Do I Need to File Form 8949? Triggers and Exceptions

You need to file Form 8949 if you sold or exchanged a capital asset during the tax year and either your broker did not report the cost basis to the IRS or the reported numbers need an adjustment before your gain or loss is right. The form is where you list each transaction; the totals then move to Schedule D, which is where your net capital gain or loss is actually calculated. If every one of your sales came through on a Form 1099-B with the correct basis already reported to the IRS and nothing needs correcting, you can skip Form 8949 entirely and put summary numbers straight on Schedule D.

Sales That Put You on Form 8949

The IRS defines a capital asset broadly. Almost everything you own for personal use or investment counts, with narrow exceptions for business inventory, depreciable business property, and a few similar categories.¹ When you sell one of these assets, the transaction belongs on Form 8949 unless it fits the skip rule described in the next section.

The scenarios that most often force the form:

Stock, bond, and mutual fund sales where the broker did not report cost basis to the IRS, or where the reported basis needs correcting. This is common with older securities, shares moved between brokerages, and stock received through employee compensation plans.²
Cryptocurrency and other digital asset transactions. The IRS treats digital assets as property, so every sale, trade, or exchange is a taxable event that goes on Form 8949, including trading one coin for another rather than cashing out to dollars. For 2025 transactions, U.S. brokers are required to issue Form 1099-DA on digital asset sales.³⁴
Real estate sales involving investment property or a second home. A primary residence sale only triggers the form if your gain exceeds the exclusion limit of $250,000 for single filers or $500,000 for married couples filing jointly, or if you received a Form 1099-S.⁵
Non-business bad debts. If you loaned someone money outside of a business and the debt became entirely uncollectible, you report the loss as a short-term capital loss on Part I. Partial worthlessness does not qualify.⁶
Worthless securities. If a stock or bond became completely worthless during the year, you treat it as sold on the last day of that year for zero dollars, and that deemed sale date decides whether the loss is short-term or long-term.⁷

Adjustments are the other common reason people end up on Form 8949 even when the broker did report basis. A wash sale is the classic example: if you sold a security at a loss and bought a substantially identical one within the 61-day window running from 30 days before the sale through 30 days after it, the loss is disallowed for the current year and has to be reported with an adjustment.⁸ Brokers flag wash sales inside a single account, but they cannot see repurchases you made in a different account or an IRA, so those you have to catch yourself.

Other adjustment situations that put you on the form include an incorrect basis reported by the broker, a qualified small business stock exclusion under Section 1202, and receipt of a 1099-B as a nominee for someone else who actually owns the property.²

When You Can Skip Form 8949

You can bypass Form 8949 and enter summary totals directly on Schedule D when all of the following are true for every sale in the group: your broker reported the correct cost basis to the IRS on Form 1099-B or Form 1099-DA, and no adjustment is needed for wash sales, incorrect basis, or a holding period correction.⁹ In practice, that means the broker checked the “basis reported to IRS” box and every number on the 1099 matches reality. The moment any figure needs fixing, you are back on Form 8949.

Two boundary points worth knowing. First, the skip rule works transaction by transaction, so you may end up filing Form 8949 for part of your activity while summarizing the rest straight on Schedule D. Second, the sale of a primary residence does not go on Form 8949 at all unless your gain is above the $250,000 or $500,000 exclusion or you received a Form 1099-S.⁵

If you do need the form but have a large number of trades, you do not have to list each one on the form itself. The IRS allows a separate statement containing the same information in a similar format; you then enter combined totals on Form 8949 with code “M” in the adjustment column and reference the attached statement.¹⁰

What Happens If You Don’t File It When You Should

Leaving reportable transactions off your return can trigger an accuracy-related penalty of 20 percent of the underpaid tax. The penalty jumps to 40 percent in cases involving gross valuation misstatements.¹¹ Because brokers file 1099-B and 1099-DA copies directly with the IRS, the agency has its own record of your sales and matches them against your return. Omissions surface.

Short-Term or Long-Term Changes What You Owe

If you do file Form 8949, every transaction has to be sorted into short-term or long-term. You held an asset long-term when you owned it for more than one year before selling; one year or less is short-term. The count runs from the day after you acquired the asset through the day you sold it.¹²

Short-term gains are taxed at your ordinary income rate, which can run as high as 37 percent. Long-term gains are taxed at 0, 15, or 20 percent depending on income. For 2026, single filers pay 0 percent on long-term gains up to $49,450, 15 percent above that, and 20 percent once taxable income exceeds $545,500. Joint filers hit the 15 percent rate at $98,900 and 20 percent at $613,700. Higher earners may also owe an additional 3.8 percent net investment income tax if modified adjusted gross income is above $200,000 for single filers or $250,000 for joint filers.¹³

Two rules on classification are easy to miss. Inherited property is automatically long-term regardless of how long you or the decedent actually held it, and is reported on Part II of Form 8949 with “INHERITED” entered where the acquisition date would normally go.¹⁰ A completely worthless security uses the last day of the tax year as its deemed sale date, and the resulting holding period decides whether the loss is short-term or long-term.⁷

How Form 8949 Fits with the Rest of Your Return

Form 8949 has two parts. Part I is for short-term transactions and Part II is for long-term. At the top of each part, you check a box (A through F for Part I, or D through F for Part II) that tells the IRS whether basis was reported, not reported, or no 1099-B was issued at all.⁹ Transactions falling into different box categories go on separate copies.

After the transactions are listed, you total each column and carry the results to the matching lines on Schedule D (Form 1040). Schedule D combines your short-term and long-term results into a single net gain or loss.¹⁰ Both Form 8949 and Schedule D attach to your Form 1040.

If you e-file and your tax software transmits each transaction electronically, no separate mailing is required. If you e-file but choose to submit a summary with an attached statement instead of entering each trade, you must print Form 8949 or the statement, attach it to Form 8453, and mail the paper to the IRS Receipt and Control Branch at Austin, TX 73344-0254 within three business days of your e-file acceptance.¹⁴

Form 8949 is not just for individual filers. Partnerships, S corporations, estates, and trusts use it on their respective returns as well.¹⁰

1
Office of the Law Revision Counsel. 26 USC 1221 – Capital Asset Defined
2
Internal Revenue Service. Instructions for Form 8949 (2025)
3
Internal Revenue Service. Digital Assets
4
Internal Revenue Service. Understanding Your Form 1099-DA
5
Internal Revenue Service. Topic No. 701, Sale of Your Home
6
Internal Revenue Service. Bad Debt Deduction
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Internal Revenue Service. Losses (Homes, Stocks, Other Property) 1
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Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities
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Internal Revenue Service. Form 8949 – Sales and Other Dispositions of Capital Assets (2025)
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Internal Revenue Service. 2025 Instructions for Form 8949 – Sales and Other Dispositions of Capital Assets
11
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
12
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
13
Internal Revenue Service. Net Investment Income Tax
14
Internal Revenue Service. U.S. Individual Income Tax Transmittal for an IRS e-file Return