Convertible Note

How Convertible Notes Work: The Math of Conversion

The mechanics of a convertible note are built around the "Incentives" given to the early investor to compensate them for taking more risk than the people who come later. There are four primary levers in a note: the Principal, the Interest Rate, the Discount, and the Valuation Cap. The Principal is the amount of cash invested. The Interest Rate (usually 4-8%) is not paid in cash; it "Accrues" over time, meaning it is added to the principal so that the investor gets even more shares when the conversion happens. If you invest $100,000 and the note lasts two years, you might convert $115,000 worth of value into stock. The most critical lever is the Discount Rate. Because the early investor took a risk when the company was just an idea, they shouldn't pay the same price as the Series A investors who are buying in once the company has millions in revenue. A standard discount is 20%. This means if the Series A investors pay $1.00 per share, the note holder only pays $0.80 per share. This "Instant 20% Gain" is the reward for being the first person to believe in the founder. The ultimate protection for the investor is the Valuation Cap. This is a "Safety Ceiling" on the price the investor will pay for shares. Imagine a startup raises a convertible note with a $5 million cap. A year later, the startup becomes a sensation and raises a Series A round at a $50 million valuation. Without a cap, the early investor’s $100,000 would buy a tiny 0.2% of the company. But with the $5 million cap, the investor gets to convert their money as if the company was only worth $5 million, giving them a 2% stake instead. The investor always gets the "Better of the Two Deals"—either the Discount or the Cap—whichever results in them owning a larger piece of the company.

Important Considerations: The "Maturity Date" and "Liquidation Preference"

The greatest danger for a founder using convertible notes is the "Maturity Date." Because the note is technically a loan, it must have a date (usually 18-24 months) by which it is either converted or repaid. If the startup fails to raise a Series A round before that date, the investors have the legal right to demand their cash back. Since most startups spend all their cash on growth, they don't have the money to pay. This creates a "Negotiation Crisis." The investors can use this leverage to force the founder to give up more equity or to take over the board of directors. A maturity date is a "Ticking Clock" that adds immense pressure to the fundraising process. Another critical consideration is "Liquidation Preference Overhang." When a note converts into equity, it usually converts into "Preferred Stock." Preferred stock comes with special rights, such as being paid first if the company is sold. If a founder raises multiple rounds of convertible notes, each with its own accrued interest and valuation caps, they can end up with a "Clogged Capital Stack." This means that if the company is sold for a modest amount (e.g., $20 million), the preferred stockholders might take all the money, leaving the founder and the early employees with nothing for their years of hard work. Finally, you must understand the "Conversion Trigger." Not every investment triggers a conversion. Most notes require a "Qualified Financing"—a round of a certain size, like $1 million or more—to force the conversion. If the startup raises $250,000 from a few more friends, the note stays a note. This is designed to ensure the early investors don't get "Priced" by a small, non-professional round. However, if the company never raises a large round but stays profitable and "Small," the note can stay in "Limbo" for years, which can be frustrating for investors who want to see their names on the cap table as owners rather than lenders.

Convertible Note vs. SAFE (Simple Agreement for Future Equity)

Two competing methods for funding early-stage startups. Understanding which one to use is vital.

The "Startup Founder’s" Note Checklist

Before signing a convertible note, ensure you have negotiated these seven key terms:

• Valuation Cap: Is it high enough to prevent "Excessive Dilution" if you succeed?
• Discount Rate: Is it standard (20%) or is the investor asking for too much (30%+)?
• Interest Accrual: Does the interest "Compound" or is it "Simple Interest"?
• Change of Control: If you are bought tomorrow, does the investor get 1x or 2x their money?
• Maturity Extension: Do you have a "Pre-negotiated" option to extend the loan for 6 months?
• Pro-Rata Rights: Does the investor have the right to buy more shares in your Series A?
• Board Observer Rights: Is the investor demanding a seat at the table before they are an owner?