Invoice email — 6 examples and a template

How to write an invoice email

If you’ve done the work, you deserve to get paid! To get your cash, you’ll need to send an invoice.

Of course, you can just send an invoice attached to an email, but this approach won’t win you many friends or get you paid faster. Instead, you should create an invoice email that includes everything you need to do to make payment as easy as possible but sets out your terms in strong language.

It’s 50% carrot, 50% stick, and 100% effective!

This finance-focused article outlines what you should say in an invoice email. You’ll learn essential tips to write the best invoice emails and provide 6 invoice business email templates and a template for you to use.

Let’s get paid!

What to say in an invoice email message

It’s all about the money in an invoice email, but we don’t mention that too much. In fact, all the financial details are included in the invoice, so there’s no need to mention money, provide account details, or add specific information about how you want to be paid.

An invoice email accompanies the invoice, providing context and clarity about your terms and conditions. It’s critical because evidence and anecdote show that many businesses aren’t settling invoices in time. If you’re a freelancer, this can leave you out of pocket – and that’s not acceptable. 

To ensure you’re paid on time, here are five points to ensure you’re never left unpaid.

1. Be polite and professional

First and foremost, be polite and professional. Your client will have some time to pay (in most cases, between 7 - 28 days), so there’s no need to be pushy or impolite at the start.

The tone of voice can be tricky to get right, so check out our examples to see how we’ve tackled the task.

2. Make paying the invoice as easy as possible

You’ll want to do everything possible to make it as easy as possible for people to pay you. To achieve this, you must include all information in your email (as well as your invoice).

So, be sure you’ve included everything, such as who you are, your company (if you have one), your address, bank account details, contact details, and the project you’re invoicing for. 

3. Be clear about when and how you expect payment

Companies can be tricky to pin down when it comes to payments. Does the payment deadline start from when the invoice was issued or opened?

The best approach is to set your deadline (in favorable terms). If you’re brave or bold enough, you can set out what happens when people don’t pay on time.

You can list late payment fees and penalties if you wish, but personally, we’d recommend saving the nuclear option until you need it.

4. Share your terms and conditions

Above we recommend that you don’t go into detail about late payment charges, which we stand by – but you can provide details to your terms and conditions.

You can add them to the bottom of the email, attach them, or send a link to your website. This is a less aggressive or confrontational approach, but it will ensure no misunderstandings.

5. Don’t forget to attach the invoice

Sounds stupid, doesn’t it? But it never hurts to double-check that you’ve attached the right (not last month’s or someone else’s) invoice!

What should an invoice email include?

A well-written invoice email should include all the necessary details to ensure timely payment. First, clearly state the amount due, the due date, and accepted payment methods. According to FreshBooks, invoices that include clear payment instructions are paid on time​. Be sure to provide the invoice number, a brief description of the services or products provided, and any attachments or links to the invoice document.

Always include a polite closing that invites the client to contact you with any questions.

Invoice email format

The invoice email format is likely familiar to you if you’ve ever sent a professional email for any other purpose. You start with a clear subject line, go into detail in the body, and provide a positive sign-off (which includes all your contact details).

Here’s a step-by-step breakdown of the invoice email format:

1. Invoice email subject line

Your invoice subject line should make it clear it’s an invoice. This makes it easy for the recipient to act (either by responding directly or passing it on).

It’s a good idea to include the invoice reference in the subject. Here are a few invoice email subject lines:

• Invoice (insert number) – (Company name)
• (Company name) – Invoice 
• Invoice (insert number) – Thanks for the prompt payment!

2. Invoice email body and message

When you send your invoice, you’ll need to ensure that the body copy explains who it’s from, the project or service delivered, and any other essential information. Here’s an example of a standard invoice body copy:

• Please find attached the invoice (number) from (company or person name). The invoice covers (services, goods, etc.).

Immediately the person receiving this knows what it’s about. Next, you’ll need to provide the context and set out terms.

• Please confirm that you have received the invoice. Our standard payment terms are 28 days. You can find details of our terms and conditions here (link or attachment).

Make it easier by including the invoice number if you have it. Each invoice should have a unique number for tracking purposes.

Sometimes the person who receives the invoice may have questions about it, so give them some options to contact you.

• If you’ve any questions about the invoice or need me to clarify anything, you can contact me at (insert details).

Do all this, and your invoice email will get results and ensure prompt payment. 

3. How to end an invoice email

You’ll want a positive sign-off here, but you can use this to your advantage. First, always remind the person you’re expecting prompt payment, or they may conveniently forget to process the invoice in time.

