SAFE vs Convertible Note: Which Fits Your Raise?

A SAFE and a convertible note both let a startup take money now and price the shares at the next priced round. The note is debt with interest and a maturity date, and the SAFE carries neither. On the same cap and discount they convert almost identically, so the choice turns on maturity, priority and who's investing.

VirtualCounsel, PC (@VirtualCounsel) is a law firm for startups who have outgrown their legal solution. Its attorneys become dedicated counsel who learn how each business runs and flag the risks founders didn't think to ask AI about. We draft and negotiate both instruments, and this guide reflects patterns we see in that work.

The Two Instruments in One Table

Here's how the two compare on the terms founders negotiate most. Sources are linked in the sections below.

What Is a SAFE?

A SAFE (simple agreement for future equity) is a contract. The investor pays now and gets shares later, usually when the company sells preferred stock in a priced round.

Y Combinator wrote the original SAFE as "a replacement for convertible notes," per its post-money SAFE user guide. The guide calls the current version "a one-document security."

The guide lists three post-money forms:

• Valuation cap, no discount: the standard form, with a post-money valuation cap.
• Discount, no valuation cap: a negotiated discount off the priced-round share price.
• MFN, no cap, no discount: the holder can adopt better terms from SAFEs the company issues later.

Y Combinator also publishes an optional pro rata side letter. It gives pro rata rights in the round where the SAFE converts.

A SAFE has no interest and no maturity date. Y Combinator says that means "no time or money spent dealing with extending maturity dates, revising interest rates or the like."

The SEC's investor bulletin flags the investor's side of that trade. SAFE holders hold no current equity stake, and the bulletin warns that "a SAFE may not be triggered," per Investor.gov.

For a longer walkthrough, see our deep dive on how SAFEs work.

Pre-Money vs Post-Money SAFE

The original SAFE was "standardized on a pre-money basis." Y Combinator says that made founder dilution hard to calculate precisely.

In 2018 it moved to the post-money SAFE. Each holder's stake is now the check divided by the post-money cap. SAFEs "are not diluted by each other," per the guide, but they're still diluted by the new money in the priced round.

Hypothetical: A founder signs a $200,000 SAFE at a $4 million post-money cap. That holder owns 5% going into the priced round ($200,000 divided by $4 million), before the new money dilutes everyone.

What Is a Convertible Note?

A convertible note is a loan that's meant to turn into stock. Our convertible note guide calls it "a short-term debt instrument that converts into equity at a future financing event."

Three terms set it apart from a SAFE:

• Interest: it accrues, and "interest usually converts to equity alongside principal," per our note guide.
• Maturity date: the date the note "becomes due if no qualifying financing occurs." Our guide puts the usual range at 18 to 24 months.
• Debt status: notes are "treated as indebtedness," so they rank ahead of outstanding SAFEs, per Y Combinator's guide.

Notes also carry a cap, a discount or both. Our guide puts typical discounts at 15% to 25% and interest at 4% to 8% a year.

The median note interest rate was 7% in Q3 2023, up from 6% for most of the prior year, per Carta.

There's no single market form for notes. Cooley GO's Seed Note package includes a term sheet, a convertible promissory note, an investor questionnaire and a board consent.

Hypothetical: A HealthTech startup issues a $300,000 note at 6% simple interest with a 24-month maturity. If the priced round closes in 12 months, $318,000 converts. If no round closes by month 24, the terms decide whether it converts, gets repaid or gets extended.

Conversion Math Compared on Identical Numbers

Here's one set of numbers run through both instruments. Every figure is hypothetical.

Hypothetical setup:

• Founders and the option pool hold 9,500,000 shares before the raise.
• One investor puts in $500,000.
• Valuation cap: $10 million. Discount: 20%.
• The note also carries 6% simple interest and converts after 12 months.
• The later priced round sells preferred stock at $2.00 per share.

Y Combinator's current forms offer a cap or a discount, so this SAFE's cap-plus-discount term is a negotiated variation. Per Carta's August 2026 report, 21% of capped post-money SAFEs also had a discount.

