A promissory note can be invalid, or unenforceable, for several reasons: it may be missing an element the Uniform Commercial Code requires, no money or promised performance may have changed hands, the signature may have been obtained by fraud or duress, the signer may have lacked legal capacity, the terms may be illegal or usurious, the note may have been altered after signing, or the deadline for suing on it may have passed. Some of these defects wipe the note out entirely. Others make it “voidable,” meaning the person who was harmed gets to decide whether to honor it or walk away. And a few defenses that would work against the original lender stop working once the note is sold to someone else.
Missing UCC Elements
Under UCC Section 3-104, a promissory note must contain an unconditional promise to pay a fixed amount of money, payable on demand or at a definite time, and it cannot require the maker to do anything beyond paying money.1Legal Information Institute. Uniform Commercial Code 3-104 – Negotiable Instrument The word “unconditional” carries real weight. If payment depends on some outside event happening first, the note fails this test.
Beyond that, a valid note must identify the payee and carry the maker’s signature.2Legal Information Institute. Promissory Note It also needs to be payable “to order” or “to bearer” to qualify as a negotiable instrument.1Legal Information Institute. Uniform Commercial Code 3-104 – Negotiable Instrument
A note missing any of these elements is not automatically worthless. It loses the special protections Article 3 gives to negotiable instruments, but it may still be enforceable as a plain contract. What it cannot do is travel freely to third parties with full negotiable-instrument status.
No Money or Performance Ever Changed Hands
Every enforceable contract needs consideration, and a promissory note is no different. UCC Section 3-303 gives the maker a defense when the note was issued without consideration, meaning anything sufficient to support a simple contract.3Legal Information Institute. Uniform Commercial Code 3-303 – Value and Consideration If you signed a note promising to repay $50,000 but the lender never actually handed over the money, the note is unenforceable for lack of consideration.
The same defense applies when the note was issued for a promise of future performance and that performance never happened. You can raise a defense to the extent the promise was not kept.3Legal Information Institute. Uniform Commercial Code 3-303 – Value and Consideration One practical wrinkle: courts generally presume a signed note was supported by consideration, so the maker carries the burden of proving otherwise. When no funds ever transferred, that burden is not hard to meet.
Fraud, Duress, and Lack of Capacity
A note is only as good as the agreement behind it. If the signature was pulled out of the maker through deception, pressure, or from someone who could not legally agree in the first place, the note can be attacked.
Fraud in the Factum vs. Fraud About the Terms
The more serious kind of fraud, sometimes called fraud in the factum, happens when someone is tricked into signing without understanding what the document actually is. Being told you are signing a receipt or an application when it turns out to be a promissory note falls in this category. The UCC treats it as a “real defense” that can be raised against anyone who tries to enforce the note.4Legal Information Institute. Uniform Commercial Code 3-305 – Defenses and Claims in Recoupment
The lesser kind involves lies about the terms or the underlying deal, such as misrepresenting the interest rate or the repayment schedule when the maker knew they were signing a note. This works as a defense against the original lender, but it may not survive if the note is sold to a good-faith buyer.
Duress and Undue Influence
A note signed under duress is voidable. Duress means an improper threat that left no reasonable alternative but to sign. Section 3-305 lists duress alongside lack of legal capacity and illegality as defenses that can nullify the maker’s obligation when they are severe enough to void consent under applicable law.4Legal Information Institute. Uniform Commercial Code 3-305 – Defenses and Claims in Recoupment Undue influence is a related defense, arising when someone in a position of trust exploits that relationship to push the maker into signing. Proving either takes more than showing that the maker felt pressured.
Minors and Mental Incapacity
A person must have legal capacity to be bound by a promissory note. A note signed by someone under 18 is typically voidable at that person’s option, with narrow exceptions for loans covering necessities like food, shelter, or medical care. The UCC lists infancy as a defense to the enforcement of a negotiable instrument to the same extent it would be a defense to any simple contract.4Legal Information Institute. Uniform Commercial Code 3-305 – Defenses and Claims in Recoupment
Mental incapacity works the same way. If mental illness or cognitive impairment prevented the maker from understanding the nature and consequences of signing, the note is voidable. Being confused or making a bad decision is not enough; the incapacity must have been serious enough that the person genuinely could not comprehend the agreement.
