ASC 718 explained: stock comp expense accounting for startups without losing your mind

The first time a startup actually books stock-based compensation expense correctly is usually right before its first audit. By that point, the controller has spent weeks reconstructing grants, valuing them, calculating the expense for prior periods, and realizing that what should have been simple monthly journal entries are now a remediation project requiring outside specialists.

ASC 718 — the accounting standard that governs how companies record stock-based compensation expense — isn’t optional. If you grant stock options, RSUs, or restricted stock to anyone (employees, advisors, contractors, board members), you have to recognize compensation expense on your income statement for the value of those grants. This is true even though no cash leaves the company. The expense affects your net income, your gross margin reporting, and how investors and auditors evaluate your financials.

This post is for finance leads building out their first stock comp expense process, founders preparing for an audit and discovering they need to address ASC 718, and operators trying to clean up prior periods where the accounting was done poorly or not at all. The goal: a clear, operator-grade view of what ASC 718 actually requires, what it costs to implement, and the mistakes that turn it from a routine monthly journal entry into an expensive audit problem.

What ASC 718 actually requires

The principle is straightforward: when a company grants stock-based compensation to a service provider, the company has received services in exchange for an equity instrument. The fair value of that equity instrument is compensation expense, and it has to be recognized on the income statement.

The mechanics:

1. At the grant date, the company measures the fair value of the award. For stock options, this typically means using an option pricing model (Black-Scholes most commonly, sometimes a more complex lattice model). For RSUs and restricted stock, the fair value is generally the current stock price (the 409A value, for a private company). For performance-based awards, the fair value calculation incorporates the probability of achievement.

2. Over the requisite service period (usually the vesting period), the company expenses that fair value. Operating expense on the income statement, with the offsetting credit to additional paid-in capital (APIC) on the balance sheet. The expense pattern depends on the vesting structure — typically straight-line for service-based vesting, but accelerated for graded vesting in some cases.

3. The expense allocates across cost categories based on what the recipient does. Stock comp for an engineer goes into R&D. Stock comp for a salesperson goes into sales and marketing. Stock comp for a controller goes into G&A. This allocation matters for gross margin reporting and is something auditors examine carefully.

4. The company tracks the expense by award through final vesting. This requires maintaining a record of every grant — original fair value, vesting schedule, modifications, forfeitures — and producing monthly expense calculations that tie back to each grant.

For most startups, the result is a journal entry every month that debits operating expense (allocated to R&D, S&M, and G&A) and credits APIC. The balance sheet APIC line grows as expense is recognized; the income statement shows real compensation expense even though no cash has moved.

Why this matters more than founders think

It would be tempting to dismiss ASC 718 as accounting bookkeeping with no real business impact. After all, no cash leaves the company. The expense is non-cash. Why does it matter?

A few reasons it matters significantly:

It affects your operating losses and gross margin. Stock comp expense can be material — for many Series A and B startups, it represents 5–15% of total operating expense. Recognized correctly, it reduces reported gross margin and increases reported operating loss. Investors and auditors look at both metrics carefully.

It’s one of the most-scrutinized lines during audit. Auditors verify stock comp expense by sampling individual grants and recalculating the expense. They check the inputs to the option pricing model. They verify the allocation across cost categories. Errors here trigger audit findings and sometimes restatement.

It’s a common source of audit findings. We see ASC 718 issues during nearly every first audit we help prepare for. The most common findings: incorrect Black-Scholes inputs, missed grants to advisors or board members, wrong expense allocation across categories, and forfeitures that weren’t properly accounted for.

It affects diligence during fundraising and M&A. When investors or acquirers rebuild your financial statements during diligence, stock comp expense is one of the first lines they recompute. If your expense calculations don’t hold up, your reported losses get adjusted, which can affect valuation discussions.

It interacts with tax accounting in non-obvious ways. Stock comp expense for book purposes (under ASC 718) is different from tax deductible compensation. The difference creates deferred tax assets that have to be tracked. Getting the book-tax differences right matters for tax provision accounting (ASC 740) and eventually for the tax filings themselves.

In short: ASC 718 is the line item where the “we’ll deal with it later” approach costs the most.

The mechanics — what you actually have to do

For each grant, the company needs to track and compute several pieces of information.

At grant date:

• Identify the type of award. Stock options (ISOs or NSOs), RSUs, restricted stock awards, performance awards, ESPP shares.
• Determine the fair value. For stock options, use Black-Scholes or a more complex model with inputs for stock price, exercise price, expected term, expected volatility, risk-free rate, and expected dividend yield. For RSUs and restricted stock, use the current stock price (409A FMV for a private company).
• Determine the requisite service period. Usually the vesting period. For service-based vesting, this is the time until the award fully vests. For performance-based awards, it’s the longer of the explicit service period and the period to achieve the performance condition.
• Determine the expense attribution method. Straight-line for most awards. Accelerated (graded) attribution for awards with graded vesting in certain cases.
• Identify which cost category the expense flows into. R&D, S&M, G&A, or COGS depending on the recipient’s role.