The SAFE

1. Locked-in stake: $500,000 divided by the $10 million post-money cap is 5%.
2. Company capitalization: 9,500,000 shares are the other 95%, so the total is 10,000,000 shares.
3. Cap price: $10,000,000 divided by 10,000,000 shares is $1.00 per share.
4. Discount price: $2.00 times 80% is $1.60 per share.
5. The investor takes the lower price, $1.00. $500,000 buys 500,000 shares.

The SAFE holder owns 500,000 of 10,000,000 shares, or 5.00%, before the new money comes in.

The Convertible Note

1. Amount converting: $500,000 plus 6% for one year is $530,000.
2. Cap price: in this hypothetical the cap is measured on the 9,500,000 shares before conversion. $10,000,000 divided by 9,500,000 is about $1.053.
3. Discount price: $2.00 times 80% is $1.60 per share.
4. The investor takes the lower price, about $1.053. $530,000 buys 503,500 shares.

The noteholder owns 503,500 of 10,003,500 shares, or about 5.03%, before the new money comes in.

Time changes the note's side. If the same note ran 18 months, $545,000 would convert into 517,750 shares. The SAFE stays at 500,000 shares no matter how long the round takes.

Note forms differ on how the cap is measured, so run your own documents through these steps. Our post on valuation caps in convertible instruments covers the cap in more depth.

When Do Investors Push for a Note?

Investors who ask for a note usually want one of three things: priority, a deadline or a return while they wait.

• Priority: as debt, a note ranks ahead of SAFEs if the company winds down, per Y Combinator's guide.
• A deadline: Carta says a maturity date "puts a bit of a deadline on the young startup" to raise again.
• Interest: accrued interest usually converts into more shares, as the math above shows.

Sector matters too. In the two years to November 2023, notes carried 45% of early capital in medical devices and 43% in pharma and biotech, per Carta. Standard SaaS put 84% of early money through SAFEs.

Carta tied note use to industries with heavy upfront capital needs and to less mature venture markets, "particularly the Midwest."

Here's our position. A note is often the stronger instrument for a short bridge from existing investors to a round that's already in motion.

The maturity date costs little when the next round is months away, and creditor status is often what gets insiders to wire. Y Combinator itself frames SAFE rounds as "independent seed rounds" rather than "shorter-term bridges to priced preferred stock rounds."

Hypothetical: A biotech company expects a Series A term sheet in four months. Its two existing funds offer $750,000 to cover the gap, on a note with a 12-month maturity. The deadline sits well past the expected close, and the funds get debt priority until then.

When Is a SAFE the Faster Close?

A SAFE is the faster close when the round is a standalone pre-seed or seed raise from angels, accelerators or early funds. Y Combinator says "a startup can issue a safe quickly and efficiently."

Speed comes from four things:

• One document: no separate purchase agreement in Y Combinator's form.
• Familiar terms: with 93% of pre-seed rounds on SAFEs, many early investors have signed one before.
• Nothing to extend: no maturity date, so no extension talks if the priced round slips.
• Clear dilution: each post-money SAFE's stake is the check divided by its cap.

Rolling closes are where SAFEs shine. Each investor signs when ready, and the founder can update a running dilution total after every check.

Hypothetical: An AI startup raises $1.2 million from eight angels, each signing a $150,000 post-money SAFE at a $12 million cap. Each angel holds 1.25%, the eight together hold 10%, and the founders know that number before any priced round.

For larger SAFEs, caps have been climbing. The median cap on SAFEs over $2.5 million was $35 million in Q2 2026, up 40% year over year, per Carta.

What Does Each Cost to Paper?

The documents themselves cost little. Y Combinator says the SAFE is "open sourced" for founders and investors. They can use it "as they see fit," under a Creative Commons license.

Self-serve platforms charge per document. Clerky lists SAFEs at $9 per use, convertible notes at $19 per use, or six months of issuances for $99, per its pricing page. That includes board consents, a financing checklist and a securities compliance primer.

Clerky says it offers "self-help services at your specific direction" and that it's neither an attorney nor a law firm. Our Clerky alternatives guide compares other options.

