Tax Forms & Reporting

Your equity comp eventually becomes boxes on a form. These guides map vest income and sales to the paperwork you will actually see.

Rates and rules change. Content is reviewed for tax year 2026. Check the last-reviewed date and methodology on each page, then confirm against IRS or state guidance before you file.

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Equity compensation eventually becomes boxes on forms: RSU vest income on your W-2, share sales on 1099-B, and basis adjustments on Form 8949. There is no separate IRS form just for RSUs.

These guides map each document to the right place on your return and explain why brokers often report incomplete basis.

Documents to have open while you read

Educational checklist — gather these before running calculators or filing. Your plan administrator may use different labels.

  • confirmation from your equity portal (date, shares, , )
  • Pay stub from the pay period ( lines)
  • for the year (Box 1 wages, state boxes if applicable)
  • for any share sales (proceeds and reported basis)
  • Broker supplemental stock plan statement or lot detail report
  • Grant agreement and schedule (for timing and grant type)
  • / exercise notice and Form 3921 if you exercised options
  • State residency dates and move records if you relocated during the year

Common filing mistakes with RSU forms

  • Double-counting or undercounting basis on 1099-B

    Vest income belongs on your W-2. The sale still belongs on Form 8949. If the broker reports $0 basis, adjust to vest FMV — do not delete the sale or assume the W-2 alone covers it.

  • Treating withholding as your final tax

    Employers often withhold at a flat supplemental rate on RSU vests. That rate is a payroll default, not a cap on what you owe for the year. Your marginal rate on stacked salary plus vest income may be higher.

  • Importing 1099-B without checking basis

    Tax software accepts broker data literally. If basis is $0, pause and pull vest FMV before you continue — otherwise capital gain may be overstated.

The usual filing flow

W-2 wages include RSU vest income. Sales go on Form 8949 / Schedule D from 1099-B data. When basis is wrong, you adjust on Form 8949 — you do not remove the sale.

When basis looks wrong

Brokers often do not know your vest wage income. Use vest confirmations to set basis to FMV at vest, then reconcile to your W-2.

Quick links

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.

W-2 vest wages vs 1099-B sale reporting on Form 8949.

Confirm any tax outcome with your documents and a qualified tax professional. See our editorial standards for how we source and update pages.

All tax forms & reporting