Updated August 10, 2026. Quick answer. A promissory note doesn’t need to be notarized or witnessed to be a valid, enforceable contract between a lender and a borrower — what makes it enforceable is that it names both parties, states the principal and interest rate, sets a maturity date or payment schedule, and is signed by the borrower. The document is what turns “family helped me out” into a debt a court can enforce and the IRS will respect as a loan rather than a gift.
What the note must contain
| Element | Why it matters |
|---|---|
| Principal amount | The exact sum lent — not “around $20,000.” |
| Interest rate | At or above the applicable federal rate for the loan’s term, or the IRS can impute interest and phantom income whether or not any was actually charged or paid. |
| Maturity date or payment schedule | A demand note and a term note are taxed differently — see how a fixed term versus an open-ended demand loan changes the AFR mechanics. |
| Parties’ names and signatures | The borrower’s signature is what makes the note enforceable; the lender’s isn’t legally required but is good practice. |
| Whether it’s secured | An unsecured note is just a contract. A note secured by real property needs a separate recorded security instrument — a mortgage or deed of trust, which state law generally does require to be notarized for recording, even though the note itself doesn’t. |
If you’re ready to put it in writing
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Does it need a witness or a notary?
Generally, no — a promissory note is a personal contract, not a deed or a will, and most states don’t impose witness or notarization requirements on the note itself for it to be enforceable between the parties. That changes the moment the loan is secured by real property: the mortgage or deed of trust that gives the lender a claim on the house is a different document from the note, and recording it with the county generally does require notarization. If your loan is secured by a house, see what an intra-family mortgage actually requires rather than treating the note alone as sufficient.
What a note doesn’t solve
A properly written note settles whether you have a loan or a gift — it does not by itself set the interest rate correctly (see where the minimum rate comes from), and it does not address what happens if you later decide to forgive some or all of it (see forgiving a family loan, which is a gift in the year you forgive it, not a neutral act). Decide the loan-vs-gift question honestly before you write anything down — see family loan vs. gift if you haven’t already.