Hi, I’m Chris Walton, author of this guide and CEO of Eton Venture Services.
I’ve spent much of my career working as a corporate transactional lawyer at Gunderson Dettmer, becoming an expert in tax law & venture financing. Since starting Eton, I’ve completed thousands of business valuations for companies of all sizes.
Read my full bio here.
A 409A valuation sets the fair market value of a private company’s common stock for option grants, but that value only reflects a snapshot in time.
As the business changes, the valuation needs to be updated to ensure equity grants hold up under audit, diligence, and regulatory review.
Below, we explain how often 409A valuations should be updated, what events trigger a refresh, and why timing matters more than most teams expect.
In practice, the rules are straightforward, but applying them correctly requires understanding when a valuation remains defensible and when it no longer represents the value of your business.
Here’s when a private company needs a new 409A valuation:
A company must have a 409A valuation in place before issuing stock options to employees or contractors. There is no grace period and no practical way to establish a defensible fair market value retroactively once equity has been granted.
If options are issued without a 409A, safe harbor protection is forfeited from the start, exposing the company to increased IRS scrutiny, employee tax risk, and avoidable audit and diligence friction down the line.
A 409A valuation is generally considered current for up to 12 months, provided no material events occur during that period.
This 12-month window is often misunderstood as a default schedule. It represents the maximum lifespan of a valuation under IRS safe harbor guidelines, not a guarantee that the valuation remains valid for the entire year.
If the company’s circumstances remain stable, an annual update is typically sufficient. If not, the clock effectively resets sooner.
A 409A valuation should be updated whenever a material event occurs that could reasonably affect the fair market value of the company’s common stock. These events invalidate key assumptions underlying the prior valuation, even if the 12-month period has not expired.
Common material events include:
In these situations, continuing to rely on an outdated valuation increases the risk that option strike prices no longer reflect fair market value. This is why 409A timing is less about the calendar and more about aligning valuation updates with real business decisions.
While the formal update rules remain the same, how often companies refresh their 409A valuation tends to change as the business matures.
Early-stage companies typically operate with fewer valuation-moving events and less frequent equity activity. Option grants often happen in batches, fundraising is episodic, and financial performance is still forming. In this environment, annual valuations are usually sufficient, provided no material changes occur.
As companies scale, valuation timing becomes more dynamic. Growth-stage businesses issue equity more continuously, raise capital more frequently, and face increasing scrutiny from auditors and investors.
By the time a company reaches later-stage or pre-liquidity phases, it’s common to move to semi-annual or even quarterly valuation updates to support ongoing grants, maintain audit readiness, and reduce the risk of relying on outdated assumptions.
Related Read: What to Look for in a 409A Valuation Provider
Boards and investors look at 409A timing through different lenses, but both treat it as a signal of how disciplined the company is around equity and governance.
For boards:
The issue is fiduciary and procedural. Boards (or compensation committees) are typically responsible for approving equity grants and option plans.
That approval is only defensible if the strike prices are based on a fair market value that reflects the company’s facts at the time of the grant.
When a valuation lags behind a financing, major revenue change, or strategic shift, the board inherits unnecessary risk, ranging from option repricing to audit scrutiny, despite having relied on management and advisors to flag when an update was needed.
For investors:
Investors focus on timing primarily because of diligence and cleanup risk. A stale or poorly timed 409A often surfaces during financings, secondary transactions, or exit prep, forcing last-minute valuation work, retroactive analysis, or corrective disclosures.
Sophisticated investors view this as avoidable friction and expect companies to refresh valuations when events materially change the assumptions underlying equity compensation, especially when missteps could spill over into employee tax issues and affect their morale.
Both groups expect 409A timing to track real business decisions, not just the calendar. Companies that manage it this way tend to move through financings, audits, and equity reviews with far fewer surprises.
An outdated or invalid 409A valuation creates real exposure to tax penalties, compliance risk, and investor scrutiny, even if the company acted in good faith. The most common consequences include:
For private companies, staying current avoids unnecessary complexity and risk after equity has already been issued.
You might also like: 10 Key Documents Required for a 409A Valuation
A 409A valuation is only as strong as the analysis behind it. Whether you’re granting options for the first time, refreshing an existing valuation, or responding to a recent financing or material change, Eton delivers valuations built to stand up to scrutiny.
Our team has completed over 10,000 409A valuations, with consultants trained at Big 4 firms and deep experience across startup stages.
Every report is 100% human-led, USPAP-compliant, and signed by qualified appraisers, ensuring your valuation meets IRS requirements and qualifies for safe harbor protection.
We design each engagement around your company’s needs:
We typically complete a 409A valuation in ten days, with an expedited 1-day turnaround available for tight deadlines.
If you’re looking for a valuation partner that combines technical rigor with practical guidance, Eton provides clarity, defensibility, and peace of mind, all without the Big 4 price tag.
Contact us to request your 409A valuation.
At Eton, most 409A valuations are completed in approximately 10 business days, assuming required documents are provided promptly.
For companies facing tight option grant or transaction deadlines, we also offer a 1-day expedited option.
Every valuation follows the same human-led, USPAP-compliant process and is signed by qualified appraisers, regardless of timeline. The difference is turnaround speed, not rigor or defensibility.
A strong valuation date is typically close to when equity will be granted, but not immediately before or after a major event like a financing, unless the valuation is intended to reflect that event.
Dates that straddle significant changes can misalign the valuation with the facts in effect at the time of grant, which can weaken defensibility.
At Eton, we help select an effective date based on your grant timing, recent or upcoming transactions, and fiscal-year considerations.
To qualify for IRS safe harbor, a 409A valuation must meet specific documentation, timing, and methodology standards. These include:
When these criteria are met, the valuation is presumed reasonable under IRS rules unless proven otherwise, significantly reducing tax and compliance risk around equity grants.
A 409A valuation that comes in too low can create real compliance exposure. If options are granted below fair market value and the IRS challenges the pricing, employees may face immediate income inclusion, penalties, and interest, and the company may lose safe harbor protection for those grants.
A valuation that’s too high can make equity compensation less effective. Higher fair market value means higher strike prices, which can reduce perceived upside for employees and complicate recruiting and retention.
The goal is a valuation that’s accurate and defensible, grounded in current facts and reasonable methodology, so your option pricing remains compliant while your equity program stays motivating.
Schedule a free consultation meeting to discuss your valuation needs.
Chris Walton, JD, is President and CEO and co-founded Eton Venture Services in 2010 to provide mission-critical valuations to private companies. He leads a team that collaborates closely with each client’s leadership, board of directors, internal / external counsel, and independent auditors to develop detailed financial models and create accurate, audit-ready valuations.
