To get a client to pay an invoice, run a documented escalation: a polite reminder, then a phone call, then a certified demand letter with a firm deadline, and if none of that works, a collection agency or small claims court. Most late invoices are administrative failures that resolve at the reminder stage. The ones that don’t get resolved by the tools that follow, and each tool works better when you’ve built a paper trail from the first missed due date.
Start With a Reminder, Then a Phone Call
Send a polite follow-up email within a few days of the missed due date. Most late payments aren’t deliberate avoidance; an invoice got buried, an approver was out, or accounts payable needs a nudge. A short, friendly message often clears it up.
If email goes unanswered, pick up the phone. A call confirms the client received the invoice and opens a real-time conversation about what’s happening. Stay professional. Burning a bridge over a billing error you could fix in five minutes is a mistake you can’t undo, and clients who feel respected at this stage tend to pay faster than clients who feel cornered.
Send a Formal Demand Letter
When reminders produce nothing, the tone has to shift. A formal demand letter states the exact amount owed, references the original invoice and contract, sets a firm deadline for payment, and explains what happens if the balance isn’t resolved. Ten to fifteen days is a common response window.
Send it by certified mail with a return receipt. That receipt matters because it blocks the client’s most common defense in court: claiming they never knew about the debt. A demand letter also satisfies the pre-suit notice requirement that exists in a number of states for certain claim types.
The shift from friendly reminder to demand letter is the point. You’re signaling that informal resolution is off the table and that collection efforts, legal action, or both will follow. Plenty of clients who ignored three emails will find the money when a certified letter arrives with a specific deadline and stated consequences.
Offer a Payment Plan or Settlement if They Engage
Sometimes a client genuinely can’t pay the full balance at once. If they acknowledge the debt and want to resolve it, a written installment agreement beats continued silence. Specify each payment date and amount. Include an acceleration clause stating that if any single payment is missed, the entire remaining balance becomes due immediately. That clause prevents the pattern where a client makes two payments, then vanishes.
Adding interest to the installment plan compensates you for the time value of money you should have received on the original due date. A rate of 5% to 10% annually is common in commercial agreements and falls within the range most states permit. If you already specified a rate in the original contract, carry it forward.
A lump-sum settlement for less than the full invoice is another option. Taking a 15% or 20% loss can make sense when the alternative is months of collection effort or legal fees that eat into the balance anyway. Put the settlement in writing and include language stating that the reduced payment satisfies the entire debt. Without that written release, the client could later claim they overpaid, or you could face questions about whether additional amounts are still owed.
Hand It to a Collection Agency
If direct efforts fail, a third-party collection agency puts professional pressure on the client. Agencies work on contingency, meaning you pay nothing upfront and the agency keeps a percentage of whatever they recover. Commissions typically run from 15% to 50% of the collected amount, depending on the age of the debt, the dollar amount, and how many accounts you place. Older and smaller debts command higher percentages because they’re harder to collect.
Hand over your entire collection file when you engage an agency. The signed contract, invoice, demand letter, and communication log give them the evidence they need. Collection agencies also report delinquent accounts to credit bureaus, which creates additional incentive for the client to pay. That’s leverage you don’t have on your own as the original creditor.
One trade-off: once a collection agency is involved, the client relationship is almost certainly over. If there’s any chance you want to work with this client again, exhaust your direct options first.
File in Small Claims Court
Small claims court lets you pursue a legal judgment without hiring a lawyer, making it the most accessible legal remedy for unpaid invoices. Filing fees range from about $30 to $75 in most jurisdictions, though they can run higher depending on the claim amount. The maximum you can sue for varies significantly by state, from $2,500 on the low end to $25,000 on the high end, with most states between $5,000 and $10,000.
To file, submit a statement of claim at your local courthouse and pay the filing fee. You’ll need to serve the defendant with notice of the lawsuit, which usually means having the court clerk or a process server deliver the paperwork. At the hearing, bring your collection file: the contract, the invoice, the demand letter with its certified mail receipt, and the communication log. The judge reviews the evidence and decides whether the debt is valid and how much is owed.
If your unpaid invoice exceeds the small claims limit in your state, you have two choices: sue for the maximum allowed and forfeit the rest, or file in a higher court where you’ll likely need an attorney. For many small business owners, the simplicity and low cost of small claims court make it the better option even if it means writing off a portion of the debt.
Enforce the Judgment
Winning a judgment doesn’t automatically put money in your account. The court declares that the client owes you a specific amount; collecting it is your responsibility. If the client still won’t pay voluntarily, you can pursue wage garnishment or a bank account levy through the local sheriff’s office.
