Is Form 8949 Required? Exceptions and When You Must File

Form 8949 is required any time you sell or exchange a capital asset and the transaction needs more detail than a single summary line on Schedule D can carry. For most people, that means stock, bond, cryptocurrency, real estate, and other investment sales during the year. The IRS does allow two exceptions that let you report certain clean transactions directly on Schedule D or attach a broker statement in place of a line-by-line entry, so whether you actually need to fill out Form 8949 depends on what your 1099s show and whether any adjustments apply.

When You Have to File Form 8949

You need Form 8949 whenever a capital asset sale falls into any of the following situations:

Your broker didn’t report cost basis to the IRS. This is common with older stock purchases (generally those bought before 2011), certain mutual fund shares, and inherited securities.
The information on your Form 1099-B or 1099-DA is wrong or incomplete. If your broker reported an incorrect basis, or the type of gain shown doesn’t match reality, you correct it on Form 8949 using an adjustment code in column (f).¹
You had a wash sale. If you sold a security at a loss and bought the same or a substantially identical security within 30 days before or after the sale, the loss is disallowed. You report the sale on Form 8949 with code W and enter the disallowed loss as a positive number in column (g). That disallowed amount gets added to the basis of the replacement shares, deferring the loss until you sell those shares in a clean transaction.¹
You need to make any other adjustment to your gain or loss. This covers accrued market discount, selling expenses not reflected on your 1099-B, excluding gain on a home sale, or claiming the qualified small business stock exclusion under Section 1202.

Real estate sales reported on Form 1099-S also go on Form 8949, since you need to account for your adjusted basis and selling expenses to arrive at the actual gain or loss.² Collectibles like art, coins, and precious metals belong on the form as well, because they’re taxed at a different maximum rate than ordinary long-term gains.

When You Can Skip It

The IRS allows two shortcuts. Both are per-transaction, so you can use them for part of your activity and still file Form 8949 for the rest.

Exception 1: Report Directly on Schedule D

You can skip Form 8949 for any individual transaction where all of the following are true:

You received a Form 1099-B or 1099-DA showing that cost basis was reported to the IRS.
The form doesn’t show any adjustments in box 1f or 1g.
The “Ordinary” box in box 2 is not checked.
The “QOF” box in box 3 is not checked, and you aren’t electing to defer or terminate a Qualified Opportunity Fund investment.
You don’t need to correct the basis, gain, or loss.

Transactions that meet every one of those conditions can be reported in aggregate directly on Schedule D, line 1a for short-term sales and line 8a for long-term sales.³ Because the test runs transaction by transaction, 99 clean sales and one wash sale means the 99 go straight on Schedule D while only the wash sale lands on Form 8949.¹ Sales of collectibles never qualify for this shortcut, even if every other condition is met.

Exception 2: Attach the Broker Statement

For transactions that don’t qualify for the Schedule D shortcut, you can attach your broker’s substitute statement instead of typing every sale onto Form 8949. The statement has to contain the same information the form asks for: description of property, dates acquired and sold, proceeds, basis, adjustment codes, and gain or loss. On Form 8949 itself, you enter the broker’s name followed by “see attached statement” in column (a), put code M in column (f), and enter the combined totals from that broker’s statement. Each broker’s totals go on a separate row.⁴

You can combine both exceptions in a single return. Clean transactions go directly on Schedule D, and broker statements cover the rest. The one limit worth flagging: Exception 2 is not available for reporting Qualified Opportunity Fund deferrals.

Situations That Always Need the Form

A handful of specific transactions almost always require Form 8949 because the data your broker has on file is incomplete or missing.

Inherited Property

Inherited assets receive a stepped-up basis equal to the fair market value at the date of the decedent’s death, rather than what the original owner paid.⁵ Brokers rarely have the stepped-up figure on file, so the 1099-B will usually show either the decedent’s original purchase price or no basis at all. Form 8949 is where you enter the correct basis and calculate your real gain or loss.

Worthless Securities

The IRS treats a worthless security as if you sold it on the last day of the tax year for zero proceeds. You report it on Part I or Part II of Form 8949 depending on your holding period, measured from the date you originally acquired the security through December 31 of the year it became worthless.⁶ No broker issues a 1099-B for a worthless security, so the entire entry is manual.

Cryptocurrency and Digital Assets

Cryptocurrency and other digital asset sales must be reported on Form 8949, and starting with the 2025 tax year the form has dedicated boxes for them. Digital assets now go in boxes G, H, or I for short-term sales and boxes J, K, or L for long-term sales. You can no longer use boxes C or F for crypto.⁴

Brokers began issuing a new Form 1099-DA for digital asset transactions in the 2025 tax year, but most of these first-generation 1099-DAs don’t include cost basis, which means you’ll calculate and enter it yourself.⁷ If you used a decentralized exchange or self-custody wallet and received no 1099-DA at all, you still owe the same reporting on Form 8949. The IRS has been clear that the obligation exists regardless of whether a tax form was issued.⁸

Capital Gains That Don’t Go on Form 8949 at All

Some investment gains and losses skip Form 8949 entirely. Futures contracts, foreign currency contracts, and nonequity options taxed under the mark-to-market rules go on Form 6781.⁹ Installment sales use Form 6252, and involuntary conversions from casualties and thefts use Form 4684. The Form 8949 instructions list the full set of forms that handle these carve-outs.

What Happens If You Skip It When You Shouldn’t

Not reporting a capital gain doesn’t make the tax disappear. The IRS receives copies of your 1099-B, 1099-DA, and 1099-S forms, and unreported sales get flagged by automated matching. If you underreport gains due to negligence or disregard of the reporting rules, the IRS can assess an accuracy-related penalty of 20% on the underpaid tax.¹⁰

If missing gains push you past the filing threshold and you don’t file a return at all, the failure-to-file penalty kicks in at 5% of the unpaid tax per month, capping at 25%. For returns due after December 31, 2025, the minimum penalty for filing more than 60 days late is $525 or 100% of the tax due, whichever is less.¹¹ Interest compounds on top of all penalties from the original due date.

Form 8949 is filed as an attachment to Form 1040, so the deadline is the standard individual return deadline. For tax year 2026, that’s April 15, 2027. Filing Form 4868 gives you an automatic six-month extension to October 15, 2027, but only for the paperwork; any tax you owe is still due by April 15, and interest accrues on unpaid amounts from that date.¹²

If you’re waiting on a corrected 1099 or trying to reconstruct missing cost basis records, the extension buys time to get the numbers right. If you genuinely can’t determine your original purchase price for a security, the IRS default position is that basis is zero, which maximizes your taxable gain. Digging through old brokerage statements or asking your broker for historical records is almost always worth the effort before accepting that outcome.

1
Internal Revenue Service. Instructions for Form 8949 (2025)
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Internal Revenue Service. About Form 8949, Sales and other Dispositions of Capital Assets
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Internal Revenue Service. 2025 Instructions for Schedule D (Form 1040)
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Internal Revenue Service. 2025 Instructions for Form 8949
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Internal Revenue Service. Gifts and Inheritances
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Internal Revenue Service. Losses (Homes, Stocks, Other Property)
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Internal Revenue Service. Reminders for Taxpayers About Digital Assets
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Internal Revenue Service. Taxpayers Need to Report Crypto, Other Digital Asset Transactions on Their Tax Return
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Internal Revenue Service. About Form 6781, Gains and Losses From Section 1256 Contracts and Straddles
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Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments
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Internal Revenue Service. Failure to File Penalty
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Internal Revenue Service. Application for Automatic Extension of Time To File U.S. Individual Income Tax Return