Anyone who has chased a late invoice knows the replies. One Hacker News commenter listed the ones they'd heard customers give their boss:
oh no it's past our finance day it will have to be next month, no the only person who can sign cheques isn't here, no we don't have your invoice
Every one of those has an answer, and a routine makes sure you give it every time. Plenty of owners need one. In Intuit QuickBooks' 2026 Small Business Late Payments Report, 59% of businesses said at least some of their invoices were 30 or more days overdue, up from 47% a year earlier, and businesses with unpaid invoices were owed $17.7K on average (Intuit QuickBooks). This guide is the follow-up routine that gets that money in: a day-by-day timeline, emails you can copy, a phone script, and the point where you stop being patient.
How to follow up on an overdue invoice: the short answer
Send a friendly reminder the first business day after the due date, with the invoice attached. A week later, send a firmer email that asks for a payment date. At about two weeks, call the person who approves payments and get a specific date, then confirm it in writing. At 30 days, send a final notice with a deadline and what happens next.
Before it's late: make the invoice easy to pay
A lot of collections work happens before the invoice is late. Before you chase anyone, check that your invoices have:
- A due date, not just terms. "Due October 15" is harder to drift past than "Net 30."
- The right recipient. For a business customer, that's usually accounts payable, plus the person who hired you. Ask who approves payments when you take the job.
- Any purchase order or job number the customer's office needs to match your invoice to the work.
- A way to pay online, in addition to a check.
- Your terms on late payment, if you have them, so they're agreed before there's a problem.
For larger jobs, a deposit changes the whole dynamic. One consultant's advice after an unpaid $8,000 job:
Start requiring a retainer applied against final invoice. Clients who won't write you a check upfront, are less likely to develop the habit of writing you checks later.
The follow-up timeline
Here's a sequence you can adapt for a business that bills other businesses. Count the days from the due date.
| Day | What to send | Tone | What you want |
|---|---|---|---|
| 3 days before | Courtesy reminder (optional) | Friendly | The invoice in front of the right person |
| 1 | Reminder email with the invoice attached | Friendly | Payment, or a reply |
| 7 | Second email asking for a date | Polite, direct | A payment date |
| 14 | Phone call to whoever approves payments | Calm, specific | A date and an amount, confirmed in writing |
| 21 | Email confirming the call, or chasing the missed date | Firm | Payment on the promised date |
| 30 | Final notice with a deadline | Firm, formal | Payment, or a plan with money up front |
| 45 and later | Pause new work; collection agency or small claims | Formal | Your money, or a clean end |
Email templates you can copy
Keep every email short, attach the invoice every time, and put the invoice number and amount in the subject line so it's searchable in their inbox.
Day 1: the friendly reminder
Hi Dana, a quick note that invoice 1043 for the September maintenance work ($2,400) was due yesterday. I've attached it again in case it got buried. You can pay online here: [link]. Thanks!
Day 7: asking for a date
Hi Dana, following up on invoice 1043 ($2,400), which is now a week past due. Could you let me know when it's scheduled to be paid? If anything about the invoice needs fixing on our end, tell me and I'll take care of it today.
The last line matters. It invites the real reason ("we need a PO number," "the amount doesn't match the quote") to come out now instead of at day 45.
Day 21: confirming a promised date
Hi Dana, thanks for taking my call. Confirming what we agreed: invoice 1043 for $2,400 will be paid by October 2. I'll keep an eye out for it.
Day 30: final notice
Hi Dana, invoice 1043 for $2,400 is now 30 days past due, and I haven't been able to get a payment date. Please pay by October 20. If I can't get payment or a payment plan by then, I'll have to pause any new work and pass the invoice to a collection agency. I'd much rather sort it out with you directly, so call me at [number] if there's a problem.
Only write a consequence you'll actually carry out. A threat you don't follow through on teaches the customer to wait you out.
The phone call: what to say
Calls feel awkward because the stakes feel personal. They usually aren't, for the other side:
it feels like a big deal to you but it wont feel that way to them.
The excuses from the top of this guide each have an answer, and the table below gives one.
Who to call. Not the person who hired you, if they don't control payments. Ask for accounts payable or whoever approves invoices. One contractor who recovered a payment that ran months late did exactly that:
I found out who the right person was, and pinged them every two weeks. Very politely, just "Hi, noticed this invoice wasn't paid. Please remit payment" etc.
The script.
- Open plainly: "Hi, this is Sam from Northside Heating. I'm calling about invoice 1043 for $2,400, which was due on the 15th."
- Ask an open question: "Can you tell me where it is in your process?"
- Ask for a date and an amount: "When will it be paid?" If they say "soon," ask "What date should I expect it?"
- Repeat it back: "So $2,400 by October 2. I'll send you an email confirming that."
