How to Read a Brokerage 1099 in 2026

How to Read a Brokerage 1099 in 2026: Dividends, Cost Basis, Wash Sales, and Tax Forms

A brokerage 1099 can run dozens or even hundreds of pages, but most investors need to focus on a short list of items: dividends, interest, sale proceeds, cost basis, holding periods, withholding, and adjustments such as wash sales.

This guide covers brokerage statements delivered in 2026 for investment activity during the 2025 calendar year. That reporting cycle is now in the past, but the same review process remains useful when checking a filed 2025 return, responding to a corrected form, or preparing records for an amended return.

If you are organizing taxes in late 2026, remember that transactions occurring during the 2026 calendar year will generally appear on tax forms furnished in early 2027. Digital-asset basis reporting also changes for certain 2026 transactions, as explained below.

This article provides general educational information for U.S. taxpayers. It is not personalized tax, financial, or legal advice.

What a Brokerage 1099 Covers

Many brokerage firms issue a consolidated 1099 instead of sending several unrelated forms. A consolidated statement may combine:

• Form 1099-DIV: Dividends and distributions from stocks, mutual funds, exchange-traded funds, and certain other investments.
• Form 1099-INT: Taxable interest, U.S. Treasury interest, and related withholding.
• Form 1099-B: Proceeds from reportable sales of stocks, funds, bonds, options, and other securities.
• Form 1099-OID: Original issue discount from certain bonds and debt instruments.
• Supplemental schedules: Foreign-source income, state tax details, transaction records, and year-end account summaries.

Each taxable brokerage account may generate a separate statement. If you held three individual brokerage accounts, for example, you may have received three 1099 packages even if all three accounts were at the same firm. Joint accounts, trust accounts, and accounts registered under different taxpayer identification numbers may also have separate forms.

Taxable accounts should be distinguished from retirement accounts. Transactions inside most traditional IRAs, Roth IRAs, and employer retirement plans do not produce annual Forms 1099-DIV or 1099-B. A distribution from a retirement account may instead be reported on Form 1099-R. Retirement-account purchases can still matter when evaluating wash sales involving a taxable account.

How to Read Form 1099-DIV for Dividends

Form 1099-DIV separates distributions by tax category. Do not treat every dividend as though it receives the same federal tax treatment.

Box 1a: Total Ordinary Dividends

Box 1a reports total ordinary dividends. It generally includes both qualified and nonqualified dividends. Box 1b is usually a portion of Box 1a, not an additional amount that should be added to it.

Box 1b: Qualified Dividends

Box 1b shows the portion of Box 1a identified as qualified dividends. That portion may be eligible for federal long-term capital-gain tax rates if the applicable holding-period and other requirements are satisfied.

Tax software typically requests both amounts. Entering only Box 1b can underreport total dividend income, while adding Boxes 1a and 1b together can overstate it.

Box 2a: Capital-Gain Distributions

Box 2a reports total capital-gain distributions, commonly paid by mutual funds and ETFs. You can receive a taxable capital-gain distribution even when you did not sell any fund shares yourself. These distributions are generally treated as long-term capital gains, subject to any special amounts shown in the other Box 2 fields.

Boxes 7 and 11: Foreign Tax and Exempt Interest

Box 7 reports foreign tax paid. Depending on the taxpayer’s circumstances, this amount may support a foreign tax credit or an itemized deduction. Supplemental pages may identify the associated countries and income categories.

Box 11 reports exempt-interest dividends, often from funds that hold municipal bonds. The amount may be exempt from federal income tax, but it still must be reported. State treatment can differ, particularly when a fund owns bonds issued outside the investor’s home state.

Reconcile Reinvested Dividends

A dividend does not become nontaxable merely because it was automatically reinvested. If a fund distributes $400 and uses the money to buy additional shares, the $400 may appear on Form 1099-DIV. The reinvested amount generally becomes cost basis in the newly purchased shares.

Compare the dividend totals with the account’s activity history. Include cash dividends, automatic reinvestments, and year-end fund distributions. This review can also identify a distribution recorded under an unfamiliar transaction description.

How to Read Form 1099-INT and Other Interest Income

Keep interest separate from dividends and capital gains because each category is reported differently on the tax return.

• Box 1: Taxable interest reported by the broker, potentially including interest from cash balances, certificates of deposit, or certain bonds.
• Box 3: Interest on U.S. Treasury obligations. It is generally taxable federally but may receive different treatment for state and local income taxes.
• Box 4: Federal income tax withheld under backup-withholding rules.

