Scope

ASC 718 governs the accounting for share-based payment transactions in which an entity acquires goods or services from employees or non-employees by issuing (or offering to issue) the entity's equity instruments, or by incurring liabilities that are based on the price of the entity's equity instruments.

Common in-scope awards:

Stock options (incentive and non-qualified)
Restricted stock awards (RSAs)
Restricted stock units (RSUs)
Stock appreciation rights (SARs)
Performance share units (PSUs)
Employee stock purchase plans (ESPPs)
Phantom stock and other equity-linked cash awards

The unit of account is the individual award. Each award is measured at its grant-date fair value (or, for liability-classified awards, remeasured each period to fair value).

Equity vs. liability classification

A foundational distinction:

Equity-classified awards — measured at grant-date fair value, expensed over the service period, never remeasured. Settlement is in shares.
Liability-classified awards — measured at fair value at each reporting date, with the change running through compensation expense. Settlement is in cash or, in some cases, a variable number of shares.

Classification is driven by the settlement terms and certain features of the award. Awards that require cash settlement, that include certain "cash exit" features, or that have repurchase obligations may be liability-classified. The classification matters enormously for earnings volatility — liability awards introduce mark-to-market expense each period.

Grant date

The grant date is the date the employer and employee reach a mutual understanding of the key terms and conditions of the award. For broad-based grants approved by the board, the grant date is typically the board approval date, provided communication to the recipient happens promptly. Awards where key terms are not yet final (e.g., performance targets not yet set) are not yet at grant date and accounting does not yet begin.

The "service inception date" — the date the recipient begins providing service — may precede the grant date if the award is granted retrospectively for service already provided. In that case, expense is recognized from the service inception date with a true-up at grant.

Grant-date fair value measurement

For equity-classified awards, fair value is measured at the grant date and is not subsequently remeasured for changes in market conditions.

Common valuation methods:

Black-Scholes-Merton model — closed-form option pricing for plain-vanilla options without unusual features.
Lattice / binomial models — for awards with American-style exercise, performance conditions, or unusual features.
Monte Carlo simulation — for market-condition awards (TSR-based PSUs, options with market-based vesting).

Inputs to option-pricing models:

Stock price at grant
Exercise price
Expected term (a critical, judgmental input)
Expected volatility (historical, implied, or peer group)
Risk-free rate
Dividend yield

For non-public entities, the simplified method for expected term and the practical expedient using historical or simplified volatility data are available. For non-public entity options, the calculation can be done at intrinsic value rather than fair value if practicable to determine fair value is impractical (ASC 718-10-30-22).

Service period and recognition

Compensation cost is recognized over the requisite service period — the period the recipient must provide service in exchange for the award.

For awards with service conditions only (continued employment for a vesting period), the service period is the vesting period.

For awards with performance conditions (vesting contingent on the entity achieving a specified target like revenue or EBITDA), the service period is the explicit or implicit service period. Compensation cost is recognized only when achievement of the performance condition is probable. If probability changes, expense is adjusted prospectively (forfeit-style for decreases).

For awards with market conditions (vesting contingent on stock price or TSR achievement), the market condition is incorporated into the grant-date fair value via a Monte Carlo simulation. Compensation cost is recognized regardless of whether the market condition is achieved.

Forfeitures

ASC 718 (post ASU 2016-09) permits entities to elect their accounting for forfeitures:

Estimate forfeitures — estimate the number of awards expected to vest and recognize expense accordingly, with subsequent true-ups.
Account for forfeitures as they occur — recognize expense on all awards as if they will vest, then reverse upon actual forfeiture.

Most companies have moved to the "as they occur" method because it's simpler operationally, though it introduces more period-to-period volatility.

Modifications

A change to the terms or conditions of an award is a modification. The modification accounting depends on whether the modification was:

Beneficial — increased fair value, increased vesting, or any other change improving the award. Recognize incremental fair value over the remaining service period.
Probability change — modifications that change the probability of vesting (e.g., accelerated vesting for terminated employees).
Type modification — modifications that change the classification (equity to liability or vice versa).

