Interest-producing investments
Promissory Notes
The underlying instrument of private lending: a written promise to repay a stated sum with interest, on stated terms.
A promissory note is a written, signed promise by a borrower to pay a lender a specific amount of money, with interest, according to a defined schedule. It is the core document behind almost every private loan — business loans, seller financing, hard-money deals and family loans alike — and it can be unsecured or backed by collateral through a separate security instrument. Notes can also be bought and sold at a discount, which is a market in its own right.
Interest from lending Semi-passive
The labels above place this income type before you read a word. The first is the mechanism — how the money actually reaches you, whether by lending it out, owning a slice of something, renting an asset, licensing a right, selling an option or owning a business somebody else runs. The second says whether the income keeps arriving on its own once it is running, or whether it needs work from you to keep coming. Both are descriptions of how the thing is built, not verdicts on it.
How it works
Every promissory note has two parties: the maker, who signs the promise to pay, and the payee or holder, who is entitled to receive payment. A note is negotiable — meaning it can be transferred like a financial instrument rather than just an ordinary contract right — if it satisfies the requirements of Article 3 of the Uniform Commercial Code, such as being an unconditional promise to pay a fixed sum.
The working parts of a note are principal, interest rate, payment frequency, amortization method, maturity date, late-fee and default provisions, and whether the borrower can prepay without penalty. These terms determine the payment shape: fully amortizing over the term, interest-only with a balloon payment at maturity, straight-line principal reduction, or payable on demand with no fixed maturity at all.
A note by itself is a promise, nothing more — it is unsecured unless paired with a separate instrument. Collateral requires its own paperwork: a security agreement and UCC filing for personal property, or a mortgage or deed of trust recorded against real estate.
Because a note is assignable, a holder can sell the right to future payments to a note buyer, usually at a discount to the outstanding balance, which gives the buyer a yield higher than the note's stated rate. Whether a note counts as a security under federal law is decided case by case using the family-resemblance test from the Supreme Court's Reves v. Ernst & Young decision — a point that matters because notes marketed to passive investors are often securities requiring registration or a valid exemption.
What it pays
A note pays whatever the face document specifies: the stated interest rate, plus any origination points, late fees, or default-rate interest the document authorizes. That rate is set by negotiation between maker and payee, driven by the borrower's alternatives, the strength and value of any collateral, the loan-to-value ratio, and the length of the term.
In the secondary market, a note bought at a discount to its outstanding balance pays the buyer a yield above the note's original coupon, since the buyer collects the full contractual payment stream on a smaller cash outlay. Seasoning affects that discount — a note with a long, clean record of on-time payments sells for closer to its face balance than a freshly written one with no payment history.
Buyers do not always take the whole note. Partial purchases — buying a defined number of future payments rather than the entire remaining stream — are common and change both the yield and the risk profile, since the buyer's claim ends once those payments are collected.
A default-rate clause raises the interest rate after a missed payment, but that higher rate is only worth as much as the borrower's remaining ability to pay. A defaulted borrower who cannot pay the original rate is unlikely to pay a punitive one.
Costs and taxes
Drafting and legal review are the first real costs, and they are worth incurring: a note missing a clear default definition, an acceleration clause, or a governing-law provision becomes far more expensive to enforce later than it would have been to write correctly. Where collateral is involved, add recording fees, UCC filing fees, and title work to confirm the lien attaches to the right asset.
Servicing — tracking payments, sending statements, monitoring escrow if any — can be handled by the lender directly or outsourced to a licensed loan servicer for a monthly fee, which also produces clean records and year-end tax documents.
Interest received is ordinary income for federal tax purposes, recognized in the year received or accrued depending on the lender's accounting method. Below-market or interest-free private loans, common between family members, are subject to imputed-interest rules tied to the applicable federal rate, which can create phantom taxable interest and, in some cases, gift-tax exposure even though no cash interest changed hands.
A note purchased at a discount generates market discount, which is generally treated as ordinary income as it accretes over the holding period or when the note is repaid — not as a capital gain, even though the purchase looked like buying a discounted asset.
Liquidity and time commitment
A promissory note is illiquid but not frozen. An active market of note buyers exists, and a well-documented, seasoned, properly secured note sells far more easily and at a smaller discount than a thin, unsecured, undocumented one. Selling always means accepting a price below the outstanding balance — that discount is the buyer's compensation for taking over the payment risk and the wait.
Short of a sale, the capital is committed until the payment schedule runs its course or the borrower prepays. There is no market quote to check and no way to redeem early on demand.
Effort front-loads into documentation: drafting the note, and where collateral is involved, perfecting the security interest and confirming the collateral's value and clean title. After that, ongoing effort is collecting payments, tracking the amortization schedule, issuing an annual interest statement, and confirming that insurance and property taxes on any collateral stay current.
How it goes wrong
Fraudulent promissory notes appear year after year on state securities regulators' lists of top investor threats. The pattern repeats: a high, fixed, 'guaranteed' return, a seller who is not registered to sell securities, and a borrower whose existence and finances cannot be independently verified.
An unsecured note against a borrower with no reachable assets is functionally a lawsuit waiting to happen rather than an investment — winning a court judgment and actually collecting money are two separate, often unrelated, problems. Documentation defects compound the risk: a missing acceleration clause, a vague default definition, a missing notarization, or a lien recorded against the wrong legal description all surface exactly when they matter most, at the point of enforcement.
Statutes of limitation run out the clock on old defaulted notes, with the exact trigger — date of default or date of last payment — varying by state. Selling notes to passive investors without registering them or fitting a valid exemption can constitute an unregistered securities offering under the Reves test, creating liability for the seller and an uncertain position for the buyer.
Below-market or undocumented loans among family members risk being recharacterized by tax authorities as gifts rather than loans, with tax consequences neither party planned for. And if the borrower files bankruptcy, an automatic stay halts collection, and a secured claim can be crammed down to the collateral's current value, leaving the unpaid remainder as a general unsecured claim behind other creditors.
What to remember
- A promissory note is a signed promise to repay principal with interest; it is unsecured unless paired with a separate lien or mortgage instrument.
- Yield comes either from the note's stated rate or, for a purchased note, from buying the payment stream at a discount to its balance.
- Interest is ordinary income, and below-market private loans can trigger imputed interest and gift-tax rules even without cash changing hands.
- Liquidity is low: notes can be sold to note buyers, but only at a discount, and defaults are enforced through the borrower's assets and the courts, not automatically.
- Documentation quality determines whether a note is enforceable; missing clauses or filing errors typically surface only at the point of default.
- Notes marketed to passive investors can be securities under the Reves test, meaning registration or an exemption is often legally required.
This page explains how the income type works, which does not change from week to week, so it deliberately carries no rate and no price. The links below go to the pages that hold the current figures for it, each one stamped with the date the data was pulled. Read the mechanism here first: the numbers there are far easier to judge once you know what they are measuring.
See the live numbers: Private Credit.
Frequently asked
Is a promissory note a security?
What is the difference between a secured and unsecured note?
Do I have to charge interest on a loan to a family member?
Can I sell a note I hold?
Written for information only. Nothing here is investment, tax or legal advice, and no page on this site recommends buying or selling anything. Rules and tax treatment change; verify anything that matters with a professional who knows your situation. This explainer was drafted by a language model (claude-sonnet-5) from an editor-approved outline and fact sheet, under the rules set out in our editorial policy, and carries no market figures. Last updated Jul 29, 2026.