How to Write a Promissory Note

A promissory note is a legally binding written instrument in which one party, known as the maker, promises to pay a specified sum of money to another party, known as the payee, under defined terms. Governed primarily by the Uniform Commercial Code Article 3 on negotiable instruments, promissory notes serve as formal evidence of a debt and establish the legal obligations of both the borrower and lender. Whether you are lending money to a family member, financing a business transaction, or structuring a real estate purchase, a properly drafted promissory note protects both parties and creates an enforceable record of the agreement.

When Do You Need a Promissory Note?

Promissory notes apply to a wide range of financial transactions, from informal personal loans to complex commercial financing arrangements. Understanding when a promissory note is appropriate helps ensure that every lending relationship starts on solid legal footing.

Personal Loans Between Family and Friends

Lending money to family members or close friends is one of the most common situations where a promissory note proves essential. Without a written agreement, disputes over repayment terms, interest, and timelines can damage personal relationships and leave the lender with no legal recourse. A promissory note formalizes the arrangement and sets clear expectations for both parties. Additionally, the IRS requires lenders to charge at least the Applicable Federal Rate on loans exceeding $10,000 under Internal Revenue Code Section 7872. Failing to do so may result in the IRS imputing interest income to the lender, creating unexpected tax consequences for what was intended as a simple favor.

Business Loans and Financing

In the commercial context, promissory notes are standard instruments for documenting loans between business partners, shareholder loans to corporations, vendor financing arrangements, and short-term bridge financing. They provide the legal foundation needed to record the debt on financial statements, establish priority among creditors, and enforce repayment if the borrower defaults. Businesses also use promissory notes to formalize deferred purchase prices in asset acquisitions or to structure earnout payments tied to future performance.

Real Estate Transactions

Real estate promissory notes accompany mortgages and deeds of trust, establishing the borrower's personal obligation to repay the loan while the mortgage or deed of trust secures the debt against the property. In seller-financed transactions, the promissory note becomes the primary document governing the financial terms between buyer and seller. These notes typically involve larger principal amounts, longer repayment periods, and more complex provisions for escrow, insurance, and property tax obligations than standard personal or business notes.

Student and Education Loans

Private education loans between family members or private lenders frequently use promissory notes to document the terms of repayment. Unlike federal student loans governed by specific statutory frameworks, private education loans depend entirely on the promissory note for their enforceability. Structuring these notes with clear deferment provisions, grace periods after graduation, and reasonable interest rates helps ensure the arrangement remains manageable for the borrower while protecting the lender's investment.

How to Write a Promissory Note: Step-by-Step

Drafting an enforceable promissory note requires attention to specific legal elements. Each component serves a distinct purpose and contributes to the document's validity under state and federal law.

Step 1: Identify the Maker and Payee

Begin by clearly identifying the parties to the agreement. The maker is the person or entity promising to pay, while the payee is the person or entity receiving payment. Include full legal names, mailing addresses, and, for business entities, the state of incorporation or organization. If multiple makers are involved, specify whether their obligation is joint and several, meaning each maker is individually responsible for the full amount, or joint only, meaning liability is shared proportionally.

Step 2: State the Principal Amount

Clearly state the principal amount of the loan in both numerical and written form to prevent ambiguity. For example, write the amount as "$25,000.00 (Twenty-Five Thousand Dollars)." Under UCC Article 3, a negotiable instrument must contain an unconditional promise to pay a fixed amount of money, so the principal should be stated as a definite sum rather than a variable or contingent figure. If the loan will be disbursed in installments rather than as a lump sum, describe the disbursement schedule and clarify that the total principal reflects the aggregate of all disbursements.

Step 3: Set the Interest Rate

The interest rate is one of the most legally sensitive provisions in any promissory note. Every state imposes usury limits that cap the maximum interest rate a lender can charge, and exceeding these limits can render the note unenforceable or expose the lender to penalties. Research the usury laws in your state before setting the rate. For consumer loans, the Truth in Lending Act and its implementing regulation, Regulation Z, may require specific disclosures including the annual percentage rate, the finance charge, the total of payments, and the payment schedule. Even when TILA does not technically apply to a private loan, following its disclosure framework adds clarity and strengthens enforceability.

For loans between related parties, the IRS publishes the Applicable Federal Rate monthly, establishing minimum interest rates for short-term loans of three years or less, mid-term loans of three to nine years, and long-term loans exceeding nine years. Charging interest below the AFR on loans over $10,000 triggers imputed interest rules under IRC Section 7872, meaning the IRS treats the forgone interest as a taxable gift from the lender to the borrower and as imputed interest income to the lender. Setting your rate at or above the AFR for the appropriate term avoids these complications.

