409A Valuations for Startups: What Founders Actually Need to Know

The first time a founder hears the term "409A valuation," it's usually because someone is waiting on them. A new engineer wants their option grant. A lawyer is asking for the strike price. An investor just closed a priced round and the cap table person mentions that the old 409A is now stale.

It sounds like a tax form. It's actually a formal appraisal of your company's common stock, performed by a third party, that determines the lowest legally defensible strike price you can put on the options you grant your employees. Get it right and everyone's options work the way they should. Get it wrong and your team gets hit with surprise tax bills on phantom gains, plus a 20% federal penalty, plus potential state penalties on top.

If you're issuing or about to issue stock options, this guide walks through what a 409A valuation is, when you need one, what it costs, and the mistakes that cost founders real money.

What Is a 409A Valuation?

A 409A valuation is an independent appraisal of the fair market value of your company's common stock. It takes its name from Section 409A of the Internal Revenue Code, passed in 2004 after the Enron scandal, which regulates how private companies issue deferred compensation (including stock options).

The core rule is simple. You cannot grant stock options at a strike price below the fair market value (FMV) of your common stock on the grant date. If you do, the IRS treats the discount as deferred compensation, which triggers immediate taxation to the recipient plus a 20% additional federal tax penalty. Some states pile on their own penalties (California's is another 20%).

The 409A valuation is how you establish that FMV in a way the IRS will respect. Get it from a qualified independent appraiser, and you get "safe harbor": the burden shifts to the IRS to prove your valuation was grossly unreasonable, rather than on you to prove it was correct. Without safe harbor, you carry the burden, and that's a bad place to be during an audit.

When Do You Need One?

You need a 409A valuation before you grant your first stock option. After that, the valuation stays valid for up to 12 months, but it expires sooner if a "material event" happens. Material events include:

• Closing a priced equity round (common, preferred, or bridge with equity features)
• A secondary sale of common stock
• Significant new customer contracts or revenue milestones
• Major hiring or firing that changes the business profile
• Receiving an acquisition offer
• Changes to the capital structure (new option pool, conversion, recap)

In practice, early-stage startups typically need a new 409A once a year unless they raise or have a material event, in which case they need one within 60 to 90 days of that event. Most founders don't realize this and let the valuation go stale, which silently invalidates safe harbor on every option they grant after the trigger event.

If you've closed a round in the last 90 days and haven't refreshed your 409A, that's a red flag to address now.

How Is a 409A Calculated?

Appraisers use three main approaches and blend them based on your stage.

The income approach. Discounted cash flow. Appraisers model your future cash flows and discount them back to present value. For pre-revenue or early-revenue startups, this is unreliable and usually gets low weight or is skipped.

The market approach. Compare your company to similar public companies ("comparable company analysis") or recent transactions ("precedent transactions"). For early-stage startups this relies on public SaaS multiples applied to forward revenue projections, with significant discounts for stage, liquidity, and control.

The asset approach. Net asset value. For startups this is rarely the driver because intangibles (team, IP, traction) aren't on the balance sheet.

Appraisers then allocate enterprise value across your capital structure using one of two allocation methods:

• Option Pricing Model (OPM). Treats each class of equity as a call option on the company's value. Good for single-stage companies where the exit path is uncertain.
• Probability-Weighted Expected Return Method (PWERM). Models multiple exit scenarios (IPO, acquisition, dissolution) with probabilities. Used more at later stages where exit paths are clearer.

Most seed-stage appraisals use OPM. Series B and later often blend OPM with PWERM. Neither method cares about your cap table hopes or the price your investors paid. What determines the common stock FMV is the analysis itself, with a discount from the preferred price (usually 60% to 90% for seed-stage companies).

That's why most founders are surprised that their common stock 409A value comes in at a fraction of the preferred price their investors just paid. It's correct. Common stock is worth less than preferred in a liquidation, so its FMV is lower.

What Does a 409A Valuation Cost?

Prices vary by provider and stage.

• Automated or cap-table-bundled (Carta, Pulley, AngelList): $1,500 to $3,500 per year, often bundled with cap table software subscriptions. Standard for pre-Series B startups.
• Boutique appraisal firms: $3,000 to $8,000 per year. Faster turnaround, more personalized analysis.
• Big 4 or specialty firms: $8,000 to $25,000+. Usually required at Series B and beyond, or when audit-grade defensibility matters.

