Section 1256 And Derivatives Tax

Section 1256 and derivatives tax

Two options can have the same underlying exposure, the same premium and the same pre-tax P&L, and be taxed under two different regimes. One of them owes tax on December 31 for a position it never closed.

These are modelling assumptions for a backtest, not tax advice. Every rule carries the authority and the date this library read it. Rules change — one of them changed nine days before this file was written, §7 — so confirm current law with a qualified professional before relying on any of it.

✅ Measured comes from scripts/section_1256.py — numpy + pandas, seed 20260909, one premium series traded once and taxed twice, under 1 s. ✅ source-verified material was read on 2026-09-09 in IRC §1256 (uscode.house.gov, prelim), IRS Publication 550 (2025) pp. 56–57 and p. 82, 15 U.S.C. §78c(a)(55), and Rev. Rul. 2026-16.

1. The two rules

✅ source-verified — IRC §1256(a)(1): each section 1256 contract held at the close of the taxable year "shall be treated as sold for its fair market value on the last business day of such taxable year (and any gain or loss shall be taken into account for the taxable year)."

✅ source-verified — IRC §1256(a)(3): gain or loss is "short-term capital gain or loss, to the extent of 40 percent" and "long-term capital gain or loss, to the extent of 60 percent". Pub 550 (2025) p. 82 adds the part that matters: "regardless of how long the contracts were held."

🔑 last business day, not December 31. ✅ Measured — last_business_day() returns 2022-12-30, 2023-12-29, 2024-12-31, 2025-12-31. ⚠️ It is a weekday rule and does not know the exchange calendar; if the market closes on the last weekday of the year the statutory date moves, so check the calendar for the years your sample actually spans.

Pub 550 (2025) p. 57 works the example this library's tests reproduce exactly: a regulated futures contract bought 2024-06-03 for $50,000 is worth $57,000 on 2024-12-31, so $7,000 is recognised on the 2024 return 60/40; sold 2025-02-03 for $56,000, a $1,000 loss is recognised in 2025, also 60/40. The year-end mark becomes the new reference. recognise_1256 implements exactly that chain.

2. ✅ source-verified — what qualifies, and where the sources stop

IRC §1256(b)(1): (A) regulated futures contract, (B) foreign currency contract, (C) nonequity option, (D) dealer equity option, (E) dealer securities futures contract. §1256(b)(2) excludes swaps, caps, floors "or similar agreements", and non-dealer securities futures.

The chain that decides an option, all in the statute:

✅ The S&P 500 is not a close call, and the IRS says so in its own words. Pub 550 (2025) p. 56, verbatim: "Nonequity options include debt options, commodity futures options, currency options, and broad-based stock index options. A broad-based stock index is based on the value of a group of diversified stocks or securities (such as the Standard and Poor's 500 index)." So an SPX-style broad-based index option is a §1256 contract — statute and the Publication's own example. Pub 550 p. 56 also carries the mechanism for the borderline cases: "Cash-settled options based on a stock index ... are nonequity options if the SEC determines that the stock index is broad based."

⚠️ The ETF-option half is NOT verified, and this library will not pretend otherwise. Every tax practitioner treats an option on SPY, QQQ or IWM as an ordinary equity option — the reasoning being that an ETF share is stock (or an interest treated as stock), so §1256(g)(6)(A) reaches it directly and the group-of-stocks sentence never applies. That reasoning is sound. But neither §1256(g) nor Pub 550 (2025) mentions exchange-traded funds anywhere, and a search of published IRS guidance on 2026-09-09 turned up no ruling squarely on the point. classify("etf_option") therefore returns "unclear", with the warning in the authority field, rather than a regime this library cannot source. Get advice before you build a backtest whose whole edge is the difference.

3. ✅ Measured — same trades, two regimes

One seeded premium series, 38 positions of 10 contracts on 42-business-day holds, plus one long-dated position opened early and never closed. The economics are identical by construction.

Pre-tax P&L, identical under both regimes: 41,280.10. Assumed rates — an input the script prints, never a default it supplies — short 37%, long 20%, so the 60/40 blend is 26.8%.

✅ Measured, and it is the internal check that says the implementation is right:

🚨 The position never closed books 12,681.11 under §1256, across three year ends, and 0.00 as an equity option. §1256 has already taxed 41,332.16 of a book that has made 41,280.10 — more than the book is worth — because the last mark is above the current price and nothing has been sold.

🔑 Two effects, and they point in opposite directions:

• Rate. 60/40 on 41,332.16 saves 4,215.88 against the short-term rate.
• Timing. §1256 recognised 12,681.11 more income, years earlier, with no cash from a sale to pay the tax with.
• Net on this book: §1256 pays 476.13 MORE tax.

