Agency Invoice Payment Request Email Template

TL;DR. An agency invoice payment request email is sent to clients when a project milestone or billing period is complete. The best invoice payment request emails include all payment details in one place, attach the PDF invoice, and give clients a one-click online payment option alongside bank transfer details.

When to send an agency invoice payment request email

• On the same day the billing period closes or a milestone is delivered.
• Monthly for retainer clients — on a fixed date to set expectations.
• Followed by a polite reminder 3–5 days before the due date if unpaid.

What to include in an agency invoice payment request email

• Invoice number, project name, billing period, and total amount due.
• The due date — prominent, not buried in a paragraph.
• Both bank transfer details and an online payment link.
• The PDF invoice as an attachment for the client's accounts payable records.

Subject line examples

• "Invoice #{{invoice_number}} from {{agency_name}} — due {{due_date}}"
• "{{project_name}} — Invoice #{{invoice_number}} for {{invoice_amount}}"
• "Payment request: Invoice #{{invoice_number}} — {{billing_period_end}}"

FAQ

What should an agency invoice payment request email include? Include the invoice number, billing period, amount due, due date, and at least two payment methods. Attaching the PDF invoice reduces back-and-forth with clients whose accounting teams need a formal document separate from the email.

How should an agency write a professional invoice payment request email? Use a neutral, direct tone — not apologetic ("sorry to ask") or aggressive. State the facts: invoice number, amount, due date, and payment options. Save warmth for the closing line. Overly casual invoice emails are taken less seriously by client finance departments.

When should an agency send a follow-up if an invoice is unpaid? Send a reminder 3 days before the due date for large invoices, and again on the due date if still unpaid. A second follow-up 5–7 days after the due date is appropriate before escalating. Keep reminder emails brief and non-accusatory — most late payments are administrative, not intentional.