The federal filing is free. The SEC charges no fee for a Form D notice, which is due within 15 days after the first sale, per the SEC.

Counsel's time depends on the documents. A clean post-money SAFE with no side letter takes little review. A negotiated note, a cap-plus-discount term or a pro rata side letter takes more.

Hypothetical: A founder issues six standard SAFEs on Clerky at $9 each, or $54 in platform fees. A seventh investor asks for a note with a custom maturity clause, and that one document needs a lawyer's review.

@VirtualCounsel pricing: For plan names, prices and inclusions, see the pricing page. Hourly is the default for new relationships and open scope, billed on itemized invoices that show the work behind each charge. Flat fees cover clearly defined work, formation above all.

@VirtualCounsel also offers subscriptions, and only @VC Launch runs month to month. Higher tiers carry an annual commitment and are offered by invitation once the fit is clear.

What Working With @VirtualCounsel Looks Like

Our fundraising page lists SAFEs, convertible notes, term sheets, bridge and hybrid financings, and pre-seed through Series B rounds. Each client works with a dedicated attorney point of contact who learns the business.

What a client asks for and what it needs can differ, and our attorneys say so. A founder may ask for a SAFE when outstanding notes make another note the cleaner fit.

Clients reach their attorney through calls, email and Slack, per our general counsel page. @VirtualCounsel is a Carta Partner Law Firm.

A Decision Framework by Round Size and Investor Type

These are general patterns from our practice and the sources above. The right instrument depends on each company's facts.

Round size alone rarely decides it. Investor type usually matters more, since a fund that wants debt priority will price that into the terms either way.

Mixing instruments creates its own problems. Y Combinator's guide says issuing both "is generally not advisable," because notes rank ahead of SAFEs in a liquidation or dissolution.

When converting instruments pile up, cleanup gets harder at the priced round. See our guide to law firms for cap table cleanup and equity, or compare startup law firms for founders.

Start Here: A Five-Step Checklist

1. Write down the round: target amount, likely investors, and when a priced round could follow.
2. List every SAFE and note already outstanding, with its cap, discount and interest.
3. Run both instruments through the conversion steps above, using your own cap table.
4. Put the Form D deadline on the calendar: 15 days after the first investor is irrevocably committed, per the SEC.
5. Talk with counsel before signing anything nonstandard, such as a side letter or custom maturity terms.

SAFE vs Convertible Note FAQs

Is a SAFE better than a convertible note?

Neither wins in every round. SAFEs suit standalone pre-seed and seed raises. Notes often suit short bridges from existing investors and companies that already have notes outstanding.

Is a SAFE debt?

Y Combinator says it has always intended the SAFE to be an equity security. A SAFE carries no interest or maturity date. Tax treatment can differ, so founders typically confirm it with a tax advisor.

What happens if a convertible note reaches maturity before a priced round?

Principal and interest become due. Depending on the note's terms, maturity may trigger conversion, repayment or an extension.

What's the difference between a pre-money and a post-money SAFE?

A post-money SAFE measures its cap after all SAFEs, so each holder's stake is the check divided by the cap. Y Combinator moved to post-money SAFEs in 2018 to make founder dilution easier to calculate.

Can a startup issue both SAFEs and convertible notes?

It can, but Y Combinator calls it generally not advisable. Notes count as debt and rank ahead of SAFEs in a liquidation or dissolution.

What valuation cap is typical for a SAFE?

It depends on round size and sector. Carta reported a $35 million median cap on SAFEs over $2.5 million in Q2 2026, up 40% year over year.

Do founders need a lawyer to issue a SAFE?

Not always. Founders often use Y Combinator's standard form for small checks. They typically bring in counsel for side letters, custom terms or a mix of existing notes and SAFEs.

Choose the instrument your cap table can carry into the next round, and model it before anyone signs.

This article is for general informational purposes only and isn't legal advice. Reading it doesn't create an attorney-client relationship with VirtualCounsel, PC. Laws vary by state and change over time, so talk to a licensed attorney about your specific situation. Attorney advertising.