Early-stage founders raising for the first time often don’t know which instrument to reach for: SAFE or convertible note. So here’s a breakdown of each!
The SAFE
A SAFE (Simple Agreement for Future Equity) is not a loan.
You give a startup money today, and in return you get a contractual right to receive equity later: typically when they raise a priced round.
There’s no interest, no deadline, and no repayment obligation.
When the priced round happens, your SAFE converts into preferred shares.
The price you convert at depends on whichever of these gives you the better deal:
Valuation cap = a ceiling on the price per share used to calculate your conversion. If the startup raised at a $5M cap and their Series A values them at $15M, you still convert as if the valuation was $5M. You get more shares than the new investors paying full price.
Discount rate = typically 10-25%
Investors always get whichever yields the lower price per share.
SAFEs are fast and cheap to close (often days, ~$1-3K in legal fees).
But stack several SAFEs with different caps, and by Series A you might have accidentally given away 20%+ without ever seeing it coming…
The MFN clause
If you issue SAFEs to multiple investors at different times, a Most Favored Nation (MFN) clause lets earlier investors upgrade to better terms if you gave a later investor a sweeter deal.
So if you gave your seed investor a $5M cap, then gave a later angel a $4M cap, your original investor can elect to match those terms.
What happens if you get acquired before Series A?
Most SAFEs include a liquidity event clause: if you get acquired before a priced round, SAFE holders participate in the exit upside, usually by converting into common shares at their capped price.
Say you raised $500K on a $5M cap SAFE, and you get acquired for $8M.
Your SAFE investor converts as if the company was worth $5M, meaning they own 10% of the company at exit.
On an $8M acquisition, that’s $800K back on a $500K check: a 1.6x return.
The convertible note
A convertible note is a loan that’s designed to become equity.
Same conversion mechanics as a SAFE (valuation cap, discount rate) but structurally, you’re a creditor first.
The startup owes you money until the note converts.
What that adds:
Interest accrual: typically 4-8% annually. It accumulates on top of your principal. More patience = more shares.
Maturity date: usually 18-24 months. If the startup hasn't raised a priced round by then, they have to repay you in full, negotiate an extension, or default.
If the company folds (goes bankrupt) before conversion, noteholders have a senior claim over equity holders.
Tradeoff: more investor protection, but also more legal complexity ($5-20K+) and a hard clock ticking on the founder’s runway.
In practice, most founders don't repay at maturity; they negotiate an extension.
But that negotiation happens from a weak position.
You're coming to your investor hat in hand, asking for more time.
Some investors use it to push for better terms, lower caps, or even equity conversions at a founder-unfavorable price.
The rolling close problem
If you’re raising from multiple angels in a rolling close, SAFEs are almost always cleaner than convertible notes.
Multiple notes means multiple interest start dates, multiple maturity deadlines, and multiple sets of investors who may not all agree to extend at the same time.
When to use which…
Use a SAFE when you’re pre-traction, need to move fast, and your investors are angels or early-stage funds comfortable with minimal protections. But try to keep your caps consistent across investors!
Use a convertible note when your investors want more legal protection, you’re bridging to a known priced round on a defined timeline, or you’re in a region where debt instruments are more standard.
Neither instrument gives investors equity today.
Both defer the real ownership conversation to whenever you raise a priced round.
The difference is how much pressure (legal, financial, timeline) you’re carrying in the meantime!