Before you grant a single stock option to your first employee, there are two things you must have in place: an option plan approved by your board and a current 409A valuation. Without the second, the first creates an immediate and severe tax problem — not for the company, but for every employee who receives the options.

This guide explains in plain English what a 409A is, how it is calculated, when you need one, and how to avoid the costly mistakes that create problems in future audits, funding rounds, and acquisitions.

Business Valuation Methods and Frameworks

What Is Section 409A?

Section 409A of the Internal Revenue Code governs the taxation of nonqualified deferred compensation — which stock options technically are (a promise to allow someone to purchase stock at a future date). The rule states that if compensation is deferred and was not earned at fair market value, it becomes taxable immediately upon vesting, rather than upon exercise or sale.

For stock options, this means: if you grant options at an exercise price below the fair market value of the common stock:

  • The entire spread between the exercise price and FMV becomes ordinary income at vesting
  • A 20% penalty tax on top of ordinary income rates applies
  • Interest accrues from the date of vesting

The result: an employee who receives options granted below FMV faces a possibly catastrophic tax bill at vesting — before they have received a single dollar from the options — and often before the company has done a liquidity event.

The solution: obtain an independent 409A valuation before granting options. Options priced at or above the FMV established by the appraisal are safe.

How the 409A Valuation Works

Step 1: Value the Enterprise

The first step is determining the total enterprise value of the company using one or more of the standard valuation approaches:

Income Approach (DCF): Projects future cash flows and discounts them to present value at a rate reflecting the company’s risk profile. Most relevant for revenue-generating companies.

Market Approach (Comparable Companies): Compares the company to publicly traded peers using revenue or EBITDA multiples. Most relevant for companies with predictable revenue.

Asset Approach (Net Asset Value): Primarily used for pre-revenue companies where the main value is the IP, technology, or other tangible assets.

Step 2: Allocate to Common Stock (The Critical Discount)

The company’s enterprise value must then be allocated between the preferred stock and common stock. Because preferred stockholders have liquidation preferences (they receive their invested capital back before common stockholders in any sale or liquidation), preferred shares are more valuable than common shares.

The two main allocation methods are:

Option Pricing Model (OPM): Treats preferred and common stock as a series of call options on the enterprise value. Most common for early-stage companies with a wide range of possible outcomes.

Probability-Weighted Expected Return Method (PWERM): Explicitly models specific future liquidity scenarios (IPO, M&A, continued private operation) and weights the common stock value by the probability of each outcome. More work-intensive but can be more favorable in clear-trajectory situations.

The Common/Preferred Discount

A useful rule of thumb for the implied discount from preferred price to common stock FMV:

Company Stage Typical Common/Preferred Ratio
Pre-seed/Seed 5%–15% of preferred
Series A 20%–35% of preferred
Series B 40%–60% of preferred
Series C+ 60%–85% of preferred
Pre-IPO 80%–95% of preferred

This is why options granted right after a Series A (where the preferred was priced at $2.00/share) might have an exercise price of $0.60–$0.70/share. Both numbers are correct — they reflect different share classes.

When Do You Need a New 409A?

Your current 409A expires (becomes “stale”) under two conditions:

1. The 12-Month Clock: A valuation is valid for up to 12 months. After 12 months, it must be refreshed before issuing new grants — even if nothing has materially changed.

2. A Material Event (whichever comes first):

  • Closing any priced equity financing round (Series Seed, A, B, C, etc.)
  • A significant acquisition of another company or a material asset
  • A major new customer contract that materially changes financial prospects
  • Execution of a letter of intent (LOI) for an M&A exit
  • A significant change in business model

Timing tip: If you know a financing round is imminent, consider batching all pending option grants immediately after the 409A is complete but before the round closes. Once the preferred is priced at the new terms, the 409A value will jump — and new grants will have a significantly higher exercise price.

Choosing a 409A Provider

Provider Type Best For Cost Audit Defensibility
Software-based (Carta, Pulley, Shareworks) Pre-seed, seed, <$2M raised $500–$2,000 Adequate for most early-stage companies
Boutique advisory firms Seed through Series B $3,000–$8,000 Strong
National CPA firms Series C+, pre-IPO $10,000–$25,000+ Strongest (Big 4 opinion)

For most startups raising below $20M total, software-based 409A providers that engage supervising CPAs are fully defensible and cost-effective. As the company approaches an IPO or is in an active M&A process, switching to a recognized Big 4 or national firm for the most recent valuation is advisable.

409A Mistakes to Avoid

Granting options before receiving the 409A: Never grant options without a current valuation on file. The board resolution approving the grants should reference the specific 409A valuation date and conclusion.

Ignoring material events: Closing a round and not getting a new 409A before issuing more options is the most common mistake. All options issued during the “stale” period have potential 409A violations.

Misunderstanding the FMV conclusion: The 409A appraiser values common stock FMV. Make sure the option exercise price in your plan administration system matches this exactly — rounding errors are surprisingly common.

Conclusion

A 409A valuation is not bureaucratic overhead — it is the legal foundation that protects every employee who receives stock options from an unexpected, catastrophic tax event. Properly structured, regularly refreshed 409A valuations also eliminate one of the most common due diligence findings in M&A processes and Series B audits: options granted below fair market value without a supporting independent appraisal.

Frequently Asked Questions (FAQ)

What is a 409A valuation?
An independent appraisal of a private company’s common stock fair market value, establishing the minimum price at which stock options can be granted without triggering punitive IRS penalties.

Why do companies need a 409A valuation?
Options granted below FMV trigger immediate ordinary income tax on the full spread at vesting plus a 20% penalty tax for every option holder — a potentially company-threatening liability.

How is a 409A valuation calculated?
Using enterprise value (DCF, market comps, or asset approach) then allocating to common stock using an Option Pricing Model or PWERM to account for preferred stock liquidation preferences.

How often should a startup get a new 409A valuation?
Every 12 months or after any material event (new financing round, major acquisition, LOI for exit, major new customer) — whichever comes first.

How much does a 409A valuation cost?
Software-based options: $500–$2,000. Boutique advisory firms: $3,000–$8,000. National CPA firms: $10,000–$25,000+.

What is the ‘safe harbor’ protection for 409A valuations?
An independent appraisal by a qualified appraiser creates a legal presumption of reasonableness, shifting the burden to the IRS to prove the valuation was “grossly unreasonable” if challenged.

What is the difference between preferred stock price and 409A common stock price?
Preferred stockholders have liquidation preferences common stockholders don’t, making preferred shares worth more per share. A 50% discount from preferred to common is normal at Series B.

Can a founder self-appraise their company for 409A?
Technically allowed for very early-stage companies but provides much weaker legal protection. Independent appraisals are strongly recommended for any company issuing options at scale.

What happens to outstanding options if the 409A valuation increases?
Existing options are unaffected — their exercise price is locked at grant. Only new grants after the new valuation must be priced at or above the new higher FMV.

How do 409A valuations factor into M&A and IPO processes?
All historical grants are reviewed to verify FMV compliance. Options found to have been granted below FMV create personal tax exposure for option holders and require cash settlements that can delay transactions.