• I look forward to receiving payment and working with you in the future.

If you know the person or want to say more, then do so (it’s your email, after all). 

Finally, add a nice ending (kind regards, thanks, etc.) and include your signature.

It’s a good idea to check that your signature contains all the contact details the recipient may need. This means they’ve got no excuses for ignoring you. 

When is the best time to send an invoice?

Timing is crucial when it comes to sending invoices. The right timing can significantly impact how quickly you receive payments and maintain a healthy cash flow. Clearly outlining payment terms is essential to ensure clients are aware of their responsibilities regarding due dates. Here are some key considerations for determining the best time to send an invoice:

1. Immediately after delivery of goods or services: Sending an invoice as soon as the goods or services are delivered ensures that the transaction is fresh in the client’s mind. This practice can lead to faster payments and reduce the likelihood of disputes or forgotten invoices. It shows your professionalism and promptness, reinforcing the value you provide.
   
2. End of the billing cycle: For businesses that operate on a regular billing cycle, such as monthly or quarterly, sending invoices at the end of the cycle is standard practice. This method aligns with clients’ expectations and internal processes, making it easier for them to manage their finances and ensure timely payments.
   
3. Consistent schedule: Establishing a consistent invoicing schedule helps clients anticipate and prepare for payments. Whether it’s the first day of the month, every Friday, or another set day, consistency can improve the predictability of your cash flow and help clients manage their budgets more effectively.
   
4. Before month-end closures: Many businesses close their books at the end of the month. Sending invoices a few days before the month-end ensures that your invoice gets processed within the current accounting period. This practice can speed up payment as clients aim to settle outstanding amounts before closing their monthly accounts.
   
5. Project milestones: For project-based work, invoicing at the completion of significant milestones can be an effective strategy. This approach ties payments to the progress of the project, ensuring that you receive funds regularly as you advance through the project stages. It also provides clients with a clear understanding of what they are paying for at each step.
   
6. Client preferences: Understanding your client’s preferences and payment cycles can also influence the best time to send an invoice. Some clients may prefer receiving invoices at the beginning of the month, while others may prefer mid-month or end-of-month. Tailoring your invoicing schedule to fit your client’s needs can enhance your relationship and ensure timely payments.

By considering these factors, you can determine the optimal time to send invoices to your clients, thereby improving your chances of receiving timely payments and maintaining a steady cash flow. Using Outlook AI or Gmail AI can help automate and streamline your invoicing process, ensuring that your invoices are sent out at the best possible time.

Integrating these strategies into your invoicing practices will not only enhance your cash flow management but also foster better client relationships through clear and predictable billing practices.

When to send a follow-up on your invoice email

If payment hasn’t been made by the due date, it's time to send a follow-up email. It’s best to follow up within 1 to 3 days after the invoice’s due date, according to research, businesses who follow up promptly see a better payment rate​.

In some cases, late payment penalties can encourage clients to pay on time.

If there’s no response after the first follow-up, you can send another polite reminder 7 days later. The key is to remain professional and courteous while making it clear that payment is expected.

10 Pro tips for sending invoice emails

Sending invoice emails is more than just attaching a document and hitting send. To ensure your invoices are clear, professional, and prompt payment, consider the following tips:

1. Clear subject line: The subject line should be straightforward and informative. Include the word “Invoice,” the invoice number, and the client’s name or project name. For example, “Invoice #12345 for [Client Name/Project]”. This helps the recipient quickly identify the purpose of the email. A clear and descriptive invoice email subject line ensures that recipients easily recognize the content as an invoice, facilitating prompt actions.
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2. Personalize your message: Personalization can make a big difference. Address the recipient by their name and include specific details about the service or product provided. A personalized message shows that you value the client and their business.
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3. Include all necessary details: Make sure your email body includes all critical information such as the invoice number, date, amount due, due date, and a brief description of the goods or services provided. This helps avoid any confusion and speeds up the payment process.
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4. Attach the invoice in a common format: Attach the invoice in a widely accepted format such as PDF. This ensures that the document can be opened and viewed on any device. Double-check the attachment to make sure it is correct and not corrupted.
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5. Provide payment instructions: Clearly state the payment methods you accept and provide detailed instructions if necessary. Include your bank details, PayPal information, or any other payment method you use. The easier it is for the client to pay, the quicker you will receive your money.
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6. Set a professional tone: Maintain a professional and courteous tone throughout the email. Thank the client for their business and prompt payment. A polite email reflects well on your business and helps in maintaining a positive relationship.
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7. Follow up on overdue invoices: If the payment is overdue, send a follow-up reminder promptly. Be polite but firm, reminding the client of the overdue amount and the terms of payment. Consistent follow-up demonstrates your seriousness about getting paid.
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8. Use an invoicing software or AI tool: Consider using invoicing software or an AI tool like ChatGPT for Outlook. These tools can help automate the invoicing process, send reminders, and keep track of payments, making your job easier and more efficient.
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9. Proofread before sending: Always proofread your email and attachment before sending. Check for any spelling or grammatical errors, and ensure all the information is correct. A well-written, error-free email looks more professional and is more likely to get a timely response.
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10. Include a call to action: End your email with a clear call to action. For instance, “Please review the attached invoice and process the payment by [due date].” A specific request directs the client’s attention to what you need them to do next.

