TL;DR. Stock-based compensation (SBC) is the value of equity — usually restricted stock units or options — that companies hand to employees as pay. Under U.S. GAAP, that grant value has to be expensed on the income statement as the employee earns it. Many technology companies report a “non-GAAP” or “adjusted” earnings number that excludes SBC, which is why their press-release EPS looks materially higher than the audited GAAP figure. Warren Buffett’s response in 1998 still holds: “If options aren’t a form of compensation, what are they?” SBC is a non-cash expense, but it is not a free one — it dilutes existing shareholders, and the buybacks companies run to offset that dilution use real cash.
What stock-based compensation actually is
Stock-based compensation is the umbrella term for any pay an employee receives in the form of company equity rather than cash. The main flavors a U.S. public-company investor will encounter:
- Restricted Stock Units (RSUs). A promise to deliver shares on a future date if the employee is still around. Vesting is typically time-based (for example, 25% per year for four years), sometimes with a one-year “cliff” before the first batch vests. RSUs are the dominant form of equity pay at large U.S. public technology companies today.
- Performance Stock Units (PSUs). RSUs whose vesting depends on hitting specific performance targets — revenue, EPS, total shareholder return, or a custom metric.
- Incentive Stock Options (ISOs) and Non-Qualified Stock Options (NSOs). The right to buy a fixed number of shares at a fixed “strike” price for some period. ISOs get preferential tax treatment under the U.S. tax code but only for employees, and only up to a $100,000-per-year vesting limit. NSOs are everything else — including options granted to consultants and directors.
- Employee Stock Purchase Plans (ESPPs). Programs that let employees buy stock at a discount (typically up to 15%) through payroll deductions.
RSUs and PSUs are settled in shares (or, less commonly, cash). Options have to be exercised — the employee pays the strike price and receives the shares, hopefully when the market price is higher. From the company’s accounting standpoint, all of these are “share-based payments” and they get the same treatment.
How SBC hits the income statement: ASC 718
The U.S. accounting rule for share-based payments is FASB Accounting Standards Codification Topic 718, “Compensation — Stock Compensation” (the successor to SFAS 123R, which finally mandated expensing for public companies in 2006). Under ASC 718, a company measures the grant-date fair value of an equity award and recognizes that value as compensation expense over the vesting period — the “requisite service period” in the standard’s language. The international equivalent is IFRS 2, which works on the same fair-value-at-grant principle.
Two practical implications matter:
- Fair value is fixed at grant. The accounting expense for an RSU is the stock price on the grant date times the number of units granted, recognized over the vesting period. Subsequent stock-price moves do not change the GAAP expense (although they obviously change what the employee actually receives). For options, fair value comes from an option-pricing model — usually Black-Scholes or a lattice model, with adjustments for the early-exercise behavior of employees.
- It is non-cash but it is recurring. SBC does not leave the company as cash — the company is paying with newly created shares. But every vesting date adds shares to the share count, and most companies repeat the grant cycle every year. SBC is a permanent line item, not a one-off.
On the cash-flow statement, SBC is added back inside “cash flow from operating activities” precisely because it is non-cash. That is what creates the famous gap between GAAP net income and operating cash flow at tech megacaps: their reported earnings are after SBC; their reported operating cash flow is before it.
The non-GAAP gambit: why “adjusted” EPS excludes SBC
SEC Regulation G allows companies to publish non-GAAP financial measures alongside GAAP results, provided they reconcile the two and explain why the non-GAAP view is useful. Many U.S. technology companies use this rule to publish an “adjusted” or “non-GAAP” EPS number that excludes SBC, along with items like acquisition-related amortization, restructuring charges, and one-time legal settlements.
The argument: SBC is a non-cash expense that does not reflect ongoing operating economics, so excluding it gives a cleaner view of the underlying business. The counter-argument: SBC is recurring, real, and economically transferred to employees in lieu of cash wages — if it disappeared, the company would have to pay those same employees more cash. Treating it as a one-time adjustment systematically overstates earnings.
The SEC itself has flagged the issue. In a 2016 update to its Compliance & Disclosure Interpretations on non-GAAP measures, the staff said it would consider it potentially misleading to characterize a “normal, recurring, cash operating expense necessary to operate the registrant’s business” as non-recurring. SBC is not literally a cash expense, but the staff’s broader concern — that non-GAAP measures should not be used to make systematic, recurring costs vanish — is exactly the SBC critique.
Buffett’s framing
Warren Buffett laid out the case for treating options as a real expense in his 1998 letter to Berkshire Hathaway shareholders:
“If options aren’t a form of compensation, what are they? If compensation isn’t an expense, what is it? And, if expenses shouldn’t go into the calculation of earnings, where in the world should they go?”
Buffett’s broader point: a company that pays $100 of cash wages and a company that pays $100 of stock are economically equivalent — either way, value flows from existing owners to employees. Accounting that treats one as an expense and the other as free is incoherent.
