My Client Hasn't Paid My Invoice — What Can I Do in California?

Invoice overdue and your client won't respond? California freelancers and small businesses have clear legal options. Here's what to do first.

You finished the work, delivered the project, and sent the invoice. Now it's 30, 60, maybe 90 days later — and your client has gone quiet. This is one of the most common and frustrating situations freelancers and small business owners face in California.

The short answer: You have real options, and they escalate. Start with a formal written demand, then consider small claims court or civil litigation if the client still refuses to pay. A lawyer-signed demand letter often resolves the situation before it ever reaches a courtroom — and understanding exactly what a demand letter does will help you use it effectively.

How Long Does a Client Have to Pay Before It Becomes a Legal Problem?

California law doesn't set a universal payment deadline for freelance or B2B invoices — the deadline is whatever your contract or invoice specifies. If your contract says "Net 30," payment was due 30 days after delivery. If there's no written agreement, California courts generally treat invoices as payable within a reasonable time.

Once that deadline passes, the client is in breach. You have up to four years to file a lawsuit on a written contract (California Code of Civil Procedure Section 337), or two years on an oral agreement (CCP Section 339). That said, don't wait — the sooner you act, the clearer your documentation and the stronger your position.

What You Should Do First: Document Everything

Before escalating, gather the following:

• A copy of your contract, agreement, or statement of work
• The original invoice with the amount and due date
• Proof of delivery or project completion (emails, signed receipts, file-delivery confirmations)
• Records of any payment promises the client made
• A log of every follow-up email or call and what happened

This documentation is what makes your claim credible — whether you're sending a demand letter or walking into a courtroom.

The Escalation Ladder: From Polite to Formal

Most unpaid invoices follow a predictable arc. Here's how to move through it:

Step 1 — Friendly follow-up. A short, professional email referencing the invoice number and due date. Sometimes invoices get lost in inboxes.

Step 2 — Firm written reminder. A more direct email or letter stating that the invoice is overdue and payment is expected within a specific timeframe — typically 7 to 14 days.

Step 3 — Attorney demand letter. A formal letter signed by a licensed California attorney that states the amount owed, cites your agreement, and warns of legal action if payment is not received by a stated deadline. This is the step that gets clients' attention.

Step 4 — Small claims or civil court. If the demand letter doesn't work, you can file in small claims court for amounts up to $12,500 (for individuals), or pursue a civil lawsuit for larger claims. You can read more about how small claims and demand letters compare to decide which path fits your situation.

Most unpaid invoice situations resolve at Step 3. Clients who have been ignoring emails for weeks tend to respond to attorney correspondence within days — because a lawsuit on record costs far more than simply paying the invoice.

Why an Attorney Letter Changes the Dynamic

A demand letter from a licensed California attorney carries legal weight that a strongly worded email simply doesn't. It signals that you are serious, that you have counsel, and that the next step is a court filing. For clients who are stalling but not outright refusing to pay, that signal alone is often enough to unlock payment.

The letter should reference your agreement, state the exact amount owed, set a clear payment deadline, and specify what legal action will follow if the deadline is missed. Getting the language right matters — a properly drafted attorney letter also creates a solid record if the dispute does go to court.

When a demand letter is the right tool: If a client owes you money, has received your work, and is unresponsive to follow-up, a lawyer-signed demand letter is usually the most cost-effective next step before court.

Keep Reading

• What Is a Demand Letter for Unpaid Invoices?
• Demand Letters for Freelancers: How to Collect
• Small Claims Court vs. Demand Letter — Which Is Faster?
• What Happens After You Send a Demand Letter?

---

Your first letter from Talk to My Lawyer is free — visit us at talk-to-my-lawyer.com.

This article is general information, not legal advice. For advice on your specific situation, consult a licensed attorney.