How to Send an Invoice via Email

A well-sent invoice gets paid 2–3x faster than one buried in a thread.

The 5-part formula

1. Right recipient — accounts@ or the person who signed the contract
2. Clear subject line — invoice number + amount
3. Short, professional body
4. PDF attachment
5. Payment link in the email body

Subject line templates

• Invoice #1042 — 1,200 USD due 30 July
• Invoice from [Your Business] — [Project Name]

Body template

Hi [Name], please find attached invoice #1042 for [project] — total 1,200 USD, due 30 July 2026. Pay online: [link]. Let me know if anything looks off. Thanks!

Best time to send

• Tuesday or Thursday morning — highest open rates
• Avoid Fridays after 3pm
• Send immediately after delivery

Attachments

• Always PDF
• Filename: Invoice-1042-YourBusinessName.pdf
• Under 5MB

Invoxa generates the PDF, writes the email, attaches a one-click payment link, and tracks opens — free.