Section 1256 Contract Tax Treatment US Futures

When to Use

Use this skill to compute Form 6781 Part I for one tax year on a book of IRC §1256 contracts, and to model what a §1256 loss is actually worth.

§1256 does three things at once, and all three matter:

1. A mandatory mark. Each §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" (§1256(a)(1)) — whether or not you closed it, and whether or not you want the income.
2. A character split. 40% short-term, 60% long-term (§1256(a)(3)), "regardless of how long the contracts were held" (Instructions for Form 6781). With the top 2026 ordinary rate at 37% and the top §1(h) capital rate at 20%, the blended rate is 26.8% — a saving of 10.2 percentage points of net gain against all-short-term treatment.
3. A loss regime of its own. A net §1256 contracts loss can be carried back 3 years against prior §1256 gains under §1212(c), keeping its 60/40 character. A §1256 loss is deferred, not forfeited.

When NOT to Use

• To decide whether an instrument qualifies. Eligibility under §1256(b)(1) is a legal determination the engine takes as an input via contract_type, never an inference from a symbol. Whether a retail forex position is a §1256(g)(2) foreign currency contract is genuinely unsettled — see currency-gain-loss-tax-treatment-for-forex-trading.
• For straddles. §1256(a)(4) disapplies §1092 only where every leg is a §1256 contract. Mixed straddles, the §1256(d) mixed straddle election and Form 6781 Part II are out of scope; flag such legs and they are routed out.
• For identified hedges. §1256(e) takes them out of the mark entirely and their gain or loss is ordinary. Flag them and they are excluded.
• Under a §475(f)(2) commodities election. That election disapplies §1256(a) and forfeits 60/40. See mark-to-market-election-for-active-traders-us.
• For state tax, or as a return preparer. Federal only; the engine emits figures for Form 6781, not a filed form.

Prerequisites

• Python 3.10+, standard library only.
• A blotter for one tax year of Section1256Trade records: trade_id, symbol, contract_type, realized_pnl_usd, year_end_mark_pnl_usd, is_open_at_year_end, prior_year_end_cumulative_mark_usd, is_identified_hedging_transaction, is_part_of_mixed_straddle.
• A per-position §1256(b)(1) determination expressed as one of REGULATED_FUTURES, FOREIGN_CURRENCY_CONTRACT, NONEQUITY_OPTION, DEALER_EQUITY_OPTION, DEALER_SECURITIES_FUTURES_CONTRACT. Everything else goes in as EQUITY_OPTION, SECURITIES_FUTURES_CONTRACT, SWAP_OR_NOTIONAL_PRINCIPAL_CONTRACT or OTHER_NON_SECTION_1256 and is reported as excluded rather than dropped.
• Marginal rates as decimal fractions: short_term_capital_gains_rate=0.37, long_term_capital_gains_rate=0.20. 37.0 is rejected, not read as 37%.
• For a loss year: prior_section_1256_gains_usd (aggregate net §1256 gain in the 3 preceding years) and other_capital_gains_usd.

Workflow

1. Classify each position — do not let the engine guess. A regulated futures contract and a broad-based index option (SPX, NDX, RUT, VIX) qualify; an option on a single stock or on ETF shares (SPY, QQQ, IWM) is an option on stock and therefore an equity option under §1256(g)(6), which does not. Securities futures contracts and swaps are excluded by §1256(b)(2). Decision point: an unclassified position is not a §1256 contract — classify it out explicitly so its P&L still appears in the report.
2. Route out what §1256 Part I does not reach. Identified §1256(e) hedges (ordinary, Form 6781 line 4) and mixed straddle legs (Form 6781 Part II) are excluded with a warning. Absorbing either into the 60/40 split misstates both character and amount.
3. Mark every open contract to the last business day. Set is_open_at_year_end=True and supply year_end_mark_pnl_usd. A mark on a position flagged closed is rejected, not silently ignored — that silence is how a year's income gets understated by the whole mark.
4. Make the §1256(a)(2) adjustment on anything carried across a year end. Supply prior_year_end_cumulative_mark_usd and state the year's realized and mark amounts inception-to-date; the engine subtracts the prior mark. A Form 1099-B box 11 figure is already broker-adjusted — do not set the field for it, or the prior mark comes off twice.
5. Split 60/40 and read the line map. Line 5 is net §1256 P&L, line 7 is line 5 plus any carryback, line 8 is 40% → Schedule D line 4, line 9 is 60% → Schedule D line 11.
6. In a loss year, run the waterfall before concluding anything. Decision point: do not treat the excess over $3,000 as lost.
   • §1212(c) / box D: carry the net §1256 contracts loss back 3 years, against prior §1256 gains only, earliest year first, character preserved. Then verify by hand the per-year Schedule D line 16 cap and that no carryback year's NOL is increased — the engine takes an aggregate ceiling and warns.
   • §1211(b): the remainder hits other capital gains first, then the lower of $3,000 ($1,500 married filing separately) or the excess.
   • §1212(b): anything left carries forward indefinitely.
7. Read warnings before using any figure. Every exclusion, every prior-year adjustment, every uncomputed limitation lands there. An empty list is the only clean result.

