Convertible Equity vs Convertible Debt
Two founders can raise the same amount from the same angel and walk away with very different obligations, simply because one signed convertible equity and the other signed convertible debt. On paper the two look alike: money now, shares later. In practice, interest and a maturity date change the conversation you will have with investors a year or two down the road. This explainer shows you exactly where the two part ways.
Key takeaways
- Convertible equity, such as a SAFE, has no interest and no maturity date. It simply waits to convert into shares.
- Convertible debt, usually called a convertible note, accrues interest and has a maturity date, which gives the investor a lender's leverage if no round happens.
- Both commonly use a valuation cap, a discount or both, so the conversion math can look very similar.
- The real difference shows up when things go slower than planned. Model that scenario before you sign.
If you are raising a small pre-seed round, an angel check or a bridge between priced rounds, you will almost certainly be offered one of these two instruments. Bridge rounds are often structured as SAFEs or convertible notes, and early angels frequently prefer them because they avoid negotiating a full valuation and a stack of priced round documents.
This guide is not a refresher on what a SAFE is. Instead it puts convertible equity and convertible debt side by side, walks through how each behaves in good and bad scenarios, and gives you a short framework for deciding which one to offer or accept. Quick note: this is general information about startup financing, not legal, tax or investment advice. Instrument terms and securities rules vary by country, so have a startup lawyer review anything before you sign.
The core difference in one sentence
Convertible equity is a promise of future shares with no loan attached, while convertible debt is a loan that is expected to turn into shares but remains a loan until it does.
That one distinction drives everything else. A loan carries interest, it has a date when it is due, and it sits on your balance sheet as a liability. A pure equity promise has none of those features. It does not grow over time, it never comes due, and in many cases it only converts when a qualifying financing or a sale happens.
What both instruments share
Before we look at the differences, it helps to see how much overlaps. Most convertible equity and convertible debt deals include some combination of these terms:
- Valuation cap. The maximum valuation at which the investment converts, which rewards early investors if your next round is priced much higher.
- Discount. A percentage off the price that new investors pay in the next round.
- Conversion trigger. Usually a priced equity round, sometimes with a minimum size, so a tiny raise does not force conversion.
- Change of control terms. What happens if the company is sold before conversion, such as a payout of the original amount or conversion at the cap.
- Pro rata or side letter rights. Optional extras that let the investor buy more in a later round.
So two deals can produce nearly identical share counts at conversion. The choice is still not cosmetic.
How convertible debt works
A convertible note is a short-term loan from an investor to your company. Instead of being repaid in cash, it is designed to convert into shares at your next priced round. Until then, it behaves like debt.
Interest accrues and usually converts too
The note carries an interest rate set in the agreement. In most startup notes, the interest is not paid in cash each month. It accrues, meaning it adds up quietly, and when the note converts, the accrued interest usually converts into shares along with the principal. The longer the note stays outstanding, the more shares the investor ends up with.
The maturity date is the pressure point
Every note has a maturity date, the day the loan is technically due. If you have not raised a priced round by then, the note does not disappear. Depending on the wording, the investor may be able to demand repayment, convert at a preset valuation, or agree to extend the date. Most early investors do not want to push a young company into default, so extensions are common. But the maturity date still gives the noteholder leverage, and they may ask for better terms in exchange for extending.
Common mistake
Setting a maturity date that assumes everything goes to plan. If your round slips by six months, you may be renegotiating with every noteholder at the worst possible moment. Ask your lawyer what happens at maturity under your draft, and choose a date with room for delays.
How convertible equity works
Convertible equity, with the SAFE as the best-known example, removes the loan features entirely. There is no interest and no maturity date. The investor pays now and receives the right to shares when a defined event happens.
For founders, this means:
- No clock. Nothing comes due, so a slow round does not trigger a repayment conversation.
- No growing balance. The amount that converts is the amount invested, so the investor's eventual stake does not creep up while you wait.
- Simpler balance sheet story. It is not a loan, which some founders find easier to explain to banks and future investors. Accounting treatment can still be technical, so ask your accountant how it should be recorded.
The trade-off is that investors carry more risk. If the company never raises a priced round and never sells, a convertible equity holder may wait a long time with no repayment right. Some investors accept that happily. Others prefer the protection of a note, especially for bridge financing in a later-stage company.
Side-by-side comparison
Here is how the two instruments compare on the points that matter most to a small founding team.
| Feature | Convertible equity (such as a SAFE) | Convertible debt (convertible note) |
|---|---|---|
| Legal nature | Right to future shares | Loan that is expected to convert |
| Interest | None | Accrues, usually converts into shares |
| Maturity date | None | Yes, repayment or renegotiation possible |
| Valuation cap and discount | Common | Common |
| Investor protection if no round | Lower | Higher, through creditor rights |
| Founder pressure over time | Low | Grows as maturity approaches |
| Typical use | Pre-seed and seed angels | Bridges, some angels, some regions where notes are customary |
How interest changes the conversion math
Take a simple, made-up case. An angel invests $100,000 with a valuation cap. Under convertible equity, $100,000 converts. Under a convertible note with interest accruing for two years, the amount that converts is $100,000 plus the accrued interest. With the same cap and discount, the noteholder receives more shares, and every other shareholder, including you, is diluted a little more.
