Investment and equity taxation
Tax records for RSUs, ESPPs, and employee stock options
Employee stock can create compensation from the award and gain or loss when shares are sold. Payroll and brokerage forms may show different sides.
Build the record by award lot so the W-2, employer statement, Forms 3921 or 3922, brokerage statement, and sale can be reconciled without assuming every equity plan follows the same timing.
The short version
- Identify the award type and trace each lot from grant through vesting, exercise or purchase, share delivery, and sale.
- Compare Form 1099-B basis with compensation already included in income before calculating gain or loss.
- Keep Form 3921 and ISO exercise records for the alternative minimum tax calculation and later AMT-basis tracking.
In this guide
Map the award before interpreting a tax form
Start with the plan name and award type: restricted stock units, restricted stock, an employee stock purchase plan, an incentive stock option, or a nonstatutory option. Record grant, vesting, exercise or purchase, settlement or share-delivery, and sale dates separately. Those events are not interchangeable, and the tax result can depend on plan terms and whether required holding periods were met.
Keep the grant agreement, vesting schedule, transaction confirmations, payroll supplement, and brokerage history. Track the withholding amounts separately from the shares retained or sold; the shares themselves are not a separate deduction.
Connect RSU settlement records to Form W-2
RSUs are promises to deliver stock or cash after plan conditions are met, not shares simply because an award was granted. For many common RSU arrangements, compensation is recognized when the award vests and is settled, but deferral features and other plan terms can change timing. Use the employer’s settlement statement and payroll reporting rather than applying a grant-date rule or assuming every vest date is also the delivery date.
Match the value included in wages and the related withholding to the W-2 and final pay statement. Then preserve the number of shares delivered, any shares withheld or sold, and the value used by payroll. That wage value commonly becomes part of the basis of shares received. A later sale is a separate capital transaction, even when shares were sold immediately to cover withholding.
Separate ISO, nonstatutory option, and ESPP records
An ISO exercise generally does not create regular federal income at exercise, but it can create an alternative minimum tax adjustment. Form 3921 supplies exercise dates, price, fair market value, and share count needed for that review. The later sale must be tested under the ISO rules; do not infer its treatment from the form name alone.
Most nonstatutory options without a readily determinable value create compensation when exercised, measured under the applicable rules, and the later share sale creates gain or loss. For a qualifying employee stock purchase plan, Form 3922 reports dates and values connected with the first transfer of purchased shares. ESPP and ISO sales can have ordinary-income and capital components depending on the facts, so keep the W-2 and employer supplement with each sale rather than reporting the entire difference as capital gain.
Reconcile Form 1099-B instead of copying its basis
For every sale, match Form 1099-B proceeds to the trade confirmation and identify the exact lot. Compare the broker’s basis with the purchase or exercise cost and any compensation already included in wages. IRS Publication 525 explains that broker basis for certain employee stock may omit compensation recognized in connection with the award. If that amount is ignored, the same economic income can appear once as wages and again as capital gain.
Form 8949 is designed to reconcile reported proceeds and basis with the correct return amounts and adjustments. Preserve a worksheet showing the broker-reported basis, the wage component traced to payroll, the resulting tax basis, acquisition and sale dates, and the adjustment used on the return. Do not automatically add every W-2 stock amount: the worksheet must be tied to the specific shares sold and must account for any prior sale or lot split.
Keep a second basis trail when ISO exercise affects AMT
The spread from an ISO exercise may enter the alternative minimum tax calculation even when it is not regular taxable income that year. Whether an adjustment applies depends on the exercise and disposition facts, including whether the stock was disposed of in the same year. Gather Form 3921, the exercise confirmation, the year-end share position, and every sale or transfer record for the exercised lot.
An AMT adjustment can produce a basis for AMT purposes that differs from regular-tax basis. Preserve the filed Form 6251, supporting exercise worksheet, and later disposition record so a future return can account for the difference and evaluate any minimum-tax-credit carryforward. A Form 3921 is an input to that analysis, not proof by itself that AMT is owed.
Prepare a lot-by-lot equity reconciliation
Before filing, list each award and lot with its key dates, shares, amount paid, employer-reported compensation, taxes withheld, reported sale proceeds, broker basis, corrected basis if needed, and remaining shares. Reconcile total proceeds to all Forms 1099-B and total compensation to payroll support without forcing unrelated amounts to match.
Flag a missing W-2 supplement, corrected brokerage statement, cash merger, transfer between brokers, same-day sale, or sale covering multiple lots early. Those events often require records from more than one system. A complete reconciliation supports both the current return and the eventual sale of shares still held.
Sources and further reading
Let’s work through it
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