What Happens When Your Convertible Note Hits Maturity

The Clock Most Founders Ignore

You signed a convertible note. You cashed the check. You got to work.

Then 18 months passed. No priced round. The maturity date is on the calendar and you are not sure what it means or what your investor can legally do about it.

This is not a rare situation. It is the normal situation for a large slice of founders who raised on convertible notes.

I talk to founders in this exact position constantly - the fear around maturity dates is misplaced. The bad news is that the founders who panic and make concessions are the ones who did not understand the mechanics before they got to this moment.

This article covers the full picture. What a convertible note maturity date is. What happens legally when it passes without a round. The three outcomes ranked by how often they happen. And the specific negotiating levers both sides use when the extension conversation comes up.

We will also show you why, in the current market, convertible note maturity is increasingly a legacy problem - but one that still affects thousands of startups who need to handle it correctly.

What Convertible Note Maturity Means

A convertible note is a loan. It is debt. That one fact drives everything else about how maturity works.

When you take on a convertible note, you agree to repay the principal plus any accrued interest by a specific date if the note has not converted to equity before then. That specific date is the maturity date.

The standard maturity window in US startup practice is 18 to 24 months from the date the note closes. Some notes run as long as 36 months, particularly in markets outside the US or for founders who negotiate hard at signing. The key is that the date is fixed and written into the note purchase agreement.

The entire premise of the convertible note structure is that the company will raise a priced equity round before the maturity date. When that happens, the note converts automatically into equity at the pre-agreed terms - usually a valuation cap, a discount rate, or both. The note disappears and the investor becomes a shareholder. That is the intended outcome and everyone goes home happy.

The problem comes when that priced round does not happen in time.

When the maturity date arrives and the note has not converted, the full principal plus all accrued interest becomes legally due and payable in cash. The full weight of that contractual obligation lands on the company.

For a pre-revenue startup that has been burning through its seed capital to fund operations, writing that check is almost always impossible. That is the tension at the heart of every maturity conversation.

The SAFE Has Won - But Convertible Notes Are Still Alive

Before we go deeper into the mechanics, it helps to understand where convertible notes stand in the market right now.

According to Carta data, convertible notes hit a record low of just 7% of pre-seed rounds and 8% of pre-seed dollars. SAFEs - Simple Agreements for Future Equity - now represent the overwhelming default for pre-priced startup fundraising.

One year earlier, Carta reported SAFEs at a record high of 90% of all pre-seed rounds, with convertible notes at 10%. Even biotech and pharma, which historically leaned toward convertible notes due to longer development timelines, have now shifted to SAFEs as their primary instrument.

SAFEs now represent 90% of pre-seed rounds. In the early days of the SAFE, I watched founders sign convertible note after convertible note because there was no alternative they trusted. Today, the note is a niche tool.

The reason is structural. The SAFE eliminates exactly the problem we are talking about in this article. A SAFE has no maturity date. No interest rate. No ticking clock. It sits on the cap table as an obligation that only converts when equity is raised. Founders do not lie awake at night worrying about a SAFE hitting its deadline because there is no deadline.

So why are we writing 5,000 words about convertible note maturity?

Because 7% of a large market is still a lot of startups. Because the notes that were signed 18 to 24 months ago are hitting their maturity dates right now, in a slower fundraising environment than existed when those notes were issued. And because the founders holding those notes often have no idea what their legal position actually is.

If you have a convertible note outstanding, this is the article for you.

The Three Outcomes at Maturity

When a convertible note reaches its maturity date without converting, one of three things happens. They are not equally likely. Here they are in order of frequency.

Outcome 1 - Extension (Most Common)

In nearly every case I have seen, when a note hits maturity without a round, the founder and investor agree to extend the maturity date. Typically this extension is for 6 to 12 months. Both parties sign an amendment to the note purchase agreement. Life goes on.

Why is this the most common outcome? Because it is in both parties interests.

The investor wants the startup to raise a round and convert the note at the favorable terms they negotiated - the valuation cap, the discount, the interest accrual. All of that upside disappears if the company goes bankrupt. Pushing a startup into bankruptcy to collect on a note is almost always self-defeating. The startup rarely has significant assets. Enforcement costs money out of pocket. And calling a note and bankrupting a startup will almost certainly damage the investor's reputation permanently in the startup community.

For founders, an extension buys more time to hit milestones and run a proper fundraise. It avoids a forced conversion at punitive terms or a public default that damages future investor relationships.

