Stock-based compensation, a real cost, worked
Stock-based compensation (SBC) is pay in shares or options instead of cash. Under US GAAP it is expensed at the award's grant-date fair value over the vesting period, but it uses no cash, so it is added back on the cash flow statement. In a valuation, treat it as a real cost: either keep it in as an expense, or add it back and count the shares it will create. In our DCF example, adding it back and ignoring the dilution overstates value by $1,000 million. Soreno, an AI voice interview practice app for consulting, investment banking and other finance candidates, runs a free DCF model template with no sign-up, and mock technical interviews where an AI interviewer asks whether you add back SBC and why.
Updated
- An expense, not cash. It lowers net income and is added back on the cash flow statement.
- Grant-date value. Measured when granted, spread over the vesting period.
- Count it once. As a cost in cash flow, or as future dilution, never neither.
- Tax follows a different clock. The deduction usually comes at vesting or exercise, at a different value.
- Twelve questions below. Short answers in our words and the follow-ups to expect.
Stock-based compensation in three examples
Every number here is invented by Soreno for practice, in millions of dollars. Our conventions: a 25% tax rate, straight-line expense over vesting, no forfeitures, and the awards' tax deduction comes when they vest or are exercised.
Example 1: an RSU grant on the three statements$7.5 million off net income a year
A company grants restricted stock units worth $40 million on the grant date, vesting evenly over 4 years. This is year 1.
1. Income statement
$10 million expense, net income down $7.5 million
$40 million ÷ 4 years = $10 million of compensation expense. The book tax benefit at 25% is $2.5 million, so net income falls $7.5 million.
2. Cash flow statement
Cash unchanged
Start at net income, down $7.5 million. Add back the $10 million of non-cash SBC and take off the $2.5 million increase in the deferred tax asset, since no tax is saved in cash yet. Cash doesn't move.
3. Balance sheet
Assets and equity up $2.5 million
A deferred tax asset of $2.5 million appears, since the deduction comes later. Equity: paid-in capital up $10 million, retained earnings down $7.5 million, net up $2.5 million. Both sides move $2.5 million.
4. The real cost
Shareholders, not cash
Nothing left the bank, but the company promised shares it will issue at vesting. Existing holders bear the cost through dilution.
The $10 version of this walk
Example 2: SBC in a DCF and in EBITDA$1,000 million overstated
A company's unlevered free cash flow next year is $150 million with SBC treated as a cost. It pays $60 million a year in SBC, and both grow 3% a year forever. The discount rate is 9%. It reports EBITDA of $300 million after SBC, and its enterprise value is $4,800 million. We use a single growing perpetuity to keep the math short.
1. SBC as a cost
$2,500 million
$150 million ÷ (9% − 3%) = $2,500 million.
2. SBC added back
$3,500 million
Add back the non-cash $60 million: free cash flow $210 million, worth $3,500 million. That looks $1,000 million richer.
3. The missing cost
Future grants worth $1,000 million
The company will keep issuing $60 million of stock a year, growing 3%. Today's holders give up that much each year: $60 million ÷ 6% = $1,000 million. Take it off and the add-back version is back to $2,500 million.
4. The multiple
16.0x or 13.3x
On EBITDA after SBC, $4,800 million ÷ $300 million = 16.0x. On an adjusted EBITDA that adds SBC back, $4,800 million ÷ $360 million = 13.3x. Compare peers on the same basis, and say which one you used.
5. Say it
Count it once
Either SBC stays in as a cost and the share count is today's diluted count, or SBC is added back and you project the shares it will create. Adding it back with today's share count counts it zero times.
Example 3: book expense against the tax deduction$2 million more tax saved than booked
A company grants 1 million nonstatutory options with a $30 strike. An option pricing model values each at $12 on the grant date. Employees exercise them when the stock is $50.
1. Book cost
$12 million
1 million × $12 = $12 million, expensed over vesting. That number never changes after the grant, whatever the share price does.
2. The employee's income
$20 an option
For nonstatutory options without a readily determinable value, the IRS taxes the employee at exercise on the stock's value less the amount paid: $50 − $30 = $20.
3. The company's deduction
$20 million
FASB noted in its 2004 standard that US tax deductions were generally measured on the instrument's intrinsic value on a specified date, so they differ from book cost in amount and timing. Here, 1 million × $20 = $20 million, our simplified version.
4. The gap
$2 million
Book tax benefit $12 million × 25% = $3 million. Cash tax saved $20 million × 25% = $5 million. The stock rose, so the company saved $2 million more in cash than its books expected. Had the stock fallen, the gap would run the other way. Under US GAAP today the difference goes through income tax expense in the period the deduction arises.
From FASB Statement No. 123 (revised 2004), Share-Based Payment, now in ASC 718, IFRS Foundation: IFRS 2 Share-based Payment and IRS Topic 427, Stock options.
What the interviewer checks on SBC
In our experience the question is a judgment call dressed as accounting. The interviewer wants a position and a reason.
The mechanics
Expense on the income statement, added back on the cash flow statement, paid-in capital up on the balance sheet.
A position on the add-back
Say whether you add it back in a DCF and how you then count dilution.
Consistency
EBITDA multiples with and without SBC differ a lot for tech companies. Compare like with like.
