Cash-Settled Options: 60/40 Treatment, Form 6781, and Section 1256 Rules

Cash-settled options are taxed one of two ways. If the option is on a broad-based index such as the S&P 500 (SPX), the Nasdaq 100 (NDX), the Russell 2000 (RUT), or the VIX, it is a Section 1256 contract: 60% of every gain or loss is treated as long-term and 40% as short-term, no matter how briefly you held it.¹ Cash-settled options that fall outside that definition follow ordinary capital gains rules, where the holding period drives the rate. The cash settlement itself does not decide the tax treatment; what the option is written on does.

Which Cash-Settled Options Get 60/40 Treatment

Section 1256 covers “nonequity options,” meaning any listed option that is not an equity option. An equity option is one tied to stock or to a narrow-based security index. Options on broad-based indices are the inverse, which is why they qualify.¹

In practice, the qualifying set includes SPX, mini-SPX (XSP), VIX, NDX, and RUT options.² These are listed, cash-settled options on broad-based indices.

The expensive mistake is assuming that options on index-tracking ETFs get the same treatment. They do not. SPY, QQQ, and IWM options are options to buy or sell shares of a fund, which makes them equity options under the statute. Cboe puts it plainly: “equity and ETF options get taxed at the short or long-term capital gains rate depending on how long you hold the position.”² Two traders can hold economically similar positions, one in SPX and one in SPY, and pay very different tax on the same profit. On a $50,000 short-term gain in the top bracket, the difference can exceed $5,000.

How the 60/40 Rate Actually Works

Under Section 1256, the 60/40 split is applied to your net gain or loss for the year regardless of holding period. Hold an SPX position for two minutes or two months and the math is the same: 60% long-term, 40% short-term.¹

For 2026, the long-term capital gains rate is 0% for single filers with taxable income up to $49,450 (up to $98,900 for married filing jointly), 15% up to $545,500 ($613,700 joint), and 20% above those thresholds. The short-term portion is taxed at your ordinary income rate. So a top-bracket trader who nets $100,000 on SPX options pays the 20% long-term rate on $60,000 and the ordinary rate on $40,000, rather than the ordinary rate on the entire amount. That blended-rate advantage is the whole reason index options attract active traders.

Year-End Mark-to-Market and Form 6781

Section 1256 imposes mandatory mark-to-market at year end. Any open positions you hold on the last business day of the tax year are treated as if you sold them at fair market value that day, and the resulting gain or loss is recognized for that year.¹ When you eventually close the position, the gain or loss is adjusted so nothing is taxed twice.

The trade-off cuts both ways. You cannot defer paper gains the way you can with a buy-and-hold stock position. You also get to recognize paper losses annually without closing the trade.

All Section 1256 activity goes on IRS Form 6781, Gains and Losses From Section 1256 Contracts and Straddles.³ Line 8 calculates 40% of the net as short-term and line 9 calculates 60% as long-term; those figures flow to Schedule D.⁴ Your broker reports the aggregate Section 1256 profit or loss on Form 1099-B in boxes 8 through 11, and that net should match what you put on Form 6781.

Wash Sales: Exempt for 1256, Applicable Otherwise

Section 1256 contracts are exempt from the wash sale rule.⁴ The wash sale rule normally disallows a loss on a security if you buy a substantially identical position within 30 days before or after the sale.⁵ For SPX and other qualifying index options, you can close a losing position and reopen a similar one immediately without losing the deduction.

Non-1256 cash-settled options get no such exemption. Close a losing position, buy a substantially identical option within the 30-day window, and the loss is disallowed and added to the basis of the replacement.⁵ An option with the same underlying, expiration, and strike clearly meets the “substantially identical” test. Traders who roll positions frequently in the same underlying should track this carefully; disallowed losses pile up in basis and create year-end tracking problems.

Carrying Section 1256 Losses Back Three Years

If you end the year with a net Section 1256 loss, you can carry it back three years to offset Section 1256 gains in any of those earlier years, applied to the earliest year first.⁴ A carryback can generate a refund on taxes you already paid, which is worth real money after a losing year following profitable ones.

