How to Write an Invoice Email That Gets You Paid Fast

Ever sent an invoice and then waited weeks for payment, wondering if it got lost in someone’s inbox? It can happen for a number of reasons, but a good invoice email can help you avoid limbo.

Some people craft their invoices with care, but treat the email like an afterthought. That’s a mistake. Clear and well-crafted emails can contribute to a smooth payment process.

When you learn how to write an invoice email, you can transform awkward money conversations into professional exchanges that keep cash flowing and relationships thriving. Read on for helpful templates and best practices on how to write an invoice email that will get you paid on time.

The anatomy of a professional invoice email

All good invoice emails share certain elements, starting with a clear and informative subject line and ending with a professional signature.

Key components to include in every invoice email

Wondering how to write an invoice email? You’ll want to make sure all these crucial details are covered:

• Clear, professional subject line to catch the client’s attention
• Proper client greeting and personalization that treats each client as an individual
• Brief description of work completed or goods delivered, so the payment request is attached to the value delivered
• Invoice number and payment terms to make records and transactions easy
• Call-to-action for payment to indicate the next step
• Professional closing and contact information, so the client can reach out with any issues or questions

How to address a client when sending an invoice via email

Tailor your greeting to each client. If you’re on a first-name basis during project calls, don’t suddenly switch to “Dear Mr. Thompson” in invoices. When in doubt, mirror how your clients address you. If they email you as “Hi Jennifer,” respond with the same casual tone.

New clients need more context and formality until you build rapport. With established relationships, you can briefly mention shared experiences or wins, continuing to build lasting business relationships.

If you work with clients in other countries, brush up on your international business etiquette. Clients from more hierarchical cultures may prefer formal titles and indirect language around payment requests.

Writing your invoice email: Step-by-step guide

Your invoice email needs to cut through inbox clutter. Here’s how to write an invoice email that gets opened, read, and acted upon.

Crafting the perfect subject line

Make it easy for your client to identify the invoice. Follow these best practices for invoice subject lines:

• Use clear, direct language.
• Include the invoice number and project/service title.
• Add the due date.
• Avoid spam triggers. Invoice fraud is on the rise, and email providers are on high alert.

What to write in an email when sending an invoice

Make sure it’s clear what specific products or services you’re invoicing for. A line such as “I’m attaching my invoice for September marketing services” keeps everyone on the same page. Be sure to include accepted payment methods and your contact information.

Essential elements for timely payment

In a 2023 QuickBooks survey, more than 70% of small businesses suffered as a result of late invoice payments. Here’s how to avoid them and the related cash flow difficulties.

Payment terms and due dates: Why they matter

Clear payment terms reinforce the agreement between you and your client and eliminate confusion and guesswork. Including a due date makes it eight times more likely that the invoice will be paid on time, and realistic but firm deadlines signal that you take your business seriously.

Documenting your terms also provides a written record, which can be valuable if you need to address disputes or late payments.

What should be included in an invoice email to ensure timely payment

Your email should also mention your late payment policy, payment methods, and contact information. A simple line like, “A late fee of 1.5% may be applied to payments received after 30 days,” sets clear boundaries.

You also need to be available. Don’t make people work too hard to pay or contact you. Indicate all your available channels and accounts. Provide your phone number, email address, and user name for Venmo, PayPal, or any other services you use.

Invoice email templates that work

If you’re still unsure how to write an invoice email that wins every time, take advantage of invoice email templates.

Why use an invoice email template?

An email template helps make your billing process smoother, building trust with clients through a consistent communication style.

Every invoice you send should look professional and include all the necessary information. A template reduces the risk of errors that could delay payment.

For busy business owners, templates are a huge time-saver. You can send invoices in just a few minutes, which frees you up to focus on other work.

Invoice email templates for common situations

Read on for invoice email templates you can use in different situations. Just remember to adapt them to your brand; that might mean adding your logo at the top and adjusting the wording to fit your voice.

New client invoice email template

This template should be more formal. It needs to clearly outline your payment terms and methods.

Subject: Invoice #[INVOICE NUMBER] for [SERVICE/PRODUCT DESCRIPTION] — Due [DUE DATE]

Email Body:

Dear [CLIENT NAME],

Thank you for choosing [YOUR COMPANY NAME] for your [PROJECT/SERVICE]. We enjoyed working with you on [BRIEF PROJECT DESCRIPTION].

Please find attached Invoice #[INVOICE NUMBER] for [SERVICE/PRODUCT DELIVERED]. This invoice covers [BRIEF DESCRIPTION OF WORK COMPLETED].

Invoice Details:

• Invoice Number: [INVOICE NUMBER]
• Amount Due: $[AMOUNT]
• Payment Due Date: [DUE DATE]

Payment Options:
You can pay this invoice using any of the following methods:

• [PAYMENT METHODS AND LINKS]

Payment is due within [NUMBER] days of the invoice date. If you have any questions about this invoice, please contact me at [CONTACT INFO].

Hope this finds you well!

Best regards,
[YOUR NAME]
[YOUR TITLE]
[CONTACT INFORMATION]

Recurring service invoice template

For ongoing work, you can tweak the body of the email. The client knows your payment procedures, so a quick, friendly note is usually enough.

Email Body:

Hi [CLIENT NAME],

Hope things are going well! Here’s your invoice for [MONTH/SERVICE PERIOD].

Invoice #[INVOICE NUMBER] is attached for $[AMOUNT], covering [SERVICE DESCRIPTION] for [TIME PERIOD]. Payment is due by [DUE DATE] as usual.

You can pay through your regular method or use our online portal: [PAYMENT LINK]

Thank you for choosing us. Let me know if you need anything!