4. 🚨 "60/40 is better" is only true for a short-held gain

✅ Measured — one $10,000 gain held 516 days and closed:

§1256 costs 34% more on that trade. 60/40 is a blend, and a blend is worse than the better half. It beats a short-term rate and loses to a long-term one — so the sign of the "1256 advantage" is a function of your holding period, and for a strategy that would naturally hold over a year it is a disadvantage.

⚠️ And on a net loss, the same arithmetic runs backwards: 60% of the loss is stuck in the long-term bucket at the lower rate. blended_rate() is symmetric; your P&L is not.

⚠️ One genuine consolation on the loss side, Pub 550 (2025) p. 57: an individual with a net section 1256 contracts loss may elect to carry it back 3 years, capped by the net §1256 gain in each of those years, 60/40 in each carryback year. This module does not implement the carryback — it reports the per-year schedule that a carryback calculation needs.

5. What the mark-to-market rule does to a backtest

🚨 Tax on an unrealised position is a cash-flow event with no matching cash inflow. A backtest that compounds after-tax returns must debit the tax at the year end, not at the eventual close. If your engine only taxes closes, a §1256 book will show cash it does not have.

🚨 The mark resets the reference every year, so the P&L is a chain, not a difference. Getting this wrong double-counts: the naive close − open for a position that spanned two year ends books the whole move twice if the marks were also booked. recognise_1256 carries the reference forward, and the test suite checks that the sum over years equals the total economic move to floating-point tolerance.

⚠️ Terminations and transfers count too. Pub 550 (2025) p. 57: the rule applies where rights "are terminated or transferred during the tax year" — offset, delivery, exercise, assignment or lapse, valued at the time. An expiry is not a non-event.

⚠️ Not modelled here, and each one changes the answer: the hedging-transaction exception (§1256(e), and the identification must be made before the end of the day the transaction is entered into), straddles and the loss-deferral rules, the mixed-straddle elections, §988 ordinary treatment for foreign currency, and the limited-partner/limited-entrepreneur carve-out from 60/40 for dealer contracts.

⚠️ Wash sales do not reach these contracts. Pub 550 (2025) p. 87: the wash sale rules "do not apply to losses from sales or trades of commodity futures contracts and foreign currencies." See ../wash-sale-rules/SKILL.md for the regime that does — and note the straddle rules can still defer a loss here, by a different mechanism.

6. 🚨 Dated — the qualified-exchange list moves

✅ source-verified — Rev. Rul. 2026-16, read 2026-09-09 at irs.gov/pub/irs-drop/rr-26-16.pdf: the IRS determines that ICE Endex, a regulated exchange of the Netherlands, is a qualified board or exchange within §1256(g)(7)(C) for as long as it holds a valid CFTC foreign-board-of- trade Order of Registration. Effective for ICE Endex contracts entered into on or after 2026-09-01 — nine days before this file was written — on a cut-off basis, with consent to the method change granted and Form 3115 waived.

🔑 Whether a contract is a §1256 contract at all depends on a list the IRS keeps adding to, by ruling, with prospective effective dates. A backtest that spans the effective date of one of these rulings spans two tax regimes for the same contract. §1256(g)(7) is (A) an SEC-registered national securities exchange, (B) a CFTC-designated contract market, or (C) whatever the Treasury has separately determined — and (C) is the moving part. Re-check it for the venues you trade.

7. Scripts and where this sits

scripts/section_1256.py — classify (regime plus the authority for it, "unclear" where the sources stop), sixty_forty, blended_rate, last_business_day, recognise_1256 (year-end marks chained into the close), recognise_equity_option, tax_schedule (rates are arguments), pretax_pnl, compare_regimes, and make_option_book for the seeded demo. numpy + pandas, seed 20260909, under 1 s.

• Stock lots, cost basis, and the short/long split for everything that is not a §1256 contract — ../tax-lot-matching-and-cost-basis/SKILL.md.
• The loss-disallowance regime that stops at the edge of this one — ../wash-sale-rules/SKILL.md.
• Reporting an after-tax Sharpe with the rate, jurisdiction and lot method stated — ../after-tax-backtesting/SKILL.md.
• Option lifecycle, expiry, assignment and the data a backtest needs before any of this applies — ../../../fin-core/skills/options-backtesting/SKILL.md.
• Futures contract specs, roll rules and the continuous series a futures backtest runs on — ../../../fin-futures-fx/skills/futures-continuous-contracts/SKILL.md.
• The US rulebook this sits inside — ../../../fin-core/skills/us-market-rules/SKILL.md.