The extension is the win-win. It is executed the vast majority of the time.

But - and this is critical - the extension is not free.

The Price of an Extension

The moment a note hits maturity without a round, the investor has power. They know it. The founder should know it too.

Noteholders who agree to extend will often ask for a sweetener in exchange. The most common form this takes is a lower valuation cap. A note that started at a $10 million cap might be renegotiated down to an $8 million cap as the price of the extension. That lower cap means the investor converts into more equity when the round eventually happens. The founder pays more dilution.

Other common sweeteners include an increase in the discount rate - say, from 20% to 25% - or a bump in the interest rate. Some investors ask for all three. The founder who arrives at this conversation without knowing their legal position will almost always give more than they need to.

The founder who understands the dynamics - specifically, that the investor has very limited actual power - negotiates from a much stronger position.

Outcome 2 - Conversion at Renegotiated Terms (Less Common)

Some convertible notes are structured to automatically convert at the maturity date into shares of common stock or a new series of preferred stock at a pre-defined price. Others give the investor an option to elect conversion at maturity.

In practice, most startup lawyers advise against including automatic conversion provisions in the original note. The reason is that negotiating the preferred stock terms at note signing defeats the primary advantage of the convertible note structure - speed and simplicity. If the parties could agree on preferred stock terms upfront, they could have just done a priced round in the first place.

When conversion at maturity does happen, it is usually the result of a negotiated agreement between founder and investor at the time of maturity, not an automatic clause in the original note. The investor agrees to convert at a price that reflects the company's current position - often lower than the original cap would have implied.

This outcome happens in situations where the company has made progress but the fundraising market has not cooperated. The investor sees value in becoming a shareholder now rather than waiting. The founder avoids the extension negotiation and cleans up the cap table.

Outcome 3 - Repayment Demand (Rarest)

Technically, the investor has the right to demand repayment in cash when the note matures. Legally, this is a clean outcome for the investor - they get their principal back plus all accrued interest, and they walk away.

In practice, this almost never happens with startup convertible notes, for the reasons already described. The startup almost certainly cannot write that check. Pushing for repayment forces the company into bankruptcy. In bankruptcy, the investor typically gets nothing, because early-stage startups have no hard assets to seize.

Calling a note is a hand grenade that kills the investor's upside along with the startup. The investor who calls the note gets to tell the story that they destroyed a company to collect a check they will probably never actually receive. That story travels fast in the startup world. Future deal flow dries up.

Calling a note does occasionally make sense when a startup has reached genuine profitability and has cash on hand. But in that scenario, the investor almost certainly has more to gain by waiting for a conversion event or acquisition than by demanding repayment. The investor does not call the note.

Why Founders Have More Leverage Than They Think

I see this every week - founders showing up to the extension conversation believing the investor holds all the cards.

They do not.

Three factors give founders leverage at the maturity negotiation.

First, the company has very few assets the investor can actually seize. Enforcement of a debt obligation requires assets. I've watched pre-seed startups go through this with nothing to show on paper. Equipment, bank balance, and maybe some IP - none of it satisfies a significant judgment. The investor knows this. They know that calling the note and litigating is expensive, slow, and almost certain to produce nothing.

Second, the investor has reputational skin in the game. Startup investing is a small world. The story of an investor who called a note and killed a startup gets around. Other founders stop taking that investor's calls. Other VCs stop co-investing. The reputation damage from aggressive action at maturity is severe and long-lasting.

Third, extending the note preserves the investor's upside option. If they extend and the company eventually raises a round or gets acquired, the investor converts at their favorable terms and makes money. If they call the note, they get nothing and miss the upside entirely. The rational move for the investor is almost always to extend.

Founders who wait until the maturity date to have this conversation are giving away a negotiating advantage. The conversation should start at least 90 to 120 days before the date. Not the week of. Not the day before.

Early communication signals competence and good faith. It gives both parties time to work through the amendment without pressure. A founder who comes to the table with a plan - a credible timeline for the next round, a milestone they are targeting - is in a different position than one just asking for more time and hoping for the best.

The Accrued Interest Problem Founders Miss

There is a cost to convertible notes that compounds quietly while you are focused on building the company. I see this constantly - founders who never do the math until it is too late to do anything about it.

Convertible notes carry an interest rate, typically between 5% and 8% per year. According to Carta's Q1 data, the median interest rate on convertible notes was 7%.

