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How to chase unpaid invoices: a reminder cadence and email templates that get you paid
Most overdue invoices aren't refused. They're lost, stuck in someone's approval queue, or simply nobody's priority. Here is a reminder schedule that moves from polite to firm, the messages to send at each step, and what to do when reminders stop working.
Short answer
To chase unpaid invoices, follow a written schedule instead of chasing when you remember: a friendly reminder a few days before the due date, another on the due date, then follow-ups at roughly 7, 14, 30 and 45 days past due, switching from email to a phone call by about day 14. Every message should name the invoice, amount and due date and include a payment link. If an invoice reaches 60 to 90 days with no response after a written final notice, decide between a payment plan, a collection agency, small claims court or (in construction) your lien rights.
Key takeaways
- The fastest way to get paid is to make the invoice correct, complete and easy to pay before it is ever late.
- A fixed cadence beats heroic effort. Most late invoices need two or three reminders, not a confrontation.
- Tone should step up gradually: friendly, then direct, then formal. Never threatening, and never inventing consequences.
- Late fees and interest generally need to be agreed in advance and are limited by state law.
- Software can send reminders on schedule. The time sink is reading replies, sorting disputes and logging promises, which is where an AI agent with a human backstop helps.
Why invoices go unpaid
Most invoices go unpaid for boring, fixable reasons, and treating every late payer as a deadbeat makes the fixable ones harder to collect. Before you write a firm email, it helps to know which situation you're in.
- The invoice never reached the right person. It went to the site super, a general inbox, or the homeowner's spouse who doesn't pay the bills. This is the most common reason and the easiest to fix.
- Something is missing. A purchase order number, a signed work order, a lien waiver, a W-9, photos of completed work, or backup for a change order. Commercial customers often can't pay without it, and they rarely tell you.
- It's stuck in an approval process. Larger customers and general contractors run invoices through approval steps and fixed payment runs. Missing a cutoff can add weeks.
- There's a quiet dispute. The customer thinks the job isn't finished, the price is higher than expected, or a callback is still open. They hold payment instead of saying so.
- Cash is tight. They intend to pay, but you're lower on their list than the vendors who chase.
- They don't plan to pay. This is the smallest group, and the only one that needs the escalation steps later in this guide.
A good reminder process is designed to flush out the first five quickly, so that by day 30 or 45 you know exactly which invoices are genuinely at risk.
What slow payment is costing you
Slow payment costs you in three ways: the cash you can't use, the borrowing or delayed bills it forces, and the staff time spent chasing. The first one is easy to put a number on.
Illustrative example: a contractor billing about $150,000 a month on net 30 terms finds that customers actually pay in 50 days on average. Those extra 20 days mean roughly $100,000 more is tied up in receivables than if everyone paid on time ($150,000 a month is about $5,000 a day, times 20 days). If the business is covering that gap with a credit line at, for example, 10% a year, that's on the order of $10,000 a year in interest, before counting the hours spent on the phone or the early-pay discounts on its own bills that it can't take. These numbers are hypothetical; run the same math with your own receivables and terms.
Older invoices are also harder to collect. The longer an invoice sits, the more likely the contact has changed, the details are forgotten, or the customer has decided not to pay. Consistent follow-up in the first 30 days is worth more than heroic effort at day 120.
Prevent the chase before it starts
The cheapest collection call is the one you never have to make. A few habits at the invoicing stage shorten the time to payment more than any reminder will.
- Agree on terms before the work. Put payment terms, due dates, accepted payment methods and any late fee in the estimate, contract or work order the customer signs. "Due on receipt" is common for residential service work; commercial and construction work often runs net 30 or follows a draw schedule.
- Invoice the same day the work is done. Every day between job completion and invoice adds a day to when you get paid. Field service tools like Jobber, Housecall Pro and ServiceTitan can let techs invoice and collect on site, depending on your setup.
- Send it to the person who pays. Ask "who handles payment, and where should invoices go?" at the start of every new customer relationship. For commercial customers, get the AP contact's name and email.
- Include everything they need to approve it. PO number, job address, description of work, completion date, change order references, and any required documents. For construction progress billing, make sure your pay application is complete; see how to automate construction draw requests.
- Make it easy to pay. A payment link for card or ACH in the invoice email removes the "I'll mail a check" delay. Card fees are a real cost; weigh them against the days saved.
- Collect deposits or progress payments on larger jobs. It reduces how much is at risk on any one invoice.
A reminder cadence from polite to firm
Write your cadence down and apply it to every open invoice, so follow-up doesn't depend on who has time this week. The schedule below is a sensible starting point for net 30 commercial work; for due-on-receipt residential invoices, compress the early steps.
| When | Channel | Tone and purpose |
|---|---|---|
| 3–5 days before due | Friendly heads-up; resend the invoice and payment link; confirm it reached the right person | |
| Due date | Email (text for residential, with consent) | Neutral reminder that payment is due today |
| 7 days past due | Polite; ask whether anything is holding it up | |
| 14 days past due | Phone call, then email recap | Direct; find the blocker; get a specific payment date |
| 30 days past due | Email and call | Firm; reference terms and any agreed late fee; consider pausing new work |
| 45 days past due | Call from owner or manager | Senior escalation; offer a payment plan if appropriate |
| 60 days past due | Written final notice (email and mail) | Formal; state the next step and the date it will happen |
Three rules override the schedule:
- A reply pauses the automation. If the customer disputes the invoice, asks a question or promises a date, a person takes over and the next reminder is scheduled around their answer.
