Two traders put on the same S&P 500 options strategy. One uses SPX. The other uses SPY. At year-end, their trading results are identical but their tax bills are not. The difference can be thousands of dollars on a single year of options income, and it comes down to one section of the tax code most retail traders have never read. For a broader overview of how options are taxed, see options tax treatment explained.
Here is what Section 1256 does, who it helps, and how to decide whether switching from SPY to SPX options is worth it for your situation.
Key Takeaways
- SPX options are Section 1256 contracts, taxed at a blended 60% long-term / 40% short-term rate regardless of how long you held them.
- SPY options are not Section 1256 contracts. Gains held under one year are taxed at 100% short-term rates.
- At the 37% federal bracket, Section 1256 treatment reduces the effective rate from 37% to 26.8%, a savings of roughly $1,020 on every $10,000 in profits (hypothetical illustration).
- Section 1256 contracts are also exempt from the wash sale rule and use mark-to-market accounting at December 31.
- The tradeoff is real: SPX contracts are 10x larger than SPY, cash-settled, and carry wider bid-ask spreads. Smaller accounts may find SPX impractical.
The Two-Minute Explanation
Most options traders know that short-term capital gains, profits on positions held under one year, are taxed at ordinary income rates. At the top federal bracket that is 37%. Hold a position longer than a year and the rate drops to 20% for long-term capital gains.
SPY options follow this rule. Hold a SPY put for three weeks, close it for a profit, and that gain is 100% short-term. Your holding period determines everything.
SPX options play by different rules. Under Section 1256 of the Internal Revenue Code, gains and losses on “broad-based index options” are split automatically: 60% is treated as long-term capital gain and 40% is treated as short-term. This applies no matter how long you held the position. A SPX options trade you opened Monday and closed Friday still gets the 60/40 split.
The result: SPX options traders always get partial long-term capital gains treatment, even on positions measured in hours.
Section 1256 Treatment: The Math
The tax savings depend on your bracket. Here is how the arithmetic works for two common scenarios (all figures are hypothetical illustrations using federal rates only; state taxes are additional).
At the 37% top federal bracket:
- SPY (short-term only): 37% effective rate
- SPX (1256 blended): (0.60 x 20%) + (0.40 x 37%) = 12% + 14.8% = 26.8%
- Savings per $10,000 in profits: $3,700 minus $2,680 = $1,020
At the 22% bracket:
- SPY (short-term only): 22% effective rate
- SPX (1256 blended): (0.60 x 15%) + (0.40 x 22%) = 9% + 8.8% = 17.8%
- Savings per $10,000 in profits: $2,200 minus $1,780 = $420
| Scenario | Tax Rate (SPY) | Tax Rate (SPX / 1256) | Tax on $10K Profits | Savings |
|---|---|---|---|---|
| 22% bracket | 22% | 17.8% | $2,200 vs $1,780 | $420 |
| 37% bracket | 37% | 26.8% | $3,700 vs $2,680 | $1,020 |
Hypothetical illustration. Federal rates only. Does not include state or local taxes. Long-term capital gains rates of 15% and 20% used for the 22% and 37% brackets respectively, consistent with current IRS rate schedules. Consult a tax professional for guidance specific to your situation. Rates verified as of April 2026.
The benefit scales with income. If you are regularly generating options income in the upper brackets, the compounding effect of a 10-point rate reduction across multiple years is substantial.
What Qualifies as a Section 1256 Contract?
The IRS definition centers on “broad-based index options”, options on indexes that are not readily deliverable in a specific underlying security. The key distinction is that ETF options do not qualify, because an ETF is itself a security you can deliver.
Section 1256 contracts (60/40 treatment applies):
- SPX options (S&P 500 index)
- NDX options (Nasdaq-100 index)
- RUT options (Russell 2000 index)
- VIX options (CBOE Volatility Index)
- Regulated futures contracts
NOT Section 1256 (standard short/long-term rules apply):
- SPY options (SPDR S&P 500 ETF)
- QQQ options (Invesco Nasdaq-100 ETF)
- IWM options (iShares Russell 2000 ETF)
- GLD, TLT, and other ETF options
- Individual stock options
The Liquidity and Size Tradeoff
The tax advantage of SPX is real, but SPX is not a drop-in replacement for SPY. Understanding the tradeoffs is critical before making any switch.
Contract size. SPX is priced at 100 times the S&P 500 index. With the S&P 500 near current levels, one SPX contract represents approximately $557,000 in notional exposure. SPY, trading near 1/10th of the index, carries roughly $55,700 in notional exposure per contract. This means SPX is simply out of reach for smaller accounts.
