How to Close an Options Position: Buy to Close vs Sell to Close

Opening a trade is the easy part. Knowing how to close it correctly, and what your options are if you don't, is where a lot of beginners get tripped up. Every options position has a specific closing order type that matches how it was opened, and getting this wrong is a common, avoidable mistake.

The Two Closing Order Types

If you bought an option to open the position (you're long), you close it with a sell to close order. This sells the contract back into the market and exits your long position.

If you sold an option to open the position (you're short), you close it with a buy to close order. This buys the contract back and exits your short position.

Matching the right closing order to how the position was opened matters because selecting the wrong one on some platforms can either fail outright or, in rarer cases, accidentally open a new, unintended position rather than closing the existing one.

Why You'd Close Early Instead of Letting It Expire

Many traders close positions before expiration rather than letting them run out the clock, for a few common reasons:

To lock in a profit. If the trade has moved favorably and achieved a meaningful portion of its potential gain, closing early secures that gain rather than risking it reversing before expiration.

To cut a loss. If the trade has moved against you and your thesis no longer looks likely to play out, closing early limits further loss rather than hoping for a reversal.

To avoid expiration mechanics. Closing before expiration sidesteps assignment risk, pin risk, and the operational complexity of letting a contract expire in or close to the money.

To free up capital or buying power. Closing a position releases the capital or margin tied up in it, which can then be redeployed elsewhere.

What Happens If You Don't Close

If you don't close a position before expiration, what happens depends on whether it finishes in the money or out of the money, and on your broker's specific policies.

Out of the money options typically expire worthless automatically, with no action needed, though the position still disappears from your account at expiration.

In the money options are typically either automatically exercised (if you're long) or you're assigned (if you're short), depending on your broker's auto-exercise threshold, which is often a specific amount in the money. This can result in a stock position being created in your account that you didn't necessarily intend, which is one of the most common sources of confusion for newer options traders. It's worth knowing your specific broker's auto-exercise rules well before expiration day, not on it.

Partial Closes

You don't have to close an entire position at once. If you're holding multiple contracts, you can close a portion while leaving the rest open, which is a common way to lock in partial profits while still participating in further upside, or to scale out of a position gradually rather than all at once.

Frequently Asked Questions

What happens if I try to close with the wrong order type?

Behavior varies by broker, but using the wrong closing order type can fail to execute, or in some cases open an unintended new position instead of closing the existing one. Always confirm the order is set to close the right side of the position before submitting.

Do I have to close a position before expiration?

No, but letting it expire means the outcome is determined automatically by whether it's in or out of the money, rather than by your own decision, and it can result in stock being assigned into your account.

Can I close only part of a multi-contract position?

Yes. Partial closes are common and let you lock in gains or reduce exposure while keeping the remaining contracts open.