Unpaid Invoice Guide
The invoice is overdue and they're ignoring you. Send a real demand.
A mailed demand letter won't magically collect every debt — but a dated balance and deadline on paper is much harder to ignore than another email reminder, and it's the documentation small claims court wants to see.
Write it free below. If you'd rather not deal with the printer and post office, we mail it for you — first class for $10, or certified with delivery tracking for $19.
Best fit
- You completed the work or delivered the product.
- The invoice is overdue and reminders are being ignored.
- You can state the amount, invoice number, and deadline.
- You want one more documented demand before stronger action.
This is the letter you'll send
No guessing about wording. You fill in your details and the builder produces a clean, dated demand letter like this one — ready to download or have us mail.
Priya Anand Anand Design Studio 9 Market Street Portsmouth, NH 03801
May 29, 2026
Coastal Cafe LLC 120 Daniel Street Portsmouth, NH 03801
Dear Coastal Cafe LLC,
This letter is a formal demand for payment of $2,150.00 for branding and menu design services completed under Invoice #1043.
Payment was due on May 1, 2026. As of today, this balance remains unpaid.
Please remit payment in full by June 12, 2026. If payment has already been made, contact me immediately so this can be corrected.
If I do not hear from you by that date, I will consider additional next steps to collect the amount owed.
Sincerely,
Priya Anand Anand Design Studio
How it works
Fill in your details
Your business info, the customer's mailing address, the invoice amount, and your deadline. Takes a couple of minutes.
Download free, or let us mail it
Print and mail it yourself at no cost — or hand it off and skip the errand entirely.
We print, stamp, and send
First class for $10, or certified mail with tracking for $19 so you have proof it was delivered.
When this letter fits
The work is done. The invoice went out. You have followed up by phone, by text, maybe by email. The customer is either ignoring you, making vague promises, or disputing things that were never in question when you finished the job.
A written demand letter changes the dynamic. It signals that the back-and-forth is over and you are documenting the situation. For a lot of customers, a real letter — with a date, a balance, and a specific deadline — is the moment the invoice goes from something they can put off to something they need to deal with.
It also creates a paper trail that matters if you end up in small claims court. A judge will want to see that you made a clear, documented demand before filing. A mailed letter with a postmark is stronger evidence than a phone call you cannot prove happened.
This is not a legal document. It does not file any claims or create any obligation beyond what the original contract established. It is a firm, professional final notice that shows you are serious about collecting what you are owed.
What to put in the letter
- Your full name and business name
- The customer's full name and the address where work was performed
- Invoice number and the date it was issued
- The exact dollar amount owed — use the number from your invoice, not an approximation
- A plain-language description of the completed work and the date it was finished
- The original payment due date from the invoice
- A firm payment deadline — 10 to 14 days from the date of the letter is typical
- How you want to receive payment
- A brief, factual statement of what you will do next if the deadline is not met
Keep the tone firm and factual. State what happened, what is owed, and when you need it by. That is the whole letter. You do not need to explain the full project history or address every complaint the customer has raised.
What to leave out
Do not threaten anything you are not prepared to follow through on. If you write "attorney" and "collections" in the same sentence without having contacted either, the customer will notice. Threats that do not land make you look less serious, not more.
Do not turn the letter into a long argument about the quality of the work, the timeline, or what the customer said two months ago. If there is a legitimate dispute about scope, address it separately. The demand letter is about the outstanding balance.
Mistakes that weaken the demand
- Vague amounts. Write the exact figure. "Approximately $4,200" looks careless. "$4,215.00" does not.
- No real deadline. "As soon as possible" is not a deadline. Pick a specific date and write it in.
- Long backstory. Two or three sentences of context is enough. A demand letter is not a complaint letter.
- Waiting too long. If the invoice is 90 days overdue, the letter matters more now, not less. Send it.
What typically happens after the letter arrives
The customer pays. Some customers respond quickly when the demand is formal, dated, and clearly not going away. A physical letter sitting on a desk carries more weight than an invoice in an email inbox that has been scrolled past a dozen times.
The customer contacts you. A letter sometimes opens a real conversation that email could not start. They may want to negotiate the balance, dispute a specific line item, or work out a payment arrangement. That is still progress — and the letter is what got you there.
The customer ignores it. If this happens, the letter becomes your documentation. Small claims courts in New Hampshire, Massachusetts, and throughout New England all want to see that you made a clear, specific demand before filing a case. A mailed letter with a date, an amount, and a deadline is exactly what that looks like.
Choose how it gets mailed
Writing and downloading your letter is always free. You only pay if you want us to handle the printing and mailing.
Ready to write it?
Open the demand-for-payment template, add your invoice details, then download it free or have Forman3D print and mail it. First-class mailing is $10. Certified Mail is available as a $9 add-on during checkout.
General information only, not legal advice. If you need legal advice, talk to a qualified attorney.