How to Send an Invoice Professionally via Email: Templates & Tips
Elena Rostova, Billing Architect Published: 2026-06-08 5 min read
Even the most beautifully formatted invoice won't get paid if the email request is unprofessional. Learn how to draft email requests that encourage prompt payment.
Table of Contents
1. High-Priority Email Subject Lines
Keep the subject line clear and informative. Avoid vague subject lines like "Invoice." Instead, write: "Invoice [Number] - [My Company Name] - Due [Date]".
2. Professional Email Body Template
Keep the message concise and friendly. State that the invoice is attached, list the total due, note the due date, and thank them for the collaboration.
3. Attach Clean PDF Formats
Always send invoices as PDF attachments. Never send editable formats like Word or Excel documents, as these can easily be accidentally modified.
Frequently Asked Questions
What should I do if a client misses the invoice due date?
Send a polite email reminder on the day after the due date. Re-attach the PDF invoice and request a status update on the payment.