Prepaying a convertible note can reduce the shares issued when it would otherwise convert, but it uses cash and can shorten the company’s runway. Conversion usually preserves cash in the near term while diluting existing shareholders. The actual result depends on the signed note’s prepayment, interest, conversion, maturity, and transaction terms; sample agreements are illustrations, not standard terms.
What a convertible note prepayment changes
A convertible note is a debt obligation with a mechanism that can turn some or all of the balance into another security, commonly shares. Until conversion or repayment, principal and potentially interest remain obligations under the contract. A note may convert after a specified financing, at maturity, or following a defined transaction. As the U.S. Securities and Exchange Commission’s Investor.gov explains, a convertible security can be converted into a different security, typically common shares. Conversion formulas and control over when conversion occurs vary by instrument.
If the company is allowed to prepay, paying off some or all of the note can extinguish the balance that might otherwise convert, reducing the shares attributable to that note. The tradeoff is liquidity: payment is commonly principal plus accrued interest or another sum defined in the agreement, leaving less cash available for operations. Conversion avoids that immediate repayment outflow but issues equity. Neither path by itself captures all dilution: new financing shares, other notes or SAFEs, options, option-pool changes, and transaction terms can also affect ownership.
Which terms determine the outcome?
Prepayment rights and required consent
Start by checking whether the company has an optional prepayment right at all, and whether it needs approval from an individual holder, a majority, or another defined group. Also check for exceptions tied to maturity, default, a financing, or a change of control. SEC-filed sample documents illustrate different approaches: one bars prepayment before maturity without majority consent, while another sample term sheet requires written approval from the requisite noteholders for ordinary prepayment. These are examples, not universal rules. Filed note example; Sample term sheet.
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Amount payable and interest treatment
Calculate the amount due as of the actual payment date. Depending on the contract, that may include principal, accrued interest, default interest, premiums, fees, or a transaction-specific payment. Determine separately whether interest is paid in cash, converts along with principal, or receives different treatment at a particular event. If accrued interest converts, it increases the balance potentially represented by shares; if paid in cash, it adds to the near-term liquidity requirement.
One sample corporate-transaction clause requires accrued interest plus twice the principal for a holder electing cash rather than conversion. That illustrates why transaction language matters; it is not a typical or universal prepayment amount. See the sample term sheet.
Conversion trigger and price
For conversion scenarios, identify the qualified-financing threshold, discount, valuation cap, capitalization definition, and how alternative price calculations interact. In one SEC-filed example, principal and unpaid accrued interest convert at the lower of the discount price and valuation-cap price. For a given converting balance, a lower conversion price generally produces more shares. The cap alone is not enough to calculate ownership: the precise capitalization definition and other securities in the calculation matter. SEC-filed conversion example.
Maturity and company-sale provisions
Read what happens if the note reaches maturity without a qualifying financing: the agreement may provide repayment, an extension, optional conversion, or mandatory conversion. Separately, identify the defined change-of-control events and whether the holder can choose between conversion and cash, or receives another outcome. A sample term sheet gives a holder an election between conversion and a cash payment in a defined corporate transaction; the executed agreement and any amendments control the company’s actual alternatives.
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Compare the available scenarios before deciding
Model only alternatives the contract actually permits. A useful comparison typically includes prepayment now, remaining outstanding through a qualified financing, and reaching maturity or a transaction without an earlier conversion. Use the same operating forecast and capitalization assumptions across scenarios.
| Scenario | Cash and runway to calculate | Shares and ownership to calculate | Contract checks |
|---|---|---|---|
| Prepay now | Cash payment on the payment date, cash remaining afterward, and runway using current burn assumptions | Shares avoided from this note, plus dilution from other securities or financing | Prepayment right, required consent, payoff amount, interest, premium, fees, and any default exposure |
| Convert in a qualified financing | Cash preserved by not repaying the note, alongside cash raised and financing costs | Converting balance, conversion price, shares issued, and post-financing ownership | Financing threshold, discount, valuation cap, capitalization definition, and treatment of interest |
| Reach maturity or a defined transaction | Any repayment or transaction payment and resulting cash remaining | Shares under any maturity or transaction conversion election, alongside other transaction dilution | Maturity remedies, extension or conversion rights, change-of-control definition, holder election, and payment formula |
Do not present a generic dilution percentage or runway impact as though it applies to every company. Both depend on the signed terms, balance, cap table, cash balance, and burn forecast. If a note uses a market-price-based conversion discount, a falling share price can mean more shares are required, increasing dilution and potentially complicating later financing. The SEC describes this risk for some convertible securities; it should not be generalized to every capped startup note. SEC Investor.gov: convertible securities.
How to estimate dilution and runway
- Read the executed note and amendments. Extract principal, accrued-interest rules, payment rights, consent thresholds, conversion triggers and formulas, maturity remedies, and transaction provisions.
- Calculate each permitted payoff or conversion balance. Apply the contract’s interest and premium provisions through the relevant date; do not assume the same interest treatment applies at every event.
- Calculate conversion shares using the actual formula. Use the applicable discount or cap price, the contract’s capitalization definition, and the amount that converts. Include other convertibles and options where the definition requires them.
- Build a consistent post-event cap table. Show shares issued for the note separately from new-money shares, SAFEs, other notes, and option-pool changes so the note’s contribution is visible.
- Recalculate cash and runway under each case. Subtract contractually required payments from available cash, then apply the company’s current burn assumptions. Use the same forecast period and assumptions for each alternative.
The result is a company-specific comparison, not an answer that can be inferred from the note’s headline valuation cap alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Accounting is a separate question
A cash redemption should not automatically be described as a full expense, and early redemption does not have one universal balance-sheet treatment. For certain compound financial instruments, IAS 32 materials describe liability and equity components and treatment when an instrument is redeemed or repurchased early. HMRC’s Corporate Finance Manual gives an illustrative three-year £1 million convertible bond with 5% annual interest and a 7% market yield for a comparable non-convertible liability; under those assumptions, it calculates a £947,513 liability component and a £52,487 equity component. Those figures are an example, not a forecast or a rule for startup notes. The accounting for a particular note depends on its terms, jurisdiction, reporting framework, and applicable current standards. IAS 32 overview; HMRC Corporate Finance Manual, CFM21270.
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What to review before authorizing payment
- The signed note and every amendment, including who can approve prepayment.
- A payoff calculation dated to the proposed payment date, including accrued or default interest, premiums, and fees.
- A cap-table model showing conversion shares and post-event ownership under the contract’s capitalization definition.
- A cash forecast comparing payment with the company’s current burn and operating needs.
- Applicable legal and accounting advice for the governing jurisdiction and reporting framework.
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