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bonds

What Is a Convertible Note—and How Does It Differ From a Convertible Bond?

A convertible note is commonly a startup loan that may convert into equity; a convertible bond is a debt security with conversion terms set by its instrument.

By TheFinanceBase Team 3 min read
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A convertible note is a loan that may convert into another security, often preferred stock when a startup completes a future financing round. A convertible bond is a debt security with a conversion feature. Both begin with debt-like terms and can lead to equity ownership, but their labels do not establish every legal or financial difference: the instrument’s terms and governing jurisdiction matter.

What is a convertible note?

In common U.S. startup-financing usage, a convertible note is an investor’s loan to a company that can convert into a different security. The SEC says startups often use these notes in seed rounds, with conversion typically tied to a future funding round or another condition set in the agreement. The investor holds a debt claim before conversion; the note is not already an equity stake.

The note’s contract sets whether conversion happens automatically, is optional, or depends on another agreed condition. It also governs interest, repayment, maturity, and what happens if the expected conversion event does not occur. There is no single outcome that applies to every note. See the SEC’s Common Startup Securities and its Investor Bulletin on SAFEs in crowdfunding.

What is a convertible bond?

A bond is a debt security—Investor.gov describes it as “like an IOU”—and a convertible bond adds a feature that allows the debt to convert into shares under specified terms. The bond may set coupon payments and a maturity date. Its conversion price or ratio, timing, and who can choose or require conversion depend on the instrument; the holder usually decides whether and when, but some terms give the issuer control in certain circumstances. Read Investor.gov’s Bonds – FAQs and Corporate Bonds.

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How do convertible notes and convertible bonds compare?

Feature Startup convertible note (common U.S. usage) Convertible bond (general bond framing)
Starting position A loan to a company; commonly used in seed financing, according to the SEC. A debt security.
Conversion Often tied to a future financing or another agreed event; the note specifies whether conversion is automatic or otherwise controlled. The bond terms set the conversion feature, including timing and whether the holder or issuer controls the election.
Cash and maturity terms The note specifies interest and repayment terms; details vary by agreement. The bond may specify coupon payments and maturity; details vary by bond.
Conversion formula The agreement may use a cap, discount, or other formula; the terms must be checked. The instrument sets its conversion price or ratio and related conditions.
If conversion does not happen Repayment, maturity, extensions, and default are governed by the note. Payment rights and claim priority depend on the bond’s terms.

These are common contexts, not universal legal categories. Do not assume that every document called a “note” or “bond” has the same mechanics; its wording and applicable law control.

Why the conversion formula matters

Conversion can change an investor’s position from a debt claim to an equity stake. Issuing shares can dilute existing shareholders. A fixed conversion formula and one tied to a changing market price can produce different outcomes. The SEC warns that with a market-price-based formula, a falling share price can result in more shares being issued, increasing potential dilution and affecting share value. Its Convertible Securities guidance explains these mechanics.

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What to check in a specific instrument

Before comparing or evaluating actual documents, identify the clauses that determine both the debt claim and the potential equity outcome:

  • Repayment and maturity: Is there a maturity date and a repayment obligation if conversion never occurs? Can the date be extended, and under what terms?
  • Interest or coupon: What rate or payment applies, and does accrued interest convert or get repaid?
  • Conversion trigger: Which financing or other event qualifies, and does conversion happen automatically or require an election?
  • Conversion price or ratio: Is it fixed or tied to a market price? Are a cap, discount, or other adjustment included?
  • Control and timing: Who can elect or require conversion, and when can that right be exercised?
  • Priority and default: What happens on nonpayment or default, and where does the claim rank against other creditors?

The SEC recommends understanding why a convertible security was issued and how its conversion formula works. The contract and jurisdiction determine the result; this overview is not individualized legal or investment advice.

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