How Do Wash Sale Rules Apply to Stock Options?

Wash sale rules extend beyond simple stock purchases and sales to include options—instruments that give you the right (but not the obligation) to buy or sell stock at a fixed price. When you sell a stock at a loss and buy call options on the same stock within 30 days, or when you sell put options at a loss and own the underlying stock, the wash sale rule can disallow your loss and adjust the cost basis of your options or stock. The IRS has long held that certain options are substantially identical to their underlying stock, creating traps for options traders and covered-call writers who may not realize they have triggered a wash sale.

Quick definition: A wash sale occurs when you sell a stock at a loss and buy call options on the same stock within 30 days, or when you sell call options at a loss and buy the underlying stock. Put options are treated differently, creating a more complex but narrower rule. The wash sale disallows the loss and adjusts basis in the replacement security.

Key takeaways

• Selling stock at a loss and buying call options on the same stock within 30 days triggers a wash sale, disallowing the stock loss and adjusting the call option basis.
• Selling call options at a loss and buying the underlying stock within 30 days also triggers a wash sale, disallowing the option loss and adjusting stock basis.
• Put options have a more limited wash sale trigger: selling put options at a loss does not trigger a wash sale if you own the underlying stock, only in certain scenarios involving the mechanics of the put itself.
• Writing covered calls on a stock you own does not trigger a wash sale for the stock position, but buying the stock and writing calls within 30 days of a prior stock loss can create complications.
• Wash sale adjustments to option basis are treated differently than stock basis adjustments, and the holding period effects vary.

The IRS view: options as substantially identical securities

The IRS considers call options on a stock to be substantially identical to the underlying stock itself for wash sale purposes. This is based on economic substance: a call option gives you the right to buy the stock at a fixed strike price. If you hold a call option in-the-money (where the stock price exceeds the strike price), the option is economically very similar to owning the stock—you can exercise it and own the shares.

This equivalence is why the IRS has long held (in Revenue Ruling 2008-1, among other guidance) that:

• Selling stock at a loss and buying call options on the same stock triggers a wash sale.
• Selling call options at a loss and buying the underlying stock triggers a wash sale.
• Owning stock and buying put options on the stock generally does NOT trigger a wash sale (because a put option is a hedge, not a replacement).

However, the landscape has become more complex in recent years as options markets have evolved, and some edge cases remain uncertain.

Scenario 1: Selling stock, buying calls

The most straightforward options-related wash sale occurs when you sell stock at a loss and buy call options on the same stock within 30 days.

Example: You own 100 shares of TechStock Inc, purchased at $100/share ($10,000). The stock falls to $70/share ($7,000). You sell for a $3,000 loss on June 1. You then buy one call option contract (representing 100 shares, by standard convention) with a strike price of $75, expiring in August, on June 15 for $200. The call option is in-the-money (stock at $70 vs. strike at $75 is slightly out-of-the-money, but it is close enough to be economically meaningful).

A wash sale is triggered. Your $3,000 loss is disallowed. The question then is: how much of the $3,000 loss is allocated to adjust the basis of the call option?

The IRS's approach is to allocate the disallowed loss to the replacement "substantially identical" security. If the call option is treated as the equivalent of owning 100 shares, the full $3,000 loss might be allocated to the option. However, because the option is not identical to the stock (it is a derivative), the allocation is less straightforward. Your adjusted basis in the call option becomes $200 (the purchase price) + (some portion of $3,000). The exact portion depends on the relative economic substance of the option vs. the stock, which is not clearly defined in IRS guidance.

In practice, many tax professionals allocate the full $3,000 disallowed loss to the call option, making the adjusted basis $3,200. If you later exercise the option and buy 100 shares, your cost basis in those shares is $7,500 ($75 strike × 100 shares + $3,200 adjusted option basis, in a simplified allocation).

Scenario 2: Selling calls, buying stock

The reverse scenario also triggers a wash sale. If you sell call options at a loss and buy the underlying stock within 30 days, the loss is disallowed.

