Invoice Email Templates: What to Write When You Send an Invoice

The invoice is done. The work is delivered. Now you have to write the email that sends it — and somehow that blank message field is where a lot of freelancers freeze. Too casual and you look unprofessional. Too stiff and you sound like a debt collector before the bill is even late.

Here is the thing most people get wrong: the email that accompanies an invoice is not a formality. It is the difference between getting paid in three days and getting paid in three weeks. A clear subject line gets the invoice opened. A short, friendly body with a payment link gets it paid. A vague "please find attached" buried in a long paragraph gets it forgotten.

This guide gives you seven copy-paste invoice email templates for every situation you will actually run into — your first invoice with a new client, a deposit request, a standard invoice, recurring work, and the final invoice on a project. Each one is short on purpose. Swap in the brackets, hit send, get paid.

What Every Invoice Email Needs

Before the templates, the five elements that every good invoice email shares. Miss any of these and you create friction — and friction is what delays payment.

Element	Why it matters
A specific subject line	"Invoice #INV-001 from [Your Business]" gets opened. "Invoice" alone gets lost.
The invoice number and amount	The client should know what they owe without opening the attachment.
A payment link	Every extra step between reading and paying costs you days. One click is the goal.
The due date in words	"Due July 21" is clearer than "net 30" to a non-accountant.
A friendly, human sign-off	You are a person they want to work with again, not an automated system.

Attach the PDF and include a payment link. Some clients forward the PDF to their accounts team; others pay on their phone in ten seconds from the link. Give both audiences what they need in the same email.

Template 1: Sending a Standard Invoice

Your everyday workhorse. Use this for any invoice to an existing client who already knows your rates and your work. Keep it short — they have seen invoices from you before.

Subject line: Invoice #INV-001 from [Your Business Name]

Hi [Client Name],

Please find invoice #INV-001 for $2,500.00 attached, covering [brief description of the work — e.g. "design work for the June campaign"].

You can view and pay it online here: [Payment Link]

Amount due: $2,500.00 Due date: July 21, 2026

Thanks again for the work — it was a pleasure. Let me know if you have any questions about the invoice.

Best, [Your Name] [Your Business Name]

Template 2: Your First Invoice to a New Client

The first invoice sets the tone for the whole relationship. Be a little warmer, and spell out the payment options clearly — the client has never paid you before and may not know how you prefer to be paid.

Subject line: Invoice #INV-001 from [Your Business] — payment details inside

Hi [Client Name],

It was great working with you on [project name]. Attached is my first invoice, #INV-001, for $2,500.00.

Here is everything you need to pay it:

Amount due: $2,500.00

Due date: July 21, 2026 (net 30)

Pay online: [Payment Link]

Bank transfer: details are on the invoice if you prefer

If your team needs anything for your records — a PO number, a W-9, a different billing address — just let me know and I will sort it out right away.

Looking forward to working together again.

Warm regards, [Your Name] [Your Business Name]

On a first invoice, ask once whether the client needs anything for their records. Catching a missing PO number or tax form now prevents the "we can't pay this until it has X" delay later.

Template 3: Requesting a Deposit or Upfront Payment

For larger projects, a deposit protects you and signals commitment from the client. The key is to frame it as a normal, professional step — because it is.

Subject line: Deposit invoice #INV-001 to get started on [Project Name]

Hi [Client Name],

Excited to get started on [project name]! As we discussed, I work with a 50% deposit to begin, with the balance due on completion.

Attached is deposit invoice #INV-001 for $1,250.00.

Amount due: $1,250.00

Pay online: [Payment Link]

Once the deposit comes through, I will block out your start date and get going. The final invoice for the remaining balance will follow when the work is delivered.

Thanks so much — let me know if you have any questions.

Best, [Your Name] [Your Business Name]

Template 4: Final Invoice at the End of a Project

The work is done and you want a clean, satisfying close. Acknowledge the finish, restate what is owed, and make paying effortless.

Subject line: Final invoice #INV-004 for [Project Name]

Hi [Client Name],

That is a wrap on [project name] — thank you for a great project. Attached is the final invoice, #INV-004, for $1,250.00 (the remaining balance after your deposit).

Amount due: $1,250.00

Due date: July 21, 2026

Pay online: [Payment Link]

It has been a real pleasure working with you. If you ever need [your service] again, I would love to help — and a referral is always appreciated.

All the best, [Your Name] [Your Business Name]

The final invoice is the perfect moment to ask for the next thing: a testimonial, a referral, or a follow-on project. The client is happy and the work is fresh in their mind — never let that moment pass in silence.

Template 5: Recurring or Monthly Retainer Invoice

For ongoing clients on a retainer, the email should be predictable and low-effort. They expect it; do not over-explain. Consistency here builds trust.

