Guide to 409A valuations for startups

If your UK startup employs US taxpayers or is building a US presence, equity comes with an extra admin milestone, the 409A valuation. This guide explains what it is, the core 409a valuation requirements, how often a 409A valuation is required, and what typically drives 409A valuation cost.

And because international growth rarely stops at cap tables, it also touches on how Wise Business can help founders manage cross-border funding and payments with less FX friction, whether you’re receiving investor money in USD, paying valuation providers abroad, or settling international vendor bills in the currency they actually use.

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The contents of this article is for informational purposes only and does not constitute legal or tax advice. Decisions related to tax should be made after thorough research, consultation and verification from a qualified financial and legal advisor.

What is a 409A Valuation?

A 409a valuation is an independent appraisal that determines the fair market value (FMV) of a private company’s common stock, and it’s primarily used to set the minimum strike price for stock options granted to employees, advisors, and other service providers under US tax rules (Section 409A of the US Internal Revenue Code).

Think of it as the paper trail that shows your option strike price was calculated properly, not just decided in a board meeting and hoped for the best. It is an appraisal of the FMV of a company’s common stock, designed to ensure equity compensation is priced in a way that’s reasonable and defensible under IRS regulations.¹

For UK startups, this usually becomes relevant when you’re issuing equity to US taxpayers, setting up a US parent (for example after a restructure), or otherwise needing US-compliant option pricing. If you employ US taxpaying citizens and offer them shares or share options, you’ll need a 409A valuation completed.¹ Another core reason is when UK founders begin raising funding from US investors, where US tax and equity rules can apply.

It’s also separate from anything you've dealt with under HMRC's employee share scheme processes, including EMI valuations. A 409A is a US framework with its own rules and consequences, and the two don't overlap.²

What is the difference between post-money valuation and 409A valuation?

Post-money valuation is a fundraising metric based on what investors pay for preferred shares, often expressed as “price per preferred share x fully diluted shares.” A 409A valuation, by contrast, is a tax compliance appraisal used to set the FMV of common stock for option strike prices, and it is often lower because common shares typically lack preferred rights like liquidation preferences and other protections.

Founders often encounter valuation questions after fundraising. Understanding how to find investors for your startup can also help clarify how funding rounds affect equity pricing.

Why your company needs a 409A Valuation

If your company is granting options to US taxpayers, a 409A valuation is less optional than it might first appear. It's a practical control that supports compliance, reduces tax risk for option holders, and gives your equity programme the structure it needs to scale properly rather than being reinvented every time you make a new hire.

To meet IRS compliance and avoid painful penalties

Section 409A is part of the US tax code governing certain deferred compensation arrangements, and stock options are one of the big areas where startups run into it. The basic idea is simple: if options are granted below fair market value, the IRS can treat this “discount” as taxable compensation with additional penalties.

The consequences are real. When options are underpriced without a proper 409A valuation, employees can face immediate income recognition, an additional 20% federal penalty, and accrued interest, all before they've exercised a single option or received any cash to cover the bill.

In short: getting a 409A valuation is less about pleasing a regulator and more about preventing an equity promise from turning into a liability.

To access the 409A safe harbor

Founders often ask what “safe harbor” actually buys them. The practical benefit is audit defensibility. The 409A safe harbor has a presumption that the valuation is reasonable when it’s done properly using accepted methods, which can protect the company and employees from IRS penalties related to option pricing.¹

Critically, with safe harbor, the burden of proof shifts. Instead of you proving your valuation is right, the IRS must show it’s grossly unreasonable.³ Most startups go the independent appraisal route for exactly this reason. The report gives you something concrete to point to if the IRS ever questions your option pricing.

To hire globally with equity that feels credible

Equity only motivates when people trust the rules are fair and the upside is real. A defensible 409A valuation gives investors and acquirers something concrete to work from during diligence, rather than having to relitigate your equity pricing mid-deal.

For UK startups expanding internationally, credibility also shows up in operational detail: paying international contractors on time, budgeting in multiple currencies, and keeping clean records when you’re juggling UK and US advisors. That’s where Wise Business can be a useful piece of infrastructure alongside your equity admin, helping you receive and send money internationally while seeing the mid-market exchange rate and fees separately before you convert.

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How often do you need a new 409A Valuation?

Founders usually want the clean rule first, then the exceptions. The clean rule is that a 409A valuation is valid for a maximum of 12 months, and you need a refresh sooner if a material event occurs that could affect the company’s value.⁴

Material events that can trigger a refresh include:⁴

• Closing a new financing round (priced round, SAFE, or convertible note)
• A credible acquisition offer or term sheet
• A major change in financial projections or outlook
• Major operational developments that materially affect company performance
• Changes to capitalisation or ownership structure
• Secondary sales or tender activity that provides new market pricing signals

The valuation process itself can take several weeks, so planning ahead matters if board meetings or equity grant cycles are approaching. In practice, many startups treat a 409A valuation as a regular compliance task. They refresh it once a year, and again after major events such as a funding round.

If a valuation becomes outdated while a company is hiring quickly, it can delay option grants or slow down offers to new employees. For companies operating in both the UK and the US, it also helps to align valuation updates with funding milestones and hiring plans so compensation and financial planning stay consistent.

How to calculate 409A Valuations?