Federal law caps wage garnishment for most debts at 25% of the debtor’s disposable earnings per pay period, or the amount by which their weekly earnings exceed 30 times the federal minimum wage, whichever is less.1Office of the Law Revision Counsel. 15 USC 1673 – Restriction on Garnishment Some states set lower limits. A bank account levy, by contrast, allows you to seize funds sitting in the debtor’s account up to the judgment amount. Both options require additional court paperwork and typically involve fees for the sheriff or marshal who serves the order.2Consumer Financial Protection Bureau. Can a Debt Collector Take or Garnish My Wages or Benefits
Court judgments don’t last forever. Most states set an expiration window between 5 and 20 years, with renewal options available in many jurisdictions before the judgment lapses. Track the expiration date and renew if the debtor hasn’t paid in full.
Don’t Miss the Statute of Limitations
Every debt has a legal expiration date for filing a lawsuit. The statute of limitations for breach of contract claims runs from 3 to 10 years depending on your state, with most states in the 3-to-6-year range. Once that window closes, you lose the ability to sue for the debt, even if the client clearly owes the money.3Consumer Financial Protection Bureau. Can Debt Collectors Collect a Debt That’s Several Years Old
Two things can restart the clock in many states: the debtor making a partial payment, or the debtor acknowledging in writing that they owe the debt. That cuts both ways. A voluntary partial payment on a years-old invoice may revive your legal window, but a collector who tricks a debtor into a small payment specifically to restart the clock is engaging in a deceptive practice that courts take seriously.
The practical takeaway: don’t sit on unpaid invoices hoping the client will eventually come around. The longer you wait, the harder collection becomes and the closer you drift toward losing your legal options entirely.
Build a File That Makes Each Step Work
Every tool above works better with documentation, and works poorly without it. Pull together every record tied to the transaction. A signed contract or service agreement is the backbone of any collection effort because it proves the client agreed to pay a specific amount for specific work. Your invoice should display the invoice number, the date issued, and line items that match the scope of work in that contract. Discrepancies between the invoice and the original agreement are the first thing a judge or collection agency will notice, and they undermine an otherwise solid claim.
Save every email, text message, and voicemail tied to the project. A chronological log shows that the client knew about the debt and had opportunities to pay or dispute it. Keep everything in one folder, digital or physical. When you hand this file to a collection agency or present it in court, a clean, organized record makes your case dramatically stronger than a scattered pile of screenshots.
Two Contract Clauses That Change the Math Next Time
Two provisions in your original contract change the economics of collection. The first is an attorneys’ fees clause, which shifts the cost of a legal dispute to the losing side. Without one, the default rule in American courts is that each party pays its own legal fees, which means a $3,000 unpaid invoice might not be worth hiring a lawyer to recover. A mutual attorneys’ fees provision, where whichever side loses pays the other’s legal costs, encourages quick settlement because the client faces a bill that grows the longer they stall.
The second is a late-payment interest clause. State laws vary widely on what interest rate you can charge on overdue invoices when the contract is silent, with statutory rates ranging from roughly 5% to over 18% annually. If your contract specifies a reasonable rate, you have clear grounds to add interest to the balance. Without that clause, collecting interest on a past-due commercial invoice gets complicated and may not be possible at all.
What the FDCPA Does and Doesn’t Cover
Collecting your own unpaid invoices as the original creditor generally falls outside the federal Fair Debt Collection Practices Act. The FDCPA targets third-party debt collectors, not businesses collecting debts owed directly to them.4Office of the Law Revision Counsel. 15 USC 1692a – Definitions There’s a second carve-out: the FDCPA only covers debts incurred for personal, family, or household purposes, so purely commercial debts between two businesses fall outside its scope entirely.5Consumer Financial Protection Bureau. What Laws Limit What Debt Collectors Can Say or Do
Many states have their own unfair collection practice laws that apply more broadly, sometimes covering original creditors and commercial debts. And the moment you hire a collection agency, the FDCPA applies to them in full for any consumer debts they pursue.6Consumer Financial Protection Bureau. What Is an Unfair, Deceptive, or Abusive Practice by a Debt Collector Even when federal law doesn’t restrict you, stick to factual, documented communications, threaten only actions you actually intend to take, and never misrepresent the legal consequences of nonpayment.
If Collection Truly Fails, Look at the Tax Side
If you’ve exhausted your options and the invoice is genuinely uncollectible, you may be able to deduct the loss, but only if your business uses the accrual method of accounting. Accrual-method businesses record income when it’s earned, so the unpaid invoice was already included in gross income. When the debt becomes worthless, you can deduct it as a business bad debt.7Internal Revenue Service. Topic No. 453, Bad Debt Deduction
Cash-method businesses, which is how most sole proprietors and small companies operate, generally cannot take a bad debt deduction for unpaid invoices. Under cash accounting, you didn’t record the income until you received payment, and since you never received it, there’s nothing to deduct. The deduction must be taken in the tax year the debt becomes worthless, not when you first sent the invoice or when you gave up trying to collect. If you’re unsure about your accounting method or eligibility, that’s a conversation with your accountant.