A worked example: GAAP EPS vs non-GAAP EPS
Numbers are easier than words. Consider an illustrative technology company. The example is constructed for clarity — not pulled from any one filer — but the structure mirrors what a real tech 10-K will show.
| Line item ($ millions) | GAAP | Non-GAAP adjustments | Non-GAAP |
|---|---|---|---|
| Revenue | 10,000 | — | 10,000 |
| Operating expenses (ex-SBC) | (6,500) | — | (6,500) |
| Stock-based compensation | (1,200) | +1,200 | — |
| Acquisition-related amortization | (300) | +300 | — |
| Operating income | 2,000 | +1,500 | 3,500 |
| Tax (illustrative 20%) | (400) | (300) | (700) |
| Net income | 1,600 | +1,200 | 2,800 |
| Diluted share count (millions) | 1,000 | — | 1,000 |
| Diluted EPS | $1.60 | — | $2.80 |
In this example the company reports $1.60 of GAAP diluted EPS and $2.80 of non-GAAP EPS — a 75% gap created mostly by adding SBC back. A reader who only sees the press-release headline (“EPS of $2.80, beating consensus of $2.70”) may not realize the audited figure is 43% lower. Both numbers are real, but they answer different questions.
Dilution: the second-order effect investors miss
SBC is non-cash, but it is not “free” — the bill is paid by existing shareholders in the form of an expanding share count. When 1,200 of SBC vests in our example, the company creates new shares and delivers them to employees. Existing owners now hold a smaller percentage of the same company.
The diagram below traces the SBC lifecycle from grant to dilution to buyback offset:
Most large U.S. technology companies run share buybacks at a multiple of their SBC expense for exactly this reason — to keep diluted share count from drifting upward. Those buybacks are cash: real money leaving the balance sheet. Add the SBC expense and the cash spent to neutralize the share-count effect together, and the “non-cash” framing breaks down.
The “SBC-heavy” sectors
SBC intensity varies wildly by industry. The pattern is intuitive: businesses that compete fiercely for engineering talent and lean on equity to recruit and retain them pay more of their compensation in stock. The chart below shows the rough ordering of SBC intensity (SBC expense as a percentage of revenue) across broad sectors. Specific company numbers can be looked up in the “Stock-based compensation” footnote of any 10-K on SEC EDGAR.
How RSUs are taxed (and why holders sell on vest)
Under Section 83 of the U.S. Internal Revenue Code, an RSU recipient owes ordinary income tax on the fair market value of the shares on the date they vest. The company is required to withhold tax, and the standard mechanism is “sell-to-cover” — the broker sells a portion of the newly vested shares at the vest-date price to fund the withholding, and delivers the net shares to the employee. Subsequent appreciation or depreciation is capital gain or loss on the eventual sale.
This is why the share count on a tech company’s diluted EPS line keeps rising even when “net” vesting (gross vest minus sell-to-cover) looks smaller — the gross issuance is what counts for share-count purposes; the sell-to-cover sales are an existing-shareholder-to-IRS transaction.
Common mistakes investors make about SBC
- Treating SBC as truly non-cash and free. It is non-cash on the income statement but the company spends cash on buybacks to neutralize the share-count effect. Sum the two when evaluating real shareholder returns.
- Anchoring on non-GAAP EPS without checking the reconciliation. The reconciliation table is usually on the second page of the press release for a reason. Read it; the size of the SBC add-back tells you how much you should discount the headline.
- Comparing GAAP EPS at company A to non-GAAP EPS at company B. A surprising number of comp screens do exactly this. Use the same earnings definition for every name in a peer set.
- Ignoring SBC growth. Aggregate SBC tends to scale with headcount, not revenue. A revenue stumble plus headcount growth can produce an SBC-as-percent-of-revenue spike that pressures GAAP margins for several quarters.
- Confusing exercise of options with vesting of RSUs. The two flow through diluted share count differently — the treasury stock method dampens the in-the-money option contribution; RSUs add to diluted share count over the entire vesting period under the same method, weighted by service rendered.
What to learn next
- Diluted EPS and the treasury stock method. The mechanics of how options, warrants, and convertibles get added to the share count denominator.
- Free cash flow vs. owner earnings. An adjusted-for-SBC view of cash generation. Berkshire shareholders will recognize the framing.
- Buybacks: mechanics and math. What buybacks actually do to EPS, why they are not always shareholder-friendly, and how to tell anti-dilution buybacks from accretive ones.
- Reg G and non-GAAP disclosures. The SEC’s framework for what companies can and cannot adjust out, and the staff’s enforcement priorities.
Sources
- FASB — Accounting Standards Codification Topic 718, Compensation — Stock Compensation
- IFRS Foundation — IFRS 2 Share-based Payment
- U.S. Internal Revenue Code — 26 U.S.C. § 83 Property transferred in connection with performance of services (Cornell LII)
- SEC — Non-GAAP Financial Measures Compliance & Disclosure Interpretations
- SEC — Investor Bulletin: Non-GAAP Financial Measures
- Berkshire Hathaway — Warren Buffett’s 1998 Letter to Shareholders (options-as-compensation argument)
- SEC — EDGAR company filing search (Stock-based compensation footnotes in any 10-K)
Disclosure: This article was produced with AI assistance and reviewed before publication. It is for informational purposes only and is not investment advice.