A 1099-B reports money you received from selling an investment; a 1099-DIV reports income an investment paid you while you held it. That single difference drives everything else about the two forms, from which boxes matter to which schedule they land on and what rate the IRS applies. The same share of stock can generate both: a 1099-DIV every year it pays you a dividend, and a 1099-B the year you finally sell it. Understanding Form 1099-B vs. Form 1099-DIV is mostly about keeping those two events separate in your head.
What Each Form Actually Reports
Form 1099-B, “Proceeds From Broker and Barter Exchange Transactions,” documents every sale or disposition of a capital asset in your brokerage account during the year. That covers individual stocks, bonds, mutual fund shares, ETFs, options, futures, and cryptocurrency sold through a broker.1Internal Revenue Service. About Form 1099-B, Proceeds from Broker and Barter Exchange Transactions The form is focused entirely on exits from investment positions.
The key numbers tell the story of each trade. Box 1d shows the gross proceeds you received. Box 1e shows the cost basis, meaning what you originally paid, adjusted for things like commissions or stock splits.2Internal Revenue Service. Instructions for Form 1099-B (2026) The difference between those two numbers is your capital gain or loss. Boxes 1b and 1c record the purchase and sale dates, which determines whether a gain is short-term or long-term.
Box 3 tells you whether the security is “covered,” meaning your broker is legally required to report its cost basis to the IRS. If a security is non-covered, your broker may leave Box 1e blank, and you are responsible for calculating basis yourself. Get this wrong and the IRS will assume your basis is zero, taxing the entire sale price as a gain.
Form 1099-DIV, “Dividends and Distributions,” reports income your investments paid you while you owned them. You will receive one from any payer that distributed at least $10 in dividends during the year.3Internal Revenue Service. About Form 1099-DIV, Dividends and Distributions It covers dividends from stocks, mutual funds, ETFs, real estate investment trusts (REITs), and money market funds. Nothing on this form has anything to do with selling. You could hold a stock for decades, receive a 1099-DIV every year, and never generate a 1099-B until the year you exit.
The important boxes on the 1099-DIV do more work than most readers realize:
- Box 1a reports total ordinary dividends.
- Box 1b breaks out the portion that qualify as “qualified dividends,” which get preferential tax rates if you held the stock for more than 60 days during the 121-day window beginning 60 days before the ex-dividend date.4Legal Information Institute. 26 U.S.C. 1(h)(11) – Dividends Taxed as Net Capital Gain
- Box 2a shows capital gain distributions from mutual funds or REITs, which are taxed as long-term gains no matter how long you have owned the fund shares.
- Box 3 reports non-dividend distributions, commonly called return of capital. These are not immediately taxable; they reduce your cost basis in the security. Once basis hits zero, further return-of-capital payments become taxable capital gains.5Internal Revenue Service. Topic No. 404, Dividends and Other Corporate Distributions
- Box 5 reports Section 199A dividends, which are ordinary REIT dividends that may entitle you to a 20% qualified business income deduction. The deduction is available at any income level and does not require itemizing. Skip it and you leave a tax break on the table.6Internal Revenue Service. Instructions for Form 1099-DIV (Rev. January 2024)7Internal Revenue Service. Qualified Business Income Deduction
How Each Form Gets Taxed
The 1099-B holding period controls the rate on your sale. A security held for one year or less produces a short-term capital gain, taxed at ordinary income rates that go as high as 37% for tax year 2026.8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 A security held for more than one year produces a long-term capital gain, taxed at 0%, 15%, or 20% depending on your taxable income and filing status.9Internal Revenue Service. Topic No. 409, Capital Gains and Losses A single filer earning $150,000 in 2026 would pay 24% on a short-term gain but only 15% on a long-term gain from the same stock.
The 1099-DIV splits along similar lines. Ordinary dividends in Box 1a are taxed at your marginal ordinary rate, the same rates that apply to wages and short-term gains. Qualified dividends in Box 1b receive the long-term capital gain rates of 0%, 15%, or 20%. Capital gain distributions in Box 2a are automatically long-term, regardless of how long you have held the fund. For a high-income investor, the spread between a 37% rate on unqualified dividends and a 20% rate on qualified dividends is substantial.
