A professional invoice email is short, clear, and makes it easy for the client to pay. The invoice does the heavy lifting — the email just needs to deliver it and set expectations.

Step 0: Create the PDF first

Do not draft the email before the invoice is finished. In Amazing Invoice:

  1. Fill company + client details and line items
  2. Set invoice number, due date, and payment instructions
  3. Download a PDF with a clear name like Invoice-2026-034-ClientName.pdf

You need that file before the email is useful.

Before you hit send

Double-check the PDF:

  • All line items, totals, and tax are correct
  • The due date is clearly stated
  • Payment details are on the invoice (bank info, PayPal, payment link)
  • The attachment is a PDF (not Word or a screenshot)
  • The filename is searchable for you and the client

Writing the Email

Keep the email body brief. The client should be able to read it in under 10 seconds.

Subject Line

Use a clear, searchable subject line:

  • "Invoice #2026-034 from [Your Business Name]"
  • "Invoice for [Project Name] — Due Dec 11, 2026"
  • "[Your Business Name] — Invoice #034 ($2,500)"

Avoid vague subjects like "Invoice" or "Payment" — they get lost in busy inboxes.

Email Body Template

Here is a template you can adapt:

Hi [Client Name],

Please find attached Invoice #2026-034 for [brief description of work].

Amount due: $2,500.00

Due date: December 11, 2026

Payment can be made via bank transfer or PayPal. Details are on the invoice.

Let me know if you have any questions.

Thanks,

[Your Name]

For Recurring Clients

Hi [Client Name],

Attached is your invoice for [month/service]. Same payment details as always — let me know if anything has changed on your end.

Amount: $1,200.00

Due: November 30, 2026

Thanks,

[Your Name]

Best Practices

  • Send the invoice the same day you finish the work. Delays signal that payment is not urgent.
  • Attach the PDF — do not paste the invoice in the email body. PDFs are printable, archivable, and look professional.
  • Include the amount and due date in the email. The client should not have to open the attachment to know the basics.
  • Use a professional email address. Send from your business email, not a personal Gmail.
  • CC yourself so you have a sent record with timestamp.

Following Up

If the due date passes without payment:

  • Day 1 after due date: Send a polite reminder (see our guide on following up on unpaid invoices)
  • Day 7: Follow up again, referencing the original email
  • Day 14+: Call the client directly

Common Mistakes

  • Sending without a PDF attachment. Forgetting the attachment is more common than you think. Double-check before hitting send.
  • Using BCC to invoice multiple clients. Each client should receive an individual, personalized email.
  • No subject line or a vague one. "Invoice" alone makes it hard for the client to find later.
  • Not including payment details in the invoice. If the client has to email you back to ask how to pay, you have added friction.
  • Sending from a no-reply address. The client needs to be able to reply with questions.