To report capital gains from a 1099 on Schedule D, work in three steps: identify which 1099 variant your broker or payer sent, list each sale on Form 8949 with its proceeds and cost basis, then carry the short-term and long-term totals to Schedule D, where they net out and flow to your Form 1040. One exception shortens the path: capital gain distributions on Form 1099-DIV skip Form 8949 and go directly onto Schedule D.
Identify Which 1099 You Received
There is no single “1099 for capital gains.” Different institutions issue different variants depending on what you sold, and each one feeds the same reporting chain in a slightly different way.
Form 1099-B comes from brokers when you sell stocks, bonds, mutual fund shares, options, or commodities. It shows gross proceeds, acquisition and sale dates, and for most transactions your cost basis and whether the gain is short-term or long-term.1Internal Revenue Service. About Form 1099-B, Proceeds From Broker and Barter Exchange Transactions Held one year or less means short-term, taxed at ordinary rates; longer than a year means long-term, taxed at preferential rates.2Internal Revenue Service. Topic No. 409, Capital Gains and Losses
Form 1099-DA is the new form for digital asset sales, replacing 1099-B for cryptocurrency and similar blockchain-recorded assets beginning with the 2026 tax year. Brokers must report gross proceeds for every sale, and cost basis for digital assets that qualify as covered securities; basis reporting is voluntary for noncovered digital assets.3Internal Revenue Service. 2026 Instructions for Form 1099-DA The IRS 1099-B instructions now direct brokers to use 1099-DA for these transactions.4Internal Revenue Service. Instructions for Form 1099-B (2026) From Form 1099-DA, the reporting path to Schedule D is the same as from a 1099-B: through Form 8949. Staking rewards and similar payments are not reported on 1099-DA, though they remain taxable as income.
Form 1099-DIV reports capital gain distributions from mutual funds and certain other funds in Box 2a.5Internal Revenue Service. Instructions for Form 1099-DIV (01/2024) These are always treated as long-term, regardless of how long you have owned the fund shares; what matters is how long the fund held the underlying assets. Box 2b may show unrecaptured Section 1250 gain, taxed at a maximum of 25%, which typically appears for investors in real estate funds.6Internal Revenue Service. Treasury Decision 8836
Form 1099-S comes from a closing agent or title company when you sell real property: houses, condos, land, commercial buildings, or timeshares of 30 years or more.7Internal Revenue Service. Instructions for Form 1099-S8Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence9Internal Revenue Service. Publication 523, Selling Your Home Any gain above the exclusion still goes on Form 8949 and Schedule D.
Confirm Cost Basis and Holding Period Before You File
Every gain or loss is one subtraction: proceeds minus cost basis. Basis is what you paid, including commissions and fees, plus closing costs and qualifying improvements for real estate. If no basis is reported to the IRS, the agency can treat the entire proceeds as gain.
Brokers are required to report basis for “covered securities,” which includes most stocks bought after January 1, 2011, and mutual fund shares bought after January 1, 2012, along with certain other securities under later effective dates.10Federal Register. Basis Reporting by Securities Brokers and Basis Determination for Stock Your 1099-B indicates whether basis was reported. For older noncovered securities, the burden is on you. Even where basis is reported, check it against your records. Stock splits, mergers, spinoffs, return-of-capital distributions, and account transfers all change basis in ways brokers don’t always track cleanly.
One basis adjustment catches people every year: the wash sale rule. If you sell a security at a loss and buy a substantially identical one within 30 days before or after the sale, the loss is disallowed for that year.11Office of the Law Revision Counsel. 26 USC 1091 – Loss From Wash Sales of Stock or Securities The disallowed amount is added to the basis of the replacement shares, so you recover it when you eventually sell those. Your broker should flag wash sales on your 1099-B and adjust the reported basis, but confirm it. Missing the adjustment means understating your basis and overpaying.
Move Individual Sales Through Form 8949
Form 8949 is where each sale from a 1099-B or 1099-DA gets itemized. Part I holds short-term transactions; Part II holds long-term. Within each part, you sort transactions by whether basis was reported to the IRS and whether adjustments apply.12Internal Revenue Service. Instructions for Form 8949 (2025) For each row you enter the description, dates, proceeds, basis, any adjustment codes in column (f), and the resulting gain or loss. Wash sale adjustments and basis corrections both use codes in column (f).
There is a shortcut worth checking. If every transaction on your 1099-B has basis reported to the IRS, needs no adjustment, and doesn’t involve collectibles or qualified opportunity fund investments, you can bypass Form 8949 and enter those totals directly on Schedule D line 1a (short-term) or line 8a (long-term). A single transaction that needs an adjustment sends that batch back to Form 8949.
Combine the Totals on Schedule D
Schedule D is the summary. Part I nets short-term gains and losses, Part II nets long-term gains and losses (including capital gain distributions from 1099-DIV Box 2a), and Part III combines the two to produce your overall net capital gain or loss. That figure moves to Form 1040.12Internal Revenue Service. Instructions for Form 8949 (2025) A net gain is added to your other income. A net loss is deductible, within limits.
If Losses Exceed Gains
Capital losses beyond your gains are deductible against ordinary income up to $3,000 per year, or $1,500 if you file married filing separately.13Office of the Law Revision Counsel. 26 U.S. Code 1211 – Limitation on Capital Losses Anything above that carries forward to future years with no expiration. Losses keep their character: a short-term loss stays short-term next year, a long-term loss stays long-term.14Office of the Law Revision Counsel. 26 USC 1212 – Capital Loss Carrybacks and Carryovers The Schedule D instructions include a worksheet to calculate the carryover.15Internal Revenue Service. 2025 Instructions for Schedule D (Form 1040) Save it; carryovers from prior years are commonly forgotten.
The Rate That Applies to Your Net Gain
Short-term gains are taxed at your ordinary income rate, up to 37%. Long-term gains are taxed at 0%, 15%, or 20%. For the 2026 tax year, the brackets are:16Internal Revenue Service. Revenue Procedure 2025-32
- 0% on taxable income up to $49,450 (single), $98,900 (married filing jointly), or $66,200 (head of household).
- 15% above those thresholds and up to $545,500 (single), $613,700 (married filing jointly), or $579,600 (head of household).
- 20% on taxable income above the 15% ceiling.
Collectibles gains cap at 28%, and unrecaptured Section 1250 gain caps at 25%. High earners may also owe the 3.8% Net Investment Income Tax on the lesser of net investment income or the amount of modified adjusted gross income above $200,000 (single), $250,000 (married filing jointly), or $125,000 (married filing separately).17Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax Those thresholds are not indexed for inflation.