Tax timing
The deduction comes later and at a different value from the book expense.
12 stock-based compensation interview questions
The short answers are ours. The note says what a strong answer adds.
Mechanics4 questions
A company records $10 of stock-based compensation. Walk me through the three statements.
Show follow-ups
Short answer. Pre-tax income falls $10 and net income by the after-tax amount. The $10 is added back on the cash flow statement. Equity gets the $10 in paid-in capital, offset by the lower net income in retained earnings.
Says where the tax effect sits, cash or deferred, and states the assumption. Practice it, see a model answer
How are RSUs and options expensed?
Show follow-ups
Short answer. At their grant-date fair value, spread over the period the employee must work to earn them, usually the vesting period. Options are valued with an option pricing model.
Adds that the expense doesn't change if the stock moves later.
Why does SBC create a deferred tax asset?
Show follow-ups
Short answer. The book expense comes now, the tax deduction comes at vesting or exercise. The future deduction is an asset.
Says the deduction can end up larger or smaller than the book expense.
What creates a deferred tax asset?
Show follow-ups
Short answer. Expenses booked before they are deductible, like SBC, or losses carried forward.
Uses SBC as the example. Practice it, see a model answer
Valuation4 questions
Should you add back stock-based compensation in a DCF?
Show follow-ups
Short answer. Only if you then count the shares it will create. The safer default is to treat it as a cash-like cost and use today's diluted shares.
Puts a number on the double standard, as example 2 does.
Is stock-based compensation a real expense?
Show follow-ups
Short answer. Yes. Employees are paid in shares instead of cash, and existing holders are diluted. If the company paid cash instead, nobody would add it back.
Mentions buybacks some companies use to offset the dilution.
How do you get from revenue to unlevered free cash flow?
Show follow-ups
Short answer. Revenue to EBIT, tax it, add back non-cash charges, take off capex and the increase in working capital.
Says whether SBC is among the add-backs and why. Practice it, see a model answer
Walk me through a DCF.
Show follow-ups
Short answer. Project unlevered free cash flow, discount it at WACC, add a discounted terminal value, then bridge to equity value and divide by diluted shares.
Handles SBC consistently between the cash flows and the share count. Practice it, see a model answer
Multiples and shares4 questions
What is EBITDA, and why do bankers use it?
Show follow-ups
Short answer. A rough operating earnings figure before financing, tax and non-cash depreciation and amortization.
Says SBC is often added back in company-defined adjusted EBITDA, and what that does to multiples. Practice it, see a model answer
How do you calculate diluted shares with the treasury stock method?
Show follow-ups
Short answer. Assume in-the-money options are exercised and the proceeds buy back shares at today's price. Add the net new shares and unvested RSUs.
Ties the share count to the SBC choice in the DCF. Practice it, see a model answer
Why do companies report adjusted EBITDA without SBC?
Show follow-ups
Short answer. Because it is non-cash and they see it as different from operating costs. Investors who see it as a real cost add it back in.
Takes a side and explains the other one.
How would you value a company that is losing money?
Show follow-ups
Short answer. Revenue multiples or a DCF that reaches profitability, with SBC treated as a cost, since it is often large at such companies.
Warns that adding back large SBC can make a loss look like a profit. Practice it, see a model answer
More to prepare with
Common stock-based compensation mistakes
Adding it back and using today's share count
In example 2 that overstates value by $1,000 million.
Saying it's free because it's non-cash
The cost is borne by shareholders through dilution instead of through cash.
Mixing EBITDA definitions across peers
16.0x against 13.3x for the same company in example 2.
Remeasuring equity awards at today's price
Equity-classified awards keep their grant-date fair value. Only liability awards are remeasured.
Assuming the tax deduction equals the expense
In example 3, $5 million of tax saved against $3 million booked.
Take a position on SBC out loud
Soreno's AI interviewer asks whether you add back stock-based compensation, then follows up on dilution and the three statements. You get a scored report on your answer.
Questions people ask
How is stock-based compensation measured under US GAAP?
FASB's Statement No. 123 (revised 2004) has a public company measure employee awards of equity at their grant-date fair value and recognize the cost over the requisite service period, usually the vesting period. No cost is recognized for awards whose holders don't render that service.
What about awards settled in cash?
The same standard measures them at current fair value and remeasures them at each reporting date until settlement.
How does IFRS treat share-based payments?
The IFRS Foundation's summary says IFRS 2 requires a company to recognize share-based payment transactions, including those with employees, and to reflect their effects in profit or loss, including expenses for share options granted to employees.
When is an employee taxed on a nonstatutory stock option?
For most nonstatutory options, which have no readily determinable value, the IRS says there is no taxable event at grant, and the employee includes in income the value of the stock received at exercise less the amount paid.
Is the company's tax deduction the same as its SBC expense?
Generally not. FASB noted in its 2004 standard that US tax deductions were generally measured on intrinsic value at a specified date, so they arise in different amounts and periods from the compensation cost on the books.
Should SBC be in EBITDA for comps?
Pick one basis for every peer. In our experience many companies exclude it from their adjusted EBITDA. In our view, keeping it in as a cost is the more honest default for high-SBC sectors.