Step 4: Define the Repayment Schedule

Specify exactly how and when the borrower will make payments. The most common repayment structures include equal monthly installments of principal and interest fully amortized over the loan term, interest-only payments with a balloon payment of the remaining principal at maturity, a single lump-sum payment of principal and accrued interest at maturity, and graduated payments that increase over time. For each structure, state the payment amount, the due date within each payment period, and the acceptable methods of payment such as check, bank transfer, or electronic payment. Include the mailing or account information where payments should be directed.

Step 5: Specify the Maturity Date

The maturity date is the deadline by which the full outstanding balance must be repaid. State this date explicitly rather than using vague language such as "when the borrower is able to pay." A promissory note payable on demand, meaning the payee can require payment at any time, should clearly state that it is a demand note. For term notes, choose a maturity date that aligns with the repayment schedule and provides the borrower with a realistic timeline for full repayment. If the note includes a balloon payment, ensure the maturity date and the balloon payment date are consistent.

Step 6: Include Default and Acceleration Clauses

Define what constitutes a default under the note. Common default triggers include failure to make a payment within a specified grace period, typically ten to fifteen days after the due date, breach of any covenant or representation in the note, bankruptcy or insolvency of the maker, and material adverse changes in the maker's financial condition. An acceleration clause allows the payee to declare the entire remaining balance immediately due and payable upon default, rather than waiting for each individual installment to come due. Without an acceleration clause, the lender may need to file separate claims for each missed payment, significantly complicating enforcement.

Include a late fee provision that specifies the penalty for overdue payments. Late fees are typically structured as a flat dollar amount or a percentage of the overdue payment, commonly between three and five percent. Some states regulate the maximum permissible late fee, so verify compliance with local law.

Step 7: Add Collateral Provisions (if Secured)

If the promissory note is secured by collateral, describe the collateral with sufficient specificity to create an enforceable security interest. For personal property such as vehicles, equipment, or inventory, the description should comply with the requirements of UCC Article 9 governing secured transactions. For real property, a separate mortgage or deed of trust will typically accompany the note, but the note itself should reference the security instrument. State that the payee has the right to pursue remedies against the collateral upon default, including foreclosure on real property or repossession and sale of personal property in accordance with applicable law.

Step 8: Include Signatures and Witnesses

The maker must sign the promissory note for it to be enforceable. While the payee's signature is not legally required for the note to be valid, having both parties sign demonstrates mutual acknowledgment of the terms. Include the date of execution next to each signature. Some states require or recommend notarization to strengthen the evidentiary weight of the document and simplify enforcement through summary judgment procedures. Witnesses are not typically required for promissory notes but can provide additional proof of execution if the maker later disputes signing the document.

Secured vs. Unsecured Promissory Notes

The distinction between secured and unsecured promissory notes fundamentally affects the lender's ability to recover funds if the borrower defaults.

A secured promissory note is backed by specific collateral that the lender can seize and sell if the borrower fails to repay. Common forms of collateral include real estate, vehicles, equipment, accounts receivable, and investment portfolios. The security interest must be properly perfected under UCC Article 9, typically by filing a financing statement with the appropriate state office, to establish the lender's priority over other creditors. Secured notes generally carry lower interest rates because the collateral reduces the lender's risk.

An unsecured promissory note relies solely on the borrower's promise to pay and the borrower's general creditworthiness. If the borrower defaults, the lender must file a lawsuit, obtain a judgment, and then pursue collection through wage garnishment, bank levies, or liens on property. Because unsecured notes carry greater risk for the lender, they typically command higher interest rates. Most personal loans between family members and friends are structured as unsecured notes.

Choosing between secured and unsecured structures depends on the loan amount, the borrower's credit profile, the parties' relationship, and the availability of suitable collateral. For larger loans, a secured structure provides meaningful protection and may be necessary to justify the risk.

