How to Collect a Debt From a Business That Won't Pay: A US Creditor's Playbook
Most unpaid B2B invoices are stuck, not refused. The escalation ladder that works, what the 90 day mark really means, and how to choose between an agency, small claims court, and a write-off.
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To collect a debt from a business that won't pay, first confirm the invoice isn't stuck in approval or under dispute, then escalate past the accounts payable clerk to the AP manager and the person who signed the contract. Set one firm written deadline, send a formal demand letter, and at roughly 90 days decide: place it with an agency, file in small claims court, or write it off.
Most unpaid B2B invoices are not fraud. They're a purchase order mismatch, a missing approval, an invoice sent to an inbox nobody reads, or a customer with a cash problem quietly ranking suppliers and putting you near the bottom. Figure out which one you're dealing with before you write anything angry.
What can I do if a business won't pay my invoice?
Work an escalation ladder on a schedule instead of chasing when you remember. Confirm the invoice was received and approved, escalate the contact one level at a time, set a firm written deadline, then send a formal demand letter. If that fails, choose between a collection agency, small claims court, and writing the balance off. Each rung takes days, not weeks. In the order an experienced credit manager works it:
1. Confirm the invoice is actually in the system
Call, don't email. Ask three specific questions: did you receive invoice 1043, has it been approved, and what date is it scheduled for. A surprising share of "won't pay" accounts turn out to be "never got past intake," usually because the PO number was missing, the invoice went to someone who left, or the customer's portal rejected it silently.
2. Rule out a dispute nobody told you about
Ask directly whether there's any issue with the work or the amount. Customers often sit on a disputed invoice rather than raise it, because raising it means a conversation. Get any dispute in writing and split it out: never let a $400 argument hold up a $9,000 payment. Ask for the agreed portion now.
3. Escalate the contact, one level at a time
AP clerk, then AP manager or controller, then the person who signed the contract or issued the PO. That last person is the one who cares, because the invoice is attached to their project and their vendor relationship. Copying them isn't a threat, it's routing. Keep the tone factual: invoice number, date, amount, work delivered, what you've been told so far.
4. Set one firm written deadline
Not "please advise" or "following up." A specific date, amount, and consequence: "Payment of $8,443.88 is required by August 14. If we haven't received it or a signed payment plan by that date, the account moves to formal collection." Then honor the date. Missing your own deadline teaches the customer that nothing you write means anything. Our overdue invoice email templates cover the wording at each stage.
5. Send a formal demand letter
The last step before the decision point, covered in detail below.
6. Decide at roughly 90 days
Place it, sue it, or write it off. What costs you real money is doing none of the three and letting the file drift another quarter.
How long do I have to collect a debt from a business?
Practically, you have about 90 days before your odds fall off a cliff. Legally, the statute of limitations on a written contract varies by state, commonly somewhere in the three to six year range, with different periods for oral agreements and for sales of goods under the UCC. Check your own state, because the difference between states is large. This is information, not legal advice.
The legal clock decides whether you can still sue. The practical clock decides whether suing is worth it. Recovery rates fall sharply with the age of the receivable: invoices worked inside the first 90 days recover at high rates, while accounts past 180 days commonly recover below 15%. What changes isn't the debt. It's that your contact has moved on, the customer's cash position has degraded, and other creditors got in line ahead of you.
| Age of invoice | What's usually true | Right move |
|---|---|---|
| 1 to 30 days | Administrative. Approval, PO mismatch, wrong inbox. | Reminders on a schedule, confirm receipt by phone. |
| 31 to 60 days | Deprioritized rather than disputed. | Escalate contact, restate the total, invoke late fees. |
| 61 to 90 days | The customer has made a choice about you. | Firm written deadline, then a formal demand letter. |
| 90+ days | Recovery odds dropping every week. | Place, sue, or write off. Pick one. |
One caution: in many states a partial payment or a written acknowledgment can restart the limitations clock. That can work in your favor, and it's another reason to get any payment plan signed and dated rather than agreed on a call.
Can I take a business to small claims court for an unpaid invoice?
Yes, if the balance is inside your state's small claims limit and the debtor is within the court's reach. Limits vary widely by state, so check the ceiling in the county where you'd file. Filing fees are modest, you generally don't need an attorney, and many states let a business appear through an owner or officer.
Small claims is a good tool for the middle of the range: too big to write off, too small for a lawyer to touch economically. Bring the contract or signed proposal, the invoice, proof of delivery, and the full written chase history with dates. Judges decide these cases on documentation, and a dated timeline showing you asked five times and got three promises beats any argument about fairness.
