The invoice itself says what a client owes. The email it travels in decides whether they read it today or next week. A good invoice email is short, specific and makes paying easy. A vague one ("Hi, see attached") gets buried.
Below you'll find a simple structure, subject lines that get opened, and five copy-paste invoice email templates for the situations freelancers run into most.
Key takeaways
Use a clear subject line: "Invoice," the invoice number, your name and the due date.
Keep the body to five lines or fewer: greeting, what the invoice is for, amount and due date, how to pay, thank-you.
Always repeat the amount and due date in the email, even though they're on the invoice.
Attach a PDF, include a payment link, or both.
Send it to the person who actually pays invoices, and copy your main contact if needed.
Email vs. invoice: what goes where
The email and the invoice do different jobs.
The invoice is the formal record: your details, the client's details, invoice number, dates, line items, totals and payment details. If you're not sure what belongs on it, see our step-by-step guide on how to make an invoice.
The email is the delivery note. It points to the invoice, highlights the essentials and tells the client what to do next.
Don't paste the whole invoice into the email body. Summarize the key facts and let the attachment or link carry the detail.
How to write an invoice email, step by step
1. Write a subject line they can't misread
Your subject line should answer "what is this and when is it due?" before the client opens the email.
Formula: Invoice #[number] from [Your name/business] – due [date]
Examples:
Invoice #0042 from Jane Doe Design – due Oct 30
Invoice #2026-015 for September copywriting – due Oct 15
[Project name]: Invoice #0108 (Net 15)
Avoid vague subjects like "Quick note," "Following up" or "Important." They're easy to skip and hard to search for later.
2. Address the right person by name
Use your client's name, not "To whom it may concern." If a different person or department pays invoices (often "accounts payable" at larger companies), send it to them and copy your main contact. Ask about this before your first invoice, along with whether they need a purchase order (PO) number on it.
3. Say what the invoice is for
One sentence is enough: the invoice number and the work it covers. "Please find attached invoice #0042 for the homepage redesign we wrapped up last week." This helps the client match the invoice to the project and approve it quickly.
4. State the amount and the due date
Repeat both in the body, even though they're on the invoice. Many clients read the email and nothing else until they sit down to pay. Write an actual date ("due October 30, 2026") rather than only "Net 30."
5. Explain how to pay
Tell them the fastest way to pay. If you accept cards, include the payment link. If you take bank transfers, say the details are on the invoice. The fewer steps it takes, the sooner you get paid. If you take card payments, our Stripe fee calculator shows what you'll actually receive after fees.
6. Close with thanks and an offer to help
A short thank-you and "let me know if you have any questions" keeps the tone friendly and gives the client an easy way to flag a problem early, rather than quietly delaying payment.
7. Attach the invoice or add a link
Send the invoice as a PDF (not an editable Word or spreadsheet file) or as a link the client can open in a browser. Name the PDF clearly, for example "Invoice-0042-JaneDoeDesign.pdf." Then do a final check: right client, right amount, right attachment.
5 invoice email templates
Copy these, replace the bracketed parts and adjust the tone to match your relationship with the client.
Template 1: Standard invoice email
Use this for most invoices to existing clients.
Subject: Invoice #[number] from [Your business] – due [date]
Hi [Client name],
Please find attached invoice #[number] for [project or service], covering [dates or milestone].
The total is [amount], due by [due date]. You can pay by [card via the link below / bank transfer using the details on the invoice].
[Payment link]
Thanks again for the work together. Let me know if you have any questions.
Best,
[Your name]
[Business name] · [email] · [phone]
Template 2: First invoice to a new client
The first invoice sets expectations. Be a bit more explicit about how you bill and how payment works.
Subject: Invoice #[number] for [project] – due [date]
Hi [Client name],
Thanks again for choosing me for [project]. It's been great working with you so far.
Attached is invoice #[number] for [what it covers]. Here's a quick summary:
Amount due: [amount]
Due date: [date] ([payment terms, e.g. Net 15])
How to pay: [card via link / bank transfer – details on the invoice]
If invoices should go to someone else on your team, or you need a PO number on them, just let me know and I'll update it.
Best regards,
[Your name]
Template 3: Recurring or retainer invoice
For monthly retainers or ongoing work, keep it brief and consistent so it's easy to approve every month.
Subject: [Month] invoice #[number] – [Your business]
Hi [Client name],
Here's the invoice for [month]'s [retainer/service], invoice #[number].
This month included:
[Deliverable or hours 1]
[Deliverable or hours 2]
The total is [amount], due on [date]. Payment details are on the invoice as usual.
Thanks, and looking forward to next month.
[Your name]
Template 4: Deposit or upfront invoice
Use this when you bill part of the fee before you start. Make it clear that the start date depends on payment.
Subject: Deposit invoice #[number] for [project] – due [date]
Hi [Client name],
As agreed, here's the deposit invoice for [project]: [percentage]% of the total fee, [amount].
Once the deposit is paid, I'll get started on [first milestone], with delivery planned for [date]. The remaining balance of [amount] will be invoiced on [delivery / milestone].
You can pay here: [payment link], or by bank transfer using the details on the attached invoice.
Looking forward to getting started!
[Your name]
Template 5: Short, casual invoice email
For long-standing clients who just need the facts.
Subject: Invoice #[number] – [project]
Hi [Client name],
Invoice #[number] for [project] is attached: [amount], due [date]. Pay link: [link].
Thanks!
[Your name]
Invoice email mistakes to avoid
No amount or due date in the email. The client has to open the attachment to find out what they owe. Many won't until later.
Sending to the wrong person. Your project contact may not be able to pay. Ask who handles invoices.
Attaching an editable file. Send a PDF or a link so numbers can't be changed by accident.
Missing payment details. "Let me know how you'd like to pay" adds a round of emails. Say how.
A long, apologetic message. You don't need to justify sending an invoice. Keep it short and friendly.
Forgetting the invoice number. It's how both of you will refer to the payment later.
For more ways to get paid faster, see our invoicing tips.
When the invoice email gets no reply
Silence usually means the invoice is buried, not refused. A good rhythm:
A few days before the due date: a short, friendly heads-up.
Right after the due date: a polite reminder with the invoice attached again.
One to two weeks overdue: a firmer follow-up, and possibly a phone call.
You'll find ready-to-use wording in our friendly reminder email templates, and the full escalation process in how to remind someone to pay you. If your contract includes a late fee, the late fee calculator works out the amount.
Send invoices without writing the email from scratch
If you invoice regularly, an invoicing tool saves you from rebuilding the same email every time. In Onigiri you can send an invoice by email to several recipients at once (handy when your contact and accounts payable both need it), share it as a link, or download it as a PDF. On the PRO plan, clients can pay by card, Apple Pay or Google Pay right from the invoice, and it's marked Paid automatically. Start for free; the free plan includes 3 invoices a month.
Just need a one-off PDF to attach? Use the free invoice generator or start from a freelance invoice template.
