The Founder’s Guide to 409A Valuations

What a 409A valuation actually is

A 409A valuation is an independent appraisal of the fair market value (FMV) of your company’s common stock — the plain shares your employees get options on, not the preferred stock your investors bought. The name comes from Section 409A of the Internal Revenue Code, which governs deferred compensation. Stock options count as deferred compensation, and the IRS cares about exactly one thing here: that you don’t hand employees options priced below what the shares are really worth, because a below-market strike price is disguised income.

Practically, the valuation does one job: it sets the floor for your option strike price. Grant options at or above the 409A FMV and you’re fine. Grant below it and every affected employee faces immediate income tax on their vested options — plus a 20% additional federal tax, plus interest. Read that again: the penalty lands on your employees, not the company. Mispricing options is one of the few startup mistakes where the people you were trying to reward pay the bill.

If you’re brand new to this, start with the plain-English version: 409A explained for first-time founders and what a 409A valuation is and why your startup needs one.

When you need one — and when to refresh

The baseline rule is simple: you need a valuation before you grant any options. Not after, not “once we get around to it.” No valuation means no defensible strike price.

After that, two clocks run in parallel:

• The 12-month clock. A 409A valuation is good for at most 12 months. Even in a quiet year, you need a fresh one to keep granting options. Most companies time the annual refresh a month or two ahead of their big grant cycle.
• The material-event clock. Any event that plausibly changes your company’s value resets the clock early. The big ones: closing a priced funding round (up or down), a major revenue inflection in either direction, a secondary sale or tender offer, receiving an acquisition offer, launching or killing a flagship product, or a key executive departure.

The classic mistake: close a Series A in March, keep granting options in June at the old pre-round strike price. The round almost certainly moved your FMV, which means those June grants are likely underpriced — exactly the situation the penalties exist for.

And yes, this applies to you even if you’re pre-revenue and funded entirely on SAFEs and convertible notes. The trigger is granting equity compensation, not having revenue. For the full trigger list, see when you need a 409A valuation; for planning around it, see how long a valuation takes.

Safe harbor: how the protection actually works

“Safe harbor” is the reason 409A valuations exist as a product at all, so it’s worth understanding the mechanics rather than just nodding along.

By default, if the IRS challenges your option pricing, you have to prove your FMV was reasonable. Safe harbor flips that burden. Follow one of the prescribed valuation procedures and your FMV is presumed reasonable — the IRS can only overturn it by proving it was “grossly unreasonable.” Not wrong. Not aggressive. Grossly unreasonable. That’s a bar the IRS almost never clears against a competently prepared report.

The regulations offer three safe harbors:

• Independent appraisal. A qualified, independent appraiser values the company. This is the one effectively every startup uses, and the only one worth relying on in practice.
• Start-up company safe harbor. Available to companies under 10 years old with no public securities and no exit expected within 180 days; the valuation can be done internally by someone with “significant knowledge and experience.” It exists on paper, but it’s a weaker shield and auditors treat it accordingly.
• Binding formula. A fixed formula applied consistently to every transfer. Almost nobody uses it, for good reason — it’s rigid in exactly the ways startups aren’t.

The independence part is not a formality: an appraiser with a financial stake in your company voids the presumption entirely. More on the mechanics in what safe harbor is and why everyone talks about it, why the appraiser must be independent, and — if you’re tempted — why doing your own 409A is a bad trade.

What the process looks like, step by step

From your side, a 409A engagement is mostly a document hand-off followed by a short review. Here’s the shape of it:

1. You send the inputs. Cap table, historical financials, projections if you have them, your articles of incorporation and any term sheets (these define your preferred stock’s rights, which matter a lot), and any material contracts or letters of intent.
2. The appraiser values the business. Standard practice draws on the market approach (what comparable companies and transactions imply), the income approach (what your projected cash flows are worth), and — mostly for early-stage companies — the asset approach. If you’ve recently raised a priced round, expect a backsolve: working backwards from what investors just paid for preferred stock to what the whole company is worth.
3. The value gets allocated to common stock. This is the step founders find surprising. Your preferred stock has rights common doesn’t — liquidation preferences, most obviously — so common is worth meaningfully less per share than the preferred price from your last round. An option pricing model (OPM) or similar allocation method quantifies that gap, then a discount for lack of marketability is applied because private shares can’t be freely sold.
4. You get a report. A real one runs dozens of pages: methodology, assumptions, data sources, and the concluded FMV per common share. That number is your strike-price floor for the next 12 months or until a material event, whichever comes first.

Timelines vary enormously by provider — traditional firms commonly quote two to four weeks end to end; modern providers with structured intake are far faster. The walkthrough in how the 409A process works covers each step in more detail, and the methodology explainer unpacks backsolve, OPM, and friends properly.

How to choose a provider

The market splits into three rough archetypes. Bargain template mills sell speed and price, and produce reports that read like everyone else’s — those are the ones that get rejected in diligence. Big Four firms produce rigorous work at a premium, often executed by junior staff you’ll never meet. Specialists do private-company equity valuation as their core business — that’s where most startups should look, but the label is free, so screen for it.

Screen on outcomes, not marketing. Five questions to ask every provider:

• Audit-acceptance track record. Have their reports actually survived Big Four audits and pre-IPO diligence without being redone? Ask for specifics.
• Methodology transparency. Is the analysis shown — the backsolve, the OPM allocation, the assumptions behind each input — or black-boxed? If they won’t show the work, an auditor won’t accept it either.
• A named human reviewer on every report. A specific person signs the analysis and can defend it later. “Our team reviews everything” is not an answer.
• Complex-instrument coverage. SAFEs, convertible notes, multi-class preferred stacks. If they’ve only valued clean single-class cap tables, yours becomes their learning experience.
• Audit support included. When your auditor calls with questions, does the provider defend the report as part of the engagement — or is that an upsell?

What about credentials? Letters after a name are neither necessary nor sufficient — the report’s track record under scrutiny is the test. The full screening checklist, including red flags, is in how to choose a 409A valuation provider.

What auditors and the IRS actually look at

Here’s the part the fear-based marketing gets backwards: the IRS rarely audits 409A in isolation. When it comes up, it’s usually inside a broader examination, and if you hold the independent-appraisal safe harbor, the examiner has to clear the “grossly unreasonable” bar to touch you. A competent, contemporaneous, well-documented report makes that nearly impossible.

The scrutiny you should actually plan for comes from auditors and acquirers. Pre-IPO financial audits and M&A due diligence both involve someone scrubbing your entire 409A history, looking for:

• Coverage gaps — periods where you granted options with an expired or missing valuation.
• Missed material events — a funding round, secondary, or acquisition offer with no refreshed valuation behind the grants that followed it.
• Conclusions that contradict the facts — a common FMV that ignores the priced round you closed a month earlier, or projections that don’t match the board deck.
• Cheap-stock problems — strike prices that look suspiciously low next to your IPO or acquisition price, which can force accounting restatements and delay the deal.

The fix for all of these is the same: valuations done on time, by an independent appraiser, with the reasoning written down. More in will a 409A valuation hold up in an audit.

What it should cost

Traditional firms price per valuation — commonly a few thousand dollars each time, which stings precisely because you need one at least annually plus after every material event. 409A.io prices it as a subscription instead: $99/month with a 12-month commitment, covering your initial audit-ready report and updates when those triggers hit, with human review on every report. The full market breakdown is in how much a 409A valuation costs.