Whether a convertible note will actually decrease your 409A valuation depends on its size, terms, and how your valuation provider models it in your startup accounting and cap table. In some cases, a sizable, investor-friendly note can put real downward pressure on your common stock fair market value; in others, it may have little to no impact.
Quick refresher: 409A and convertible notes
A 409A valuation is an independent appraisal of the fair market value (FMV) of your common stock, used to set employee option strike prices that comply with IRS rules. A convertible note is short-term debt that typically converts into preferred stock in a future priced equity round, often with a valuation cap and/or discount.
The cap on a convertible note is a maximum company valuation used to calculate the investor’s conversion price in a future priced round, which means early investors convert as if the company were worth no more than that capped amount, even if the actual valuation is higher. The discount is a percentage reduction from the next round’s share price (for example, 20% off), letting noteholders convert into equity at a lower price per share than new cash investors in that round as a reward for their earlier risk.
Key points:
- For 409A purposes, valuation firms often treat convertible notes as “quasi-equity,” assuming they will convert rather than be repaid.
- The note’s economics (cap, discount, interest) affect how much value is left for common stock.
- Issuing a meaningful note round is usually a “material event” that can trigger the need for a new 409A valuation.
From a startup accounting standpoint, the note appears as a liability, but your 409A provider focuses on how that liability and its conversion terms change the waterfall to common shareholders. A “waterfall” is the order that determines how a company’s total value or exit proceeds are distributed across all securities – debt, preferred, convertibles, and common stock. It specifies who gets paid first, how much they receive, and how any remaining value “cascades” down to the next group of stakeholders.
When a convertible note can decrease your 409A
A convertible note can decrease the 409A-per-share value of common stock when its terms are dilutive enough that common shareholders bear more downside than upside.
Situations where a lower 409A is more likely:
- Large note relative to company value. If you raise a big note (for example, a multi-million dollar round at an early stage), the debt and its future conversion can meaningfully dilute common, which can justify a lower FMV for common stock.
- Aggressive valuation cap and discount. A low cap and steep discount let noteholders buy in at an effectively lower price than future preferred investors, shifting value away from common and potentially pulling the 409A down.
- Stacked notes or multiple tranches. Several outstanding notes, especially with different caps and side letters, can create heavy overhang that reduces what’s left for common in a liquidation or exit model.
- Weak fundamentals at the time of the note. If the note is raised to extend runway without strong traction, your valuation firm may view the note as more protective for investors than value-creating, further constraining the common stock FMV.
In these scenarios, using milestones, scenario analysis, and defensible assumptions in your startup accounting model helps support a lower, but still compliant, 409A.
When a convertible note may not lower 409A
A convertible note does not automatically push your 409A valuation down; in many cases, it can support a higher enterprise value while leaving the common FMV relatively stable.
Cases where a note may have little or no downward effect:
- Small note relative to prior financing. A modest bridge on top of a large priced round often doesn’t materially change the capital structure or risk profile.
- High valuation cap. If the cap is well above your current implied enterprise value, it signals confidence and leaves plenty of upside for common, limiting any downward pressure on FMV.
- Strong business momentum. If the note funds clear growth (for example, strong revenue, improving unit economics), the overall enterprise value may rise enough that common FMV stays flat or even increases.
- Clean, recent 409A already incorporating the note. If you obtain a new 409A shortly after the note and nothing else material changes, subsequent option grants can keep using that value for up to 12 months under the safe harbor.
In other words, the presence of a convertible note is one input into the valuation, not a guarantee of a lower strike price.
How valuation firms actually treat notes
Valuation providers use your financial statements, cap table, and note documents to model how value flows to each class of security. For startups, they commonly rely on methods like option-pricing models (OPM) or backsolve techniques that allocate enterprise value across preferred, convertible instruments, and common.
Typical treatment of convertible notes in 409A:
- Assumed conversion. Notes are usually treated as if they will convert into preferred, not be repaid, unless a near-term repayment scenario is clearly more likely.
- Included in the waterfall. Notes and accrued interest get modeled as part of the capital stack, often ahead of or alongside preferred, which pushes common down the waterfall.
- Caps and discounts fully reflected. The valuation cap and discount are explicitly modeled, which can give noteholders more value per dollar than other investors or founders.
- Material events trigger new valuations. Closing a significant note round generally invalidates your prior 409A for new option grants, requiring a fresh valuation built on the updated capital structure.
Because this modeling is technical, clean startup accounting and a complete set of legal documents are critical for a defensible 409A.
Startup accounting best practices around notes and 409A
Early coordination between your finance, legal, and 409A provider can help you avoid compliance issues and unexpected option price shocks.
Practical steps for founders and finance teams:
- Keep cap table and note schedules accurate. Track each note separately (principal, interest, cap, discount, maturity) in your accounting and equity systems so your valuation firm can model them correctly.
- Flag material events early. Treat new note rounds, major extensions, or amendments as triggers to revisit whether you need an updated 409A.
- Don’t use the cap as your strike price. A valuation cap is not the FMV of your common stock. Relying on it instead of an independent 409A can create serious 409A tax exposure.
- Time option grants carefully. If you know a big note or priced round is imminent, consider the timing of grants relative to the new 409A you’ll need once that financing closes.
- Partner with specialized startup accounting support. Teams that focus on venture-backed startups understand the nuances of convertible instruments, waterfalls, and 409A requirements.
How Kruze helps with notes and 409A
Kruze Consulting’s startup accounting practice works with hundreds of venture-backed companies managing SAFEs, convertible notes, and priced rounds alongside recurring 409A valuations. We help founders:
- Maintain accurate GAAP financials and detailed note schedules that valuation firms trust.
- Model how new notes and caps could influence future common stock FMV before you finalize terms.
- Coordinate timing between financings, 409A valuations, and option grants to stay compliant while keeping option strike prices as fair as possible.
If you’re considering a convertible note and want to understand how it might affect your next 409A valuation, Kruze’s startup accounting experts can walk through scenarios, align your documentation, and help you work smoothly with your valuation provider.
