Late payments can be caused by several factors, including poor follow-up, a lack of communication, overdue invoice letter, sloppy invoice creation, delayed invoice delivery, an unreliable invoice format, and poor printing.

Due to a lack of cash flow and overdue invoice letters, these types of issues can push a small business into debt. An effective solution to avoid this is to employ an Invoice letter. As a result, regardless of size or industry, creating an appropriate invoice letter for payment is critical for any business.

According to ShareSpace research, 11% of customers never receive the correct invoice. Thus it is critical for your business to create and distribute invoice letters to ensure that your clients and their accounts payable department receive and process invoices in a timely manner.

Now, let us take you through what invoice letters and payment letters are, how to invoice immediately, and how to write a winning invoice letter for your business.

What is an Invoice Letter?

An invoice letter is a type of standard business letter and a financial document that is sent together with an invoice and contains payment details about the invoice as well as a request for payment from the client. It is sent with an invoice, thus the term “invoice letter.”

It is a method of demanding that the recipient do the required job before the deadline. Many businesses email clients and issue invoice letters in several conditions. The payment request letter must be formal and well-written.

A proper invoice letter or overdue invoice letter for payment can assist you in keeping track of past due amounts and maintaining your financial security.

What is a Payment Letter?

A payment letter, also known as a letter of payment or evidence of payment letter, is a document that describes the specifics of a financial transaction. This standard business letter is frequently accompanied by a cheque. It is written to assure payment or to provide payment details. To notify the receiver to receive payments, the amount, purpose, and sender are all explicitly indicated.

The invoice number and date the payment was made are also provided. The bank may occasionally provide it to a customer to reassure them that the payment will be completed by a specific date. To formalize loan repayment agreements, lenders and borrowers may exchange payment letters.

Even though the primary text is different, the letter structure is the same as an invoice letter. On the other hand, the receiver of these goods or services sends the payment letters. In the invoice letter and payment letter, the terms “invoice details” and “payment details” are used.

Who Needs to Use Invoice & Payment Letter and Why?

Invoice and payment letters are tools used by the business and customers to keep a smooth business flow. Businesses must issue invoice letters to ensure customer payment. These function as enforceable contracts between a firm and its consumers since they serve as documentation of the goods or services that are given as well as the amount still owed.

Because invoice letters along with the invoice attached, contain critical information about how your sales change over time, they may be utilized to build reliable business projections. Similarly, payment letters also act as proof of payment made for the client.

Format of Writing an Effective Invoice Letter and Payment Letter

Now that you understand why creating a winning invoice letter and payment letter is vital for any business, let us look at how you can create one from a blank document for yours.

Use a Template

Using an invoice business letter template will help you save time and enhance your chances of writing and delivering a relevant message. When you create and save the invoice letter template ahead of time, you may choose the critical triggering points and a recipient address add all of the necessary information. It may take a long time to draft separate letters for each customer and scenario, and many critical details may be overlooked. Thus to create a winning invoice letter every time, invoice letter templates are a must. It will remove the chance of any overdue invoice letter or late fees involved.

Fill up the Address

If you print all of your letters on letterhead, you may skip this step completely. If not, adding the full address to a common template and using it for all mailings would be straightforward. Start with your name, the name of your business, and your complete address if you don’t have a letterhead. The content that follows must also be left-aligned on your invoice template.

Standard address format:

  • Insert Client Name and Personal Title
  • Company name and company logo
  • Street Address
  • City, State, and Zip Code

Include the Date

If you write the physical letter across many days, include the date the invoice was written or finalized. After you’ve finished the address, write the date on one line You can ideally use the American date format for your invoice letter templates.

Include the Recipient’s Address

Include the recipient address after the date on your invoice letter templates and payment details letter. Add the street address, city, state, and, if applicable, zip code. Here, it is best to use a specific name.

