The Borrower Defaulted on a Promissory Note — Now What? (Missouri)

So move deliberately. Confirm the default, follow the note's notice steps, accelerate the right way, and then decide how to enforce — by suing on the note, going after any guarantors, realizing on collateral, or some combination. And keep one eye on the calendar the whole time, because the statute of limitations is the trap that quietly kills more note claims than any borrower defense.

First, read the note before you do anything

Everything starts with the document in your hand. Pull the original note and read it closely, because its terms — not your assumptions — set the rules.

• Find the default definition. Most notes define exactly what counts as a default — usually a missed payment, but sometimes also insolvency, failure to maintain collateral, or other defined events. Confirm the borrower actually triggered one.
• Check for a required notice and cure period. Many notes require you to send a written notice of default and give the borrower a set number of days to cure (catch up) before you can take further steps. If the note demands it, you must do it.
• Read the acceleration clause. This is the powerful one: it lets you call the entire unpaid balance immediately due, not just the payment they missed. Acceleration is usually at your option and requires an affirmative step — often a written notice of intent to accelerate after the cure period passes.
• Note the default interest and attorney-fee provisions. Many notes bump the interest rate on default and let you recover your attorney's fees and costs. Those terms can substantially increase what you're owed.

Follow the note's own notice steps before you accelerate. A premature or skipped notice can make the acceleration defective and set your collection effort back to the start.

Gather your proof and confirm the default

A note case is won on documents, so assemble them before you make demands.

• Find the original note. Possession of the original instrument matters — a holder who lost it can sometimes still enforce, but only under the UCC's extra lost-instrument requirements. Don't write on it, and keep it safe.
• Pull every payment record. A complete ledger of what was paid, when, and what remains unpaid is your core evidence. It answers the most common borrower defense — "I already paid."
• Identify any guarantors and security. Check whether anyone signed a guaranty, and whether the note is secured by a deed of trust on real estate or a security interest in personal property. Both expand your options.
• Confirm the default is real and the clock is open. Verify the borrower actually breached as the note defines it, and that the statute of limitations hasn't run (more on that below).

Send notice, then accelerate the right way

With your proof in hand, follow the sequence the note lays out.

• Send a written notice of default and demand for payment. State the default, the amount past due, and what the borrower must do to cure, on the timeline the note requires.
• Let any cure period run. If the note gives the borrower days to catch up, you generally have to honor that window before going further.
• Send a notice of acceleration. Once the cure period passes without payment, exercise the acceleration clause in writing, declaring the full remaining balance immediately due along with accrued and default interest.
• Demand from the guarantors too. If others guaranteed the note, send demand under their guaranty. A solvent guarantor is often your most realistic source of recovery.

Doing this in order protects you. Skipping the notice-and-cure steps or accelerating before you're entitled to is exactly the kind of misstep a borrower's attorney looks for.

Choose your enforcement path

Once you've properly accelerated, you generally have more than one way to collect — and you can often pursue them together.

• Sue on the note. File a petition on the note in the appropriate Missouri court for the full accelerated balance, interest, and any contractual attorney's fees. Because the note is a written instrument fixing both the obligation and the amount, these suits are well suited to summary judgment — often the note plus an affidavit of the unpaid balance is enough.
• Pursue the guarantors. Sue any guarantors under their guaranty, frequently in the same action as the borrower.
• Realize on real estate collateral. If the note is secured by a deed of trust, you can foreclose under Chapter 443, selling the property to satisfy the debt.
• Realize on personal-property collateral. If the note is secured by an Article 9 security interest in personal property — equipment, inventory, vehicles — you can repossess and dispose of it by a commercially reasonable sale under RSMo § 400.9-610, often without going to court.

If the collateral doesn't cover what's owed, you may still pursue the borrower and guarantors for the remaining deficiency — though a botched foreclosure or a sale that isn't commercially reasonable can reduce or eliminate that claim.

Watch the statute of limitations — the real trap

This is where note holders get hurt, so treat it as a priority, not a footnote. The deadline to sue depends on what kind of note you hold.

• Negotiable note: six years. A negotiable promissory note is governed by UCC Article 3, and for a note payable at a definite time the limitations period is six years under RSMo § 400.3-118.
• Non-negotiable note or other written contract: ten years. A note that isn't a negotiable instrument falls under Missouri's general ten-year written-contract period in RSMo § 516.110.

Because the two periods differ, characterizing your note correctly is critical — assuming you have ten years when you actually have six can blow the deadline and bar the claim entirely. When the type is unclear, plan around the shorter period and don't let the date drift.

Frequently Asked Questions