- A broken promise jumps the queue. If they said "Friday" and nothing arrived, follow up Monday, not at the next scheduled step.
- Every touch gets logged. Date, channel, who you spoke to and what they said. If you ever need to escalate, this record matters.
Payment reminder email templates
Each message should include the invoice number, the amount, the original due date, the job or project name, a copy of the invoice and a payment link. Keep them short. Here are templates to adapt.
Before the due date:
Subject: Invoice 1047 for 42 Elm St, due June 30
Hi Priya, a quick heads-up that invoice 1047 for $4,860 (water heater replacement at 42 Elm St) is due on June 30. A copy is attached and you can pay online here: [link]. If invoices should go to someone else on your team, just let me know. Thanks, Jordan
7 days past due:
Subject: Invoice 1047 is now past due
Hi Priya, invoice 1047 for $4,860 was due on June 30 and we don't show a payment yet. If it's already on its way, thank you and please disregard this. If something is holding it up, such as a missing PO or a question about the work, reply here and I'll sort it out. Pay online: [link]
14 days past due, after a call:
Subject: Following up on our call about invoice 1047
Hi Priya, thanks for talking today. As discussed, you'll send payment of $4,860 for invoice 1047 by July 18. I've attached the signed work order and completion photos you asked for. Payment link: [link]
30 days past due, firm:
Subject: Invoice 1047, 30 days past due
Hi Priya, invoice 1047 for $4,860 is now 30 days past due. Under the terms on the signed work order, a late fee of [agreed amount] applies to balances over 30 days. Please pay by [date] or call me directly at [number] so we can agree on a plan. We'd like to keep working together and want to get this resolved.
Final notice:
Subject: Final notice: invoice 1047
Hi Priya, despite our earlier reminders, invoice 1047 for $4,860 (plus [any agreed fee]) remains unpaid, 60 days past its due date. If we don't receive payment or hear from you by [specific date], we will [refer the account to a collection agency / file in small claims court / take the next step you will actually take]. We'd much rather resolve this directly. Payment link: [link]
Only state a consequence you're prepared to follow through on, and never threaten anything you can't legally do, such as contacting their employer or neighbors, or reporting them to someone with no role in the debt. Empty threats teach customers your deadlines don't mean anything.
General information, not legal advice. Debt collection is regulated at the federal and state level. Federal rules mainly cover third-party collectors, but some state laws also apply to businesses collecting their own debts, especially from consumers. Text messages and automated calls have their own consent rules. Check your obligations with an attorney before escalating, and get permission before texting customers.
Late fees and interest
Late fees can encourage on-time payment, but they only work if they are agreed in advance, reasonable and applied consistently. Adding a fee to an invoice the customer never agreed to usually starts an argument rather than ending one.
- Put it in the agreement. State the fee or interest rate, when it kicks in and how it's calculated in the contract, estimate terms or signed work order, then repeat it on the invoice.
- Check your state's limits. States cap interest rates and some limit late fees, with different rules for consumer and commercial customers. Your accountant or attorney can tell you what applies.
- Use it as leverage, not revenue. Many businesses waive the fee when an overdue customer pays promptly after the first firm reminder. That's a reasonable trade.
- Know your industry's rules. In construction, many states have prompt payment laws that set deadlines and interest on late payments for public and sometimes private projects. Whether they apply depends on the state, the project and your contract.
General information, not legal or tax advice. Late fee and interest rules vary by state and by type of customer. Review your contract terms and fee policy with a qualified professional.
When reminders stop working
Once an invoice is 60 to 90 days past due, the customer has gone quiet and you've sent a written final notice, it's time to pick an escalation path. Weigh the amount owed against the cost and time of each option.
| Option | Best for | Trade-offs |
|---|---|---|
| Payment plan | Customers who want to pay but can't all at once | Slower; get the plan in writing with dates and amounts |
| Pause or stop work | Ongoing customers and projects | Check your contract first; stopping work without the right can create its own claim against you |
| Collection agency | Unresponsive customers, smaller balances | Agencies typically keep a percentage of what they collect; ends the relationship |
| Small claims court | Clear amounts under your state's limit, good documentation | Filing fee and your time; a judgment still has to be collected |
| Attorney demand letter or lawsuit | Larger balances | Legal fees can eat into the recovery; ask about cost up front |
| Mechanic's lien (construction) | Contractors and subs on unpaid project work | Strict notice and filing deadlines that vary by state; often must be planned from the start of the job |
For construction businesses, lien rights are often your strongest tool, and also the easiest to lose by waiting. Many states require preliminary notices early in the job and set a filing deadline counted from your last day of work. Track those dates on every project, not just the ones that go bad; our guide to lien waiver management covers the paperwork side.