Contact your client if you have any issues regarding who will be responsible for paying what sum, to whom your invoice should be addressed, or who, if anybody, you should copy on the invoice. On the invoice letter, provide the recipient address and name of the primary person making payments.

Add a Salutation

The time has come when the letter is read by one of the parties. Fill in the recipient’s name and standard personal title precisely to convey respect. The recipient’s address should be followed by an introduction. You may use the receiver’s first name only if you are acquainted with them. Begin the letter with a greeting and the same name as on the envelope.

Write the Body of the Letter

The letter body should contain all important information like project name payment terms, the last date to submit payment, specific project details, contact details, sales invoice details, any discounts from the business owner for the necessary transaction, etc in the first paragraph. Use a billing letter template to avoid overlooking key facts.

Your message should be single-spaced and justified to the left. In terms of substance, writing should be as brief and plain as possible. Always double-check your invoice email as it is a financial letter.

Mention the Attachments on the Letter

Enclosures related to attachments such as your invoice. Four lines below your conclusion, write “Enclosures.” You can arrange the attachments alphabetically or specify the number of attachments. Mention the attachments in the last line. To the sentence, add the term “enclosures.” Separate each attachment you send with the email with a comma.

Example of Invoice Letter

Example of Invoice Letter

Molly Rays
Blue Dash Art Knook
45 Riverside Road Ste 120
Beverly Hills CA 90201


February 1, 2020.


Ms. Willow Maison
017 Stanford Lane
BallGround, Maine 04110


Subject Line: Payment due for invoice no. 117

Dear Willow Maison,

I hope that you’re well. Please find attached invoice 117, dated January 02, 2020, i.e. last month’s paint supplies. As previously stated, the payment deadline for this invoice is March 02, 2020. Please keep in mind that we levy a $60 late fee every day after the due invoice date has passed. You will gain a 20% discount if you pay before the unpaid invoice date. You can mail a check to the above-mentioned address.

It was a pleasure to collaborate with you on this project. I hope to work with you on other projects in the future.


Yours sincerely,
Molly Rays
Blue Dash Art Knook
Enclosures: Invoice no. 117.

Example of Payment Letter

Example of Payment Letter

Jenna Michaels
Hollywood Groomers
64 Sunnyside Road Ste 400
Beverly Hills CA 90201


February 1, 2020.


Ms. Willow Maison
017 Stanford Lane
BallGround, Maine 04110


Subject Line:Payment Completed for Invoice no. 125

Dear Willow Maison,

Please find the enclosed check for $17,000. Your invoice with the above payment has the number 125 and is dated February 1st, 2020. According to the invoice, the funds get paid for all magazine advertisements scheduled to run in 2020.

We would like to express our appreciation for your services and ongoing cooperation in the realm of print media advertising. We are excited to renew your services for the future year.

Thank you,
Hollywood Groomers
Enclosures: Check no. 1710.

What is the Best Time for Sending an Invoice Letter?

The following are some instances in which an invoice letter is required:

Advance Payments

Using an invoice letter template for advance payments, businesses regularly compose and send professionally written letters asking the client or customer to make a down payment. When an order’s value is high, in particular, it is done to lower financial risks. Businesses can get a portion of their income in advance of starting work for a given client with advance payment terms.

On Purchase

A business is sending invoice letters to its customer when a sale or purchase is made. At this stage, they can send both a bill and an invoice letter simultaneously to demand payment right away. It is the most typical time to write an invoice letter for a bill payment to avoid late payment.

After Specific Intervals Between Projects

Payments are frequently provided upon the completion of specific phases or payment schedules in long-term contracts. When a payment is due, businesses can send invoice letters to clients to help them remember and satisfy their obligations.

Late Payments

Despite repeated warnings, some customers reject or postpone payment. A late payment letter is given to such customers in an attempt to minimize past-due payments. Many small businesses issue invoice letters highlighting the legal repercussions of frequent late payments.