Two practical limits. You'll need the debtor's correct legal entity name and registered agent, available from your state's business registry. And a judgment is not money: you may still have to garnish an account or place a lien, and a defendant with nothing to take is one you can't collect from. Check the company is active and solvent before you spend the filing fee.
Two industry-specific options are worth knowing. In construction, a mechanic's lien attaches to the property itself and often beats a lawsuit, but the notice and filing deadlines are short and unforgiving, so calendar them at the start of the job. And where an owner signed a personal guarantee, you can pursue that individual, though that can move you from commercial collection into consumer debt territory with a different set of rules.
Should I use a collection agency or collect the debt myself?
Collect it yourself while the invoice is young, and reserve the agency for accounts you've genuinely worked and can't move. Agencies charge contingency fees that typically run 25% to 50% of what they recover, climbing with the age and difficulty of the account. On a $10,000 invoice that's $2,500 to $5,000 of a debt you're already owed.
The other cost of placing an account is control. Once it's with an agency the communication is theirs, the tone is theirs, and the customer relationship usually ends there. That's an acceptable trade on a 240 day account. It's an expensive one on a 75 day invoice from a customer who'd have paid with two more calls. We break the pricing down in how much collection agencies charge.
The middle option is running the process in house with software instead of staff hours. That's what DebtAgent does: it works your overdue accounts on a schedule, escalates on your rules, and logs every message and response for the day you need a timeline. It runs on a flat monthly fee starting at $49 a month rather than a percentage of recoveries, so a $40,000 invoice costs the same to collect as a $400 one, and you stay the creditor of record. Our B2B debt collection overview covers the workflow.
One compliance point trips people up. A business collecting its own debts in its own name is generally a first-party creditor and outside the Fair Debt Collection Practices Act, which governs third-party collectors and covers debts incurred primarily for personal, family, or household purposes (15 USC 1692a(5)). Commercial debt owed by one business to another isn't consumer debt. The exception: collecting under a name that implies an outside agency can pull you into FDCPA coverage, so use your own name. The TCPA still applies to your calls and texts, and some states reach further than federal law. Information, not legal advice.
What is a demand letter and when should I send one?
A demand letter is formal written notice stating the amount owed, the basis for the debt, a firm payment deadline, and the specific action you'll take if that date passes. Send it after normal reminders have failed and before you place the account or file suit, typically between 60 and 90 days past due.
It works for two reasons. It moves the conversation from routine AR follow-up to a documented pre-litigation step, which often gets the file out of a clerk's queue and in front of someone with authority. And it becomes your central exhibit in court, showing you stated the amount clearly and gave a reasonable chance to pay.
What belongs in it: both legal entity names, the invoice numbers and dates, principal and any agreed late fees shown separately, a short summary of the agreement and what was delivered, a specific deadline (10 to 14 days is standard), payment instructions, and a plain statement of the next step. Keep the tone flat. Threats you won't carry out are worse than no letter. Our demand letter for payment guide has the full structure.
When to stop chasing
Writing an invoice off is a decision, not a failure. The chase costs staff time, filing fees, and attention that could go to customers who pay, and if you're tracking business spending closely you'll sometimes find that pursuing a small balance costs more than the balance itself. Write it off, document it for your accountant, put the customer on prepay or credit hold, and move on.
The accounts worth fighting for are the ones where the amount is material, the debtor is solvent, and your documentation is clean. Those three together are what make a lawsuit or a placement rational.
The best fix is upstream. Most businesses that struggle with unpaid B2B invoices aren't bad at collecting. They're slow to invoice, vague about terms, and inconsistent about follow-up, which teaches customers that the due date is a suggestion. Invoice the day the work is accepted, put terms and any late fee in the signed contract, and chase on a fixed schedule from day one.
This article is general information for US businesses, not legal advice. Statutes of limitations, small claims limits, lien deadlines, and state collection rules vary by state, and an attorney should review your process before you rely on it.
- More on small claims court for unpaid invoices: Small claims court is cheap, fast, and the last thing most unpaid invoices ever need. Verified state limits, what the filing actually costs, the paper trail that wins, and the part nobody warns you about: collecting after you win.
- More on late fee on invoice: The late fee clause most small businesses rely on is unenforceable, for one boring reason. What you can charge, what caps it, and why charging it consistently matters more than the rate.