That interest accrues throughout the life of the note. It does not get paid in cash. Instead, it converts to equity alongside the principal when the note converts in a priced round. This means the investor effectively receives a larger equity stake than the principal alone would produce.

Here is what this looks like in practice.

A $500,000 note at 7% annual interest that runs for 24 months accrues roughly $70,000 in interest over that period. When the note converts, the investor is not converting $500,000 into equity. They are converting $570,000. At a $5 million valuation cap, that difference represents meaningful additional dilution for the founder.

Now extend the note by 12 more months. That is another $35,000 in interest accrual on top of what was already there. By the time the note converts - if it converts after 36 months at 7% - the founder is looking at a $605,000 conversion from a $500,000 note. A 21% increase in the effective principal.

Extensions are sometimes the better option when the alternative is a forced conversion at punitive terms. But close that priced round as fast as humanly possible once the extension is granted.

The founders who understand this math push their investors harder to convert at the earliest reasonable opportunity. The founders who do not understand it keep extending and extending. Dilution compounds with every month that passes.

The Automatic Conversion Trap

Some founders, on the advice of well-meaning but inexperienced advisors, agree to automatic conversion provisions in their original convertible notes. The logic seems sensible. If the note converts automatically at maturity, there is no risk of the investor calling the loan or demanding repayment. Problem solved.

In practice, this is usually a mistake from the founder's perspective.

Automatic conversion at maturity requires the parties to agree, at note signing, on what the conversion price will be if no round has happened by maturity. That means negotiating a price - or a formula for arriving at a price - for the preferred stock that will be issued. And if you are going to negotiate a full set of preferred stock terms, you have destroyed the main advantage of the convertible note, which was supposed to be quick and simple.

Startup lawyers put it plainly. If the parties could agree on conversion terms at note signing, they might as well have just done a priced equity round from the start.

The second problem is economic. Investors who negotiate automatic conversion clauses tend to push for punitive conversion prices. They are getting a hard right at maturity, and they want that right to be valuable. This often means a much lower pre-money valuation than the founder expected - sometimes significantly lower than the original valuation cap on the note.

This creates a perverse incentive for the investor. If the automatic conversion price is low enough, the investor benefits from the company not raising a round before maturity. They get a higher percentage of the company by converting at the punitive maturity price than they would by converting at the round price under the cap.

The cleanest note for founders has no automatic conversion at maturity. Keep the maturity event as a negotiation, because that negotiation will almost always end in a reasonable extension.

What the Note Says vs. What Happens in Practice

Convertible notes spell out repayment terms clearly on paper, but what happens at maturity is another story. Understanding this difference is valuable for both founders and investors.

The note says the full principal plus accrued interest is due in cash at maturity.

What happens is the parties negotiate an extension, almost always.

The note may say a majority of noteholders must consent to any amendment, including a maturity extension.

What this means in practice is that if you raised your convertible note from multiple investors, you need a majority by dollar amount to agree to the extension. You cannot get one angel investor to block an extension that the other 90% of investors want to grant.

This majority provision is protective for founders. It prevents a single hostile noteholder from blocking a reasonable extension while everyone else is on board. If you are drafting a note now, make sure it includes this majority-rules amendment provision. If your existing note does not have it, you may need unanimous consent for an extension - which gives any single investor veto power over the process.

The note may also include a default interest rate that steps up if you miss the maturity date without a signed amendment. This penalty rate means the accrued interest compounds faster if you let the date pass without getting the extension signed. Get the amendment signed before the maturity date, not after.

Qualified Financing Thresholds and What They Mean at Maturity

I've read through hundreds of convertible notes, and nearly all of them include a qualified financing clause. This says the note only converts automatically if the company raises above a certain threshold - for example, $2 million or more in a single round. If the company raises below that threshold, the note does not automatically convert.

This clause matters enormously at maturity for one specific scenario. The company raises a small bridge round from new investors but the round falls below the qualified financing threshold. The convertible notes do not convert. The original noteholders remain creditors. And the maturity clock may now have already run.

Founders in this situation need to actively negotiate conversion or extension with the original noteholders. The small bridge round does not resolve the problem automatically. This is a common mistake.

When you are approaching maturity, check two things in your note. First, where is your qualified financing threshold? Second, does the note have any language about what happens if you raise a non-qualified round? The answers to those two questions will tell you whether your next bridge buys you cover or not.

A Worked Example of the Maturity Math

Walk through the numbers with a concrete scenario.