Whatever you choose, keep the full record: the invoice, signed agreement, proof of completed work, and your log of every reminder and conversation. That record is what an agency, a judge or an attorney will ask for first.
Manual, built-in reminders or an AI agent
Sending reminders is simple workflow automation. The hard part of accounts receivable follow-up is everything that happens after a customer replies. Here's how the approaches compare.
| Approach | What it handles well | Where it breaks |
|---|---|---|
| Manual (owner or bookkeeper) | Judgment, relationships, disputes, large balances | Busy weeks; chasing gets skipped when it's uncomfortable or nobody owns it |
| Built-in reminders (QuickBooks, Xero, Jobber and similar) | Sending scheduled reminder emails, and sometimes texts, depending on your plan | Replies land in an inbox; the same message goes to a customer who disputed the bill and one who forgot |
| AI agent with a human backstop | Sending, reading replies, attaching missing documents, logging promise-to-pay dates, drafting the next message, flagging disputes | Needs clear rules on what it can say, and a person reviewing escalations |
Start by turning on the reminders your accounting or field service software already includes. QuickBooks Online, Xero, Jobber, Housecall Pro and ServiceTitan all offer some form of invoice reminders depending on your plan and settings, and it's the cheapest improvement available.
An AI agent makes sense when the follow-up work is more than your office can keep up with. It can read a reply like "we never got the lien waiver," find and attach the document, and update the notes in your accounting system; recognize "we'll pay on the 15th" and schedule a check on the 16th; and route "this job isn't finished" to a person instead of sending another reminder. That routing is the human-in-the-loop part: disputes, payment plans, fee waivers and anything that touches the customer relationship stay with your team. For a broader look at where AI fits in the back office, see AI for bookkeeping and accounts payable.
Tarvora builds this kind of agent inside the tools you already use and shows you a free working prototype on your own open invoices before you commit. If you're weighing the cost, our guides on what AI implementation costs and shared-savings pricing explain how we're paid.
The numbers to track
A handful of numbers tell you whether collections are getting better or worse. Most accounting systems can produce them from an aged receivables report.
- Days sales outstanding (DSO): accounts receivable divided by revenue for the period, times the number of days in the period. If you had $90,000 in receivables at month end and billed $120,000 that month, your DSO is about 22 days ($90,000 ÷ $120,000 × 30). Compare it to your payment terms.
- Aging buckets: how much is current, 1–30, 31–60, 61–90 and over 90 days past due. Watch the over-60 bucket most closely.
- Reminder coverage: share of past-due invoices that received every scheduled touch. If this is well below 100%, fix it before anything else.
- Promise-to-pay kept rate: of the customers who gave you a date, how many paid by it.
- Top reasons for late payment: missing PO, wrong contact, dispute, cash flow. Each reason points to a fix earlier in the process.
Record a baseline for a month before you change anything, so you can tell whether the new cadence worked.
Frequently asked questions
How do you politely ask for payment on an overdue invoice?
Keep it short, specific and assume good faith. Name the invoice number, the amount, the original due date and the job, attach a copy of the invoice and include a payment link. Ask whether anything is holding it up, such as a missing purchase order or a question about the work. Most late payments are caused by lost invoices or internal approvals, not refusal to pay.
How often should you send payment reminders?
A common cadence is a friendly reminder a few days before the due date, another on the due date, then follow-ups at about 7, 14, 30 and 45 days past due. Move from email to a phone call by around day 14, and send a written final notice before any collections step. Stop the automated reminders as soon as the customer replies or disputes the invoice, and handle that conversation personally.
Can I charge a late fee on an unpaid invoice?
Generally only if the customer agreed to it in advance, for example in your contract, estimate terms or signed work order. State laws limit how much interest or how large a fee you can charge, and some industries and consumer transactions have extra rules. Check your state's rules and your contract wording with an attorney or your accountant before adding late fees.
When should I send an unpaid invoice to collections or small claims?
Many small businesses consider outside action once an invoice is 60 to 90 days past due, the customer has stopped responding, and a written final notice has gone out. A collection agency usually keeps a percentage of what it recovers. Small claims court can work for amounts under your state's limit and costs a filing fee and your time. Construction businesses may also have lien rights, but those come with strict deadlines that often start running from your last day of work, so check them early.
Can QuickBooks, Xero or Jobber send automatic payment reminders?
Yes, most accounting and field service platforms can send scheduled invoice reminders, depending on your plan and settings. These handle the sending well. They usually do not read the customer's reply, sort a dispute from a promise to pay, or update notes and next steps for you, which is where most of the follow-up time actually goes.
What is a good DSO for a small business?
Days sales outstanding (DSO) is roughly your accounts receivable balance divided by your revenue over a period, multiplied by the number of days in that period. A useful benchmark is your own payment terms: if you invoice net 30 and your DSO is 55, customers are paying more than three weeks late on average. Track the trend month to month rather than chasing an industry average.