Each modification scenario has its own mechanics. The original grant-date fair value of the unmodified award continues to be recognized; incremental fair value (if any) is added.

Tax accounting (ASU 2016-09)

Excess tax benefits and tax deficiencies on the exercise/vest of stock awards flow through the income tax provision (not equity, as previously). This introduces volatility into the effective tax rate — particularly for companies with high option exercise volumes during periods when the stock has risen materially since grant.

The cash flow classification of excess tax benefits is in operating activities (not financing).

Employee Stock Purchase Plans (ESPPs)

ESPPs that meet specific criteria are non-compensatory (no expense) under ASC 718-50:

No option features other than the look-back and the discount
Discount no greater than 5% of the lower of grant-date or purchase-date price
Substantially all employees that meet limited eligibility criteria may participate on an equitable basis

Most ESPPs offer a 15% discount and a 24-month look-back, both of which exceed the non-compensatory thresholds. These plans recognize compensation expense for the option value.

Disclosure requirements (ASC 718-10-50)

Description of share-based payment arrangements
Grant-date weighted-average fair value
Compensation cost recognized in the period
Outstanding award activity (granted, exercised, forfeited, expired)
Weighted-average exercise prices and remaining contractual terms
Intrinsic value of options exercised
Total fair value of awards vested
Cash received from option exercises
Tax benefits realized

Common pitfalls

Expected term misestimation. Expected term for options drives a large portion of the fair value. Using contractual term as a proxy is wrong (people exercise early). Using the "simplified method" for ASC 718 awards by non-public entities is acceptable; using it for public entities is generally not, because public entities have actual exercise history.
Volatility input mismatch. Volatility should match the expected term of the award. A 7-year option valued with a 1-year volatility is wrong. Companies sometimes default to a single annualized volatility number without term-matching.
Performance condition probability not reassessed. When the entity's prospects change, the probability of achieving performance vesting changes too. Expense should be adjusted accordingly. A "set it at grant and forget it" approach produces unsupportable balances.
Modification accounting missed. Routine award changes (acceleration on termination, exercise period extensions) are modifications under ASC 718. Treating them as forfeitures or as no-impact events under-recognizes expense.
ESPP non-compensatory status assumed. Companies often inherit ESPP plans assuming they're non-compensatory. The criteria are narrow — most "typical" ESPPs are compensatory.
Tax windfall/shortfall volatility. Post-ASU 2016-09, large option exercises can drive material tax provision swings. The effective tax rate disclosure must explain the variance; companies sometimes under-explain it.

Operator note

Stock compensation is a low-noise area until it isn't. For mature public companies with stable grant programs, the expense profile is predictable and the accounting is mechanical. For growth-stage companies with frequent IPO preparation activity, founder transactions, or executive compensation overhauls, the modification accounting and the tax-effected exercise activity can drive material P&L volatility.

The audit attention concentrates in three places: (1) the valuation inputs, particularly expected term and volatility, (2) the performance condition probability assessments where applicable, and (3) the tax accounting under ASU 2016-09 for periods of high exercise activity.

For consulting clients in the pre-IPO range, the most common ASC 718 finding is incomplete documentation of the valuation. The 409A valuation (used for IRS purposes) is often available; the ASC 718 grant-date fair value documentation (used for GAAP) is often informal. They're related but not identical — the 409A is a point-in-time enterprise value derivation; the ASC 718 fair value is the option-level measurement at grant. Build separate files.

Related references

ASC 740 — Income Taxes (tax accounting for share-based awards)
ASC 820 — Fair Value Measurement (the framework for grant-date fair value)
ASC 260 — Earnings Per Share (treasury stock method for options and unvested shares)
IFRS 2 — Share-based Payment (international counterpart, with some classification and modification differences)