A founder raises $750,000 on a convertible note. The terms are 18-month maturity, 7% annual interest, $6 million valuation cap, and a 20% discount rate. The qualified financing threshold is $1.5 million.

Eighteen months pass. The founder has good traction but has not closed a round. The maturity date arrives.

Accrued interest: 7% per year on $750,000 for 1.5 years equals $78,750. The total amount that will convert is $828,750, not $750,000.

The investor comes to the extension conversation. They propose extending 12 months but lowering the valuation cap from $6 million to $5 million.

The founder runs the math. At the original $6 million cap, $828,750 converts to roughly 13.8% of the company. At the revised $5 million cap, it converts to roughly 16.6%. The extension costs the founder approximately 2.8 percentage points of the company - before accounting for the additional 12 months of interest that will accrue.

Add 12 more months of interest: another $52,500. Total at 30 months is $881,250. At the $5 million cap, that is closer to 17.6% of the company.

The founder who understands these numbers negotiates hard on the cap. They might agree to a $5.5 million cap and no discount rate change, rather than a $5 million cap and an interest rate bump. The founder who does not understand the math accepts the first offer.

How to Prepare for a Maturity Conversation as a Founder

If your maturity date is coming up and you do not have a priced round closing in the next 60 days, here is what to do.

Start the conversation early. Reach out to your lead investor 90 to 120 days before the maturity date. Do not wait until the date is a week away. Early outreach signals professionalism and gives everyone time to process the situation without pressure.

Come with a plan. When a founder says they need more time but cannot say what they will do with it, the conversation falls apart. The best conversation happens when the founder can say they are 60 days from closing an institutional seed round, have three conversations in process, and need a 6-month extension to give them the runway to close. That is a negotiable situation. Vague requests for more time are not.

Read the original note purchase agreement before the conversation. Find the maturity date provision. Find the default interest rate provision. Find the amendment process - is it majority consent or unanimous? Find the qualified financing threshold. These details determine your actual position.

Do not agree to the first offer. The investor's opening position in an extension negotiation is not their final position. They want to extend too. They need the company to succeed. The sweetener they ask for at the start of the conversation is the sweetener they want, not the sweetener they require.

Get the amendment signed before the date. Do not let the maturity date pass without a signed amendment in hand. Even a brief slip past the date may trigger default interest rate provisions and create technical default language in your cap table history.

How to Approach Maturity as a Note Investor

Investors who hold convertible notes in startups approaching maturity face their own set of decisions. I'll state this clearly even if it's familiar ground for experienced angels.

Calling the note is almost never the right move. The math does not work in your favor. The company has no assets. You will spend legal fees you will not recover. You will burn a bridge in a small community. And you will miss the entire upside you originally invested for.

The extension conversation is your opportunity to renegotiate terms that have become stale. If the company has grown significantly since you wrote the check, a lower cap may be justified. If the company has stalled, a cap reduction reflects the new reality and gives you more protection. This is legitimate negotiation.

Be realistic about what a punitive cap reduction does to the founder's incentives. If you squeeze the cap so low that the founder has little equity left after conversion, you have damaged the very thing you are trying to protect - the founder's motivation to keep building. An extension that breaks the founder's will to continue is worse than no extension at all.

The investors who build the best reputations in the startup community are the ones who treat maturity as a moment to demonstrate that they are real partners. They grant reasonable extensions without a lot of drama. They save the tough negotiation for situations where it is genuinely warranted.

Biotech and Medical Devices - Higher Risk at Maturity

This article applies primarily to software startups with 18 to 24 month notes. But there is a segment of the startup world where convertible note maturity risk is structurally higher: biotech, pharma, and medical devices.

According to Carta data, these are the industries where convertible notes are still most commonly used relative to SAFEs. Biotech and energy startups have the highest representation of convertible notes among all industries on the platform.

Timeline mismatch is the problem. A biotech startup working through clinical trials or regulatory approval may need 36 to 60 months before it can raise a meaningful priced institutional round. A standard 18 to 24 month convertible note is not well matched to that timeline.

Biotech founders who raise on convertible notes need to either negotiate longer maturity windows from the start - 36 months minimum, ideally with an automatic 12-month extension option built into the note - or they need to be prepared to manage one or two maturity conversations before the priced round happens.

The interest accrual problem is also more severe in biotech. At 7% annual interest, a note that runs for 36 months accrues roughly 21% in total interest on the principal. On a $1 million note, that is $210,000 in additional equity that converts at the same favorable terms as the principal. For a biotech founder who needs to preserve equity through multiple financing rounds, that accrual is meaningful.