Each subsequent period (typically monthly):

• Calculate the period expense for each open grant. Apply the attribution method to recognize the appropriate portion of the total fair value.
• Apply forfeitures. When employees leave before vesting, their unvested grants are forfeited. The accounting can either estimate forfeitures (and adjust as they happen) or account for forfeitures only as they occur (called the “actual forfeitures” method). The election needs to be documented and applied consistently.
• Aggregate expense by cost category. Sum the period expense across all grants, then allocate to R&D, S&M, G&A, or COGS based on each recipient’s role.
• Book the journal entry. Debit the appropriate operating expense categories, credit additional paid-in capital.

At significant events:

• Modifications. Repricing of options, extension of post-termination exercise windows, acceleration of vesting — these are modifications that require remeasurement of the award. The incremental fair value is additional expense recognized over the remaining service period.
• Settlement. Cash settlement of vested awards, share withholding for taxes, or buyback of vested shares all have specific accounting treatment under ASC 718.
• Cancellation. Cancellation of unvested awards either accelerates remaining expense or reverses prior expense depending on the structure.

The Black-Scholes inputs that actually matter

For companies that grant stock options (most startups), the fair value calculation under ASC 718 is typically done using the Black-Scholes option pricing model. The model takes six inputs:

1. Stock price. For a public company, the closing stock price on the grant date. For a private company, the 409A fair market value at grant.
2. Exercise price. The strike price of the option, which for a properly-issued ISO or NSO equals the 409A fair market value at grant.
3. Expected term. This is the most-judgmental input. It’s the period over which the company expects the option to be outstanding, considering early exercises and forfeitures. For typical startup options (4-year vest, 1-year cliff, 10-year contractual term), the expected term is usually 5–7 years. The SEC’s simplified method provides a default calculation that many private companies use.
4. Expected volatility. The volatility of the underlying stock’s returns over the expected term. For public companies, this is computed from historical stock price data. For private companies, the standard practice is to use the historical volatility of comparable public companies in the same industry — typically 4–6 comparable companies, with volatility computed over a period matching the expected term.
5. Risk-free rate. The yield on a U.S. Treasury security with a term matching the expected term. Easy to look up, low judgment.
6. Expected dividend yield. The annualized dividend yield expected over the expected term. For most startups (no dividends paid or anticipated), this is zero.

Of these, the inputs that auditors scrutinize most carefully are expected term and expected volatility. Errors in either can result in materially wrong fair values, which compound over hundreds of grants into significant expense errors.

What this actually costs to implement and maintain

The cost depends heavily on whether you’re implementing cleanly or remediating prior failure.

Clean implementation:

For a company with a relatively simple grant history (typical 4-year vest, no performance awards, no complex modifications):

• Initial setup: $5,000 – $15,000 (one-time, depending on grant volume)
• Software (Carta, Pulley, or specialized ASC 718 tools): typically integrated into the cap table platform at $3,000 – $12,000/year
• Annual maintenance: $3,000 – $8,000 (integrated into ongoing controller engagement)

For a company with hundreds of grants, complex vesting structures, performance awards, or international grants:

• Initial setup: $15,000 – $40,000
• Software: $5,000 – $20,000/year
• Annual maintenance: $8,000 – $25,000

Remediation (catching up on prior periods):

Dramatically more expensive. Typical scope:

• Remediation cost: $25,000 – $150,000+ depending on grant volume and complexity
• Audit fee impact: 20–50% increase for the first audit after remediation
• Potential restatement implications if the errors were material in prior reported periods

The pattern, same as ASC 842: clean implementation costs an order of magnitude less than remediation. Companies that engage with ASC 718 before their first audit save dramatically compared to companies that wait.

The software that actually helps

For companies with more than 20–30 grants, doing ASC 718 expense calculations in Excel becomes impractical. Specialized tools have emerged to handle this:

Carta. The dominant cap table platform also handles ASC 718 expense calculations natively. For most startups using Carta as their cap table provider, the ASC 718 functionality is the path of least resistance. Calculations flow from grant records to expense reports, which can be exported to your accounting system.

Pulley. Carta’s primary competitor in the cap table space, with similar ASC 718 functionality. For startups using Pulley, the integrated approach is again the easiest path.

Shareworks (Morgan Stanley). Used by more established and pre-IPO companies. Comprehensive, expensive, and tightly integrated with broader equity administration services.

Specialized accounting tools. Some companies use dedicated ASC 718 modules within NetSuite or Sage Intacct, particularly for larger companies with complex grant structures.

For most Series A and B startups, the integrated approach (cap table provider plus their built-in ASC 718 functionality) is the right path. Carta and Pulley both handle the standard well. The migration to a dedicated tool typically happens at Series C or later, when grant complexity and reporting requirements exceed what cap table platforms cover comfortably.

