United States · Corporations

Stock-Based Compensation Expense: Catching Up Missed Years

Stock compensation expense is each award's grant-date fair value, spread over vesting, less awards forfeited before vesting. To catch up, value every grant since the first, build the schedule year by year and credit paid-in capital; statements already issued may need restating. The tax deduction follows the holder's taxable income and never comes for an ISO held the full periods.

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Tax year 2026 · Last updated  · Edited and reviewed by Di Lu, CPA

Who this is for

  • US corporations that granted options or restricted stock and never booked the expense
  • Startups preparing for a first audit or investor diligence

Not covered here

  • Option-pricing model inputs and accounting-policy choices in detail
  • Granting options, Form 3921 and payroll withholding on exercise
  • Deferred taxes on stock compensation in the income tax provision

How is stock-based compensation expense calculated?

Stock-based compensation expense is the fair value of each award on its grant date, recognized over the period the holder must work to earn it. US GAAP sets this out in ASC 718. The journal entry each period debits compensation expense (in the department where the person works) and credits additional paid-in capital, so total equity does not change.

The tax side runs on a different clock. The company deducts compensation only when, and to the extent, the holder is taxed on it (26 U.S.C. 83(h)). An incentive stock option (ISO) held for the full holding periods gives the company no deduction at all (26 U.S.C. 421(a)).

A catch-up is not simple when grants span several 409A valuations, people have left, advisors or contractors hold awards, founders' shares vest, or financial statements were already given to investors. Those cases turn on judgment the auditor will test.

Gather before anyone builds the schedule:

  • Board consents approving every grant, with grant dates
  • The option and stock ledger: holder, award type, shares, exercise price, vesting start and schedule
  • Every 409A valuation report and its valuation date
  • Leavers, with termination dates, and any forfeited or expired awards
  • Advisor and contractor agreements that include equity
  • Founder stock purchase agreements with vesting, and any 83(b) elections
  • Exercises, with dates, spreads and the Forms W-2 or 3921 issued

Why does the auditor want stock compensation from the first grant?

The auditor wants it because every award still vesting, or vested during the years presented, was earned by work in those years. The expense for a grant made years ago keeps landing in each year until the award fully vests. Missing grants also leave paid-in capital and the accumulated deficit wrong, and a first audit has to tie equity to the cap table. See audited financials for investors for the rest of the first-audit list.

What do we need for each grant?

Each grant needs six things: grant date, number of shares, exercise or purchase price, the vesting schedule and start date, the fair value per share of the underlying stock on the grant date, and whether the holder is an employee, advisor, contractor or founder. Option grants also need the inputs the valuation model uses. A grant whose date or terms cannot be proved from a board consent is the first thing to fix, because the grant date drives the value.

How is a grant's fair value worked out, and where does the 409A value fit?

A stock option's fair value is estimated with an option-pricing model, using the stock's fair value on the grant date, the exercise price, the expected term, expected volatility, the risk-free rate and expected dividends. Restricted stock is valued at the stock's fair value on the grant date less any price the holder pays.

The 409A value is the usual starting point for the stock's fair value, but it is an input, not the expense. Tax rules presume an independent appraisal reasonable for a grant made within 12 months after the valuation date, unless later information may materially affect the value (26 CFR 1.409A-1(b)(5)(iv)(B)). The auditor applies its own test: a grant made just before a priced round, or long after the valuation, may need a different value for the books. Setting the exercise price at the 409A value is covered in granting stock options after a valuation.

How is the expense spread over vesting, and what happens when someone leaves?

The grant's total fair value is spread over the vesting period. For awards that vest only with time, ASC 718 lets the company choose straight-line over the whole award or a front-loaded pattern that treats each vesting tranche separately; the choice is a policy applied consistently.

EventEffect on the books
Award vests on scheduleExpense continues until fully vested, then stops
Holder leaves before vestingExpense already booked for the unvested part is reversed
Vested options expire unexercisedNo reversal; the expense stays
Terms change (repricing, acceleration)Treated as a modification, which can add expense

ASC 718 also lets the company either estimate future forfeitures or record them when they happen; that is another policy choice. Repricing is covered in repricing stock options after a down round.

Are grants to advisors and contractors, and founder stock that vests, included?

Yes, awards to advisors and contractors are measured under ASC 718 like employee awards. Founder stock is in scope when it vests only if the founder keeps working: the expense is the stock's grant-date fair value less what the founder paid, which is often small for stock bought at formation.

On the tax side, advisors and contractors cannot hold ISOs, because an ISO requires an employee (26 U.S.C. 422(a)(2)); their options are nonqualified. A founder who filed an 83(b) election was taxed when the shares were issued, so any company deduction belongs to that year, not to the vesting years (26 U.S.C. 83(h)). The regulations allow no deduction at all for stock transferred to a promoter when the corporation is organized (26 CFR 1.83-6(a)(4)). The founder's side is in founder stock and the 83(b) election; early-exercised options are in early exercise of startup stock options.

How do we book the missed years: one catch-up entry or restated years?

The answer depends on whether financial statements for those years were ever issued. Build the schedule year by year either way: the expense for each grant in each year since the first grant.

SituationHow the missed expense usually lands
No financial statements were issued for the earlier yearsEach year in the first audited statements shows its own expense; earlier years go into the opening accumulated deficit
Statements were issued and the error is materialThe earlier years are restated, and the correction is disclosed
Statements were issued and the error is not materialOne adjustment in the current year may be enough

Materiality is judged by the company and tested by the auditor under the US GAAP rules for correcting errors; this page cannot settle it. Whichever way, the total recorded to date equals the schedule's total, and paid-in capital rises by the same amount. Monthly reporting going forward is covered in monthly financials for investors and the board.

