You finished the job. The customer signed off. The invoice went out. And now it is sitting in the 30-day bucket with no reply.
Every contractor knows this moment. Payroll is due Friday, the supplier wants their money, and a customer who was all smiles at the walkthrough has gone quiet. The temptation is to fire off an angry email or, worse, to wait and hope.
A clear past due invoice letter fixes most of these situations. Not because it is clever, but because it removes every excuse: the customer knows exactly what is owed, for which job, by when, and how to pay. This guide gives you four letters you can copy today, a filled-in example, versions for restoration, roofing and specialty trades, and the follow-up schedule that makes them work.
KEY TAKEAWAYS
- Every letter needs the invoice number, job address, amount, due date, a payment link and a real contact.
- Use four letters that get firmer over time: friendly, firm, final, and a carrier version for insurance jobs.
- Never send a payment link to an adjuster. Ask for status and documentation instead.
- Send each letter by email first, then follow with a text and a call. People ignore one channel, not all of them.
- The schedule matters more than the wording. Most invoices go unpaid because the second and third reminders never get sent.
What is a past due invoice letter?
A past due invoice letter is a written notice telling a customer that an invoice has passed its due date and is still unpaid. It restates what is owed, refers to the original invoice, and asks the customer to pay or get in touch by a specific date.
For contractors, it does three jobs at once:
- It gets you paid. Many late invoices are simply forgotten. A clear reminder with a payment link often clears them within days.
- It surfaces problems early. If the customer is unhappy with the work or confused by the invoice, a letter gives them a reason to say so while it is still easy to fix.
- It creates a record. If you ever need to file a lien, send the account to collections or go to small claims, a dated trail of polite, specific letters shows you acted in good faith.
What every past due invoice letter needs
| Element | Why it matters |
|---|---|
| Invoice number and job address | Contractors bill many jobs to the same customer. Make this one impossible to confuse. |
| Amount due and original due date | State both plainly so there is nothing to look up. |
| A payment link | "Call our office" adds days. One click removes them. |
| A specific date | "Please pay by Friday, March 14" beats "at your earliest convenience". |
| A real person to contact | Name, phone and email. Disputes get solved faster when someone answers. |
| The original invoice attached | Saves the customer searching their inbox, and removes "I never got it". |
Template 1: Friendly first notice
Use this in the first week after the due date. Assume good intent. Most customers at this stage simply forgot or are waiting on a payday.
1 TO 7 DAYS LATE
Subject: Invoice [#] for [job address] is past due
Hi [First name],
A quick reminder that invoice [#] for the work at [job address] was due on [due date]. The balance is [amount].
You can pay online here: [payment link]. If you have already sent payment, thank you, and please ignore this note.
If anything on the invoice needs a second look, reply to this email or call me at [phone].
Thanks,
[Your name]
[Company]
Template 2: Firm second notice
Use this around two to four weeks late. The tone is still polite, but it names how late the invoice is, sets a date and offers a payment plan so the customer has no reason to stay silent.
15 TO 30 DAYS LATE
Subject: Second notice: invoice [#] is [X] days past due
Hi [First name],
We have not yet received payment for invoice [#] ([job address]), which was due on [due date]. The balance of [amount] is now [X] days past due.
Please pay by [date] using this link: [payment link]. If you need to set up a payment plan, reply and we will work it out.
If there is a problem with the work or the invoice, let me know today so we can fix it.
Thanks,
[Your name]
Template 3: Final notice
Use this when several reminders have gone unanswered. It is the last letter before you take another step, so be specific about that step and the date.
45+ DAYS LATE
Subject: Final notice before further action: invoice [#]
Hi [First name],
This is our final notice for invoice [#] for [job address]. The balance of [amount] was due on [due date] and remains unpaid after several reminders.
Please pay in full by [date] at [payment link], or contact me to agree a payment plan. If we do not hear from you by then, we will move to the next step in our collections process, which may include [lien filing / referral to a collections agency / small claims].
We would much rather settle this directly. Call me at [phone].
[Your name]
Tip: Only list consequences you will actually follow through on, and check your state's lien deadlines before you mention one. Lien rights in many states expire within months of the last day of work, and some states require a preliminary notice early in the job.
Template 4: Insurance carrier or adjuster follow-up
On insurance work, the adjuster usually controls the timing of payment, but they are not the one paying. Treat this as a status request, not a demand.
INSURANCE JOBS
Subject: Payment status for claim [claim #], insured [name]
Hi [Adjuster name],
I am following up on our invoice [#] for claim [claim #] at [property address]. The approved amount of [amount] was submitted on [date] and we have not yet received payment.
Can you confirm the payment status, or let me know what documentation you still need from us? I have attached the invoice, the signed work authorization and the completion photos.
Thanks,
[Your name]
Tip: Do not send a payment link to an adjuster or carrier. Ask for status and documentation needs instead. Send the payment link to the homeowner for their deductible.
A filled-in example
Here is how the firm second notice looks once it is filled in for a real job. Notice how little the customer has to think about.
From: Maria Lopez, Office Manager, Ridgeline Exteriors
To: David Chen
Subject: Second notice: invoice 2318 is 21 days past due
Hi David,
We have not yet received payment for invoice 2318 for the gutter and fascia replacement at 412 Oak Hollow Drive, which was due on October 10. The balance of $3,480.00 is now 21 days past due.