Example: You are a covered-call writer. You own 100 shares of DivStock Inc, bought at $50/share. You sell one call option contract (representing 100 shares) with a strike of $55, expiring in three months, for a $500 premium. Three months later, the call expires worthless (the stock never rose above $55). You realize a $500 loss. On the day the call expires, you decide to sell your 100 shares at the current market price and rebuy 100 shares the next day at a slightly lower price, realizing an additional loss.

If you sell your shares at a loss within 30 days of realizing the $500 loss on the expired call, a wash sale is triggered for the call option loss (not the stock loss, though both could be caught in the same 30-day window if the timing aligns). The loss on the expired call is disallowed, and your adjusted basis in the newly purchased stock is increased.

More commonly, the cash-secured put scenario triggers this: you sell put options at a loss and buy the underlying stock to lock in a loss on the puts. If the underlying stock purchase is within 30 days of the put sale, a wash sale occurs.

The put option exception and hedging

Put options are treated differently from call options. Owning a put option on a stock you own does not trigger a wash sale for the underlying stock loss. This is because a put is a hedge—it protects against downside, but it does not give you the right to acquire additional stock. The IRS does not view a put as substantially identical to the underlying stock.

However, there are nuances:

1. Buying puts after selling stock: If you sell stock at a loss on June 1 and buy put options on substantially similar stock on June 15, the wash sale rule may still apply if the puts are treated as replacements. The puts give you downside protection, which is economic exposure to the stock. Some tax professionals argue this is a gray zone.

2. Selling puts and buying stock: If you sell put options at a loss (they expire worthless) and buy the underlying stock within 30 days, a wash sale likely occurs. The put option loss is disallowed, and the stock purchase is treated as the replacement.

3. Put-call collars: A collar (long stock, long put, short call) is sometimes analyzed for wash sale purposes as a hedge, not a wash sale trigger. The IRS's position here is less clear.

Given the complexity, options involving puts and wash sales often require professional guidance.

Holding periods for options and wash sales

When a wash sale involving options occurs, the holding period of the replacement security (option or stock) resets. This creates timing complexities.

If you sell stock at a loss on June 1 and buy call options on June 15, your holding period in the call options starts June 15. If you later exercise the option in January 2025 and acquire 100 shares, those shares' holding period starts in January, not June. The stock loss is disallowed, but the eventual gain on the shares will be short-term or long-term based on the exercise (or later sale) date, not the original stock purchase date.

This separation of basis (disallowed loss adjusting the option/stock basis) and holding period (restarting on the replacement purchase date) is the same principle as with stocks, but the mechanics with options are more intricate.

Covered calls and wash sales

A common question from covered-call writers: does writing a covered call on shares I own trigger a wash sale?

The answer is generally no. Writing (selling) a call option against shares you own does not trigger a wash sale for the underlying stock, even if the call is in-the-money or if the stock price has fallen since you bought it. The covered call is a hedge or income strategy on a security you own; it is not a purchase of a substantially identical security. You are not "buying" or "replacing" the stock; you are selling someone else the right to buy it from you.

However, the tax treatment of the call premium and the eventual sale of the shares (if called away) is complex. The premium received for writing the call is typically treated as income or as a reduction in basis, depending on whether the call is in-the-money when written. If the call is exercised (called away), the stock is sold at the strike price, and your gain or loss is based on your original cost basis, not reduced by the premium received.

Wash sale complications arise if, within 30 days of selling your stock after a call is exercised, you buy the same or substantially identical stock. The wash sale rules then apply to that repurchase, disallowing any loss.

The "substantially identical" question for options

The IRS's position is that a call option is substantially identical to its underlying stock (Revenue Ruling 2008-1). However, certain nuances apply:

1. Out-of-the-money calls: A call option with a strike price significantly above the current stock price (e.g., stock at $70, strike at $100) is less economically similar to the stock than an in-the-money call. Some tax professionals argue that an out-of-the-money call is not substantially identical. The IRS has not definitively ruled on this, but it is a gray zone.

