How to Chase an Outstanding Invoice Politely (With Templates)

An outstanding invoice is one you have issued that has not been paid yet; it becomes past due the day after its due date. The polite way to chase it is a predictable sequence: a friendly reminder just before the due date, short factual follow-ups at fixed intervals after it, a phone call once it is two weeks late, and a final written notice that says exactly what happens next. Many late invoices are stuck in a process, not withheld on purpose, so your job is to make paying you the easiest thing on the customer's list.

Why invoices go past due

Before you write a single reminder, it helps to know the usual reasons an invoice sits unpaid:

• It went to the wrong person, or to someone who has since left.
• It is missing something the customer's accounts team needs: a purchase order number, the right legal entity name, a tax ID, or a cost-centre reference.
• It is waiting for an internal approval at the customer's end.
• There is a quiet dispute about quantity, quality or scope that nobody has told you about.
• The customer genuinely has a cash-flow problem.

Only the last one is about money. The first four are fixed with information, which is why a good first reminder asks a question rather than making a demand.

Check your own invoice first

• Is the amount right, and does it match the quote, contract or purchase order?
• Does it show the due date and payment terms clearly, not just "Net 30"?
• Does it say how to pay: bank details, a payment link, or both?
• Has a payment already arrived that you have not matched to the invoice? Chasing a customer who has paid is the fastest way to damage a relationship.

A follow-up schedule that stays polite

Pick a cadence and stick to it. Consistency is what makes reminders feel routine rather than personal. A workable sequence for a 30-day invoice:

1. 3 days before the due date — a courtesy heads-up.
2. On the due date — a short "due today" note with the payment link.
3. 7 days past due — a first overdue reminder that asks if anything is holding it up.
4. 14 days past due — a phone call, followed by an email recording what was agreed.
5. 30 days past due — a firmer email naming the next step.
6. 45 days past due — a final notice with a specific deadline.

Adjust the intervals to your terms and industry, but decide them in advance so you are not making a judgement call every time.

Sample follow-up wording you can adapt

Before the due date

Subject: Invoice 1042 due on 1 October

Hi Priya, a quick heads-up that invoice 1042 for 8,400.00 is due this Thursday, 1 October. The invoice and a payment link are attached. If anything on it needs changing for your approval process, let me know and I will reissue it today. Thanks, Sam

On the due date

Subject: Invoice 1042 is due today

Hi Priya, just a reminder that invoice 1042 for 8,400.00 is due today. You can pay by bank transfer to the details on the invoice or through the payment link. If it has already gone out, thank you, and please ignore this note. Sam

7 days past due

Subject: Invoice 1042, now 7 days overdue

Hi Priya, invoice 1042 for 8,400.00 was due on 1 October and I have not seen payment yet. Is anything holding it up on your side, such as a missing PO number or a question about the work? If someone else handles payables, could you point me to them? A copy of the invoice is attached. Thanks, Sam

After the phone call

Subject: Invoice 1042, confirming our call

Hi Priya, thanks for your time on the phone today. To confirm what we agreed: your accounts team will release payment of 8,400.00 for invoice 1042 by Friday, 16 October. I will check in on Monday, 19 October, if I have not seen it by then. Sam

30 days past due

Subject: Invoice 1042, 30 days overdue, action needed

Hi Priya, invoice 1042 for 8,400.00 is now 30 days past its due date, and the payment we discussed for 16 October has not arrived. I need to settle this by 7 November. If paying the full amount at once is a problem, reply with a proposed schedule and I will look at it. Under our agreed terms, I will pause further work on the account if the balance is still open after that date. Sam

Final notice

Subject: Final notice, invoice 1042

Hi Priya, this is a final notice for invoice 1042 for 8,400.00, now 45 days overdue. Please pay in full by 21 November. If the balance is still outstanding after that date, I will add late payment charges as set out in our terms and refer the debt for collection. I would much rather resolve this directly, so please call me if there is anything we should discuss. Sam

Notice what these do: each one restates the invoice number, amount and original due date; each one makes paying easy; none of them guesses at the customer's motives; and the firmer ones name a consequence you are actually prepared to carry out.