Illegal Purpose or Usurious Interest
Courts will not enforce a promissory note tied to an illegal transaction. A loan made to finance illegal activity produces an unenforceable note no matter how carefully the document was drafted. The UCC lists illegality as a real defense that nullifies the maker’s obligation.4Legal Information Institute. Uniform Commercial Code 3-305 – Defenses and Claims in Recoupment
Usury is more common. Every state sets a ceiling on the interest that can be charged on certain loans, with maximum rates for personal loans ranging roughly from 5% to 45% depending on the state and lender type. A note with a rate above the applicable legal limit can be invalidated, and the fallout for the lender can be harsh: depending on the state, the lender may forfeit all interest, lose the right to collect the principal, or face statutory penalties.
One caveat matters. Federally chartered banks and certain other regulated lenders often operate under federal rules that preempt state usury caps, so a rate that looks usurious for a private loan may be legal when charged by a nationally chartered bank.
The Note Was Changed After Signing
Under UCC Section 3-407, an alteration is any unauthorized change to a party’s obligation, or an unauthorized filling in of an incomplete instrument. When the alteration was made fraudulently, the party whose obligation was changed is completely discharged from the note unless they consented to the change or are otherwise prevented from raising the defense. A lender who unilaterally raises the interest rate, changes the principal, or moves the due date on a signed note has effectively destroyed it.5Legal Information Institute. Uniform Commercial Code 3-407 – Alteration
Non-fraudulent alterations are treated differently. An unauthorized change made without fraudulent intent does not discharge the note; it can still be enforced on its original terms.
The Deadline to Sue Has Passed
A promissory note does not stay enforceable forever. UCC Section 3-118 sets default time limits for collection actions, and once those limits expire the note is practically unenforceable even if it was flawless when signed.
For a note payable at a definite time, the lender has six years from the due date to file suit. If the lender accelerates the debt after a default, the six-year clock runs from the accelerated due date. For a demand note where a demand has been made, the lender has six years from that demand. If no demand is ever made, the note becomes unenforceable after 10 consecutive years without any payment of principal or interest.6Legal Information Institute. Uniform Commercial Code 3-118 – Statute of Limitations
States can and do modify these default periods, particularly for notes secured by real property. Check your state’s version before relying on the UCC baseline.
What Changes When the Note Has Been Sold
Promissory notes are built to be transferable, and this is where many people get surprised. When a note ends up with a “holder in due course,” most of the defenses that would have worked against the original lender disappear. A holder in due course is someone who took the note for value, in good faith, and without notice that anything was wrong with it.7Legal Information Institute. Uniform Commercial Code 3-302 – Holder in Due Course
The UCC splits defenses into two categories. “Real defenses” work against everyone, including a holder in due course:
- Infancy, meaning the maker was a minor
- Duress, incapacity, or illegality severe enough to void the obligation under applicable law
- Fraud in the factum, where the maker was tricked into signing without knowing what the document was
- Discharge in insolvency, meaning the maker went through bankruptcy proceedings
“Personal defenses” include ordinary fraud about the loan terms, failure of consideration, and breach of the underlying agreement. These can be raised against the original lender but not against a holder in due course.4Legal Information Institute. Uniform Commercial Code 3-305 – Defenses and Claims in Recoupment The practical consequence is stark. If a lender deceived you about the terms of a loan and then sold the note to a bank that knew nothing about the deception, you may still owe the bank even though you could have defeated the original lender.
Below-Market Interest Is a Tax Problem, Not a Validity Problem
Charging too little interest will not invalidate a promissory note, but it can create tax exposure. Internal Revenue Code Section 7872 treats loans between related parties or in gift situations as having imputed interest when the stated rate falls below the applicable federal rate (AFR).8Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates The IRS updates AFRs monthly.9Internal Revenue Service. Applicable Federal Rates
When a loan charges less than the AFR, the IRS treats the shortfall as a transfer from lender to borrower (often a gift) and then as interest income flowing back to the lender. Both sides can end up with tax obligations they did not expect. A small exception applies to gift loans between individuals where the total outstanding balance stays at or below $10,000, as long as the loan is not used to buy income-producing assets.8Office of the Law Revision Counsel. 26 USC 7872 – Treatment of Loans With Below-Market Interest Rates Family loans are the most common trigger, and many people find out about the rule only after receiving an unexpected tax bill.