Review the brokerage’s state-specific supplemental information before preparing a state return. The package may provide Treasury-income percentages or other details needed to calculate the amount eligible for state treatment.

When Form 1099-OID Appears

Form 1099-OID reports original issue discount on certain debt instruments issued below their redemption value. OID may be taxable as it accrues even when the investor did not receive an equal amount of cash during the year.

Bond reporting can become more complicated when market discount, acquisition premium, tax-exempt OID, or taxpayer elections are involved. In those cases, the supplemental bond schedule can be as important as the numbered boxes.

How to Read Form 1099-B and Cost Basis

Form 1099-B reports securities sales and other reportable dispositions. A consolidated statement commonly divides transactions into short-term and long-term sections, then separates them according to whether cost basis was reported to the IRS.

Important Form 1099-B Boxes

• Box 1b: The acquisition date for many covered securities.
• Box 1d: Gross proceeds from the sale or exchange, determined under the applicable broker-reporting rules.
• Box 1e: Cost or other basis when the broker reports it.
• Box 1g: Wash-sale loss disallowed by the broker.
• Box 2: Whether the transaction is classified as short term or long term.
• Box 4: Federal backup withholding, if any.
• Box 5: Indicates a noncovered security when checked.

A security is generally short term when held for one year or less and long term when held for more than one year, although special rules can apply. The classification matters because net long-term capital gains may qualify for different federal rates than short-term gains.

Covered Versus Noncovered Securities

For a covered security, the broker is generally required to report basis and related information to both the taxpayer and the IRS. For a noncovered security, Box 5 may be checked and basis may be omitted or shown only as supplemental information.

Missing basis does not mean the basis is zero. The taxpayer remains responsible for establishing the correct amount using purchase confirmations, prior statements, transfer records, reinvestment history, and corporate-action documents.

How Basis Methods Affect the Result

If you purchased multiple lots of the same investment at different prices, the selected basis method determines which shares are treated as sold:

• FIFO: First in, first out treats the oldest available shares as sold first.
• Specific identification: The investor identifies particular tax lots within the required timeframe and obtains broker confirmation.
• Average cost: Commonly available for eligible mutual-fund shares and certain dividend reinvestment plan shares.
• Other broker methods: Some firms offer highest-cost, lowest-cost, or tax-sensitive disposal instructions, subject to applicable rules.

Box 1e shows the basis assigned to a sale; it does not identify the broker’s basis method. Check account settings and trade confirmations to verify which lots were used. A desired lot selection may not be available after the broker’s identification deadline has passed.

Wash Sales: What Box 1g Means

A wash sale generally occurs when an investor sells stock or securities at a loss and acquires the same or substantially identical stock or securities within 30 days before or after the sale. That creates a 61-day testing period centered on the loss sale.

Box 1g reports the wash-sale loss disallowed by the broker for the transaction. In a typical taxable-account wash sale, the disallowed loss is generally added to the replacement shares’ basis. The holding period may also carry over, so the loss is deferred rather than immediately deducted.

Example: A Partially Disallowed Loss

Assume an investor sells shares for a $500 economic loss. The investor replaces only part of the position during the wash-sale period, and the broker reports $300 in Box 1g.

• Loss before the wash-sale adjustment: $500
• Loss disallowed and deferred: $300
• Remaining currently recognized loss: $200
• Amount generally added to affected replacement shares’ basis: $300

The precise Form 8949 presentation depends on how proceeds and basis appear on Form 1099-B. Do not apply the Box 1g amount twice if the broker’s tax data or software import has already included the adjustment.

Why Broker Wash-Sale Reporting May Be Incomplete

Box 1g is a starting point, not necessarily the taxpayer’s complete wash-sale calculation. A brokerage may not capture relevant replacement purchases made:

• At another brokerage firm;
• In a different taxable account owned by the investor;
• Through a spouse’s account when the applicable rules require it to be considered;
• In an IRA or another retirement account; or
• In an investment the broker does not match even though it may be substantially identical under the tax rule.

A replacement purchase in an IRA can receive different and potentially less favorable treatment than a replacement purchase in a taxable account. Seek professional guidance when retirement and taxable accounts overlap.