Please pay by Friday, November 7 using this link: [Pay invoice 2318]. You can pay by card or bank transfer. If you would like to split it into two payments, just reply and we will set that up.
If anything about the job or the invoice is not right, let me know today and I will get it sorted.
Thanks,
Maria Lopez
Ridgeline Exteriors · (555) 014-2290
Example company, customer and amounts are made up for illustration.
Bring one overdue invoice.
We'll show you exactly how it would be chased, and what your customer would see.
How to adapt the letters for your trade
Restoration and water mitigation
Restoration invoices often have several payers. Send the carrier letter (Template 4) to the adjuster with the drying logs, moisture readings and photos attached. Send Templates 1 to 3 to the homeowner for the deductible and any non-covered work, and mention the claim number so they can connect it to their insurance paperwork. If a check is made out to both the homeowner and their mortgage company, add a line asking the homeowner to start the endorsement process. For more on billing insurance work, see our guide to restoration insurance billing.
Roofing
Roofing payments tend to arrive in pieces: the first insurance check, supplements, the depreciation release and the deductible. Name the specific piece you are chasing in the subject line, for example "Deductible for invoice 2318" or "Depreciation release, claim 0042-118". That stops the homeowner thinking they have already paid.
HVAC, plumbing and electrical
For residential service work, keep letters short and lead with the payment link, because most of these customers will pay from their phone. For commercial and property management accounts, send the letter to the AP contact by name, include the PO or work order number, and copy the person who approved the work.
Subcontractors billing a general contractor
GCs usually pay on a schedule tied to pay applications and lien waivers. Before you send a past due letter, confirm you submitted everything the GC needs: the pay app, conditional lien waiver, certificate of insurance and any required backup. Then reference those documents in the letter so the AP team cannot send it back.
How to send past due letters
| Channel | Best for | Watch out for |
|---|---|---|
| Every letter, with the invoice attached and a payment link | Spam folders and old addresses. Send from a real person, not no-reply. | |
| Text message | Homeowners and small business owners | Keep it short, identify your company, and honor STOP requests. |
| Phone call or voicemail | Larger balances and anything that might be a dispute | Log what was said and any promised date. |
| Certified mail | Final notices and any notice your state's lien law requires in writing | Slow. Use it alongside email, not instead of it. |
The schedule matters more than the wording
Most contractors do not lose money because their letters are weak. They lose it because the second and third reminders never get sent. Someone gets busy, the invoice slips into the 60 and 90-day buckets, and by then the customer has stopped answering.
| Day 1 | Template 1 by email with a payment link |
| Day 4 | Text message with the same link |
| Day 8 | Phone call or voicemail |
| Day 15 | Template 2 by email and text |
| Day 30 | Call from the owner or office manager |
| Day 45 | Template 3 by email and certified mail |
Stop the sequence the moment the customer pays or promises a date, and pick it back up if the promise is missed. On insurance jobs, run Template 4 weekly with the adjuster in parallel with the homeowner schedule.
Six mistakes that make past due letters fail
| 1 | No payment link. Every extra step between reading and paying is a reason to put it off. |
| 2 | Vague dates. "Soon" and "at your earliest convenience" give the customer permission to wait. |
| 3 | Jumping to threats. Leading with collections or liens on the first notice damages a relationship that could have brought repeat work and referrals. |
| 4 | Sending to the wrong person. On commercial jobs, the person who hired you is rarely the person who pays you. |
| 5 | One letter and done. A single reminder rarely works on its own. The sequence does the work. |
| 6 | No record. If you cannot show when each letter went out and what the customer said, escalating later gets harder. |
Let the letters send themselves
AR Workflow shows the invoices nobody is following up on, and puts them on a schedule in one click.
AR Workflow connects to QuickBooks Online, puts each open invoice on a follow-up schedule like the one above, and sends the emails, texts and voicemails from a dedicated number with a payment link. It stops when the customer pays, pauses on a promise to pay, and logs every touch against the invoice. For insurance jobs, it treats adjusters differently from homeowners and never puts a payment link in an adjuster message.
Frequently asked questions
When should I send a past due invoice letter?
Send the first one within a day or two of the due date. Waiting a few weeks to "be nice" usually backfires, because the invoice slips down the customer's list and becomes harder to collect.
How many past due letters should I send before escalating?
Most contractors send three letters (friendly, firm and final) over about six weeks, with texts and calls in between. If the customer has not paid or responded after the final notice, it is time to decide on a lien, a collections agency or small claims.
Can I charge a late fee in a past due letter?
Only if your contract or invoice terms allow it and your state permits it. Late fees must be agreed in advance. You cannot add one for the first time in a past due letter.
Should I mention a mechanic's lien in my letter?
Only when you are prepared to file one and you are still within your state's deadline. Lien rules and notice requirements vary by state, so check with a construction attorney before you mention it.
What if the customer disputes the invoice?
Pause the reminders, call them, and find out exactly what they disagree with. Fix what is fair, document what you agreed, and send an updated invoice. Then restart the schedule if it is still unpaid.
Is it okay to send past due reminders by text?
Yes, for customers who have given you their mobile number for the job. Keep texts short, identify your business, include the payment link, and stop texting anyone who replies STOP.
Related reading
Your invoice, not a feature tour.
Bring one overdue invoice to a demo and see what AR Workflow would send, when, and how your customer would pay.
Photos: Unsplash. This article is general information, not legal advice.