Restricted Stock Awards (RSAs): Tax Treatment, 83(b) Election & QSBS Guide 2026

For startup founders, early employees, and executives with RSA grants. Not tax or investment advice — your grant price, vesting schedule, and company stage change everything.

What is a restricted stock award?

A restricted stock award (RSA) is a grant of actual company shares that are subject to forfeiture — typically through a repurchase right the company holds at cost (or occasionally at FMV) if you leave before the shares vest. Unlike stock options, you own the shares from day one. Unlike RSUs, the company delivers the shares immediately rather than promising to deliver them at a future date.

RSAs are most common at:

• Seed and Series A startups granting equity to founders and very early employees
• Companies using restricted stock instead of options to start the QSBS and long-term capital gain holding period as early as possible
• Situations where the strike price (409A FMV) is low enough that purchasing shares immediately makes financial sense
• Advisor and consultant grants structured as restricted stock rather than options

The grant documents for an RSA will typically include a stock purchase agreement (showing the purchase price you pay), a restricted stock award agreement (showing the vesting schedule and repurchase terms), and the company's equity incentive plan.

RSA vs. RSU vs. ISO: Key differences

How RSAs are taxed

Without an 83(b) election

Under the default IRC §83(a) rule, you recognize ordinary income each time restricted property becomes substantially vested — meaning each time a tranche of shares escapes the company's repurchase right.² The taxable amount is:

Ordinary income per vesting date = (FMV on vesting date − amount you paid for the shares) × number of shares vesting

This income is subject to FICA payroll taxes — Social Security at 6.2% on wages up to $184,500 (2026 wage base³), Medicare at 1.45%, and Additional Medicare Tax at 0.9% on wages above $200,000. Your employer reports the spread on your W-2.

The tax problem: as a startup grows, the FMV at each vesting date rises sharply. You owe income tax on unrealized gains in illiquid private company stock — with no market to sell shares to cover the bill.

With an 83(b) election filed at grant

Under IRC §83(b), you can elect to recognize income at the time of grant instead of at vesting.⁴ The taxable amount is:

Ordinary income at grant = (FMV on grant date − amount you paid) × total shares

For most early-stage RSA grants, the purchase price equals the 409A FMV on the grant date, so the spread is $0 — and you owe zero income tax. You've locked in your cost basis at today's low price. All future appreciation is capital gain, not ordinary income.

After filing an 83(b), you pay no tax at each vesting event. When you eventually sell, you pay capital gains tax on the difference between the sale price and your original purchase price (plus any income recognized at the 83(b) election date).

The 83(b) deadline: 30 days, no exceptions

The 83(b) election must be filed with the IRS within 30 calendar days of the grant date. The IRS does not grant extensions for any reason — not illness, not administrative delays, not failure to receive legal advice in time.⁴ Missing the deadline by a single day means you lose the election permanently for that grant.

Since November 2024, the IRS has a dedicated form: Form 15620 (Section 83(b) Election). This replaced the informal letter-filing method that existed under prior revenue procedures. File via certified mail or electronically. You do not attach it to your tax return (the requirement to attach was eliminated by T.D. 9779).

See the 83(b) Election Decision Guide for the complete filing mechanics and the 83(b) Election Calculator to model your specific numbers.

Worked example: the cost of skipping the 83(b)

Suppose you're an early employee at a Series A startup. The company grants you 500,000 RSA shares at a 409A price of $0.50/share. You pay $250,000 for the shares. The grant has a 4-year vest with a 1-year cliff.

Without an 83(b) election, you owe over $2 million in income tax across four years on stock in a private company you cannot sell. Each year you must find cash to pay the bill — while still holding illiquid shares.

With an 83(b) election filed within 30 days of grant: The spread at grant is $0.50 − $0.50 = $0 per share. Ordinary income at grant: $0. No FICA. No cash out of pocket. The entire $12.5M value when you eventually sell ($25 × 500,000) becomes a capital gain on a $250,000 cost basis.

If shares are sold after 5 years, the $12.25M gain is long-term capital gain — and if the company qualifies as QSBS, up to $15M may be federally excluded entirely.

RSAs and QSBS: the most powerful stacking strategy in startup equity

Qualified Small Business Stock (§1202) can exclude up to $15M of gain from federal tax (post-OBBBA, for stock issued after July 4, 2025).⁵ The exclusion requires a 5-year holding period measured from when you acquired the stock.

For RSAs with a timely 83(b) election:

• The holding period begins on the grant date, not on each vesting date
• You can reach the 5-year QSBS mark while you're still at the company — without waiting for all shares to vest
• The QSBS clock runs concurrently with the vesting schedule

For RSAs without an 83(b) election:

• Each tranche's holding period starts on the vesting date of that tranche
• Your Year 4 cliff shares don't begin their 5-year QSBS clock until Year 4
• Those shares won't hit the QSBS exclusion until Year 9 from grant

Using the example above: with an 83(b) filed at grant, all 500,000 shares begin their QSBS clock on day one. If you sell 5+ years from grant at $25/share, the entire $12.25M gain is potentially excluded from federal tax — saving approximately $2.9M compared to paying the 23.8% long-term rate (20% LTCG + 3.8% NIIT).

