SPX vs SPY Options Tax Treatment: The 60/40 Split.

A software engineer trades the S&P 500 on the side, closes 2026 up $200,000, and gets a 1099-B where every dollar is short-term. Four-day average holding period, one index, one strategy. Run the identical trades through SPX instead of SPY and roughly $20,000 of that tax bill stops existing. The SPX vs SPY options tax treatment gap is not a strategy question or a broker question. It is one definition in the Code, and it turns on what the option is written on, not what it tracks.

Section 1256 covers five things: regulated futures contracts, foreign currency contracts, nonequity options, dealer equity options, and dealer securities futures contracts. Retail options traders care about one of them. Under §1256(g)(3) a nonequity option is any listed option that is not an equity option, and §1256(g)(5) defines a listed option as any option, other than a right to acquire stock from the issuer, traded on or subject to the rules of a qualified board or exchange. Cboe is a registered national securities exchange, so that half is settled.

The work happens in §1256(g)(6). An equity option is one whose value is determined directly or indirectly by reference to any stock or any narrow-based security index, and an option on a group of stocks is an equity option only if the group meets the requirements for a narrow-based security index. That term comes from section 3(a)(55) of the Securities Exchange Act of 1934, 15 U.S.C. §78c, which makes an index narrow-based if it has nine or fewer components, if any one component exceeds 30% of the weighting, if the five highest weighted components exceed 60%, or if the bottom 25% by weight trades less than $50,000,000 a day. The S&P 500 does not come close on any of the four, which is the whole point. It is broad-based, so SPX options are nonequity options and land inside §1256. So do NDX, RUT, and the Mini-SPX contract XSP.

SPY is a different instrument wearing the same exposure. The option is written on shares of a fund that holds the index, not on the index itself, so it is an option to buy or sell stock and §1256(g)(6) makes it an equity option, and QQQ and IWM work the same way. The IRS has never published guidance addressing options on broad-based index ETFs head on, and it is worth saying so rather than pretending the question is closed. The statutory reading is not close, though. I would not claim 60/40 on SPY.

Section 1256(a)(3) treats 40% of any gain as short-term and 60% as long-term, regardless of holding period. A contract opened and closed in one morning gets the same treatment as one held nine months. For 2026 the top ordinary rate is 37% on taxable income above $640,600 single or $768,700 married filing jointly, and the top long-term rate is 20% above $545,500 or $613,700, both from Rev. Proc. 2025-32. Blend those 60/40 and you get 26.8%. Short-term gain on equity options gets 37%. That is 10.2 points on every dollar.

The 3.8% net investment income tax under §1411 rides on top of both and does not close the gap. Section 1411(c)(2)(B) sweeps in a trade or business of trading in financial instruments or commodities, so trading gains are net investment income either way. Call it 30.6% against 40.8%.

The advantage shrinks in lower brackets without disappearing. At a 22% ordinary rate with 15% long-term, the blend is 17.8% against 22%, or 4.2 points. It reverses in exactly one case: an equity option actually held more than a year is all long-term at 20%, which beats 26.8%. Almost nobody holding SPY calls for 13 months is doing it for the tax rate.

Section 1256(a)(1) treats each contract held at the close of the year as sold for its fair market value on the last business day, and the gain or loss counts for that year. Section 1256(a)(2) then adjusts basis so the same gain is not taxed twice when the position actually closes. An SPX spread sitting open on December 31, 2026 with $40,000 of paper profit produces $40,000 of 2026 income, and the cash to pay it has to come from somewhere. Equity options have no such rule. That timing cost is the honest price of the 26.8% rate.

This is the part traders miss. Section 1212(c) lets a taxpayer other than a corporation elect to carry a net section 1256 contracts loss back to each of the three preceding years, keeping the 60/40 character. The loss can only absorb net §1256 gain in those years, and it cannot create or increase a net operating loss. Estates and trusts cannot make the election. You check box D on Form 6781 and file Form 1045 within one year after the end of the loss year, attaching the loss-year Form 6781 and Schedule D plus amended versions of both for each carryback year. Anything left over carries forward under the ordinary $3,000 rule of §1211(b).

Two smaller advantages ride along. Under §1256(a)(4), a straddle whose legs are all §1256 contracts, and that is not part of a larger straddle, escapes §1092 and §263(g) entirely. And because every position is marked at year end, there is no deferred loss for the wash sale rule to disallow, unlike SPY, where §1091 is live, the same rule that does not currently reach crypto for an unrelated reason.

Section 1256 contracts show up in boxes 8 through 11 of Form 1099-B, with box 11 carrying the aggregate profit or loss that goes on Form 6781 Part I. Some brokers put broad-based ETF options in those boxes anyway. The form is a report, not a determination, and claiming 60/40 on SPY because the broker coded it that way is your position to defend, not theirs. Check which box your ETF option profit landed in before you file.

The other failure is self-inflicted. A §475(f)(2) mark-to-market election for commodities converts §1256 contracts to ordinary income and kills the 60/40 split outright. Traders who want ordinary loss treatment usually elect §475 for securities only and leave futures and index options alone on purpose. If you missed the mark-to-market election deadline this year, that is one fewer way to wreck your index option rate by accident.