By following these tips, you can enhance the effectiveness of your invoice emails, ensuring they are clear, professional, and prompt clients to pay on time. These practices will not only improve your cash flow but also strengthen your business relationships.

6 invoice email examples

It’s time to get writing! Here are 6 invoice email examples that you can use to push for payment.

Classic phrases such as “please find attached invoice for your payment” are used a lot.

It’s not that we’re lazy; invoice emails follow a traditional format, and using familiar words and phrases is how the world works.

OK, so let’s get the money moving…

1. Simple invoice email sample

This simple template for sending an invoice to a client or customer follows the outline above. It’s short, sweet, and straight to the point. 

2. Past due invoice email sample

You can call your invoice late, outstanding, or unpaid. Whatever you call it, you deserve to get paid – and we can help.

This past-due invoice email sample is a clear and confident message that will move someone to pay your invoice.

As well as acting as a reminder, this sets out what happens if the invoice isn’t paid. (Carrot and stick, remember?)

3. Unpaid invoice reminder email sample

This example email to remind you about an unpaid invoice is a little softer than the previous sample.

Sometimes, the person may have a legitimate excuse for not paying on time. This outstanding invoice reminder sample gives them a way to save face, but they’ll know you’re not going to forget!

As with the previous example, consider sending it with a new subject line to ensure it’s not ignored.

4. Invoice follow-up email sample

This invoice follow-up sample is a gentle reminder that your invoice is due for payment. Of course, you can wait until it’s not been paid, but if you’re working with a habitual late payer, send it a few days before it’s due.

This payment due (or overdue) invoice template provides a gentle reminder that you’re owed money and will collect it!

5. Paid invoice email sample

According to professional conventions, some suggest sending a confirmation email when you’ve paid an invoice to protect you from potential legal issues.

This serves two essential functions:

1. Your recipient knows to expect payment and doesn’t have to remind or follow up on you (or anxiously wait for you to confirm your payment)
2. Your recipient has been informed that you handled the payment on time and before the due date, just in case your payment does not go through, or other problems arise

To make sure you comply with deadlines and prevent potential issues, use this short paid invoice email template:

6. Invoice approval email sample

If you’ve commissioned work or purchased a product, sending a confirmation when you receive an invoice that it’s been approved for payment is polite.

This provides your finance person or team with the OK to arrange payment. We recommend doing this as soon as you receive an email, or you could be one of those annoying customers that keep freelancers waiting for their cash. Don’t be this person.

Why use an invoice email template?

Using an invoice email template helps ensure consistency and professionalism in your communications. It saves time by providing a pre-structured format, allowing you to quickly fill in the necessary details like the invoice amount, due date, and services provided.

Based on survey, nearly 70% of businesses that use templates and automations improve efficiency and eliminate human-errors​. Templates also help maintain a consistent tone and style, making your communications look polished while reducing the time spent drafting from scratch.

Need to write a professional invoice email? Try MailMaestro for free!

MailMaestro can help you draft a professional invoice emails in a matter of seconds. One of our standout features is the Improve existing email option. You can input your draft and MailMaestro's AI email assistant will refine it, making it more professional, concise, and compelling. See how it works below.

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Proven invoice email template

The above examples should provide enough ammunition to develop your own, but we’ve stripped out all context and creativity for this tried and tested invoice template.

So follow the structure, fill in the gaps, and send to finance for prompt payment.

Final words

When deciding how to write an invoice email, think about the carrot and the stick. You’ll want to be polite and professional, but never let yourself be pushed around.

When sending an invoice via email, set out your terms and stick to them. Your message should include a brief description of the work completed. Customers will respect you if you’re pushing for what you’re owed.

We hope the samples and templates here are helpful. To write a perfect invoice email, try our AI email assistant, MailMaestro. It will write messages for you from scratch based on your conversation's context or will improve your existing drafts using the power of AI.