Overdue Invoice Letter Template: 4 Editable Examples

Check the balance before you call it overdue

Start with the invoice, the agreed due date and the payment record. A transfer may be in progress, a credit may have been missed, or the client may need a purchase-order number. Check the recipient too: the person who approved the work may be different from the person who pays invoices.

• Confirm the invoice number, currency, original amount and due date.
• Subtract payments received and agreed credits. Request only the remaining balance.
• Check for a dispute or promised payment date in the existing email thread.
• Attach the correct invoice or a stable link to it, and verify the payment instructions.

The Australian Government's payment-terms guidance recommends a polite phone or email reminder as an initial step. The examples here use that communication approach; Australian recovery rules are not being applied to an Indian invoice.

A polite first reminder

Use this when the due date has passed and you have not received a payment update. State the facts without assuming the client is refusing to pay.

Subject: Payment update for invoice [invoice number]

Hi [name],

I’m following up on invoice [number] for [project or service]. The outstanding balance is [currency and amount], and the agreed due date was [date].

I’ve attached the invoice for reference. Could you confirm the expected payment date, or let me know if your accounts team needs anything else from me?

If payment is already on its way, please share the payment reference so I can match it to the invoice.

Thanks,
[your name and business]

Worked example: invoice BT-104 is for ₹18,000, due 31 August 2026. No payment or credit has been recorded. In a reminder dated 7 September, the balance is ₹18,000 and the invoice is seven days overdue. Those are example facts, not a recommended grace period for every contract.

A follow-up when the first reminder gets no reply

Keep the original invoice reference and ask for a reply by a date you choose. A reply deadline asks for information; it does not quietly rewrite the invoice's agreed payment terms.

Subject: Following up: invoice [number], [amount] outstanding

Hi [name],

I’m checking back on my message of [date] about invoice [number]. My records still show [amount] outstanding, due on [original due date].

Please reply by [date] with the planned payment date. If there is an issue with the invoice or completed work, please describe it so we can address it.

Could you also confirm the right accounts contact if someone else handles payment?

Thanks,
[your name]

Choose the timing from the relationship, the agreement and previous replies. Sending the same message repeatedly without reading the response can create confusion. Record the reminder date and the next action in a simple list.

A reminder after a partial payment

Acknowledge money already received before asking for the balance. That makes the calculation visible and avoids appearing to chase the full invoice twice.

Subject: Remaining balance on invoice BT-104

Hi [name],

Thank you for the ₹6,000 payment received on [date]. Against invoice BT-104 for ₹18,000, my records show a remaining balance of ₹12,000, with no agreed credits.

Could you confirm when the remaining balance will be paid? If your records differ, please send the payment references or credit details so we can reconcile them.

Thanks,
[your name]

If the client reports a different balance, resolve the difference before sending a stronger reminder. Do not add an unagreed fee to make the totals match.

Overdue payment letter format

If an accounts department needs a formal letter, use the same facts with an address, date and subject. This format remains an ordinary payment reminder.

[Your business name and contact details]
[Date]
[Client business name and billing contact]

Re: Outstanding balance for invoice [number]

Dear [name],

Our records show that [currency and amount] remains outstanding for [service], invoiced on [invoice date] and due on [due date]. Payments of [amount] and agreed credits of [amount] have been applied to the original total of [amount].

Please confirm your payment date by [reply date]. A copy of the invoice and the payment instructions are enclosed. If you believe the balance is incorrect, please contact [name and email] with the relevant details.

Yours sincerely,
[Your name and role]

Before sending, remove every placeholder and check the attachments. Keep a copy with the invoice and any subsequent reply. For disputed work or formal recovery action, review the agreement and get advice appropriate to the transaction; a reminder template cannot decide those rights.

For a general sequence of checking terms and contacting the customer, see business.gov.au's unpaid-invoice guidance.