U.S. Options Tax Basics

This introduction concerns U.S. federal taxation of investments and was reviewed on September 23, 2026 using IRS Publication 550 for tax year 2025. It is a starting point for recordkeeping, not individualized tax advice. State rules, account type, elections and the facts of a position can change treatment; check guidance for the return year.

Identify the contract and event

Under the general capital-asset rules, closing or expiration produces an option gain or loss. A holder’s holding period can matter. For a conventional written stock option, expiration without exercise generally produces a short-term capital gain; buying it back to close generally produces a short-term gain or loss. Exercise instead affects the related stock transaction: purchased-call cost adds to acquired stock basis; assigned-put premium reduces acquired stock basis; assigned-call premium adds to sale proceeds. Exceptions and offsetting positions need separate review. See IRS Publication 550.

A simple assignment record

Suppose one standard $50 put is sold for $2 and later assigned. Record $200 premium and a $5,000 share purchase separately. Under the simple assigned-put rule, before fees or other adjustments, stock basis is $4,800, or $48 per share. Do not also count the same $200 as an independent realized option gain in that simple case.

If the shares later sell for $4,700, the simple difference from that basis is a $100 loss before applicable adjustments. A wheel journal showing $200 of “income” and a $300 stock loss has the same economic total, but its labels do not by themselves determine tax reporting.

Flag special rules before filing

Qualifying Section 1256 contracts generally use year-end mark-to-market and 60% long-term / 40% short-term treatment. Not every cash-settled option qualifies. Wash-sale rules can defer losses involving substantially identical securities or options; tax straddles can defer offsetting-position losses. Covered-call qualifications and holding-period rules add complexity. Publication 550 explains these distinctions.

Keep records that permit reconciliation

Export contract identifiers, open and close dates, quantities, multipliers, premiums, fees, assignment notices and stock transactions. Keep corporate-action memos with nonstandard deliverables. Separate cash-flow performance from the tax ledger and preserve the connection between an assigned option and the resulting stock lot.

Reconcile broker statements rather than assuming one statement captures related activity across all accounts. Ask a qualified tax professional to review uncertain classifications, replacement trades, mixed positions and elections. This page intentionally avoids universal claims about different strikes or expirations being safe from wash-sale treatment, or about a strategy name determining its tax status.