Cash settlement. SPX options are cash-settled. There is no risk of waking up Monday to find you have been assigned shares you did not want. SPY options, by contrast, can result in stock delivery if they expire in the money. For short options sellers, the European-style exercise of SPX eliminates early assignment risk entirely.
Liquidity and spreads. SPY options are among the most liquid options in the market. Bid-ask spreads are typically tight, and fills are fast even on multi-leg spreads. SPX options are liquid by most measures, but spreads are wider, and slippage on complex strategies can erode a portion of the tax savings.
Who SPX is NOT for: Accounts under roughly $25,000, traders whose primary edge depends on tight SPY spreads, and anyone whose average position size is too small to absorb wider SPX fills. The tax advantage means nothing if the slippage eats through it.
The Wash Sale Exemption
Section 1256 contracts carry a second tax benefit that gets less attention: they are exempt from the wash sale rule.
Under the wash sale rule, if you sell a security at a loss and buy the same or a substantially identical security within 30 days before or after the sale, the loss is disallowed. For stock and ETF option traders, this creates planning complications at year-end.
Because SPX and other Section 1256 contracts are not securities under the wash sale definition, the rule does not apply. You can close a losing SPX position for a tax loss and re-enter the same trade the next day without forfeiting the deduction. This makes year-end tax loss harvesting considerably cleaner for index options traders.
Year-End Planning: Mark-to-Market
Section 1256 contracts use mark-to-market (MTM) accounting. On December 31 each year, any open Section 1256 positions are treated as if they were closed at their fair market value and immediately reopened. Unrealized gains and losses become realized for tax purposes.
In practical terms, if you are holding open SPX positions at year-end, those positions generate taxable events whether you close them or not. Gains in open positions increase your tax liability for that year. Losses in open positions generate deductions.
This creates a year-end planning opportunity: review open SPX positions in late December to understand your MTM tax exposure before the calendar closes.
Which Should You Choose?
SPX is worth evaluating if:
- Your account is large enough to accommodate the notional size of SPX contracts (generally $50,000 or more in dedicated options capital).
- You are in the 32% or 37% federal bracket, where the rate differential is most meaningful.
- You regularly trade S&P 500 index exposure as a core strategy, not an occasional trade.
- You want to avoid early assignment risk on short options positions.
- You want to simplify wash sale tracking at year-end.
SPY likely makes more sense if:
- Your account is small and SPX notional size would force positions too large relative to your risk tolerance.
- You depend on tight bid-ask spreads or need to adjust positions quickly with minimal slippage.
- You are in a lower tax bracket where the 1256 rate difference is modest.
- You trade options inside a tax-advantaged account (IRA, Roth IRA) where the tax distinctions do not apply.
For traders who regularly trade S&P 500 index exposure in accounts above roughly $25,000, SPX is worth a close look for tax efficiency. tastytrade supports SPX options trading and is purpose-built for defined-risk options strategies, which makes evaluating the switch straightforward if the math works for your situation.
Bottom Line
SPX and SPY options track the same underlying index, but the IRS treats them very differently. For active options traders in mid-to-upper tax brackets, Section 1256 treatment on SPX can reduce your effective federal tax rate on options profits by roughly 10 percentage points without changing the underlying trade thesis at all. The size, spread, and liquidity tradeoffs are real, but for the right account and strategy, this is one of the few legal tax advantages the tax code explicitly hands to retail options traders. Run the math for your own bracket, confirm the details with a qualified tax advisor, and decide with your eyes open.
Frequently Asked Questions
- Do Section 1256 gains get reported differently on my tax return?
- Yes. Section 1256 gains and losses are reported on IRS Form 6781 (Gains and Losses from Section 1256 Contracts and Straddles), not directly on Schedule D. The 60/40 split is calculated on Form 6781, and the resulting long-term and short-term amounts flow into Schedule D. Your broker should provide a 1099-B that separately identifies Section 1256 transactions.
- Does the 60/40 rule apply inside an IRA or Roth IRA?
- No. Inside tax-advantaged retirement accounts, gains are either tax-deferred (traditional IRA) or tax-free (Roth IRA), so the Section 1256 classification has no practical effect. The tax treatment only matters in taxable brokerage accounts.
- Can I carry back Section 1256 losses?
- Yes. Net Section 1256 losses can be carried back up to three years and applied against Section 1256 gains from those prior years, generating a potential refund. This carryback election is optional and requires filing an amended return for the applicable year. Regular capital losses cannot be carried back, only forward.
- Are SPXW (weekly SPX) options also Section 1256 contracts?
- Yes. SPXW options are weekly and end-of-month expirations on the S&P 500 index, offered by the CBOE. They are broad-based index options and qualify for Section 1256 treatment the same as standard SPX options. The tax classification is based on the underlying (the index), not the expiration cycle.