Year-end trades require particular attention. A loss sale in December 2025 could become a wash sale because of a repurchase in January 2026. The January transaction would not appear in the 2025 trade history, so the original 2025 statement might not show the complete adjustment.

How 1099 Information Moves to Your Tax Return

Dividend and interest amounts generally flow to Form 1040 and supporting schedules when required. Capital transactions are typically reported through Form 8949 and Schedule D.

Form 8949 and Schedule D

Form 8949 organizes sales by holding period and by whether basis was reported to the IRS. A transaction may require proceeds, basis, an adjustment code, and an adjustment amount. Schedule D then summarizes short-term and long-term results.

Summary reporting directly on Schedule D may be permitted for certain transaction groups when basis was reported to the IRS and no adjustments are needed. Transactions with wash sales, missing or incorrect basis, nondeductible losses, or other adjustments may require Form 8949 detail or an acceptable attached statement.

Reconcile the following for each sales category:

• Total proceeds;
• Total cost or other basis;
• Short-term or long-term classification;
• Wash-sale amounts;
• Market-discount and other adjustments; and
• Applicable Form 8949 adjustment codes.

Federal backup withholding shown on Forms 1099-DIV, 1099-INT, or 1099-B is reported as a federal tax payment. It is not an investment-income deduction. Retain the statement to support the payment claimed on the return.

2026 Deadlines, Corrections, and Filing Checklist

For historical context, many 2025 brokerage statements were furnished in mid-February 2026. February 17, 2026, was a commonly applicable recipient-statement deadline for 2025 Form 1099-B reporting because of the weekend and federal holiday calendar. That deadline has passed and should not be used as the deadline for forms covering 2026 transactions.

Statements for 2026 investment activity will generally be furnished in early 2027 under the deadlines applicable to that reporting cycle. Brokers may release some forms earlier or wait for updated information from funds and other security issuers before completing a consolidated package.

Review Corrected 1099s Carefully

Mutual funds, real estate investment trusts, partnerships, and other issuers sometimes revise the tax classification of distributions after an original statement is prepared. A broker may then issue a version marked “Corrected.”

Compare the corrected statement with the original before filing or amending a return. A revision can change qualified dividends, capital-gain distributions, foreign tax, basis, or transaction classifications. If the original return has already been filed, ask a qualified tax professional whether the correction requires an amended return.

Check for Form 1099-DA

Form 1099-DA reporting began with applicable digital-asset transactions effected during 2025, with recipient forms furnished in early 2026. For that first reporting year, brokers were required to report gross proceeds but were not required to report cost basis. Taxpayers still had to determine basis and calculate the resulting gain or loss.

Mandatory broker basis reporting begins for covered digital assets sold in transactions effected on or after January 1, 2026. Those 2026 transactions will generally appear on forms furnished in early 2027. Basis may remain absent for noncovered assets or in circumstances where the broker does not have the required acquisition information.

Maintain independent records of purchase dates, acquisition costs, transaction fees, transfers between brokers or wallets, and sale proceeds. A proceeds-only Form 1099-DA is not enough by itself to calculate taxable gain or loss.

Brokerage 1099 Filing Checklist

1. Download the consolidated 1099 for every taxable brokerage account.
2. Confirm the tax year shown on each statement.
3. Reconcile dividends, interest, and reinvested distributions with account activity.
4. Compare Form 1099-B transactions or summary categories with the full trade history.
5. Investigate missing basis, unfamiliar sales, and incorrect acquisition dates.
6. Check year-end loss sales against purchases made during the complete 61-day wash-sale window.
7. Review activity across brokerage firms, relevant spousal accounts, and retirement accounts.
8. Enter backup withholding as a federal tax payment.
9. Look for corrected forms before filing or amending a return.
10. Retain statements, confirmations, basis records, and adjustment calculations with the return records.

What to Do Next

If you are reviewing the 2025 reporting cycle, download every form furnished in 2026 along with the complete 2025 transaction history. Reconcile income totals first, then match proceeds, basis, holding periods, and wash-sale adjustments. Compare any corrected statement against both the original form and the filed return.

For the 2026 tax year, start organizing records before forms arrive in early 2027. Preserve basis information for transferred securities and digital assets, review December loss sales against January repurchases, and keep records from every brokerage and wallet.

Missing basis, multi-account wash sales, retirement-account repurchases, digital-asset transfers, and corrected statements can require additional analysis. A qualified tax professional can help determine the proper reporting treatment and whether a previously filed return should be amended.