SAFE vs. Convertible Note - The Maturity Question at the Core

If you are a founder who has not yet raised and is deciding between a SAFE and a convertible note, the maturity mechanics should be a significant factor in your decision.

SAFEs have no maturity date. No interest. No ticking clock. They convert when a priced round happens, on the terms agreed at signing, regardless of how long that takes.

Convertible notes have all of those things. They are debt with a deadline. They accrue interest that converts alongside principal. If you miss the deadline without a round, you face the three outcomes described above.

The market has voted on this question. Carta data shows convertible notes at just 7% of pre-seed rounds. The SAFE has effectively become the default structure for pre-priced startup fundraising in the US.

I talk to founders every week who are weighing this choice without a clear answer - and for those raising from angels and small funds, there is almost no reason to choose a convertible note over a SAFE today. The maturity risk alone tips the balance. Simpler terms. No ticking clock.

The situations where a convertible note still makes sense are narrow. Some institutional investors prefer them because the debt structure gives specific protections unavailable on a SAFE. Some international investors default to notes for legal or tax reasons in their home jurisdictions. And some founders believe the structure gives them cleaner terms in specific negotiating situations.

But if someone offers you a choice and does not explain why a note is better than a SAFE for your specific situation, default to the SAFE.

What to Include in a Convertible Note to Protect Yourself at Maturity

If you are negotiating a convertible note now - or reviewing one that has been presented to you - these are the provisions that matter most for maturity protection.

Maturity window length. Push for 24 months minimum. In my experience, 18 months leaves founders scrambling, particularly in a slower market. If the investor pushes back, 18 months with an automatic 6-month extension option at your election is a reasonable middle ground.

Majority consent amendment provision. Ensure the note can be amended - including maturity date extensions - with the consent of a majority of noteholders by dollar amount. This prevents a single holdout from blocking a reasonable extension.

No automatic conversion at maturity. For the reasons described earlier, avoid agreeing to automatic conversion clauses that set a punitive price or that require full preferred stock term negotiations at signing.

Interest rate. The current market median is 7% according to Carta. Do not accept significantly above that without a corresponding benefit elsewhere in the terms. Remember that every percentage point of interest accrues into additional equity that converts at your cap.

Default interest rate provisions. Some notes include a penalty rate that kicks in if the note is not repaid or extended by the maturity date. Know whether your note has this provision and what the penalty rate is. This is a reason to have the amendment signed before the date, not after.

Qualified financing threshold. Set this at a level that reflects your realistic next-round size. If you are likely to raise a $1.5 million seed, do not accept a $3 million qualified financing threshold. Set it too high and your note will not convert even when you raise a real round, leaving you with noteholders still outstanding as your company grows.

The Fundraising Environment Makes All of This More Urgent

Here is the context that makes the maturity mechanics especially relevant right now.

Convertible notes issued when founders could reasonably expect to close a priced round within 18 months are now hitting maturity in a market that has been more selective, more cautious, and slower to close.

Carta data shows pre-seed funding declined meaningfully in recent quarters. Larger pre-seed rounds above $1 million have shrunk in count. The founders who signed notes expecting a quick Series A are now having extension conversations instead.

This also means more founders are walking into extension negotiations without ever having run that conversation before. The tactics that work in that conversation are learnable. The founders who study the mechanics and show up prepared will get better outcomes than the ones who show up scared.

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What Every Maturity Conversation Actually Teaches You

Every founder who has been through a convertible note maturity negotiation reports the same thing afterward. It was less terrifying than they expected. The investor was rational. The extension got done. Life went on.

The fear comes from not knowing what the rules are. The moment you understand that the investor has almost no realistic leverage - that calling the note is self-defeating, that the extension is in everyone's interest, that you are negotiating a sweetener not a catastrophe - the conversation gets manageable.

The founders who get the worst outcomes at maturity are the ones who did not read the note, did not understand the mechanics, and panicked when the date arrived. They gave up cap reductions, discount increases, and interest bumps that more informed founders would have refused or traded more carefully.

Read your note. Know the date. Start the conversation early. Have a plan before you walk in. Understand that the investor needs this company to succeed just as much as you do - maybe more, given that they have no other way to recover their investment.

The maturity date is a deadline, not a death sentence. Treat it like one and you will handle it fine.