If you've heard the term mark-to-market (MTM), it's important to know that the Internal Revenue Code includes two different MTM rules. While they sound similar, they apply to different types of investments and have very different tax consequences.
The two rules are:
- Section 1256 Mark-to-Market (automatic)
- Section 475(f) Mark-to-Market Election (optional for qualifying traders)
Let's look at each one and how they're reported on a tax return.
Section 1256 Mark-to-Market Rules
Section 1256 applies automatically to certain investment contracts. At the end of each tax year, these contracts are treated as though they were sold at their fair market value (FMV), even if they're still open.
This year-end adjustment creates a gain or loss that must be reported on the tax return.
How Section 1256 Gains and Losses Are Taxed
One of the biggest advantages of Section 1256 treatment is its favorable tax rate structure:
- 60% of the gain or loss is treated as long-term capital gain or loss
- 40% is treated as short-term capital gain or loss
- Wash sale rules do not apply
This special 60/40 treatment applies regardless of how long the contract was actually held.
What Is a Section 1256 Contract?
Section 1256 contracts generally include:
- Regulated futures contracts
- Certain foreign currency contracts
- Nonequity options
- Dealer equity options
- Dealer securities futures contracts
How to Report Section 1256 Gains and Losses
Report Section 1256 gains and losses on:
Form 6781, Gains and Losses From Section 1256 Contracts and Straddles
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Section 475(f) Mark-to-Market Election
Section 475(f) is different. Instead of applying automatically, it allows certain traders to elect mark-to-market accounting for their trading business.
Under this election, all open positions are treated as sold at fair market value on the last day of the tax year.
How Section 475(f) Works
If a valid Section 475(f) election is in effect:
- All trading positions are marked to market at year-end.
- Gains and losses are treated as ordinary income or ordinary loss rather than capital gains or losses.
- Wash sale rules do not apply.
- Losses are not limited by the $3,000 annual capital loss cap.
This can be especially valuable for active traders who experience substantial trading losses.
Who Can Use the Section 475(f) Election?
The election is generally available only to taxpayers who qualify as:
- A trader in securities or commodities, and
- A taxpayer whose trading activity rises to the level of a trade or business
Investors who occasionally buy and sell securities generally do not qualify.
How To Make a Section 475(f) Election
To elect mark-to-market treatment under Section 475(f), the taxpayer must file an election statement.
The statement should include:
- A declaration that the taxpayer is making a Section 475(f) election
- The first tax year the election will be effective
- A description of the trade or business
Important Filing Deadline
The election generally must be filed by the original due date of the prior year's return, without considering extensions.
Because these rules are highly technical, taxpayers often review the requirements carefully before making the election.
How To Report Section 475(f) Gains and Losses
When a taxpayer has a valid Section 475(f) election in effect, trading gains and losses are reported as ordinary income or loss rather than capital gains or losses.
These amounts are reported on:
Form 4797, Sales of Business Property (Part II)
Reporting Section 475(f) Gains and Losses Step by Step
Compute the Annual Mark-to-Market Gain or Loss
At year-end:
- Treat all open trading positions as sold at fair market value on December 31.
- Include realized gains and losses from positions sold during the year.
- Include unrealized gains and losses from positions still open at year-end.
The result is the taxpayer's net Section 475(f) gain or loss for the year.
Report the Amount on Form 4797
Enter the total net mark-to-market gain or loss in Part II of Form 4797 as ordinary income or loss.
Because the treatment is ordinary rather than capital, the gain or loss does not flow through the normal capital gain and loss reporting rules.
Flow to Form 1040
The Form 4797 amount generally flows to:
- Schedule 1 (Form 1040), Part I
- Other income or loss
It then becomes part of the taxpayer's:
- Adjusted Gross Income (AGI)
Key Benefit of Section 475(f)
Unlike capital losses, ordinary losses reported under a valid Section 475(f) election are not subject to the $3,000 annual capital loss limitation. This means qualifying trading losses can generally offset other income without the normal capital loss restrictions.
Section 1256 vs. Section 475(f): What's the Difference?
| Feature | Section 1256 Contracts | Section 475(f) Election |
| Applies Automatically? | Yes | No, election required |
| Who Uses It? | Holders of qualifying Section 1256 contracts | Qualifying traders in securities or commodities |
| Year-End Mark-to-Market? | Yes | Yes |
| Tax Treatment | 60% long-term / 40% short-term capital gain or loss | 100% ordinary income or loss |
| Wash Sale Rules Apply? | No | No |
| Subject to $3,000 Capital Loss Limit? | Yes, capital loss rules generally apply | No |
Understanding which mark-to-market rule applies is important because it can significantly affect how trading gains and losses are taxed and reported on your return. If you're reporting Section 1256 contracts, use Form 6781. If you have a valid Section 475(f) election, report your mark-to-market trading gains and losses on Form 4797 as ordinary income or loss.