Several conditions apply. Only individuals may elect; corporations, estates, and trusts cannot. The amount you can carry back is the smaller of your net Section 1256 loss above $3,000 ($1,500 if married filing separately), or the total capital loss carryover you would otherwise have. The amount applied to any single prior year cannot exceed the Section 1256 gains from that year. To elect, check box D on Form 6781 and file either Form 1045 or an amended return with an amended Form 6781 and Schedule D for each carryback year.

Cash-Settled Options That Are Not Section 1256

Cash-settled options on individual stocks and on narrow-based sector indices follow standard capital gains rules. Positions held one year or less produce short-term gains taxed at ordinary income rates; positions held longer than one year produce long-term gains at preferential rates.⁶ Because most option strategies close within weeks or months, gains here are almost always short-term and taxed at ordinary rates in full.

There is no year-end mark-to-market for these positions. Open positions can cross the calendar year without triggering recognition, which is the opposite of how Section 1256 works.

Straddle Rules When Positions Offset

If you hold offsetting positions that substantially diminish each other’s risk, Section 1092’s straddle rules can defer your losses. A loss on one leg is deductible only to the extent it exceeds the unrecognized gain on the offsetting leg; the rest carries forward.⁷

Important carve-out: if every leg is a Section 1256 contract and the straddle is not part of a larger straddle, the Section 1092 loss deferral rules do not apply.¹ Mark-to-market handles the timing on its own.

Mixed straddles combine at least one Section 1256 contract with at least one non-1256 position, such as SPX options held against S&P 500 ETF shares as a hedge. Three elections are available for handling the mismatch:

Elect out of Section 1256 for the contract, so the whole straddle follows standard straddle rules.¹
Identify the straddle before the close of the day it is acquired, which replaces loss deferral with basis adjustments on the offsetting positions.⁷
Elect a mixed straddle account, pooling positions in a designated activity class and netting gains and losses at year end.

Mixed straddle elections are irrevocable for the tax year. If you skip the election, the mark-to-market leg can throw off a tax bill in a year when the offsetting loss is still unrealized.

The 3.8% Net Investment Income Tax

Options gains, whether Section 1256 or not, may face an additional 3.8% Net Investment Income Tax. Section 1411 applies this to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 single or $250,000 married filing jointly.⁸ Net investment income includes gains on the disposition of property, and Section 1411 also reaches income from a trade or business of trading in financial instruments. For high-income options traders, the effective rate on the short-term portion runs 3.8 points higher than the headline ordinary rate.

Estimated Tax and Mark-to-Market Surprises

A strong fourth quarter in Section 1256 positions can create a large tax bill on gains you never realized through actual trades. The IRS expects estimated payments during the year if you expect to owe at least $1,000 after withholding.⁹

Two safe harbors avoid the underpayment penalty: pay at least 90% of your current-year tax, or pay 100% of your prior-year tax (110% if your AGI exceeded $150,000, or $75,000 if married filing separately).⁹ The prior-year figure is easier to hit because you know it in advance. Traders whose profits cluster in certain quarters can also use the annualized income installment method on Schedule AI of Form 2210 to match payments to when the income was actually earned.

State Tax Treatment Varies

Not every state honors the federal 60/40 split. Some states conform fully to the Internal Revenue Code and mirror the federal blended treatment. Others tax all income at a flat rate regardless of federal characterization, which erases the state-level benefit of Section 1256. Several states have no income tax at all. Before assuming the 60/40 rate applies to your full tax bill, check whether your state conforms.

1
Office of the Law Revision Counsel. 26 USC 1256 – Section 1256 Contracts Marked to Market
2
Cboe. Index Options Benefits Tax Treatment
3
Internal Revenue Service. About Form 6781, Gains and Losses From Section 1256 Contracts and Straddles
4
Internal Revenue Service. Form 6781 – Gains and Losses From Section 1256 Contracts and Straddles
5
Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
6
Office of the Law Revision Counsel. 26 USC 1222 – Other Terms Relating to Capital Gains and Losses
7
Office of the Law Revision Counsel. 26 USC 1092 – Straddles
8
Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax
9
Internal Revenue Service. Large Gains, Lump Sum Distributions, Etc.