Key QSBS requirements that must also be met (see the full QSBS guide for details):

• Company must be a domestic C-corp with $75M or less in gross assets at time of issuance (and assets didn't exceed $75M before the shares were issued)
• Shares must be original issuance (not bought in secondary market)
• Company must be in a qualified trade or business (SIC-based exclusions: hotels, restaurants, health, law, finance, consulting, certain other services)
• OBBBA tiered exclusion (post-July 4, 2025 stock): 50% at 3 years, 75% at 4 years, 100% at 5 years

What happens to RSA shares if you leave the company?

The company retains a repurchase right for unvested shares. When you leave, the company typically exercises that right and buys back your unvested shares at the original purchase price (the 409A price at grant). You receive your original investment back, not the current FMV.

If you filed an 83(b) election, the tax consequences are:

• The repurchased (forfeited) shares generate a capital loss, not an ordinary income deduction — you cannot recover the income taxes you did not pay (because you recognized $0 at grant)
• The loss is a short-term or long-term capital loss depending on how long you held the shares
• If you paid $50,000 for shares that were repurchased at $50,000, your loss is $0

If you did NOT file an 83(b) election, unvested shares that are repurchased create no taxable event (you never recognized income on them). You recover exactly the purchase price, and no loss arises.

The key RSA risk: if you paid material cash for shares and forfeit them before vesting, the 83(b) election does not cost you additional tax — but it does not save you from the loss of your investment either. This is why 83(b) elections make sense when (1) the purchase price is low (par value or low 409A), (2) the vesting risk is modest, and (3) there's meaningful upside potential.

RSAs at public companies

RSAs exist at some public companies, though they are far less common than RSUs in public-company compensation packages. At public companies, the RSA grant price typically equals the market price on the grant date, making the 83(b) election less valuable (the spread at grant is already the same as at vesting if no growth occurs before cliff). More importantly, QSBS does not apply to public companies, eliminating the most powerful reason to file an 83(b) on an RSA.

At public companies, RSAs without 83(b) function similarly to RSUs: ordinary income at vesting, no AMT, employer withholds at the 22% supplemental rate. If you hold the shares after vesting, subsequent appreciation is long-term capital gain after 12 months.

FICA and withholding mechanics

For RSAs without an 83(b) election, each vesting tranche creates a W-2 income event. Your employer withholds:

• Federal income tax at the 22% supplemental rate (37% on supplements above $1M in a year)
• Social Security: 6.2% on the first $184,500 of combined wages in 2026³
• Medicare: 1.45% with no cap
• Additional Medicare Tax: 0.9% on wages over $200,000 (single) / $250,000 (MFJ)

The 22% federal withholding is almost always insufficient for senior employees in the 32–37% bracket. You'll likely owe additional estimated taxes. The withholding gap problem is the same as with RSUs — see the RSU tax guide for the mechanics.

For RSAs with an 83(b) election at $0 spread, no withholding is required at grant (no W-2 income to report). Your employer may still need to track the grant for compliance purposes, but there is no payroll withholding event.

Planning framework: when does the 83(b) make sense for an RSA?

The 83(b) is almost universally the right choice for founders receiving RSA grants at par value ($0.0001/share) at company inception. For early employees buying at a real 409A price that could be a meaningful amount, the decision depends on vesting confidence, company trajectory, and cash available.

Sources

1. RSUs cannot be the subject of an 83(b) election — the IRS has ruled that RSUs have no ascertainable FMV at grant and therefore no property to elect on. IRS Notice 2005-1, Q&A 9. IRS Notice 2005-1 (PDF)
2. IRC §83(a) — property transferred in connection with performance of services; recognition at substantial vesting. 26 U.S.C. §83 (Cornell LII)
3. 2026 Social Security wage base: $184,500. SSA.gov — Contribution and Benefit Base
4. IRC §83(b) election; 30-day filing requirement. Form 15620 introduced November 2024. T.D. 9779 eliminated requirement to attach to return. IRS — About Form 15620
5. QSBS §1202 exclusion — OBBBA (One Big Beautiful Bill Act, July 2025): $15M cap, tiered 50/75/100% exclusion at 3/4/5 years for stock issued after July 4, 2025. 26 U.S.C. §1202 (Cornell LII)
6. 2026 long-term capital gains rates: 0% up to $49,450 (single) / $98,950 (MFJ); 15% up to $545,500 (single) / $614,500 (MFJ); 20% above. NIIT 3.8% above $200,000 (single) / $250,000 (MFJ). IRS Rev. Proc. 2025-32.

Values verified as of June 2026. Tax law changes frequently — verify current-year limits before making grant decisions.