Full procedure: see references/workflows.md. Standards reference: see references/standards.md. Printable pre-flight checklist: see assets/checklist.md.

Common Pitfalls

• Reporting a carried contract's whole lifetime gain again. §1256(a)(2) requires "proper adjustment ... for gain or loss taken into account by reason of paragraph (1)". A contract marked at +$30,000 last 12/31 and closed this year at +$50,000 inception-to-date contributes $20,000 this year, not $50,000. Two years without the adjustment overstates income by the first mark.
• Modelling a §1256 loss as capped at $3,000 forever. That skips the §1212(c) three-year carryback and the indefinite §1212(b) carryforward. On a $50,000 loss with $30,000 of prior §1256 gains the benefit is $9,150, not $1,110.
• Calling the mark date December 31. The statute says the last business day. In years where 12/31 falls on a weekend or holiday, marking to 12/31 values a contract on a day with no settlement price.
• Assuming any index option qualifies. §1256(g)(6) makes an option on a narrow-based security index an equity option. Broad-based index options are nonequity options; ETF options are options on stock. The distinction, not the word "index", is what decides.
• Sweeping an identified hedge into Part I. §1256(e) removes it from the mark and its gain or loss is ordinary — a Form 6781 line 4 adjustment. Reporting it as 60/40 capital is wrong in both character and placement.
• Running a mixed straddle through Part I. §1256(a)(4) shelters a straddle from §1092 only when every leg is a §1256 contract. Otherwise the §1256 loss leg must be reduced by unrecognized gain on the non-§1256 leg first.
• Quoting 26.8% as the effective maximum rate. It ignores the §1411 net investment income tax: §1256 gain of a trader in commodities or financial instruments is net investment income (§1411(c)(1)(A)(ii)), so the top federal rate is 30.6% (0.60 × 23.8% + 0.40 × 40.8%). Because NIIT is character-blind the 10.2-point saving is unaffected — but the tax bill is not.
• Forgetting that capital losses hit capital gains first. §1211(b) allows losses to the extent of gains before the $3,000 cap; omitting other_capital_gains_usd overstates what the cap costs.
• Dropping non-qualifying positions on the floor. They still belong on Form 8949 / Schedule D by their actual holding period. This engine reports them in excluded_non_section_1256_pnl_usd rather than discarding them.
• Passing rates as percentages. 37.0 is rejected; silently accepting it would overstate tax a hundredfold.

Verification

• Section1256ContractTaxTreatmentUsFuturesEngine(), one REGULATED_FUTURES trade with realized_pnl_usd=100000.0: line 9 = $60,000, line 8 = $40,000, estimated_tax_usd = $26,800, estimated_tax_if_all_short_term_usd = $37,000, tax_savings_vs_short_term_usd = $10,200, blended_rate_applied = 0.268.
• Same trade with net_investment_income_tax_rate=0.038: tax $30,600, all-short-term $40,800, saving still $10,200.
• NONEQUITY_OPTION on SPX, realized_pnl_usd=20000, year_end_mark_pnl_usd=30000, is_open_at_year_end=True: line 5 = $50,000, line 9 = $30,000, line 8 = $20,000.
• The same mark with is_open_at_year_end=False must raise ValueError.
• realized_pnl_usd=50000 with prior_year_end_cumulative_mark_usd=30000: net_section_1256_pnl_usd = $20,000, not $50,000.
• EQUITY_OPTION on AAPL, $50,000: line 5 = $0.00, excluded_non_section_1256_pnl_usd = $50,000, one warning.
• $50,000 net loss, single, elect_section_1212c_carryback=True, prior_section_1256_gains_usd=30000: net_section_1256_contracts_loss_usd = $47,000, line 6 = $30,000, line 7 = -$20,000, capital_loss_carryforward_usd = $17,000, estimated_loss_tax_benefit_usd = $9,150.
• Same loss with other_capital_gains_usd=10000 and no election: offset $10,000, ordinary deduction $3,000, carryforward $37,000, benefit $3,790.
• Same loss, filing_status="MARRIED_FILING_SEPARATELY": allowance $1,500, carryforward $48,500, benefit $555.
• short_term_capital_gains_rate=37.0, a duplicate trade_id, a NaN P&L, or taxpayer_is_estate_or_trust=True with box D must each raise.
• Run the suite:

python -m unittest discover -s skills/section-1256-contract-tax-treatment-us-futures/scripts

Related Skills

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