INSIGHT

What Triggers a New 409A Valuation Before the 12-Month Window Expires?

Kemp Moyer • July 6, 2026

Services: Business Valuation Services

---

Most founders and finance leaders know the 12-month rule: under internal revenue code regulations, a 409A valuation expires one year after its effective date, and options granted after that point lose safe harbor protection. What catches companies off guard is the other half of the rule. Certain events reset that clock well before the year is up, and issuing options against a valuation that a material event has already invalidated carries the same compliance risk as using one that simply aged out.

This article walks through the specific triggers that require a fresh 409A valuation before the 12-month window closes.

The Rule Behind the Refresh

Under Treasury Regulation Section 1.409A-1(b)(5)(iv)(B), a 409A valuation safe harbor is presumed to reflect fair market value for 12 months following the valuation date, provided no material event has occurred. That phrase, “provided no material event has occurred,” is where most compliance problems start.

A material event trigger means that specific corporate or financial events reset the valuation requirement regardless of how much time has elapsed. The valuation is only valid through whichever comes first: the 12-month anniversary or the occurrence of a material event.

A New Funding Round

Closing a priced equity round, or even an unpriced material convertible funding instrument, is the most common mid-cycle trigger. A priced round specifically introduces new information about the company’s value. A negotiated price paid by sophisticated investors with full access to diligence materials means no reasonable argument can be made that a prior valuation, prepared before this transaction was known, still reflects fair market value.

The 12-month validity window that applied to the prior valuation is irrelevant once the round closes, and is in question as early as a term sheet being signed prior to close. Even if the last 409A was completed three months ago, it cannot be relied upon to set strike prices for options granted after the funding event.

This applies not only to priced preferred stock rounds but also to convertible note financings and SAFE agreements where the terms meaningfully affect the balance sheet and pro forma cap table. For companies navigating these events, choosing the right 409A valuation provider can make a material difference in how well the analysis holds up under review.

Mergers, Acquisitions, and Term Sheets

From a compliance standpoint, M&A activity is one of the highest-risk areas for relying on an outdated valuation. A signed term sheet for an acquisition can itself constitute a material event, even when the deal has not closed. Entering into or closing a merger with or acquisition of another company requires a new 409A valuation, aside from the most clearly immaterial of transactions.

The logic is straightforward with respect to a potential sell-side deal as well. A credible acquisition offer changes what a willing buyer would pay for equity today. Continuing to use a prior valuation after that offer arrives may materially understate what the company is worth, creating tax compliance risk and making valuation for M&A especially important before new grants are issued.

Secondary Transactions

Allowing founders or employees to sell shares in secondary transactions creates real market pricing data. Once secondary activity occurs, continuing to use an older 409A valuation can be difficult to defend, especially during audits or due diligence.

Not every secondary sale rises to the level of a material event, but completing a secondary transaction at a price that establishes a new data point for common stock value is widely recognized as one that does. When real market pricing enters the picture, a prior valuation built without that data becomes much more difficult to defend.

Significant Changes in Business Performance

Financial performance shifts can trigger a refresh even when no financing event has occurred. A significant increase in revenue, such as closing a contract that represents more than 25% of trailing annual revenue, is recognized as a material event.

Significant changes, whether positive or negative, to a company’s financial outlook count as material events. A valuation built on one set of projections loses its footing when actual results diverge substantially from those numbers.

Other Triggers Worth Knowing

The addition of top executives, introducing a major product or having a science or technology breakthrough, substantially pivoting a business model, or receiving a credible indication of interest for a significant transaction may also count as material events.

Companies approaching an IPO process face even tighter expectations. A company credibly approaching an IPO or SPAC deal will typically conduct 409A valuations more frequently, such as quarterly or even monthly.

What Happens If You Miss a Trigger

Non-compliance triggers immediate taxation of all vested options for affected employees, plus a punitive 20% penalty tax and elevated interest rates on unpaid obligations. These penalties can compound across multiple years, creating potentially significant financial burdens for employees.

Companies whose employees later discover this risk through M&A diligence or IPO preparation face legal claims from employees seeking compensation for the tax burden they did not plan for. This is one of the most common hidden liabilities identified in startup M&A transactions.

Working With BPM

Staying on top of 409A triggers requires someone actively watching for the events that reset the clock early, and that kind of oversight is easier when you work with a team that understands both valuation mechanics and the business, tax and financial reporting risk context behind them. BPM’s business valuation services work with companies at every stage, from emerging growth to IPO, delivering defensible 409A valuations that hold up to audit and investor scrutiny.

If your company has recently closed a financing round, seen meaningful shifts in revenue, or received acquisition interest, the timing of your next option grant matters more than you might think. Contact BPM’s Business Valuation team to find out whether a mid-cycle refresh is needed before you issue another grant.