Invoice email templates for every situation

What to write when you send an invoice

The email has one job: get the invoice to the person who approves it, with everything they need to pay on time. That means the invoice number, the amount, the due date, what the work was, how to pay and who to ask if something is wrong. Keep the body under 80 words and let the attached invoice carry the detail.

A checklist for every invoice email:

• A subject line someone can find later by searching for your name or the invoice number.
• A greeting by name, then one line on what the invoice is for.
• The amount and the due date written out, such as $1,950.00 due 24 November 2026.
• How to pay, or a note that bank details are on the invoice.
• The PDF attached, not a link that expires.
• Your name and a phone number or email for questions.

Subject line formulas for an invoice email

The subject line decides whether the email is opened and whether it can be found again. Lead with the word “Invoice” and the invoice number, then add your business name, the amount or the due date. If the client uses purchase orders, put the PO number first, because that is often how their accounts team files supplier mail.

The example businesses and amounts are made up. Use whatever invoice number format you already have; our invoice numbering guide explains how to keep numbers unique.

Invoice email template for a first invoice to a new client

A first invoice should confirm the basics the client’s accounts team will check: your legal or trading name, what was agreed and how to pay. It is also the moment to ask where future invoices should go. One extra line now saves weeks later, when an invoice sits unread in the inbox of someone who has moved on.

Template 1: first invoice to a new client

Subject: Invoice 2026-041 from Harbor Lane Design: $1,950.00 due 24 November

Hi Marcus, thanks for the work on the spring catalog. Attached is invoice 2026-041 for $1,950.00, covering the layout and two rounds of edits we agreed in the quote. Payment is due by 24 November 2026; bank details are on the invoice. Should future invoices go to you or to an accounts address? Best, Jordan Ellis, Harbor Lane Design

Templates for regular clients and monthly work

Once a client knows you, the email can be even shorter. What matters is consistency: the same subject format and the same day each month, so the client’s team learns to expect it. For retainers, name the period covered so there is no doubt about which month is being billed.

Template 2: repeat client, one off job

Subject: Invoice 2026-049 from Harbor Lane Design: $680.00 due 4 December

Hi Marcus, invoice 2026-049 for the trade show banner is attached: $680.00, due 4 December 2026. Same bank details as before. Thanks, Jordan

Template 3: monthly retainer

Subject: November invoice for bookkeeping, Calder Books

Hi Dana, attached is invoice CB-1126 for November bookkeeping (1 to 30 November 2026): $1,100.00 as per our monthly agreement, due 14 December 2026. Hours used this month are listed on page 1. Thanks, Lee

If you send the same bill every month, read about recurring invoices.

Templates for deposit and final invoices

Deposit and final invoices need a sentence of context, because they relate to a larger job. A deposit email should say what the deposit secures and when work starts. A final invoice should say the job is complete, show what was already paid and state the balance. Both reduce the chance of the client paying the wrong figure.

Template 4: deposit before work starts

Subject: Deposit invoice for patio rebuild: $1,200.00

Hi Ana, as agreed in the quote, attached is a deposit invoice for $1,200.00 (25% of $4,800.00). Once it is paid we will order materials and confirm the start date of 7 December. Thanks, Rafael, Westgate Landscapes

Template 5: final invoice

Subject: Final invoice for patio rebuild, WL-0212

Hi Ana, the patio is finished, and invoice WL-0212 is attached. The job total is $4,800.00; with your $1,200.00 deposit taken off, the balance is $3,600.00, due 31 December 2026. Thanks for having us, Rafael

The deposit is $1,200.00 because 25% of $4,800.00 is $1,200.00, and $4,800.00 less $1,200.00 leaves $3,600.00. For how to set up the deposit itself, see deposit invoices explained.

Attachments and file names

Send the invoice as a PDF, one invoice per file, with a file name that says what it is without opening it. Many accounts teams save attachments straight into a folder or forward them to a processing system, so a name like “Invoice-2026-041-HarborLaneDesign.pdf” is far easier to handle than “scan003.pdf” or “final_v2.pdf”.

• Name format: Invoice, number, your business name, with hyphens instead of spaces.
• PDF, not Word: an editable file can be changed by mistake, and it may look different on another computer.
• One invoice per file: combining several invoices into one PDF often means only the first gets processed.
• Avoid zip files and download links: some mail filters block them, and links can expire before the invoice is approved.

The invoice generator, here with a design studio sample, makes a real PDF with selectable text, which suits systems that read invoice details automatically. If you want a copy in your own inbox, press Email me. Prefer a fixed layout? Browse the PDF invoice templates.

When to send and who to send it to

Send the invoice as soon as the work is done or the goods are delivered, since payment terms usually count from the invoice date. Australia’s business.gov.au suggests sending the invoice at the time your customer buys to encourage them to pay on time, and lists email among the usual ways to send one. Address it to whoever approves payment.

For businesses, that is often an accounts payable address, with your day to day contact copied in. For individuals, it is the person who booked you. If an invoice goes unanswered past its due date, switch to the reminder plan in how to follow up an unpaid invoice. Sending from WhizInvoice lets you see which invoices are still open, if you would rather not track them by hand.