Product delivery invoice template

When sending an invoice for a product, the template should confirm delivery, connecting the request to the value received.

Subject: Your [PRODUCT NAME] has been delivered – Invoice #[INVOICE NUMBER]

Email Body:

Hi [CLIENT NAME],

Great news! Your [PRODUCT NAME] has been [delivered/sent/made available for download].

[DELIVERY CONFIRMATION DETAILS – tracking number, download link, or delivery date]

Please find attached Invoice #[INVOICE NUMBER] for $[AMOUNT]. Now that you’ve received your [PRODUCT], payment is due within [NUMBER] days.

• [PAYMENT METHODS AND LINKS]

If you have any issues with your [PRODUCT] or questions about payment, just reply to this email.

Thanks for your business!

[YOUR NAME]
[CONTACT INFORMATION]

Milestone payment invoice template

In the body of the email, refer to the milestone that has been completed to justify the invoice and keep the project on track.

Email Body:

Hi [CLIENT NAME],

We’ve successfully completed [MILESTONE DESCRIPTION], which means we’re [PERCENTAGE]% through the project.

Please find attached Invoice #[INVOICE NUMBER] for $[AMOUNT], representing the agreed-upon payment.

Payment is due within [NUMBER] days. 

• [PAYMENT METHODS AND LINKS]

The next milestone, [NEXT MILESTONE NAME], is scheduled for [DATE/TIMEFRAME]. I’ll keep you updated on our progress.

Any questions about this invoice or the project? Just hit reply.

Rush payment template for urgent situations

Be polite but direct about timing needs. Offer expedited payment methods if available.

Subject: URGENT: Invoice #[NUMBER] – Payment needed by [DEADLINE]

Email Body:

Hi {{Client Name}},

I hope this finds you well. I need to ask for your help with something time-sensitive.

Due to our business costs, we need you to pay your invoice by [DEADLINE].

Invoice Details:

• Invoice #[NUMBER]
• Amount: $[AMOUNT]
• Payment needed by: [DATE]

Fast Payment Options:

• [EXPEDITED PAYMENT METHODS AND LINKS]

I know this is short notice, and I really appreciate your understanding. If you can’t make the deadline work, please let me know right away so we can figure out alternatives.

Questions or issues? Call me directly at [PHONE NUMBER] or reply to this email.

Thanks for being so reliable and understanding!

Follow-up template for overdue invoices

Stay professional while creating gentle pressure. Include the original invoice and clear next steps.

Subject: Friendly reminder: Invoice #[NUMBER] – Payment due [NUMBER] days ago

Email Body:

Hi [NAME],

Hope you’re doing well! I wanted to follow up on Invoice #[NUMBER] for $[AMOUNT], which was due on [DATE].

I know things get busy, so I’ve attached the original invoice again for your convenience.

Invoice Summary:

• Invoice #[NUMBER]
• Amount: $[AMOUNT]
• Original due date: [DEADLINE]
• Days overdue: [NUMBER OF DAYS]

Payment Options:

• PAYMENT METHODS AND LINKS]

If there’s an issue with the invoice or you need different payment arrangements, let’s talk. I’m here to work with you and find a solution that works.

What happens next?
If we don’t hear from you within [NUMBER] days, we’ll need to [ENFORCE THE ESTABLISHED LATE PENALTY] and may need to pause future work until this gets resolved.

Thanks for being a valued client. Looking forward to hearing from you soon!

Following up on your invoice emails

Even your best clients can overlook an invoice in the daily rush. Sending email reminders isn’t pushy — it’s a way to keep your cash flow steady and ensure payments don’t fall through the cracks. Be persistent and professional, treating follow-ups as a normal part of doing business.

How to follow up on your invoice email

Following up on unpaid invoices requires balance and good timing. You need to be firm about payment while keeping the client relationship intact.

When emails don’t work, you may need to make a quick phone call to clear up confusion.

How to follow up on an unpaid invoice through email

Give the client the benefit of the doubt at first.

Start with a friendly reminder a day or two after the due date. If necessary, a second follow-up a week later can be more direct, reattaching the original invoice.

Your final notice should outline the consequences of non-payment. If the invoice remains unpaid, consider using a collections service or seeking legal advice to get what you are owed.

The power of integration: Connecting your bookkeeping and email marketing

Beyond using templates, you can integrate your accounting and email marketing software to make the entire payment process faster and more convenient. Automated invoice emails relieve you from the burden of manual work, so you can focus on what matters most for your business: delivering stellar services and experiences.

Constant Contact and Xero recently announced a new integration that makes it easy to automate invoices and follow-ups. “Automation empowers business owners to strengthen their financial position and reclaim valuable hours spent on manual admin, allowing them to focus on running their business, not their books,” says Bharathi Ramavarjula, SVP of Payments at Xero.

Why integrating your bookkeeping and email marketing software matters

There’s no need to play data entry ping-pong between different platforms and waste time and effort. Set up sales and marketing automations and let customer information flow seamlessly from campaigns to invoices and back again. Use sales data to personalize marketing messages and marketing tools to add branding and design elements to transactional emails.

How modern integrations transform your invoice process

With email and digital marketing integrations, you can track and tweak every part of the invoice process. See when customers open your invoices, which payment methods get used most, and the best days to send payment reminders.

Transform your cash flow with better invoice emails

Getting paid shouldn’t feel like pulling teeth. When you learn how to write an invoice email, you can accelerate your cash flow and improve your bottom line.

Ready to transform more than just your invoice emails? Sign up for a free trial of Constant Contact email marketing software and build email lists that grow your business. Turn one-time buyers into loyal customers who pay on time, every time.

Your cash flow transformation starts with better communication — so make every email count.