Restricted Stock Award (RSA) vs. RSU: The Tax Difference That Can Be Worth Millions

To a hiring committee, restricted stock awards and restricted stock units look nearly identical: the executive gets company equity, it vests over time, and unvested shares are forfeited if they leave early. The offer letter might not even distinguish between them clearly.

To the IRS, they are completely different instruments. An RSA gives you actual shares at the moment of grant — property you own now, subject to a restriction. An RSU gives you a contractual promise to receive shares later — not property yet, just a right. That distinction, which reads like fine print, determines whether the Section 83(b) election is available to you. And whether 83(b) is available determines whether millions of dollars in future appreciation is taxed at 20% or 37% when you ultimately receive it.

This matters most for executives joining growth-stage companies when the current-year 409A valuation is low. If you receive an RSA when the company is worth $2 per share, an 83(b) election costs you income tax on $200,000 (on 100,000 shares at $2) today. If the company exits at $18 per share, you convert $1.6M in future appreciation from ordinary income into long-term capital gain. On that amount, the 2026 federal tax difference is $272,000 — and in California or New York, significantly more.

The structural difference: property vs. promise

A restricted stock award (RSA) is an actual transfer of shares. You become a shareholder at grant. The shares are real equity on the cap table. However, they come with a restriction — the company has the right to repurchase them at your original price (or zero) if you leave before vesting. As each tranche vests, the company's repurchase right lapses and you own those shares free and clear.

A restricted stock unit (RSU) is a contractual right to receive shares in the future — specifically, on the settlement date after the vesting condition is met. You are not a shareholder during the restriction period. You have no voting rights, no ability to sell or pledge the shares, and no cap table presence. When the RSU vests and the shares settle, they are newly issued and transferred to you at that point.

This distinction drives everything downstream:

Tax treatment without an 83(b) election

When an RSA vests (and no 83(b) election was made), and when an RSU settles, the tax treatment is identical: the fair market value of the shares on the vesting or settlement date, minus anything you paid at grant, is ordinary income in that year.¹ The employer withholds federal income tax (at the 22% supplemental rate, or 37% if the aggregate supplemental wages paid to you for the year exceed $1 million), Social Security (up to the $184,500 wage base in 2026), and Medicare.

Your basis in the shares becomes that FMV on the vest or settlement date. Any appreciation after that point — if you hold the shares rather than selling immediately — is a capital gain. Hold more than one year after vesting and it becomes a long-term capital gain, taxed at 15% or 20% plus 3.8% NIIT for most executives.

From this baseline, RSAs and RSUs are economically equivalent. The difference only appears when you layer in the 83(b) election for RSAs.

The Section 83(b) election: what it is and how it changes the math

Section 83(b) of the Internal Revenue Code allows the recipient of property subject to a forfeiture risk to elect to include the property's value in income immediately — at grant — rather than waiting until the restriction lapses.² For an RSA granted when the company 409A value is $2 per share, that means recognizing income on $2 of value now. If the company later exits at $18 per share, the remaining $16 of appreciation was already "owned" (your holding period started at grant), and it is taxed as long-term capital gain — not ordinary income.

For RSUs, there is no equivalent. The Supreme Court and IRS have consistently held that the 83(b) election applies to property already transferred — not to a contractual promise to receive property in the future. Because RSU holders are not shareholders and have no property at grant, there is nothing to elect on.

The 30-day deadline — and why it's absolute

The 83(b) election must be filed with the IRS within 30 days of the date of the property transfer — the grant date, not the vesting date. This deadline is statutory and the IRS does not grant extensions.³ If you miss the 30-day window, you lose the election permanently on that grant. There is no cure.

The filing requirements:

• File a signed written statement (or IRS Form 15620, issued 2024) with the IRS service center where you file your return
• Attach a copy to your income tax return for the year of the election
• Provide a copy to the company (your employer)
• File within 30 days of the grant date — postmark date controls

The election statement must identify: your name and address, the description of the property, the date of transfer, the tax year of transfer, the nature of the restriction on the property, the property's fair market value at transfer (ignoring lapse restrictions), and the amount paid for the property (usually zero or a nominal exercise price).

The downside risk: forfeiture after an 83(b) election

If you file an 83(b) election and later forfeit the shares — you leave before vesting, or the company claws back the award — you do not get the tax back. You recognized ordinary income at grant and paid tax on it. The forfeiture gives you a capital loss equal to the amount paid for the shares (usually zero), not a deduction for the ordinary income previously recognized.⁴

This asymmetry is the risk. An 83(b) election is a bet that:

1. You will not forfeit the shares
2. The company will be worth meaningfully more than the grant-date 409A value when you eventually sell

If either bet proves wrong — you leave before full vesting, or the company stagnates or fails — you've paid tax on income you never ultimately received (or received at a lower value). For executives with high confidence in both the company's trajectory and their own tenure, the math strongly favors filing. For executives with meaningful uncertainty about either, the calculus shifts.