A short phone script for the 14-day call

• "Hi, it is Sam from Northbank Studio. I am calling about invoice 1042 for 8,400, which was due on 1 October. Have you received it?"
• "Is there anything on it that is stopping it from being approved?"
• "When can I expect payment?" Then stay quiet and let them answer.
• "Great, I will send you an email confirming that date."

Worked example: a Toronto marketing agency

Northbank Studio, a three-person agency, issues invoice 1042 for 8,400.00 on 1 September with 30-day terms, so it falls due on 1 October.

1. 28 September: courtesy reminder sent. No reply.
2. 1 October: "due today" note sent. No reply.
3. 8 October: 7-day reminder asks what is holding it up. The client replies that the invoice is missing their new purchase order number. Northbank reissues it with the PO the same day.
4. 15 October: still unpaid, so Sam calls. The payables clerk confirms the reissued invoice is approved for the 16 October payment run. Sam confirms by email.
5. 19 October: payment has not arrived. Sam emails; the client says cash is tight and offers 4,200.00 now and 4,200.00 on 19 November. Sam accepts and records both dates in writing.
6. 1 November: on the aging report, the remaining 4,200.00 sits in the 31 to 60 days bucket. Sam sends a short note a few days before 19 November confirming the second instalment.

The real fix came at step 3, a missing PO number, which a demand letter would never have uncovered. The payment plan at step 5 traded a few weeks of waiting for keeping a client who had a genuine short-term problem.

Late fees and statutory interest: know your rights

You can only charge late fees or interest if your contract or terms allow it, or if a law gives you the right. Rules vary by country; three examples:

• United Kingdom: under the Late Payment of Commercial Debts (Interest) Act 1998, a business can claim statutory interest of 8 percentage points above the Bank of England base rate on late business-to-business payments where no other rate is agreed, plus a fixed sum per invoice of £40, £70 or £100 depending on the size of the debt.
• India: under the MSMED Act, a buyer must pay a registered micro or small enterprise within the agreed period, which cannot exceed 45 days from acceptance (15 days if nothing was agreed). If it pays late, the buyer owes compound interest with monthly rests at three times the bank rate notified by the Reserve Bank of India, and the supplier can approach the state's Micro and Small Enterprises Facilitation Council.
• United States: there is no general federal late-payment law for business invoices. Late fees and interest come from your written terms, and state laws can cap how much interest you may charge, so check your state's rules before you set a rate.

Whatever applies, state it on the invoice up front. A late fee that appears for the first time in a final notice feels like a threat; one that was on every invoice feels like policy.

Common mistakes when chasing payment

• Waiting weeks after the due date before the first reminder.
• Sending angry or sarcastic messages, or copying in the customer's boss on the first chase.
• Threatening steps you will not take, such as legal action over a small sum.
• Agreeing a payment plan on the phone without confirming it in writing.
• Continuing to deliver new work to an account that is months behind.
• Chasing an invoice that has been paid but not matched in your books.

hellobooks< / a > -helps-you-get-paid-on-time">How HelloBooks helps you get paid on time

HelloBooks sends automated reminders on overdue invoices on a schedule you set, so the routine nudges happen without anyone remembering to send them. Every invoice can carry a payment link for online payment through Stripe, Razorpay or PayPal. The AR aging report shows which invoices are 1 to 30, 31 to 60 or over 60 days late, and customer statements with aging give a client one clear view of everything they owe. Bank feeds and find and match let you pair incoming payments with invoices, so you do not chase someone who has already paid. You still make the phone calls and decide when to agree a plan; the software keeps the schedule and the records.

This is general information as of November 2026, not legal advice. Late-payment rights depend on your contract and local law, so check the official source or a qualified adviser for your situation.