409A Valuation: What Angel Investors Should Check

TL;DR: A 409A valuation is an independent appraisal of what a private company's common stock is worth for tax purposes, used to set employee option strike prices. It is not the price you pay for preferred shares. As an investor, treat it as a diligence input. Check its date, its gap to your price, and what changed since.

If you write $25,000 to $250,000 checks, you will eventually be handed a data room with a 409A report in it. Most angels skim past it because it looks like the founder's compliance homework. I read it early. As Waterfalls explains, the report sets the strike price for the company's stock options, so it shows how the company's own advisers priced the common stock and how the team gets paid.

The Navy gave me my habit here. As a QA supervisor on a submarine I signed off on more than 1,000 jobs, and I learned that a document in the folder proves nothing until you check its date and what it covers. Verify before you trust. A 409A report deserves the same treatment, and it is exactly the kind of paper a sponsor hopes you will not open.

What is a 409A valuation, and why does a startup need one?

It is the appraisal that lets a company grant stock options at a defensible strike price. The name comes from Section 409A of the Internal Revenue Code, which has nothing to do with investors. Waterfalls defines it as "an independent appraisal of the fair market value (FMV) of a private company’s common stock, required under U.S. Internal Revenue Code Section 409A before a startup can grant stock options at a defensible strike price."

The stakes fall on employees first. StartupCFO says a bad one lands on them as a 20 percent federal excise tax, state penalties, and accumulated interest. You care because a team staring at a surprise tax bill is a team that may walk out the door, and you are betting on that team.

How is a 409A different from the price you paid?

They measure different securities. You most likely bought preferred stock, which carries rights that common stock does not. 409.AI points out that preferred shares come with liquidation preferences and anti-dilution protection, so the common value is typically well below the preferred price, often 20–60% of it for early-stage companies.

There is a second difference, and it is the one hype tends to blur. AngelList says 409A valuations aren't based on market demand the way a financing round is. Your round price reflects what investors were willing to pay in a hot market. The 409A reflects an appraiser's view of the common stock on a given date.

	Your round price	The 409A value
Security priced	Preferred stock	Common stock
Who sets it	You and the lead, by negotiation	An independent appraiser
What drives it	Investor demand and terms	Appraisal method, not market demand
Typical relationship	The higher number	Often 20–60% of the preferred price at early stage, per 409.AI

Read the table by row. A 409A far below your price is normal, so it does not mean the company overpaid itself or that you did. The gap is the thing to understand, and it is not a reason to panic.

How old is too old for a 409A?

Past 12 months, or earlier if something big happened. Waterfalls says a qualifying appraisal holds for 12 months or until the next material event, whichever comes first, and it names a priced round, a large secondary, and acquisition talks as material events.

That second trigger is where I look. StartupCFO adds an acquisition offer, an unexpected revenue inflection, a major commercial contract, or a significant restructuring to the list, and says any of them can invalidate the prior report before the 12-month mark. So lay the report date next to the company's timeline. A report dated before your own round is already out of date for new grants.

The founders may not be hiding anything. A busy team closes a round, signs a big customer, and forgets that the paper in the drawer no longer describes the company. You find that out only by comparing dates.

What does a stale or low 409A signal?

A stale one most often signals sloppy housekeeping, and sometimes a real liability. Waterfalls says that if the most recent 409A is older than 12 months or pre-dates a material event, the IRS will not treat it as safe harbor, and the strike price is open to challenge. If a company has been granting options on an expired report, ask how many grants went out and who is fixing them.

A low one deserves a different question. A low common value is not a red flag by itself, given the preferred gap above. What I want to know is whether it was set before a hot round and never refreshed. Options granted at an old, low strike price after the company's story changed are the situation the rules exist to catch, and StartupCFO describes the result for employees as a 20 percent federal excise tax, state penalties, and accumulated interest.

This is where I put the downside first, the way I do with every private deal. Before I ask how the company wins, I ask how I lose. A stale 409A can mean a tax problem for the people building the product, a cleanup bill the company has to pay, and a distracted team right when you need them focused.

That is my read of the evidence, not a rule. A single report cannot tell you whether the founders were careless or just busy, though it can tell you which question to ask.

What should you ask the founder to show you?

Four things, in this order:

1. The most recent 409A report and its effective date.
2. A list of every option grant made since that date.
3. Any priced round, secondary, or acquisition talks since that date.
4. Who the appraiser was, and whether the provider is independent of the company.

Cost is a loose clue about stage. Waterfalls puts it at roughly $1,000-$2,500 at pre-seed, rising to $8,000-$25,000+ pre-IPO. A late-stage company paying pre-seed prices is worth a polite question, because a cheap report on a complicated company may not have looked very hard.

None of this makes you the company's tax adviser. You are checking whether the paperwork matches the story the founder told you in the pitch. If it does, you move on. If it does not, you have learned something that no deck would have shown you.

Where does the 409A fit in your wider valuation work?

It is one input among several, and a modest one. A headline valuation tells you what the last investors agreed to pay. The 409A tells you what an appraiser thinks the common stock is worth after the preferences are accounted for. Together they show how much of the story is price and how much is structure.

If you want to see where a round price comes from, our piece on Series B valuation cap negotiation walks through how the number gets argued. The convertible note explainer covers what happens when the price is deferred, which is common at the angel stage. For a worked example of a headline angel valuation, see Quantum AI Startup Angel Funding Valuation Explained, then ask what the common stock in that company would be appraised at.

Common mistakes

Plenty of angels compare the 409A to their round price and conclude the company is overvalued. The two numbers price different securities, so the comparison tells you almost nothing.

Others take the founder's word that "we have a 409A" and never read the date. A report that exists is not the same as a report that is current.

Material events trip people up too. If the company closed a round last month and the 409A predates it, the report no longer covers new grants, whatever the founder says.

The last mistake is treating the report as a verdict on your investment. It is an input to your diligence. It does not tell you whether the company will return your money.

FAQ

What is a 409A valuation in simple terms?

It is an independent appraisal of a private company's common stock, used to set the strike price for employee stock options. It is named for Section 409A of the Internal Revenue Code. It is separate from the price investors pay in a funding round.

Is a 409A valuation the same as a company's valuation?

No. The 409A values common stock for tax purposes. A round valuation reflects what investors paid for preferred stock. 409.AI says common value is often 20–60% of the preferred price at early stage.

How long is a 409A valuation good for?

Twelve months, or until the next material event, whichever comes first. Waterfalls lists a priced round, a large secondary, or acquisition talks as events that end it early.

What happens if a startup grants options without a valid 409A?

Employees can face a 20 percent federal excise tax, state penalties, and accumulated interest, according to StartupCFO. The company also has a cleanup job on its hands.

Before your next wire

When the 409A date predates a priced round or a large contract, ask the founder when the refresh is scheduled and hold the wire until you have the answer. If you want more diligence checks like this one, written by someone who has lost money doing it the hard way, the free AIN briefing sends them to your inbox.

Educational content only. Not investment, tax, or legal advice. Not an offer or solicitation to buy or sell securities. Past performance does not guarantee future results. Private-market investments are illiquid and involve risk of loss, including total loss of capital. Consult qualified advisers. Angel Investors Network is not a broker-dealer or investment adviser.