Convertible Notes vs SAFE: Which Should You Use?
When raising an early-stage funding round, founders typically choose between two instruments: convertible notes and SAFE notes. Both are designed to delay valuation until a later priced round, but they work differently and have distinct advantages.
Key Takeaway
SAFE notes are generally simpler and more founder-friendly for early-stage rounds. Convertible notes add debt complexity but may be preferred in certain situations or by certain investors.
What Is a Convertible Note?
A convertible note is a debt instrument that converts to equity in a future financing round. It's essentially a loan that converts to stock instead of being repaid with cash.
Key characteristics:
- Has a principal amount and interest rate (usually 2-8%)
- Has a maturity date (when it must be repaid if no conversion)
- Converts at a discount (usually 10-20%) to the next round's price
- May have a cap (maximum valuation for conversion)
What Is a SAFE Note?
A SAFE (Simple Agreement for Future Equity) was created by Y Combinator in 2013 as a simpler alternative to convertible notes. It's not debt—it's a warrant that gives the right to purchase equity in a future round.
Key characteristics:
- No principal amount or interest
- No maturity date
- Converts at a discount to the next round's price
- May have a cap
- Comes in 4 variations: Cap + Discount, Cap Only, Discount Only, MFN
Side-by-Side Comparison
| Feature | Convertible Note | SAFE Note |
|---|---|---|
| Type | Debt instrument | Equity warrant |
| Interest | ✓ Yes (2-8%) | ✗ No |
| Maturity Date | ✓ Yes (typically 18-24 months) | ✗ No |
| Repayment Risk | ✗ Must repay if no conversion | ✓ Never requires repayment |
| Legal Complexity | ✗ Higher | ✓ Lower (standardized) |
| Document Length | 5-10 pages | 2-5 pages |
| Investor Preference | Mixed | Increasingly preferred |
Pros of Convertible Notes
- Investor protection: Interest provides some return if conversion takes longer than expected
- Maturity creates urgency: Forces a conversation if no financing happens
- Familiarity: Some traditional investors prefer debt structures
- Tax treatment: May have different tax implications for investors
Cons of Convertible Notes
- Repayment risk: If no conversion happens, you must repay the principal + interest
- Complexity: Requires more legal work and negotiation
- Distressed conversion: At maturity, investors may force unfavorable terms
- Balance sheet impact: Shows as debt (can affect other financing)
Pros of SAFE Notes
- Simplicity: Standardized documents, faster closing
- No repayment: Never requires cash repayment
- No maturity: No pressure to convert by a deadline
- Founder-friendly: Designed with startup founders in mind
- Widely accepted: Most early-stage investors now use SAFEs
Cons of SAFE Notes
- No interest: Investors get no return for time value
- No deadline: Can linger indefinitely if no priced round happens
- Less protection: Investors have fewer protections than with notes
When to Use Convertible Notes
Use Convertible Notes If:
- Investors specifically request debt structure
- You're raising from traditional debt investors
- You want to signal that you expect to raise a priced round within a specific timeframe
- Your jurisdiction has legal limitations on SAFEs
When to Use SAFE Notes
Use SAFE Notes If:
- You're raising from angel investors or early-stage VCs
- You want the simplest, fastest closing possible
- You don't want to worry about repayment risk
- You're in a market where SAFEs are standard (most US tech hubs)
Key Terms to Negotiate
Whether you choose notes or SAFEs, these terms matter:
- Valuation Cap: The maximum valuation at which your investment converts. Lower caps are better for investors, higher caps for founders.
- Discount: The percentage discount to the next round's price. Typical range: 10-20%.
- Pro Rata Rights: Right to invest additional money in the next round to maintain ownership percentage.
- Most Favored Nation (MFN):strong> If you give better terms to a later investor, earlier investors get those terms too.
- Maturity Date (notes only): When the note must be repaid or converted. Shorter is riskier for founders.
- Interest Rate (notes only): Usually 2-8%. Lower is better for founders.
Real-World Example
You raise $500,000 on a SAFE with a $5M cap and 20% discount.
Six months later, you raise a Series A at a $10M pre-money valuation.
- Without cap/discount: $500,000 / $10M = 5% ownership
- With 20% discount only: $500,000 / ($10M × 0.8) = 6.25% ownership
- With $5M cap only: $500,000 / $5M = 10% ownership
- With both (Cap applies): 10% ownership (cap is better for investor)
The Verdict
For most early-stage startups raising from angels or seed-stage VCs, SAFE notes are the better choice. They're simpler, faster, and don't create repayment risk.
Convertible notes make sense in specific situations—when investors request them, when dealing with debt-focused investors, or when you need the discipline of a maturity date.
💡 Pro Tip
Most startups can raise multiple SAFE rounds (Seed SAFE, Series A SAFE) before doing a priced round. Use our SAFE Calculator to model how multiple SAFEs convert at different valuations.
Calculate Your SAFE Conversion
Model how your SAFE notes will convert at your next priced round with cap, discount, and MFN calculations.
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