Subject line: Invoice #INV-007 — [Month] retainer

Hi [Client Name],

Here is your invoice for July — #INV-007 for $2,000.00, covering this month's retainer.

Amount due: $2,000.00

Due date: July 21, 2026

Pay online: [Payment Link]

A quick summary of what we covered this month is on the invoice. As always, thanks for the continued partnership — let me know if you would like to adjust scope for next month.

Best, [Your Name] [Your Business Name]

Retainer invoices are the easiest to automate. Set them to send on the same day every month so the client comes to expect them — predictable billing gets paid faster and reduces awkward back-and-forth.

Template 6: Resending an Invoice the Client Missed

Not late yet — just unacknowledged. Maybe it landed in spam, maybe it got buried. Give them the benefit of the doubt with a light, no-pressure nudge.

Subject line: Re-sending invoice #INV-001 (in case it got lost)

Hi [Client Name],

I wanted to make sure this reached you — I sent invoice #INV-001 for $2,500.00 on [date], but I know inboxes get busy and things slip through.

Re-attaching it here, and you can pay online in a couple of clicks: [Payment Link]

No rush at all — just flagging it so it does not fall off your radar. Let me know if you need anything from me.

Thanks, [Your Name] [Your Business Name]

If an invoice is genuinely overdue rather than just missed, switch to a proper reminder sequence with escalating tone. We cover exactly what to send and when in Late Payment Email Templates That Actually Get You Paid.

Template 7: Invoice With a Discount or Thank-You

Reward early payment, loyalty, or a referral with a small discount — and make sure the client feels the goodwill. It is cheap marketing that gets you paid faster.

Subject line: Invoice #INV-001 — with a thank-you discount

Hi [Client Name],

Attached is invoice #INV-001. Because you [referred a new client / have been with me a full year / paid early last time], I have applied a 10% loyalty discount — the total comes to $2,250.00 instead of $2,500.00.

Amount due: $2,250.00

Due date: July 21, 2026

Pay online: [Payment Link]

Just a small thank-you for being a great client. I appreciate you.

Best, [Your Name] [Your Business Name]

Subject Lines That Actually Get Opened

The body does not matter if the email never gets opened. Strong invoice subject lines are specific and include your business name and the invoice number, so the client can find them again later:

✅ Invoice #INV-001 from [Your Business Name]
✅ Invoice #INV-001 — $2,500.00 due July 21
✅ [Your Business] invoice for [Project Name]
❌ Invoice
❌ Payment
❌ Following up

Include the invoice number in the subject line every time. When a client searches their inbox three weeks later to pay you, "#INV-001" is what they will type — make sure your email is what comes up.

Stop Writing Invoice Emails From Scratch

Templates are a great start, but copy-pasting and editing brackets for every invoice still eats time — and it is easy to send the wrong amount or forget the payment link. This is exactly what invoicing software is for.

With KipBill, every invoice you send goes out with a professional, branded email automatically — the right amount, a one-click payment link, and a clean PDF, in any of 12 languages. You can:

Send invoices by email in one click, with the payment link built in
See when a client opens the invoice so you know it landed
Set up recurring invoices that send themselves every month
Accept payment online via Stripe, straight from the email
Send automatic reminders if an invoice goes unpaid

You can create your first invoice for free — no credit card, no trial limit on the core features. Or grab a free invoice template if you just need to send one quickly.

Frequently Asked Questions

What should I write in an email when sending an invoice?

Keep it short: greet the client, state the invoice number and amount, give the due date and a payment link, and close warmly. Three or four sentences is plenty. The goal is to make paying effortless, not to explain the work again — that belongs on the invoice itself.

Should I attach the invoice as a PDF or just send a link?

Both. Attach the PDF for clients who forward it to an accounts team, and include a payment link for clients who want to pay immediately from their phone. Giving people both options removes the most common reason invoices sit unpaid.

What is a good subject line for an invoice email?

Use your business name and the invoice number: "Invoice #INV-001 from [Your Business Name]." Adding the amount and due date — "Invoice #INV-001 — $2,500.00 due July 21" — works even better. Avoid one-word subjects like "Invoice," which are easy to lose.

How do I ask for payment without sounding pushy?

When you are sending the invoice (not chasing a late one), there is nothing pushy about it — you delivered work and you are billing for it. Stay friendly and factual, include a payment link, and thank them. If the invoice later becomes overdue, move to a dedicated reminder sequence that escalates politely over time.

Can I automate invoice emails?

Yes. Invoicing tools like KipBill send the invoice email for you the moment you hit send, with your branding, the payment link, and the PDF included — and they can send recurring invoices and overdue reminders automatically, so you stop writing these emails by hand entirely.