For early-stage founders, the bundled option through your cap table provider is fine. The underlying analysis follows the same methodology, and the IRS has been comfortable with Carta and Pulley appraisals for years. The reason to upgrade later is audit scrutiny, not better math.

Can I Do It Myself?

Technically, yes. Section 409A allows a self-assessed valuation if your company is "illiquid" (less than 10 years old, no public market, no IPO expected within 12 months) and you document the methodology carefully.

In practice, no. Self-assessed valuations don't get safe harbor. The burden falls on you to defend the analysis during an audit, and the analysis needs to be rigorous enough that a forensic appraiser could reproduce it. Most founders don't have that expertise, and even if they do, the IRS will squint harder at a self-prepared valuation.

For $1,500 to $3,500, getting a third-party 409A is always worth it. This is not the line item to save money on.

What Do Founders Get Wrong?

The most expensive 409A mistakes are predictable.

• Letting it go stale. A 409A from 13 months ago isn't valid. Options granted on an expired 409A don't get safe harbor. Put the expiration date on your calendar the day the report arrives.
• Ignoring material events. Raised a round? Got a big customer? Had a reorg? Your 409A needs to be refreshed within 90 days. Many founders think "we already did our annual one" and keep granting on the stale number.
• Backdating grants. Doesn't matter that the grant was "approved" on a board meeting last month. If the documentation was signed today, the grant date is today, and today's FMV applies. Backdating to dodge a new 409A is a serious IRC violation and one of the first things auditors look for.
• Granting before the first 409A. Founders sometimes issue early option grants to the first few hires before getting a valuation, assuming common stock is worth basically nothing. The IRS disagrees. You need a valuation before the first grant.
• Using investor pricing for the strike. The preferred stock price from your last round is not the common stock FMV. Appraisers apply a significant discount. Using preferred price as strike overpays the IRS and gives your team worse economics.
• Ignoring it because you're pre-revenue. 409A applies even if you have zero revenue. If you're issuing options, you need a valuation.

Clean, well-organized financials make getting a 409A faster and cheaper because appraisers spend less time reconstructing your numbers. If your balance sheet and cap table are messy, expect back-and-forth and higher fees. Real-time daily bookkeeping produces the clean inputs your appraiser needs without a scramble.

Frequently Asked Questions

How long does a 409A valuation take? For bundled services like Carta or Pulley, 10 to 15 business days is typical. For boutique firms, 2 to 4 weeks. For audit-grade work, 4 to 8 weeks. Plan ahead if you have a closing grant deadline.

Do I need a 409A before I've issued any options? Only when you're ready to grant. If you've issued common stock to founders as part of incorporation, no 409A is required for those founder shares. But before any employee stock options, yes.

What if I'm a solo founder with no employees? You don't need a 409A until you issue options to anyone besides yourself. As a sole founder holding common stock from incorporation, no 409A is required. The moment you hire and grant options, you need one.

Does a 409A valuation set my company's overall valuation? No. 409A values common stock, not the company as a whole. Venture investors set your priced-round valuation based on the preferred stock they're buying, which is typically much higher than the common stock FMV. The two numbers serve different purposes and are expected to diverge.

Can investors see my 409A? Usually yes, during due diligence. Investors want to see that your option grants are IRS-compliant and that your cap table reflects defensible strike prices. A stale or missing 409A is an investor red flag that can stall or kill a deal.

How does a 409A interact with ISOs vs NSOs? The grant-at-FMV rule applies to both. ISOs have additional rules (the $100K limitation, 10-year term, employee-only requirement), but the 409A floor applies equally. NSOs are more flexible on other dimensions but the 409A FMV rule is non-negotiable.

The Bottom Line

A 409A valuation is the legal floor for your option strike prices and the safe-harbor shield for your option grants. Get one before you grant options. Refresh it annually or within 90 days of any material event. Budget $1,500 to $3,500 a year for early-stage companies. Use a reputable independent appraiser, not a spreadsheet you built.

This week: Check when your current 409A expires. If you've closed a round, made a material hire, or signed a major contract in the last 90 days, schedule a refresh.

Next quarter: Add a calendar reminder 60 days before your 409A expires so you're not granting options on an expired valuation at the end of a sprint.

If your financials aren't ready to hand to an appraiser, that's the step to fix first. Clean books make every annual filing (409A, franchise tax, audit prep, investor diligence) faster and cheaper. See how Median handles the financial operations founders need so 409A season stops being a fire drill.