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

Your client owes you money.
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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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First letter free · Full 3-letter kit $19 one-time · No account needed

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.

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.