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What does "buy to close" mean?

"Buy to close" is how you end an option you sold, before it expires. You buy the same contract back, and your promise is gone.

Options guide · 5-minute read · Updated 2026-10-26

The short answer

Buy to close means you buy back an option you sold earlier, so the position ends. You pay whatever the option costs now. Your result is the premium you collected minus what you paid to close.

Once it fills, the "−1" in your account goes to zero. You no longer owe anything. No more assignment risk on that contract.

Why sellers buy to close

You don't have to wait for expiry. Sellers close early for a few common reasons:

• Most of the premium is already earned. If you sold for $1.00 and it's now $0.20, paying $20 to end the risk can make sense.
• You want to avoid Assignment. If a covered call is in the money and you want to keep the shares, closing it is one way out.
• The trade went wrong and you want out. Closing caps the loss on the option at today's price.
• You want to roll. Rolling is buy to close plus a new sell to open, often in one order. See rolling in simple terms.

A small example (an illustration, not a trade idea)

You own 100 shares of a made-up stock, XYZ, at $50. You sold one 30-day $55 call for $1.00 and collected $100.

Here's what buying to close at different prices means:

Note the last row. Buying back a call after a big rise costs more than you collected. Many people take that loss to keep shares they love. Others let the shares go at $55 instead.

The fill: why the price matters

Every option has two prices on the screen:

• The bid: what buyers are paying now.
• The ask: what sellers want now.

When you buy to close, you're the buyer. If you send a market order, you'll usually pay the ask, or worse if the quote moves.

Say the call shows a bid of $0.25 and an ask of $0.35. The middle is $0.30.

• A market order likely fills near $0.35. You pay $35.
• A limit order at $0.30 may fill at the middle. You pay $30.
• If it doesn't fill, raise the limit a cent or two and try again.

On one contract that's a few dollars. On a wide spread, or on ten contracts, it adds up. Our page on the four order types shows where buy to close fits.

Buy to close or let it expire?

If the option is nearly worthless near expiry, you can often let it expire. But "nearly worthless" isn't "gone." A late move can push it back into the money.

Many sellers close small leftovers to sleep well. That's a habit, not a rule. Some brokers charge no fee on cheap closes; check yours.

In the wheel strategy, closing early means you're free to sell the next option sooner.

Mistakes to avoid

• Choosing "buy to open." That would add a long option instead of ending your short. Check the ticket says "close."
• Using market orders on wide spreads. Use a limit near the middle.
• Waiting for the last penny. Holding a short option to squeeze out the final $0.05 keeps all the risk for very little.

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