Why is the stock compensation tax deduction different from the book expense?

The book expense is fixed at grant and spread over vesting. The tax deduction equals what the holder includes in income, in the company's tax year in which the holder's tax year of inclusion ends (26 U.S.C. 83(h); 26 CFR 1.83-6(a)). The amounts and years rarely match.

AwardCompany's tax deduction
ISO, shares held at least 2 years from grant and 1 year from exerciseNone (26 U.S.C. 421(a); 422(a))
ISO shares sold before those periods end (a disqualifying disposition)The ordinary income the holder reports, in the year of the sale (26 U.S.C. 421(b))
ISO exercised more than 3 months after employment ended, or above the $100,000 first-exercisable limitTreated as a nonqualified option: the spread at exercise (26 U.S.C. 422(a)(2), (d))
Nonqualified option of a private companyThe spread at exercise, in the year of exercise (26 CFR 1.83-7; Topic 427)
Restricted stock, no 83(b) electionThe value less price paid, as each block vests (26 U.S.C. 83(a), (h))
Restricted stock with an 83(b) electionThe value less price paid, at issue (26 U.S.C. 83(b), (h))

Three traps:

  • Reporting. The holder is treated as having included the amount if the company timely reports it on Form W-2 or 1099 (26 CFR 1.83-6(a)(2)). A nonqualified option spread belongs in boxes 1, 3 and 5 of the employee's W-2 and in box 12 with code V (Publication 525). For a disqualifying disposition, a W-2 or W-2c furnished and filed by the date the return claiming the deduction is filed counts as timely.
  • Disqualifying dispositions go unseen. The company often learns of an early ISO sale only if it asks; without it, the deduction is missed.
  • Capitalized costs. No deduction is allowed to the extent the compensation is a capital expenditure, a deferred expense or inventory cost, such as research costs the company must amortize (26 CFR 1.83-6(a)(4)); see deducting US software development costs.

The gap between book and tax creates deferred taxes, covered in the income tax provision for a first audit. Granting, Form 3921 and withholding on exercise are in granting stock options after a valuation.

Do Form 1120 returns already filed need changing?

Usually taxable income does not change, because the tax deduction never depended on the book expense. What the catch-up changes is the book side of the return: book income on Schedule M-1, line 1, book expense not deducted on line 5, deductions with no book expense this year on line 8, and paid-in capital on Schedule L, line 23 (Instructions for Form 1120); these schedules are not required when total receipts and total assets are both under $250,000. A corporation with total assets of $10,000,000 or more files Schedule M-3, which reports book stock option expense and the tax deduction on Part III, line 9, and restricted stock on line 10; below $50,000,000 it may complete Part I and keep Schedule M-1 instead of Parts II and III (Instructions for Schedule M-3).

Taxable income does change if the company missed a deduction it was entitled to, such as nonqualified option spreads or disqualifying dispositions. A corporation corrects a filed return on Form 1120-X, generally within 3 years after filing the original or 2 years after paying the tax, whichever is later (Instructions for Form 1120-X). For a loss company a missed deduction mostly changes the net operating loss carried forward. Whether any year is amended is the preparer's call, made year by year.

Example

These examples are illustrative; figures are in US dollars.

One grant, three years never booked

A startup grants options worth $900,000 on the grant date, vesting evenly over four years, and books nothing. No one leaves.

  • Year 1: $225,000 of expense
  • Year 2: $225,000
  • Year 3: $225,000

Three years in, $675,000 belongs in the books, with paid-in capital up by the same amount. If no statements were issued for those years, the first audited statements show each year's share; if statements went to investors, the company and auditor decide between restating and one adjustment. The remaining $225,000 is booked in year 4.

ISO exercised and held

An employee exercises an ISO while still employed, with a $50,000 spread, and keeps the shares more than 2 years from grant and 1 year from exercise. The books already carried the option's grant-date fair value over vesting. The company deducts nothing.

Nonqualified option exercised

An employee exercises a nonqualified option with an $80,000 spread. The company reports $80,000 as wages on the employee's W-2 on time and, if none of the pay must be capitalized, deducts $80,000 that year, whatever the option's grant-date fair value and whenever it was expensed in the books.

Different for you?

Figures on this page

FigureValueSource
Annual limit on ISO stock first exercisable by one employee
Aggregate fair market value, measured at grant, of stock under ISOs first exercisable in a calendar year; the excess is treated as nonqualified options
$100,000US Code: 26 U.S.C. 422(d)
Checked
Form 1120 test for skipping Schedules L, M-1 and M-2
Both total receipts (page 1, line 1a plus lines 4 through 10) and year-end total assets must be less than this amount; Schedule K, question 13. Latest final Form 1120 and instructions are for tax year 2025.
$250,000
Tax year 2025
IRS: Instructions for Form 1120
Checked
Year-end total assets requiring Schedule M-3
Nonconsolidated or consolidated total assets on the last day of the tax year. Partial completion relief may allow Schedule M-1. Latest final Form 1120 instructions are tax year 2025.
$10,000,000
Tax year 2025
IRS: Instructions for Form 1120
Checked
Year-end total assets requiring all parts of Schedule M-3
A corporation required to file Schedule M-3 with less than this in total assets at year end may complete Part I and use Schedule M-1 instead of Parts II and III
$50,000,000IRS: Instructions for Schedule M-3 (Form 1120)
Checked

Primary sources

About this guide

Edited and reviewed by Di Lu, CPA on . It explains general rules for the tax year shown. It is not advice for your situation.

Changes

  • : First published.
Di Lu, CPA
Di Lu, CPAUS and Canadian CPA

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Reviewed by Di Lu (CPA) on .