There isn’t one universal calculation for a 409A valuation. Instead, valuation providers select approaches that fit your stage, data quality, and capital structure, and they document why those choices are reasonable. However, three common methods include market, income, and asset approaches.

Market approach (including OPM backsolve)

The market approach estimates value by comparing your company to similar public companies or recent M&A transactions, and/or by using the economics of your most recent fundraising as market evidence. This approach can suit early-stage startups that have difficulty forecasting long-term performance, since the method anchors on market comparables and transactions.

After a financing round, providers often use an Option Pricing Model (OPM) backsolve method as it’s assumed new investors paid FMV for preferred equity, and then adjustments and modelling are used to infer the implied total value and derive common stock FMV.⁵

Income approach: Discounted Cash Flow(DCF)

Another method sometimes used is discounted cash flow (DCF). It estimates the company’s future earnings and converts them into a present-day value.⁶ This is typically best suited to companies with more predictable revenue and projections that can be defended. In practice, the quality of your forecasts matters as much as the formula, so it’s worth keeping assumptions consistent with board decks, budgets, and hiring plans.

Asset (cost) approach

The asset (or cost) approach estimates value based on the fair market value of assets minus liabilities,⁷ which can be relevant for very early-stage companies or those where tangible assets are a meaningful driver. It’s often used for very early-stage companies that have not raised money or generated revenue.

This approach is less common for SaaS startups, where most value comes from intangible assets like software and intellectual property. Still, it can be used depending on the company’s circumstances.

What does the 409A valuation process look like?

A 409A valuation process is usually straightforward when your documents are organised and your cap table is accurate, but it’s still a multi-step workflow with dependencies. It typically follows a process like this:

• Select a qualified independent provider and agree the valuation effective date
• Prepare and share documents (cap table, financing docs, historicals, forecasts, narrative context)
• Kick off with the analyst to discuss business model, milestones, risks, and plans
• Market research is performed, security terms are reviewed, and the methodology is chosen
• Provider runs valuation models (market/income/asset plus allocation like OPM/backsolve)
• Receive and review a draft report for factual accuracy
• Provider issues the final report and supporting documentation
• Board adopts the FMV and uses it to set strike prices for new option grants
• Store the report for audit support, due diligence, and future value updates

What does a 409A valuation report include?

A 409A valuation report should be detailed enough that a third party can understand what was valued, when, and how, and why the conclusion is reasonable. There’s no single template, but it does contain core elements such as the valuation itself, the methods used, and information about the independent specialist.

The report is likely to contain:⁸

• Valuation date and FMV conclusion: The effective date and per-share FMV of common stock
• Company overview: What the company does, market context, milestones, risk factors
• Capitalisation and securities: Cap table, option pool, preferred rights, convertibles
• Financial review: Historical statements and forward-looking projections used
• Valuation methodologies: Market, income, asset approaches and rationale for selection
• Allocation framework: How value is allocated across classes (e.g., OPM)
• Key assumptions: Discount rates, volatility inputs, scenarios, marketability concepts
• Appraiser credentials and independence: Evidence supporting safe harbor defensibility

Founders don’t need to memorise every page, but it’s smart to understand the headline FMV, the valuation date, what method drove the result, and which assumptions are most sensitive. This becomes especially important after fundraising or major milestones, when team members notice strike prices change and want an explanation that’s clear and consistent.

How much does a 409A valuation cost?

Costs vary depending on the company’s stage and complexity. Early-stage startups with relatively simple capital structures often pay around $2,000 to $5,000 for a 409A valuation.⁹ More mature companies with larger operations or complex share structures may pay significantly more, particularly when working with large accounting firms or when additional analysis is required.

For UK startups, it’s also worth remembering the currency context: you may be paying US valuation providers in USD, and if you’re budgeting in GBP, FX and transfer fees can quietly inflate the total cost if you’re not paying attention. Using Wise Business can help keep this tidy by letting you hold and pay from USD balances when appropriate, while seeing the mid-market exchange rate and Wise’s fee separately when you do need to convert, which makes the actual easier to track.

Scale your startup globally with Wise Business

A 409A valuation is ultimately about control: controlling how equity is priced, documented, and defended as you grow. The same mindset helps when your startup starts moving money across borders every week, not just during fundraising.

With Wise Business, UK-based startups and scale-ups can build a finance setup that’s ready for international hiring, US vendors, and global expansion without drowning in hidden FX markups or surprise fees.

Wise Business lets businesses hold and manage money in 40+ currencies and get local account details in 8+, which can make receiving investor funding and paying overseas partners feel more like domestic banking. Founders can also send money to 140+ countries with transparent pricing, at the mid-market exchange rate - helping keeping international payments low.

With Wise Business, you can:

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• 👥 Run payroll and make international payments for up to 1,000 employees all over the world

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Sources used:

1. 409A-1 - Definitions and covered plans – Cornell Law School
2. Tax and Employee Share Schemes – GOV.UK
3. Internal Revenue Bulletin: 2007-19 – IRS
4. 16 Things to Know About the 409A Valuation – Andreessen Horowitz
5. Prepare for the IPO Process with Key Valuation Considerations – Moss Adams
6. Discounted Cash Flow DCF Formula – Corporate Finance Institute
7. Which Business Valuation Method Should be Used for Your Company? – Seldon Fox
8. 409A Valuation Report Example – Eqvista
9. What is the cost of a 409a Valuation? – Eqvista

Sources last checked: 25-March-2026