2. Different expirations: A call expiring in one month vs. six months is economically different. The longer-dated call has more value and time premium. The IRS has not explicitly ruled whether calls with different expirations on the same stock are substantially identical to each other. It is generally assumed they are (both are calls on the same stock), but the basis allocation might vary.

3. LEAPS and long-dated options: Long-dated call options (LEAPS) are sometimes treated as closer to stock substitutes because they have years of time premium. The IRS likely treats them the same as any other call for wash sale purposes, but some practitioners argue they should be treated as distinctly economically equivalent to stock.

Diagram: options wash sale decision tree

This flowchart maps the major scenarios for options and wash sale triggers.

Real-world examples

Example 1: Stock loss, call option replacement

James owns 100 shares of GrowthTech, purchased at $80/share. By October, the stock falls to $60/share. He sells for a $2,000 loss on October 10. On October 20, he believes the stock will recover and buys one call option contract (100 shares) with a strike of $65, expiring in January, for $300.

A wash sale is triggered. The $2,000 stock loss is disallowed. The adjusted basis of the call option is approximately $2,300 ($300 purchase + $2,000 disallowed loss). If James exercises the call in December and buys 100 shares at $65, his cost basis in those shares is approximately $8,300 ($65 × 100 + $2,300 / 100 allocated per share, simplified). When he later sells those shares, the gain or loss is calculated from this elevated basis.

Example 2: Covered call writer avoiding a wash sale

Maria owns 100 shares of Dividend Corp, purchased at $50/share. In March, the stock falls to $45/share but pays a dividend. Instead of selling, she writes a covered call with a strike of $48, expiring in May, receiving a $200 premium.

Maria's covered call does not trigger a wash sale for her underlying stock. The $5,000 loss ($5 per share × 100) remains unrealized and is not disallowed. If the call is exercised in May and her stock is called away at $48, she sells the shares at $48 but realizes a loss of $2 per share ($2,000 loss) because her basis is $50/share. The $200 call premium is treated separately (as income or as a reduction to the gain/loss, depending on tax treatment). This is not a wash sale because she did not buy a replacement; her shares were simply sold when called away.

Example 3: Selling put options at a loss

Alex sells one put option contract on ABC Inc with a strike of $90, expiring in two months, for a $400 premium. Two months later, ABC stock has risen to $100, and the put expires worthless. Alex realizes a $400 loss on the put. Within days, he decides to buy 100 shares of ABC at $99/share, intending to hold long-term.

A wash sale likely occurs. The $400 put loss is disallowed, and his adjusted basis in the 100 shares is $9,900 (purchase price) + $400 (disallowed loss) = $10,300, or $103/share. If he later sells at $110, his taxable gain is $700 (per share), not $1,100, because of the basis adjustment.

Example 4: Out-of-the-money call optionality

Rita sells 100 shares of SpeculativeTech at $30/share for a $2,000 loss on April 1 (purchased at $50). On April 15, she buys a call option with a strike of $70 (significantly out-of-the-money; stock is at $30) for $100, expiring in six months.

Is a wash sale triggered? The $70 strike is far above the current stock price, making the call highly speculative and not economically similar to owning the stock. Some tax professionals argue this out-of-the-money call is not substantially identical to the stock and, thus, does not trigger a wash sale. However, the IRS has not explicitly ruled on this. A conservative approach assumes a wash sale occurs, disallowing the $2,000 loss and adjusting the call option basis to $2,100.

Common mistakes

Mistake 1: Forgetting that buying calls after selling stock triggers a wash sale

Many options traders focus on the immediate option trade and do not think about the wash sale implications of a prior stock sale. If you sold stock at a loss two weeks ago, buying call options today triggers a wash sale, disallowing the stock loss.

Mistake 2: Assuming covered calls trigger wash sales for the underlying stock

Writing (selling) a covered call on shares you own does not trigger a wash sale for those shares. However, if you buy shares and write calls on them within 30 days of a prior stock loss, a wash sale may apply to the stock repurchase.

