What Is a Promissory Note? A Guide for Note Holders

A promissory note is a written, legally binding promise by one party (the borrower) to repay a specific sum to another (the lender) on agreed terms. In real estate, it’s the document that is the debt — and the asset that note investors buy and sell.

The parts of a promissory note

Whatever the format, a real estate promissory note spells out:

• The parties — the maker (borrower) who promises to pay and the payee (lender) who is owed.
• Principal — the amount borrowed.
• Interest rate — fixed or adjustable, and how it’s calculated.
• Payment terms — amount, frequency, and due dates; whether it’s fully amortizing, interest-only, or has a balloon.
• Maturity date — when the loan must be paid in full.
• Default & remedies — late fees, default interest, and what happens if the borrower stops paying.
• Prepayment terms — whether early payoff is allowed and any penalty.

Secured vs. unsecured

An unsecured promissory note is backed only by the borrower’s promise. A secured note is tied to collateral through a separate security instrument — a mortgage, deed of trust, or land contract. Real estate notes are secured: if the borrower defaults, the holder can foreclose on the property. That collateral is exactly why note investors are willing to buy them.

Promissory note vs. mortgage

People use “note” and “mortgage” interchangeably, but they’re different documents. The note says how much is owed and on what terms. The mortgage (or deed of trust) says what happens to the property if the note isn’t paid. When a note is sold, the security instrument follows it by assignment — the legal transfer that makes the buyer the new holder.

Why the note is the asset that trades

Because the promissory note is negotiable, it can be bought, sold, or used as collateral. That’s the entire foundation of note investing: an investor buys the note (and the security instrument with it), usually at a discount, and collects the remaining payments. When you evaluate one to buy, the original note — with its endorsements (allonges) — is the first thing on the diligence checklist.