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The Smarter Startup

The Role of Convertible Debt and SAFEs in Fundraising

Convertible debt or SAFE? Learn how these popular tools affect your valuation, dilution, and investor dynamics.

This article is the second installment in a three-part series focused on important valuation and dilution considerations during fundraising. Also see part-one: Avoiding Startup Valuation Traps: 409A vs. Fundraising. Next week I’ll conclude the series with a look at how to model dilution to plan smarter fundraises.


Early-stage startups often raise capital through convertible debt or Simple Agreements for Future Equity (SAFEs) instead of priced equity rounds. These instruments allow startups to delay formal valuation discussions but come with distinct trade-offs.

1. SAFEs: Deferring Valuation with Simplicity

Introduced by Y Combinator, SAFEs are designed as a simple alternative to traditional debt or priced equity rounds. SAFEs convert into equity at a future financing round under predetermined terms.

Key Terms:

  • Valuation Cap: Sets the maximum price at which the SAFE converts, providing clarity without fixing the current valuation.
  • Discount Rate: Offers early investors a reduction (e.g., 20%) on the next round’s valuation.

Why SAFEs Appeal to Founders:

  • Not Debt Obligations: SAFEs aren’t loans—no interest, no repayment, no financial pressure.
  • Minimal Negotiation: Only valuation cap and/or discount rate need to be agreed upon, speeding up fundraising.
  • Founder-Friendly: No maturity date, avoiding pressure to meet deadlines that could lead to unfavorable terms.

⚠️ A Word of Caution: Issuing too many SAFEs without tracking dilution can lead to unexpected equity loss when they convert into shares.

2. Convertible Debt: Structured Financing with Risks

Convertible debt is a loan that converts to equity at a future date. It offers investors more protection but introduces financial risk and negotiation complexity.

Key Features:

  • Interest Accrual: Typically 5-8% annually, increasing the amount converted into equity.
  • Maturity Date: Usually 12–24 months. If no funding round occurs by this date, repayment may be required.
  • Repayment Risk: Investors may demand repayment if the company fails to raise a qualifying round.

Key Differences Between SAFEs and Convertible Debt:

SAFE Convertible Debt
Debt or Equity Equity-like Loan converting to equity
Interest None 5-8% annually
Maturity Date None 12-24 months
Repayment Risk None Yes (if no conversion or funding event)
Negotiation Complexity Low (valuation cap, discount) Higher (interest, maturity, conversion terms)

SAFEs help postpone valuation discussions, but they don’t eliminate the need for careful planning, especially regarding valuation caps and dilution effects. From inception, founders must adopt a proactive and informed approach, conduct thorough research, seek expert advice, and engage in transparent communication with investors.

Join me next week for the third and final part of this series, where we’ll tackle equity dilution. While dilution is a normal part of fundraising, it needs to be managed carefully to protect ownership and company value. We’ll cover key concepts, important terms, and walk through a real-world example.