Your 1099-B shows large proceeds from selling RSU shares and tax software wants to tax the full amount — or you received an IRS notice matching proceeds without basis. You need to separate sale proceeds from taxable capital gain after vest FMV basis.
Start here
What you need before using this
- for sale with proceeds and basis boxes.
- confirmation for sold lot.
- from year showing wages.
- Tax software import preview before filing.
- calculator or 8949 worksheet.
Broker proceeds reporting is gross sale price. Correct basis comes from vest records, not 1099-B alone.
Why this happens
Brokers report gross proceeds to IRS on Box 1d — IRS matching programs compare proceeds to return.
Proceeds include return of your basis ( ) plus any price change after .
Zero basis on makes software think gain equals proceeds — common reporting error.
already taxed as wages — basis adjustment on Form 8949 removes that portion from .
CP2000 notices sometimes propose tax on full proceeds when basis missing from return.
Short-term gain is proceeds minus basis when held one year or less from .
Long-term gain uses same basis math with lower rates on eligible gain.
Multiple lots need proceeds and basis per lot — not one blended rate.
at may produce small proceeds with basis near — gain near zero.
Wash sale rules rarely apply to typical lot sales — separate analysis for repurchases.
Proceeds in tax software flow to Form 8949 then Schedule D — basis column is critical.
Broker supplemental statements may show employer failed to transmit.
Gift or transfer of shares after changes basis tracking — original employee uses .
State tax follows federal gain amount after correct basis — not raw proceeds.
Amended returns fix proceeds-overtaxed when basis omitted on original 8949.
What to check
- proceeds vs shares sold times sale price.
- Basis equals times shares from confirmation.
- Gain equals proceeds minus basis on Form 8949.
- year includes that in wages.
- Software did not import zero basis uncorrected.
- Adjustment code and column per Form 8949 instructions.
- Schedule D gain matches sum of 8949 lines.
- No duplicate wage reporting of same on sale line.
Paying tax on 1099-B proceeds instead of proceeds minus basis
What to check in your documents
- proceeds and basis boxes.
- confirmation for sold lot.
- Form 8949 with basis adjustment.
- Schedule D total gain.
- Box 1 for year.
$10,000 proceeds, $9,500 basis
Illustration only, not your tax situation.
Questions people ask
- Are 1099-B proceeds taxable income for RSUs?
- Not in full — taxable gain is proceeds minus basis. Basis is generally already on .
- Why does 1099-B show huge proceeds on RSU sale?
- Proceeds are gross sale price. Most of that may be return of basis, not gain, when basis is entered correctly.
- 1099-B proceeds vs W-2 RSU wages?
- reports wages. reports sale. Basis links them — same should not tax twice.
- IRS notice on full 1099-B proceeds?
- Often missing basis on return. Respond with Form 8949 basis adjustment and documentation.
- Proceeds vs gain in TurboTax for RSU?
- Enter or adjust basis so software computes gain, not proceeds alone. See TurboTax guide.
- Zero basis — is gain equal to proceeds?
- Only if basis is truly zero — basis is usually , not zero.
- Sell-to-cover proceeds on 1099-B?
- May show small gain or loss if sale price differs slightly from used as basis.
- Which forms show proceeds vs gain?
- proceeds; Form 8949 and Schedule D show gain after basis.
- Tools to compute gain from proceeds?
- calculator and adjustment helper.
- Related guides?
- calculation, Form 8949 codes, are taxed twice, Schedule D sales.
When to get help from a tax pro
- IRS notice taxing full proceeds with no basis adjustment accepted.
- Corporate action changed share count and proceeds do not match lots.
- Multiple brokers reporting same sale.
- International tax reporting on U.S. .
Related calculators
- RSU Cost Basis Calculator
Cost basis on sold RSUs usually ties back to vest FMV already taxed as wages — this tool helps you model that link.
- 1099-B RSU Adjustment Helper
Structured helper for RSU 1099-B problems — zero basis, duplicate wage reporting, and supplemental plan lot details.
- RSU Sale Tax Calculator
Estimate capital gain tax on RSU share sales using vest FMV as basis — separate from vest wage tax already on your W-2.
Related pages
- How to Calculate RSU Cost Basis
RSU cost basis is generally vest FMV per share already taxed as wages — proceeds minus that basis is capital gain on Form 8949.
- Form 8949 Adjustment Codes for RSU Sales
RSU sales with missing 1099-B basis use Form 8949 adjustment codes per IRS instructions — enter vest FMV as basis adjustment before Schedule D.
- Are RSUs Taxed Twice?
Vest income and later sales can both show up on tax forms — that is not always double tax on the same dollars.
- Schedule D for RSU Sales
RSU sales go on Form 8949 and Schedule D with basis tied to vest wage income — separate from W-2 vest reporting but connected through cost basis.
- RSUs on 1099-B: What to Look For
1099-B for RSUs often shows low or zero basis — that does not mean your true basis is zero.
- CP2000 Notice for Equity Compensation
CP2000 notices often flag 1099-B proceeds without matching basis — common when RSU sales report $0 cost basis despite vest wages on W-2.
Sources and notes
Primary tax claims on this page are supported by the official and secondary sources below. Broker and software links describe reporting mechanics — confirm rules against IRS or state guidance.
1099-B proceeds vs capital gain after vest FMV basis on RSU sales.
- About Form 1099-B — Proceeds from Broker and Barter Exchange Transactions
Internal Revenue Service · Official
Broker reporting of sales proceeds and basis; basis on 1099-B may be incomplete for equity-compensation shares.
- IRS Publication 525 — Taxable and Nontaxable Income
Internal Revenue Service · Official
Covers compensation income from stock-based pay, including restricted property under section 83.
- Filing taxes for restricted stock, RSUs, or performance awards (tax guide PDF)
Fidelity Stock Plan Services · Brokerage explainer
Explains W-2 vest income, 1099-B with $0 basis, supplemental adjusted cost basis, and Form 8949 reporting.
For learning, not filing
VestingTax.com is not a CPA firm or tax preparer. Grants, employers, and states all differ. Use the cited IRS and state sources above, your own documents, and a qualified tax professional before you make decisions from this guide.