What should be written in the email body when sending an invoice?

Keep the email polite, clear, and concise. State the invoice number, total amount due, payment due date, brief summary of work, attached PDF file name, and direct payment link or bank details.

When is the best time to send an invoice to a client?

Send the invoice immediately upon project completion or on agreed recurring billing dates (e.g. 1st or 15th of the month). Immediate invoicing reduces payout turnaround time.

How should I politely follow up on an overdue invoice?

Send a courteous email 3 days before the due date, on the due date, and 7 days after the due date with a copy of the attached invoice. Reiterate payment terms and offer to answer any questions.

How to Send Invoices to Clients — Email Templates, Follow-Up Schedules & Payment Tips

Effective ways to deliver invoices: email templates, professional billing protocols, and payment reminder schedules.

How to Send Invoices to Clients — Email Tips & Payment Follow-Up

Delivering invoices effectively is just as important as writing them. Sending invoices with clear email subject lines, PDF attachments, payment links, and payment term reminders can significantly reduce payment delays.

This guide covers the three most common delivery methods (email, postal mail, and client portals), provides ready-to-use email subject line templates, and outlines a practical follow-up schedule for overdue payments.

Written by the Invio Team — invoicing tools built for freelancers and small businesses worldwide

Last updated: July 2026

This guide is for informational purposes only. For tax or legal advice specific to your jurisdiction, consult a qualified accountant or tax professional.