- Send the confirmation email before you do anything else.
Common answers, and what to say back:
| They say | You say |
|---|---|
| "We never got the invoice." | "No problem. What email should it go to? I'll send it while we're on the phone and call back Thursday to confirm it's in the system." |
| "The person who signs checks is out." | "When are they back? I'll call that day. Can you put it in front of them first thing?" |
| "It'll go out in the next payment run." | "When is the next run, and is invoice 1043 on it?" |
| "There's a problem with the work." | "I'm sorry to hear that. What's the problem? If part of the invoice is in dispute, can you pay the rest now while we fix it?" |
| "We can't pay all of it right now." | "I understand. What can you pay this week, and when can you pay the rest?" Then put the plan in writing. |
If you get voicemail, keep it under 20 seconds and leave the specifics:
Hi Dana, it's Sam from Northside Heating. I'm calling about invoice 1043 for $2,400, which was due on the 15th. I've emailed it to you again. Could you call me back at [number] or reply to that email with a payment date? Thanks.
Always email a summary afterward. As one freelancer put it on Stack Exchange, start by contacting them "both by email (establish a paper trail) and phone" (markcoatsworth on Freelancing Stack Exchange).
When to stop work, and when to escalate
Pause new work for a customer who isn't paying. It's the strongest lever a small business has, and it costs nothing. The contractor quoted above told a client in the same position: "I'd love to continue to work, but I have late invoices, and I can't do any additional work until you are caught up" (mooreds on Hacker News). Their other advice applies too: if you agree to a payment plan, get a meaningful chunk up front, and make sure the payment clears before you start again.
Offer a plan, in writing. Part now, the rest on dates you both agree, in an email they reply to.
Use a collection agency when a customer stops responding or breaks promised dates more than once. Agencies typically keep a share of what they recover, so compare terms before you sign.
Consider small claims court for amounts under your state's limit. It's designed for people without lawyers, and limits differ by state, so check your state court's site (National Center for State Courts).
Late fees: when they help and when they don't
A late fee works when the customer agreed to it before the job, in your contract, estimate, or written terms, and it stays within your state's limits. Added after the fact, it usually starts an argument. Some owners skip late fees for good customers who are reliably a little slow:
My best paying clients (e.g. multinationals) generally always pay late by one to a few weeks.
A reasonable middle path: put the fee in your terms for every customer, and waive it, once, for a customer with a good record. Waiving it is a favor you can mention. Charging an unannounced one is a dispute.
Keep it legal and professional
Chasing your own invoices is mostly a matter of good manners and good records, but a few guardrails apply:
- The federal Fair Debt Collection Practices Act covers consumer debts, those "primarily for personal, family, or household purposes," and mainly applies to third-party debt collectors. It excludes a creditor's own officers and employees collecting "in the name of the creditor" (15 U.S.C. § 1692a). Using a made-up collections name for your own business brings you under it.
- State rules differ. If your customers are homeowners rather than companies, check your state's debt collection rules before you start calling.
- Stay factual. Don't threaten anything you can't legally do, don't call at unreasonable hours, and don't discuss the debt with anyone except the customer and their staff.
This is general information, not legal advice. Your attorney can tell you what applies in your state.
Keep a log
For each overdue invoice, write down every email and call: the date, who you spoke to, and what they promised. It turns "I think they said next week" into "Dana promised $2,400 by October 2," which is what a payment plan, a collection agency, or a small claims judge will ask for.
Where Ruth fits
This routine works, but only if someone runs it every week. That's what Ruth does. Ruth is Clef's AI bookkeeper, and she works by text. On her Keeper plan, when an invoice is late, she sends a reminder email, then calls the customer, and nothing goes out until you say OK. She gets a date they'll pay and keeps following up until they do, and every call has a transcript and an outcome. See how Ruth collects late invoices.
Frequently asked questions
Should I call instead of emailing if a client goes quiet?
Yes, once two emails have gone unanswered. Call the person who approves payments, not just the person who hired you, and ask for a specific date. Then confirm that date by email the same day so it's in writing.
How many reminders should I send before giving up?
There's no magic number, but a clear sequence helps: a reminder the day after it's due, a second email at a week, a call at about two weeks, and a final notice with a deadline at 30 days. If that deadline passes with no payment and no plan, stop sending reminders and escalate.
Can you charge a late fee on an overdue invoice?
Only if the customer agreed to it before the work, in your contract, estimate, or written terms, and within your state's limits. A fee added after the fact usually starts an argument rather than ending one. Put it in your terms for the next job.
When should you send an overdue invoice to collections?
When the deadline in your final notice passes with no payment and no plan, or when the customer stops responding or breaks a promised date more than once. A collection agency keeps a share of what it recovers, and small claims court is the other route for amounts under your state's limit.