Where Each Form Goes on Your Return
This is where filers mix the two up most often, and the IRS matching program is unforgiving about it.
Every sale on your 1099-B gets entered on Form 8949, sorted into short-term and long-term sections and further grouped by whether basis was reported to the IRS. The totals flow to Schedule D, which nets short-term against long-term and produces the final number that lands on your Form 1040.10Internal Revenue Service. Instructions for Form 8949
The 1099-DIV takes a different route. If your total ordinary dividends across all 1099-DIVs exceed $1,500, you itemize each payer on Schedule B.11Internal Revenue Service. About Schedule B (Form 1040), Interest and Ordinary Dividends Below $1,500, the total goes straight on Form 1040. Qualified dividends from Box 1b sit on their own line of the 1040 and are taxed using the Qualified Dividends and Capital Gain Tax Worksheet. Capital gain distributions from Box 2a flow to Schedule D but skip Form 8949 entirely, because they are already classified as long-term. Section 199A dividends from Box 5 are claimed on Form 8995 or 8995-A, with the deduction flowing to Line 13 of Form 1040.
Losses: The One-Way Advantage of a 1099-B
One of the biggest practical differences between the two forms is what you can do with a bad year. You cannot use a disappointing dividend to shrink your tax bill, but you can use a losing stock sale to wipe out a winning one. On Schedule D, short-term gains and losses net against each other, long-term gains and losses net against each other, and the two results net against each other.
If losses exceed gains for the year, you can deduct up to $3,000 of the net capital loss against ordinary income, or $1,500 if married filing separately.12Office of the Law Revision Counsel. 26 U.S. Code 1211 – Limitation on Capital Losses Any unused loss carries forward indefinitely.9Internal Revenue Service. Topic No. 409, Capital Gains and Losses Investors with large realized losses sometimes take years to use them up, applying $3,000 per year against ordinary income and netting the rest against future gains. Losing track of a carryforward is a common and costly mistake.
One trap on the 1099-B side: 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. The disallowed amount shows up in Box 1g, and it gets added to the basis of the replacement security instead of vanishing.13Internal Revenue Service. Case Study 1 – Wash Sales Your broker handles the adjustment within one account, but if you hold the same security at multiple brokers, you may need to make manual corrections on Form 8949.
The 3.8% Surtax That Hits Both
The net investment income tax (NIIT) applies an extra 3.8% to investment income when modified adjusted gross income exceeds $200,000 for single filers, $250,000 for married filing jointly, or $125,000 for married filing separately.14Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax The surtax is calculated on the lesser of your net investment income or the amount your MAGI exceeds the threshold. Capital gains from your 1099-B, dividends from your 1099-DIV, and interest income all count.
When NIIT applies, the effective top rate on long-term capital gains and qualified dividends is 23.8%, and the effective top rate on short-term gains and ordinary dividends climbs to 40.8%. The thresholds are not adjusted for inflation, so more filers cross them each year. If you are near one, the timing of a sale can be worth planning around.
If the Numbers Are Wrong
Brokers get things wrong more often than you might expect, especially cost basis. If your 1099-B reports an incorrect basis in Box 1e, you do not need to wait for a corrected form. Fix it directly on Form 8949 by entering adjustment code “B” in column (f) and recording the correction in column (g). If the holding period is wrong, use adjustment code “T” and report the transaction in the correct section.15Internal Revenue Service. Form 8949 Codes
For 1099-DIV errors, contact your broker and request a corrected form. The IRS matches 1099-DIV amounts to your return electronically, so filing with numbers that do not match what the broker reported will almost certainly generate a CP2000 notice. Those notices assume you owe the maximum because the IRS does not account for your basis or deductions when generating them. Respond quickly with documentation and the issue usually clears; ignore it and penalties and interest compound on a balance you may not actually owe. If a corrected form arrives after you have already filed, you will need to amend on Form 1040-X.