Essential Clauses to Include

A comprehensive promissory note should address potential issues before they arise. Beyond the core elements discussed in the step-by-step section, consider including the following provisions:

Prepayment terms specifying whether the borrower may repay the loan early without penalty, with a penalty calculated as a percentage of the remaining balance, or subject to a lockout period during which prepayment is prohibited
A governing law clause identifying which state's laws will control the interpretation and enforcement of the note
A waiver of presentment, demand, and notice of dishonor, which streamlines the lender's ability to pursue collection without fulfilling technical UCC notice requirements
An attorney's fees provision requiring the defaulting party to pay the prevailing party's reasonable legal costs incurred in enforcing the note
A severability clause stating that if any provision of the note is found unenforceable, the remaining provisions continue in full force and effect
A choice of venue or forum selection clause designating the court or jurisdiction where disputes will be resolved
A notice provision specifying how formal communications between the parties must be delivered, such as by certified mail or overnight courier to designated addresses
An amendment clause requiring that any modifications to the note be made in writing and signed by both parties
A successor and assigns provision clarifying whether the note may be transferred or assigned to third parties and whether such transfer requires the other party's consent
A co-signer or guarantor section if a third party is guaranteeing the borrower's obligation, clearly establishing the guarantor's liability as primary and unconditional

Common Mistakes to Avoid

Many promissory notes fail to achieve their intended purpose due to preventable drafting errors. Avoid the following pitfalls:

Using vague repayment language such as "to be paid back when possible" instead of specifying concrete payment dates, amounts, and methods
Failing to research and comply with your state's usury limits, which can void the interest provision or the entire note in some jurisdictions
Omitting a default definition and acceleration clause, forcing the lender to pursue each missed payment individually rather than declaring the full balance due
Neglecting to address late fees, leaving the lender without a contractual remedy for chronic late payments short of declaring a full default
Setting an interest rate below the IRS Applicable Federal Rate on loans exceeding $10,000, triggering imputed interest and potential gift tax consequences
Failing to perfect a security interest by not filing the required UCC financing statement, which can subordinate the lender's claim to other creditors
Using oral agreements instead of written notes, which are difficult to prove in court and may be unenforceable under the statute of frauds for debts that cannot be performed within one year
Not retaining signed originals, as photocopies and electronic scans may face evidentiary challenges in some jurisdictions
Overlooking state-specific requirements for notarization, witness signatures, or mandatory disclosures that may affect enforceability
Failing to include a governing law provision, which can lead to disputes about which state's laws apply, particularly when the maker and payee reside in different states

Tax Implications and IRS Considerations

The tax treatment of promissory notes affects both the lender and borrower, and failing to account for IRS rules can create unexpected liabilities.

Interest income received by the lender is generally taxable as ordinary income and must be reported on the lender's federal tax return regardless of whether the borrower is a family member, friend, or business associate. The lender reports this income on Schedule B of Form 1040 if total interest income exceeds $1,500 during the tax year.

For loans between related parties, IRC Section 7872 imposes minimum interest requirements based on the Applicable Federal Rate published monthly by the IRS. If a lender charges interest below the AFR, the difference between the AFR and the actual rate charged is treated as imputed interest. The IRS treats this forgone interest as a transfer from the lender to the borrower, potentially subject to gift tax reporting requirements if the imputed amount exceeds the annual gift tax exclusion, which is $19,000 per recipient for the 2025 tax year. Simultaneously, the imputed interest is treated as income to the lender, creating a tax obligation on money never actually received.

There are limited exceptions to the imputed interest rules. Loans of $10,000 or less between individuals are generally exempt from Section 7872 provided the loan is not directly attributable to the purchase or carrying of income-producing assets. Loans between $10,000 and $100,000 benefit from a partial exception where imputed interest is limited to the borrower's net investment income for the year, and if that net investment income is $1,000 or less, no interest is imputed.

If a borrower defaults and the lender is unable to collect the outstanding balance, the lender may be able to claim a bad debt deduction. Nonbusiness bad debts are deductible as short-term capital losses on Schedule D, subject to the annual capital loss limitation of $3,000 against ordinary income. To claim the deduction, the lender must demonstrate that the debt was genuinely worthless and that reasonable efforts were made to collect the outstanding amount. Proper documentation through the promissory note and records of collection attempts is essential to substantiating this deduction.

The borrower's tax treatment depends on the purpose of the loan. Interest paid on loans used for business purposes is generally deductible as a business expense. Interest on loans secured by a primary or secondary residence may qualify for the mortgage interest deduction, subject to limitations on acquisition indebtedness. Interest on personal loans, such as those used for consumer purchases or family expenses, is generally not deductible by the borrower.

Both parties should retain copies of the executed promissory note, records of all payments made and received, and any correspondence related to the loan for at least three years after the note is fully satisfied to support their respective tax positions in the event of an IRS examination.