Funding

Convertible Notes Explained

Everything founders need to know about convertible notes — interest rates, maturity dates, conversion mechanics, and negotiation strategies.

Nirji Ventures Editorial
Nirji Ventures Editorial
8 min readApril 2025

Convertible notes are one of the most widely used instruments in early-stage startup financing. As a form of short-term debt that converts into equity, they offer a middle ground between the simplicity of SAFEs and the structure of priced equity rounds.

What It Means

A convertible note is a loan that converts into equity upon a specified trigger event, typically a qualified financing round. Key terms include the principal amount, interest rate, maturity date, valuation cap, and discount rate. Until conversion, it sits on the balance sheet as debt.

Key Terms

Interest Rate: Typically 4-8% annually, compounding into the conversion amount. Maturity Date: Usually 18-24 months — if no conversion event occurs, the note becomes due. Valuation Cap: Maximum valuation at which the note converts, protecting early investors. Discount Rate: Typically 15-25%, allowing conversion at a discount to the next round price. Qualified Financing: The minimum amount that must be raised to trigger automatic conversion.

When It Is Used

Convertible notes are used in pre-seed and seed stages, particularly in jurisdictions where SAFEs lack legal precedent. They are also preferred by investors who want debt-like protections with equity upside, and in situations where a maturity date creates useful timeline pressure.

Decision Framework

Choose convertible notes when: investors require debt-like protections, your jurisdiction favours debt instruments, you want timeline pressure to force a priced round, or when the interest rate is reasonable. Be cautious of: high interest rates that increase conversion amounts, short maturity dates that create pressure, and complex conversion mechanics.

Nirji Strategic Perspective

Nirji Ventures has extensive experience structuring convertible notes across multiple jurisdictions. We help founders negotiate optimal terms — particularly around maturity date extensions, interest rate caps, and conversion mechanics — that balance investor protection with founder interests.

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Navigating this landscape requires expert guidance. Nirji Ventures offers fundraising advisory and startup consulting to help founders and executives make informed decisions.

Explore related insights:

Learn about startup valuation methods for complementary strategic context
Understand how investors evaluate startups to strengthen your approach
Read our guide on SAFE vs convertible notes for deeper analysis
Read our guide on SAFE note risks for deeper analysis

See how we've delivered results:

Contact our team to discuss how these insights apply to your specific situation.

Nirji Ventures Editorial

Written by

Nirji Ventures Editorial

Strategic Advisory

Nirji Ventures is a Singapore-based investment banking and strategic advisory firm with 35+ years of experience across 30+ countries. We specialise in M&A advisory, capital raising, startup consulting, and business transformation.

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Frequently Asked Questions

What is a convertible note?

A convertible note is a short-term loan that converts into equity upon a qualifying financing event, with terms including interest rate, maturity date, cap, and discount.

What interest rate is typical for convertible notes?

Typical interest rates range from 4-8% annually, with the accrued interest adding to the conversion amount.

What happens when a convertible note matures?

If no conversion event occurs by maturity, the note becomes due for repayment, though founders often negotiate extensions.

How do convertible notes differ from SAFEs?

Convertible notes are debt instruments with interest and maturity dates. SAFEs are equity agreements with neither, making them simpler but less protective for investors.

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