What Is Form 1099-B? Reporting Proceeds from Broker Transactions in 2025 and 2026

A 1099-B is an informational document that brokers send to people who have sold securities, such as stocks or bonds, through a brokerage during the year. It outlines which securities were sold and categorizes them based on tax type to help investors make sense of their capital gains or losses.

Tax filers need their 1099-B forms in order to file their tax returns and other forms at tax time, such as Schedule D and Form 8949.

» MORE: How to find a financial advisor who can help

If you sold any of the following throughout the tax year through a broker or brokerage, you can expect a 1099-B in your inbox or in the mail:

• Stocks.

• Bonds and other debt instruments.

• Short sales.

• Commodities.

• Regulated futures contracts.

• Foreign currency contracts.

• Forward contracts.

• Options.

• Securities futures contracts for cash^[0]

  Internal Revenue Service. About Form 1099-B, Proceeds from Broker and Barter Exchange Transactions. Accessed Oct 10, 2025.

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Other instances that could result in a 1099-B landing on your doorstep:

1. You participated in a barter exchange. The IRS considers the value of the trade taxable earned income^[0]

   Internal Revenue Service. About Publication 525: Taxable and Nontaxable Income. Accessed Oct 10, 2025.

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   . 

2. You received cash, stock or another type of property from a corporation that your broker knows or “has reason to know^[0]

   Internal Revenue Service. Instructions for Form 1099-B. Accessed Oct 10, 2025.

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   .” This can be a little complicated, but the instructions for Form 1099-B have more details.

» MORE: Learn about taxes on stocks

A 1099-B lists your investment sales activity and what type of transactions they were. It also typically notes:

• When you acquired a security and how much you paid for it.

• When you sold the security and for how much.

• Whether the brokerage withheld any state or federal taxes on your behalf.

All of this information is intended to help you determine your net capital gain (profit) or loss from your transactions, which will help you figure out how your investments will be taxed.

Generally, here's how that works:

• Capital gains: When you sell a security for more than you originally paid for it (your cost basis), you may have to pay either long-term or short-term capital gains tax on your profit. Which tax rate applies depends in part on how long you held the asset before deciding to sell.

• Capital losses: If you sell something for less than you paid for it, that’s a capital loss. Because the IRS taxes you on net capital gains (your total gains minus your total losses), capital losses can help reduce your capital gains and even ordinary income.

Keep in mind that even though investment gains are taxable, many things, such as tax credits and deductions, can offset or influence your final tax bill.

» Ready to crunch the numbers? Try our capital gains tax calculator

If you do a lot of business with a brokerage, you may receive what’s called a composite substitute 1099^[0]

Depending on what income you generate through the brokerage, you may see information about your dividends (1099-DIV), interest (1099-INT), stock sales (1099-B), or even miscellaneous payments (1099-MISC) on a single form.

The easiest way to tell your 1099 forms apart is to look at the abbreviations that follow the “1099” — they are typically shorthand for the type of taxable income.

Brokers are required to send a 1099-B and composite 1099s by Feb. 17^[0]

If you file with incomplete or incorrect information, you may need to file an amended return later. You can also opt to request a tax extension using Form 4868 if you think you’ll need more time to get the correct information, but keep in mind your tax payment is still due on the regular filing deadline in mid-April.

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