Mistake 3: Not allocating the disallowed loss to option basis

When a wash sale is triggered with options, the disallowed loss must be allocated to the option's cost basis, increasing it. Some investors fail to make this adjustment and incorrectly report gains when they later close or exercise the option.

Mistake 4: Thinking puts are always safe

Puts do not trigger a wash sale for the underlying stock in most cases. However, selling puts at a loss and buying the underlying stock within 30 days can trigger a wash sale. Be careful when selling puts and subsequently buying the stock.

Mistake 5: Miscalculating basis adjustments across multiple options

If you buy multiple option contracts (calls or puts) within the wash sale window, the disallowed loss must be allocated across all replacement contracts. Failing to account for this proportional allocation leads to incorrect basis and gain/loss calculations.

FAQ

If I sell stock at a loss and buy put options within 30 days, is that a wash sale?

Buying put options on the stock you sold at a loss is unlikely to trigger a wash sale, because puts are treated as hedges, not replacements. However, this is a gray zone, and the IRS's position is not entirely clear. To be safe, consult a tax professional if you plan to buy puts after realizing a stock loss.

Can I sell a covered call at a loss and claim the loss as a capital loss?

If you sell (write) a covered call on shares you own and the call expires worthless, you realize a loss on the call premium. This loss is generally treated as a capital loss. However, if you buy the underlying stock within 30 days of selling the call at a loss, a wash sale is triggered, disallowing the loss.

Do different expiration dates for call options trigger wash sales separately?

Generally, all calls on the same underlying stock are treated as substantially identical, regardless of expiration date. If you sell the stock at a loss and buy calls (of any expiration) within 30 days, a wash sale is triggered. The wash sale applies to all replacement calls, not just those with the same expiration.

What is the holding period for an option acquired through a wash sale adjustment?

The holding period for an option acquired through a wash sale adjustment (as a replacement security) starts on the date you purchase the option, not the date of the prior stock sale. If you buy a call option on June 15 as a replacement for a stock sold on June 1, your holding period in the call starts June 15.

Can I avoid a wash sale by buying a put instead of a call after selling stock at a loss?

In most cases, yes. Buying put options does not trigger a wash sale for a prior stock loss. However, if the IRS challenges the characterization of the put as a hedge vs. a replacement, you could face issues. For a conservative approach, wait more than 30 days if you are concerned.

Does exercising a call option that was acquired through a wash sale adjustment inherit the adjusted basis?

Yes. If a call option was acquired as a replacement in a wash sale (with adjusted basis), and you later exercise the call to buy the stock, the adjusted basis of the option is typically rolled into the cost basis of the acquired stock.

What if I own call options on a stock and then sell the underlying stock at a loss?

If you own call options and sell the underlying stock at a loss, you have not triggered a wash sale by the sale alone. However, if you buy more stock (or more calls) within 30 days, a wash sale may be triggered for the stock sale.

Related concepts

• Substantially Identical Securities and the Wash Sale Rule
• How Is Wash Sale Loss Added to Your Cost Basis?
• Does Wash Sale Status Affect Your Holding Period?
• What Is the Wash Sale Rule?

Summary

Options are subject to wash sale rules, with call options treated as substantially identical to their underlying stock. Selling stock at a loss and buying calls within 30 days triggers a wash sale, disallowing the loss and adjusting the call option basis. Selling calls at a loss and buying the underlying stock also triggers a wash sale. Put options are generally treated as hedges and do not trigger wash sales for underlying stock losses, though selling puts at a loss and buying the stock may create a wash sale situation. Writing covered calls on stock you own does not trigger a wash sale, but buying stock within 30 days of a prior loss and writing calls creates potential complications. Track option wash sales carefully and allocate disallowed losses to the option cost basis.

Next

→ The Spousal Wash Sale Trap: Filing Status and Shared Losses