Section 409A and RSUs: the short-term deferral exception

Because RSUs are a promise to pay in the future, they technically constitute nonqualified deferred compensation subject to IRC § 409A — the same rules that govern NQDC plans with their strict election and distribution requirements.⁵ A § 409A violation on RSUs could trigger immediate income inclusion on the full value of the outstanding units plus a 20% excise tax.

In practice, almost all RSU plans at large companies avoid this exposure through the short-term deferral exception: if the shares settle (are delivered to the executive) by the 15th day of the third month following the end of the tax year in which vesting occurs, the arrangement is not treated as deferred compensation. A grant vesting on March 1, 2026 must settle by March 15, 2027 to qualify. Most corporate RSU plans are designed exactly this way.

RSAs, by contrast, are not NQDC at all. They're property under § 83, and § 409A expressly excludes property transfers governed by § 83. This means RSAs face no § 409A design constraints — the restriction/forfeiture period can be structured however the plan document specifies, without the 6-distribution-event limitation or anti-acceleration rules that constrain NQDC.

S-corporation and LLC limitations

For executives at S-corporations or LLC-structured companies, the RSA vs. RSU choice is further constrained by entity-level rules.

S-corporations: S-corps can only have one class of stock (Treasury Regs § 1.1361-1(l)). An RSA issued to an executive is treated as outstanding stock — adding the executive as a shareholder immediately. Provided the RSA has the same economic rights as other shares (same liquidation and distribution preferences), this doesn't violate the one-class rule. RSUs, however, can create ambiguity: a promise to issue shares in the future may be treated as a second class of stock if it has different economic characteristics — potentially terminating S-corp status. Most S-corp advisors prefer RSAs (with § 83(b) elections) or phantom stock over RSUs for this reason.

LLCs (taxed as partnerships): Neither RSA nor RSU translates cleanly into a partnership structure. LLC interests don't have the same "shares" mechanics as corporate stock. The equivalent instrument is a profits interest, which under Rev. Proc. 93-27 produces no income at grant and converts future appreciation to long-term capital gains at exit — achieving a similar economic result to an RSA with § 83(b), but through partnership law rather than corporate law.

QSBS eligibility

For executives at early-stage C-corporations, the RSA-with-83(b) combination is also the path to QSBS (Qualified Small Business Stock) exclusion under IRC § 1202. QSBS eligibility requires holding originally issued stock — not units or contractual rights — in a qualified small business C-corp with gross assets under $50M at the time of issuance. Because an RSA is a transfer of actual stock at grant, the § 1202 holding period and eligibility clock starts at the grant date. RSU recipients do not receive "originally issued stock" until settlement, which may be years after the company has grown past the $50M gross assets threshold.

Post-OBBBA (July 2025), the QSBS exclusion is tiered: 50% at 3 years, 75% at 4 years, 100% at 5 years, with a $15M per-issuer exclusion cap. For an executive who files an § 83(b) election at grant on an RSA from a company that later exits in a qualifying sale, this can eliminate federal tax entirely on up to $15M of gain.⁶ See the QSBS planning guide for the full analysis.

The planning summary: which to choose and what to do

1. IRC § 83(a) — property transferred in connection with performance of services included in gross income at time restrictions lapse, equal to excess of FMV over amount paid. 26 U.S.C. § 83.
2. IRC § 83(b) — election to include property in income in the year of transfer (grant). Value computed ignoring restrictions other than those that will never lapse. Election must be filed within 30 days of transfer. 26 U.S.C. § 83(b). IRS Form 15620 (Section 83(b) Election) published 2024.
3. Treas. Reg. § 1.83-2(b) — 30-day election period. No extensions. Attachment to tax return required. 26 CFR § 1.83-2.
4. Treas. Reg. § 1.83-2(a) — if property forfeited after § 83(b) election, no deduction for ordinary income previously recognized; only capital loss for amount paid. 26 CFR § 1.83-2(a).
5. IRC § 409A and Treas. Reg. § 1.409A-1(b)(4) — short-term deferral exception: compensation is not deferred compensation if paid by the 15th day of the third month following the end of the service recipient's taxable year in which vesting occurs. RSU plans structured to settle within this window avoid § 409A entirely. IRS § 409A FAQ.
6. IRC § 1202 — QSBS exclusion. Post-OBBBA (One Big Beautiful Bill Act, July 2025): tiered 50%/75%/100% exclusion at 3/4/5-year holding, $15M per-issuer cap. Requires C-corp, originally issued stock, active business, gross assets ≤ $50M at issuance. 26 U.S.C. § 1202.

Tax rates verified against IRS Rev. Proc. 2025-32 (2026 tax year). LTCG rates: 0% to $98,900 (MFJ); 15% to $613,700 (MFJ); 20% above. NIIT 3.8% on net investment income above $250K (MFJ). Social Security wage base $184,500 for 2026 per SSA. OBBBA provisions effective July 2025. Values verified June 2026.