Hypothetical example
Maya runs a two-person software startup. She raises $150,000 from three angels. Two sign convertible equity and one, who prefers a lender's protection, signs a $50,000 note with interest and an 18-month maturity. Her priced round slips from month 12 to month 20. The note passes maturity at month 18, so Maya needs the noteholder's agreement to extend. He agrees, but asks for a lower cap on his note. The two convertible equity holders do not need to agree to anything. Same money, same people, very different month 18. (All figures and names are made up for illustration.)
How to choose: a five-step framework
There is no universally right answer. The better choice depends on your timeline, your investors and local custom. Work through these steps with your co-founder before you send any documents.
- Estimate your path to a priced round. Write down when you realistically expect to raise again, then add a buffer. If the honest answer is "not sure," a maturity date becomes a bigger risk.
- Ask what your investors are used to. Some angels and some regions default to notes; others default to convertible equity. Matching custom can save weeks of back and forth.
- Model both versions. Use the template below to compare the shares each instrument would produce at your expected conversion date and at a delayed date.
- Read the maturity and default clauses closely. For a note, find out exactly what happens at maturity and whether a majority of noteholders can agree to extend on behalf of all.
- Keep terms consistent. Mixing many caps, discounts and instruments makes your cap table harder to read later. Aim for one standard set of terms per round where you can.
Pro tip
Keep a single "convertibles register" from day one: investor name, instrument, amount, date signed, cap, discount, interest rate, maturity date and any side letters. When your priced round arrives, your lawyer and lead investor will ask for exactly this list.
Convertible instrument comparison template
Copy this into a spreadsheet and add a row per instrument. All amounts below are made-up examples for illustration only.
| Investor | Instrument | Amount (example) | Interest | Maturity | Cap (example) | Discount | Amount converting at month 24 (example) |
|---|---|---|---|---|---|---|---|
| Angel A | Convertible equity | $50,000 | None | None | $4,000,000 | 20% | $50,000 |
| Angel B | Convertible note | $50,000 | Example: 6% simple | Month 18 | $4,000,000 | 20% | $56,000 |
| Angel C | Convertible equity | $25,000 | None | None | $5,000,000 | None | $25,000 |
Add one more column for "shares at conversion" once you have an expected round price, and run the sheet twice: once for an on-time round and once for a delayed one. The delayed scenario is where the instruments really diverge.
US, UK and EU notes
In the US, both convertible notes and SAFEs are widely used at the earliest stages, and many angels will accept either. Securities rules still apply to any raise, so your lawyer should confirm which exemption you rely on and what filings are needed.
In the UK and much of Europe, US-style SAFEs are less common, and local equivalents or convertible loan agreements are often used instead. Tax relief schemes for UK angel investors can also affect which structure works, because some instruments may not qualify. Check with a UK startup lawyer or accountant before offering a US template to UK investors.
Wherever you are, convertibles eventually turn into shares in your company, so the type of entity matters too. Most US venture investors expect a Delaware C-Corp. If you are an LLC today, raise that with your lawyer before taking convertible money.
Common mistake
Signing convertibles with no running total. Founders often forget how much of the company they have promised until the priced round, then discover they own less than expected. Model total dilution from all convertibles every time you sign a new one.
Negotiating terms without souring the relationship
A note's interest and maturity exist to protect investors if things go wrong, which is reasonable. You can still negotiate in a friendly, direct way:
- Ask for a longer maturity if your plan needs it, and explain why with your milestone timeline.
- Ask for automatic conversion at maturity at a preset valuation rather than repayment, if your lawyer thinks it fits.
- Ask for majority amendment rights so you can extend all notes with agreement from holders of a majority, not every single holder.
- Offer convertible equity first and switch to a note only if a specific investor needs it.
Whatever you agree, write it into the document. Handshake promises about extensions do not help much at month 18.
Your convertible instrument checklist
- Write down your realistic date for a priced round, plus a buffer
- Ask each investor which instrument they normally use
- Model shares at conversion for both an on-time and a delayed round
- For any note, read the interest, maturity and default clauses
- Agree on how extensions will be approved before you need one
- Keep caps and discounts consistent within each round
- Start a convertibles register and update it after every signature
- Have a startup lawyer review the final documents
Frequently asked questions
Is convertible equity always better for founders?
It is often simpler, because there is no interest and no maturity date. But some investors will only invest through a note, and in some countries notes or local convertible loans are the norm. Accepting a note on sensible terms can be better than losing a good investor.
Do I have to pay interest on a convertible note in cash?
Usually not. In most startup notes, interest accrues and converts into shares with the principal. Read your document, though, because terms vary and some agreements allow cash repayment at maturity.
What happens if my company is sold before conversion?
Both instruments normally include change of control terms, such as paying back the original amount or converting at the cap, whichever the agreement specifies. A note may also have its accrued interest included. Check the exact wording with your lawyer.
Can I mix both instruments in the same round?
Yes, and many founders do, but it adds complexity. If you mix them, keep the cap and discount consistent where possible and track everything in one register.
Related reading
The bottom line
Convertible equity and convertible debt often convert into similar stakes, but they behave very differently while you wait. Convertible equity has no interest and no deadline. A convertible note grows with interest and carries a maturity date that can bring investors back to the table if your round is late.
Before your next raise, ideally in these quieter late-summer weeks, map out a realistic timeline, model both instruments in the template, and agree on extension terms up front. A few hours of planning now can save you a tense renegotiation later.
