on time. The IRS reclassifies the loss as capital, the $3,000 limit applies, and the resulting underpayment draws the 20% penalty on top of the additional tax owed. Timely election paperwork and clean records are the only reliable protection.

1
Office of the Law Revision Counsel. 26 USC 988 – Treatment of Certain Foreign Currency Transactions
2
Internal Revenue Service. Yearly Average Currency Exchange Rates
3
Office of the Law Revision Counsel. 26 USC 1256 – Section 1256 Contracts Marked to Market
4
Internal Revenue Service. Form 6781 – Gains and Losses From Section 1256 Contracts and Straddles
5
Internal Revenue Service. Topic No. 409 Capital Gains and Losses
6
Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers
7
Internal Revenue Service. Form 6781 – Gains and Losses From Section 1256 Contracts and Straddles
8
Internal Revenue Service. Topic No. 429 Traders in Securities
9
Internal Revenue Service. Instructions for Form 4797
10
Office of the Law Revision Counsel. 26 USC 172 – Net Operating Loss Deduction
11
FinCEN. Report Foreign Bank and Financial Accounts
12
Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets
13
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments