How to Send an Invoice (Email Steps + What to Say)
Writing a good invoice is only half the job — how you send it affects how fast you get paid. A clear email with the right attachment and a polite nudge makes it easy for the client to act. A vague one gets ignored. Here is a simple, repeatable way to send invoices that land well.
Step 1: Finish the invoice and export a PDF
Before you write a single line of email, make sure the invoice itself is complete: a unique invoice number, issue and due dates, itemized charges, tax, and the total. Export it as a PDF so the layout stays intact on any device. If you need a quick way to produce one, our free Invoice Generator gives you a print-ready PDF in minutes. Not sure what belongs on it? See how to write a professional invoice.
Step 2: Write a clear subject line
The subject line is what a busy accounts payable clerk scans first. Make it specific: include your business name, the invoice number, and the due date. For example: Invoice INV-0007 from Bright Studio — due August 15. This makes the email easy to find later and signals exactly what it is.
Step 3: Keep the email body short and polite
The body is a cover note, not the invoice. Thank the client, state what the invoice is for, note the amount and due date, and point to the payment method. A few sentences is plenty — the detail lives in the attached PDF.
A copy-paste email template
Hi [Client name], thank you for your business. Please find attached invoice [INV-0007] for [brief description of work], totaling [$ amount]. Payment is due by [date] via [bank transfer / payment link]. If you have any questions about the invoice, just reply to this email and I'll be happy to help. Best regards, [Your name].
Step 4: Follow up on time
If the due date passes without payment, a short, friendly reminder usually does the trick — most late payments are simple oversights, not refusals. State the payment terms clearly up front (for instance Net 30) so the deadline is never a surprise.
Frequently asked questions
How should I send an invoice to a client?
The most common and reliable way is by email, with the invoice attached as a PDF. PDF keeps the layout intact on any device and can't be edited accidentally. Paste a short, polite message in the email body and put the invoice number in the subject line.
What should the invoice email subject line say?
Keep it clear and searchable, for example: "Invoice INV-0007 from [Your Business] — due Aug 15." Including the invoice number and due date helps the client's finance team find and process it quickly.
When is the best time to send an invoice?
Send it as soon as the work is delivered or the milestone is reached. The payment clock usually starts from the invoice date, so every day you delay sending is a day added to when you get paid.
Should I send the invoice as a PDF or in the email body?
Attach it as a PDF. A PDF looks professional, prints cleanly, and can't be altered. Use the email body only for a short cover note, not for the invoice details themselves.
Ready to create the invoice itself? Start with our free Invoice Generator — no sign-up, and you download the PDF straight from your browser.