The mistakes we see consistently

Mistake 1: Forgetting about grants to non-employees.

ASC 718 applies to all share-based payments to service providers, including advisors, contractors, and board members. Companies that track expense only for employee grants often miss meaningful expense on advisor and board member equity. The accounting for non-employee grants used to be different from employee grants, but ASU 2018-07 aligned the treatment — both now follow the same principles.

Mistake 2: Wrong expected volatility inputs.

Using the wrong comparable public companies, using volatility over the wrong period, or copying inputs from a prior valuation without refreshing them — all of these produce wrong Black-Scholes fair values. Auditors examine volatility methodology carefully because small errors compound across many grants.

Mistake 3: Not allocating expense across cost categories.

Companies sometimes book the entire stock comp expense to G&A rather than allocating to R&D (for engineers), S&M (for salespeople), and COGS (for customer support and implementation staff). The misallocation distorts gross margin reporting and is an audit finding waiting to happen.

Mistake 4: Missing modifications.

When a company extends the post-termination exercise window for departing employees, accelerates vesting for an acquired company’s holders, or reprices underwater options, these are modifications that trigger remeasurement under ASC 718. Companies that just “do the right thing” on behalf of employees without consulting the accounting consequences often discover the modifications during audit and have to record significant incremental expense.

Mistake 5: Forfeitures treated wrong.

The election between estimated forfeitures and actual forfeitures (ASU 2016-09 allowed companies to elect either approach) needs to be documented and applied consistently. Companies that switch approaches without making formal elections, or that estimate forfeitures incorrectly, generate audit findings.

Mistake 6: ESPP shares not accounted for.

Companies with employee stock purchase plans (ESPPs) have additional ASC 718 considerations. The 15% discount and the look-back feature both create expense that needs to be recognized. Many smaller companies with simple ESPPs underestimate the expense.

Mistake 7: Tax accounting (ASC 740) implications missed.

Stock comp expense for book purposes (under ASC 718) doesn’t match the tax deduction the company gets at exercise or vesting. The difference creates deferred tax assets that need to be tracked. Companies that don’t coordinate ASC 718 with ASC 740 (tax accounting) often have tax provision errors that surface during audit.

How to actually get this right

The pragmatic playbook:

Step 1: Get every grant into a structured record. Either in your cap table platform or in a dedicated ASC 718 tool. Each grant needs: recipient, role/department, grant date, type (option/RSU/restricted stock), fair value at grant, vesting schedule, modifications, current status.

Step 2: Set up the fair value calculation methodology. Document the inputs to the option pricing model — comparable companies for volatility, expected term methodology, risk-free rate source. This document is what you’ll share with your auditor.

Step 3: Set up monthly expense calculations. Either in software (preferred for >30 grants) or in a structured Excel template. The output is a monthly journal entry by cost category.

Step 4: Coordinate with payroll. Stock comp recognition has tax implications, particularly at vesting for RSUs and at exercise for NSOs. The payroll team needs to know when these events happen so they can handle withholding and reporting correctly.

Step 5: Document policy decisions. Forfeiture method election, expected term methodology, fair value methodology, expense allocation policy. Auditors will want to see all of these documented.

Step 6: Plan for modifications. Every change to a grant (acceleration, extension, repricing) triggers remeasurement. Build a process to flag potential modifications so they don’t get missed.

Step 7: Reconcile to the cap table. Total stock comp expense recognized through the period should reconcile to total fair value of grants outstanding (vested portion). If these don’t tie, there’s an error.

When to bring in operator support

ASC 718 is technical enough that most fractional CFO firms refer this work out. Pegacorn handles ASC 718 implementation and remediation in-house, which means the work integrates with your broader accounting rather than requiring a separate specialist engagement.

You probably don’t need outside help if you have a strong in-house controller with ASC 718 experience, your cap table platform’s ASC 718 module is producing clean output, and you’ve been doing the accounting correctly from the start.

You likely do want operator support if:

• You’re preparing for your first audit and your stock comp expense calculation hasn’t been formalized
• Your auditor flagged ASC 718 issues in a prior period
• You’re cleaning up stock comp accounting after a CFO transition or M&A event
• You’ve granted equity to advisors, contractors, or board members and aren’t sure if the accounting is correct
• You’ve recently modified grants (extended exercise windows, accelerated vesting, repriced) and need to make sure the modifications were accounted for properly
• You’re approaching Series B or C and want to make sure your stock comp accounting is defensible during diligence

Pegacorn Group works with venture-backed startups on ASC 718 implementation, remediation, and ongoing stock comp accounting. We integrate this work with the broader equity comp design, cap table hygiene, and audit prep that founders need at scale. Let’s talk.

This post pairs with: ASC 842 explained: lease accounting for startups, 409A valuations explained, ISO vs NSO vs RSU: a founder’s decoder, and Your first audit: a 6-month playbook.