The invoice is 60 days overdue. You have called twice and emailed three times. The client either ghosts you or promises a check that never arrives. Before you give up or talk to a lawyer, write a demand letter. Done right, this one document gets most contractors paid within two weeks.
What a Demand Letter Actually Is
A demand letter is a formal written notice that you are owed money and intend to act if you are not paid by a specific date. It is not a lawsuit. It is the step you take before a lawsuit, and most disputes never go further than this letter.
It works because it changes the conversation. A voicemail is easy to ignore. A signed letter with a deadline and a reference to small claims court is not. It also becomes evidence later if you do need to file.
When to Send It
Send a demand letter once the invoice is 30 to 45 days past due and you have made at least two informal follow-up attempts. Sending it too early looks aggressive. Waiting past 90 days gives the client more time to claim they "forgot" or to disappear entirely.
Good triggers to send one now:
- The client has stopped responding to calls or texts
- The client keeps promising payment but never sends it
- The client is disputing the work for the first time, weeks after completion
- You have learned the client is doing the same thing to other contractors
What to Include in the Letter
A demand letter that holds up needs seven elements:
- Your full name, business name, address, and phone
- The client's full name and address
- The invoice number, original due date, and exact amount owed
- A short factual description of the work you performed
- A list of prior contact attempts with dates
- A firm payment deadline, usually 10 to 14 days from the letter date
- A clear statement of what you will do if you are not paid by that date
Skip the emotion. Do not call the client dishonest. Do not threaten anything you are not prepared to do. State the facts, the amount, and the deadline. That is what a judge would want to see later, and it is what makes the client take you seriously now.
Reference Small Claims Court Specifically
The final paragraph should name the specific remedy you intend to use. Small claims court is the right reference for most contractor invoices because filing limits cover the vast majority of disputes and you do not need an attorney.
Limits vary widely by state. A few examples:
- California: $12,500 for individuals, $6,250 for businesses
- Texas: $20,000
- Florida: $8,000
- New York: $10,000 in city courts
Look up your state's current limit before you write. Naming the actual court and limit in your letter shows the client you have done the research and are ready to file — the small claims filing process itself is straightforward once you have the paper trail in place. That detail alone moves invoices off desks.
How to Send the Letter
Send it by certified mail with return receipt requested. The receipt proves the client got it, which matters if you end up in court. Keep the tracking number and the green card in the same folder as your invoice and work records.
Send a copy by email the same day. The email creates a second timestamp and ensures the client cannot claim they never saw it. Use a subject line like "Formal Demand for Payment: Invoice INV-042."
Do not hand-deliver a demand letter. It puts you face to face with a client who is already not paying you, and it leaves no paper trail of when it was received.
What Happens After You Send It
Most clients respond within the deadline. Some pay in full. Some call to negotiate a partial payment or a payment plan. Either of those is a win compared to silence. Get any agreement in writing, even if it is a short email confirming the new terms.
If the deadline passes with no response, you have what you need to file in small claims court: the invoice, proof of completed work, your follow-up record, the certified letter, and the return receipt. Filing fees run roughly $30 to $100 depending on the state.
A note on lien rights: these vary significantly by state, project type, and contract status, with strict deadlines that often run from the date work was completed. If a lien might apply to your situation, talk to a licensed attorney in your state before relying on it.
Getting the Letter Written
The hardest part of a demand letter is the tone. Too soft and the client ignores it. Too hostile and you sound unhinged. Most contractors end up writing one version, second-guess it for a week, and never send it.
PaperHammer drafts three escalating versions (polite, firm, and final demand) from a short form about your job and your client. Each one is calibrated to your state's small claims limit and ready to send as a PDF in about five minutes. You stay in control: review the language, edit anything you want, then download and send.