How do I collect an unpaid invoice from a client?

Start with a friendly written reminder, follow up firmly in writing after 7–14 days, then send a formal demand letter by certified mail giving a clear deadline. If the client still doesn't pay, you can file in small claims court in your state. Written letters create the paper trail courts want to see.

What is a demand letter for an unpaid invoice?

A demand letter is a formal written request for payment that states the amount owed, the work performed, a payment deadline, and the actions you will take if payment isn't made — such as filing in small claims court. It is usually sent by certified mail so you have proof of delivery.

Does a demand letter actually work?

Very often, yes. Many clients pay after receiving a professional, formal demand letter because it shows you are organized, serious, and prepared to escalate. Courts also look favorably on plaintiffs who made a clear written demand before filing.

Can I take a client to small claims court for an unpaid invoice?

In most U.S. states you can sue for unpaid invoices in small claims court without a lawyer, as long as the amount is under your state's small claims limit (typically $5,000–$20,000). You'll want your invoice, contract or emails, and copies of the collection letters you sent.

For freelancers & small businesses

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Answer 8 quick questions and get a professional 3-letter escalation sequence — from friendly nudge to court-ready final demand — customized to your invoice and your state. Ready in 2 minutes.

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Letter 1 · Day 1The friendly reminder that keeps the relationship intact.

Letter 2 · Day 10The firm follow-up with a clear deadline and late-fee notice.

Letter 3 · Day 21The formal final demand, sent certified mail, citing small claims court.

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Letter 1 — The Friendly Reminder

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Letter 1 gets some clients to pay. Letters 2 and 3 are what get the rest to pay.

Letter 2: firm follow-up with deadline & late-fee language
Letter 3: formal final demand (court-ready, certified mail)
Certified-mail walkthrough — exactly what to say at the post office
Small claims guidance for your state, incl. dollar limit
Email subject lines + send-timing schedule
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Letter 2 — The Firm Follow-Up

Send ~10 days after Letter 1

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Letter 3 — The Final Demand

Send ~21 days after Letter 1, by certified mail

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Your Playbook — Certified Mail & Small Claims

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How to collect an unpaid invoice (the right way)

Roughly half of freelance invoices get paid late, and most late payers respond to one thing: a professional, escalating paper trail. Here is the sequence that works, and the one this tool builds for you:

The friendly reminder (Day 1). Assume good faith. Most late payments are disorganization, not malice. A short, warm note with the invoice attached resolves a surprising share of cases.
The firm follow-up (Day ~10). Now you set a specific deadline, reference any late-fee terms, and make clear you're tracking this. Tone shifts from "just checking in" to "this needs to be resolved."
The final demand (Day ~21). A formal demand letter sent by certified mail with return receipt. It states the amount, the deadline (usually 10 business days), and what happens next: small claims court. Judges want to see that you demanded payment in writing before filing — this letter is your evidence.

Do demand letters actually work?

Often, yes. A formal demand letter signals that you are organized, that you have documentation, and that ignoring you now has a cost. Many clients pay at this stage because defending a small claims case costs them more than the invoice.

What if they still don't pay?

Small claims court exists exactly for this. In most states you don't need a lawyer, filing fees are typically $30–$100, and limits range from about $5,000 to $20,000 depending on the state. Your kit includes your state's limit and what to bring.

Select your state in the generator above to see your small claims court limit.

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Get Paid Letters provides self-help document templates and general information, not legal advice, and is not a law firm or a substitute for an attorney. Statutes and small claims limits change and vary by circumstance — always double-check your state’s current rules with your local court before relying on them.

Your client owes you money.Send the letters that get it back.