Guidelines for Writing a Winning Invoice Letter

When writing an invoice letter, there are a few things to keep in mind. A good invoice letter will help you be paid faster and on time without jeopardizing your connection with the customer.

  • Write an invoice letter on one page only: Extra-long letters are more likely to be ignored, leaving vital information out.
  • Create client-specific content: Address all of their concerns and offer succinct answers to all of their queries. Include all of the details the consumer will require to complete the payment process.
  • Incorporate future invoices: Include any upcoming invoices in the same letter to give the client a heads-up. It is typically a good idea to keep the customer up to payment date on their past, current, and future bills.
  • Consider others and be pleasant: Make careful to emphasize that the initial payment was done in a pleasant but firm way. However, take care not to overextend yourself. When interacting with customers in whatever capacity, business-client relationship etiquette should always be observed. Small businesses should always conduct themselves properly.
  • Keep your letter short and sweet: Make sure the letter is simple to read and understand. Your payment information message should not contain any jargon, complicated words, or difficult language. Avoid using force, as this may alienate the consumer and talk. By being explicit, you may be able to avoid misunderstandings.
  • Send your invoice payment request letter as soon as possible overdue invoice letter: Small Businesses that want to communicate with customers quickly must send payment reminder letters on time. Avoid keeping the customer in the dark for a lengthy amount of time. Ongoing communication is vital to the health and efficiency of the firm.
  • Personalization should be prioritized: Even if you follow the overall pattern of a sample billing letter, you should add your personal touch to it. The basic structure for an invoice letter may be used consistently with a few minor changes for each client. As a result, you may receive confident replies and establish deeper ties. Personalization includes more than merely renaming each letter. The entire piece of content should revolve around the client’s journey. Your letter should look to have been handwritten rather than automatically created.
  • While writing your payment letter, keep your main goal in mind: Concentrate on the fundamental goal of receiving compensation. Mentioning the invoice number, date, and total speeds up the payment process. Briefly summarise the two parties’ commercial dealings so that the receiver remembers and recognizes them.
  • Maintain cash flow record of your invoice letters: Initially, an invoice letter is provided together with invoices whenever a task is completed or the essential materials are supplied. A payment follow-up invoice letter might be written differently. It must exactly summarise the substance of the prior letters to encourage the consumer to pay.
  • Several through proofreadings: Check the letter many times to make sure nothing is missing. Even minor errors in the amount or due date might cause delays and unnecessary problems.
  • Make use of an easy-to-read format: Use a framework where each paragraph focuses on a particular goal. Furthermore, each phrase should have distinct information. This format separates the letter into easily remembered pieces.
  • Always be courteous: Whether it’s your first or tenth invoice letter, being polite will help you retain current clients while also attracting new ones. When addressing someone, use their full name instead of a nickname.
  • Never disclose too much information: Just provide the necessary details in the letter. If you wish to communicate with the corporation confidentially, be sure your issue is essential and supports your direct deposit demand. Any other subject or rumor may result in the client not taking you seriously and maybe not paying the bills, among other negative consequences. If you are writing a letter after chatting with a customer, make sure to address their problems and respect their perspectives.
  • Always keep your document Safe: All invoice letters and other documents should be kept in a secure location. You may utilize cloud storage to safeguard your information from viruses and computer accidents. Some sectors need the storage of invoice letters. As a result, businesses must be well informed of the essential compliances to carry out their record-keeping activities effectively.
  • Design your letters: Businesses may add their logo, slogan, and other identifying elements to their bills and payment letters. All communication and direct mail pieces should represent a company’s brand at all times. The PostGrid print and mail platform allows you to easily customize anything. Furthermore, you should craft your communications so that they develop solid relationships while also positively portraying your company. Never underestimate the importance of a company’s emails in terms of promotion and brand growth.

How Can Businesses Avoid Late Payments?

Clients are sent invoice letters to encourage them to pay as soon as feasible. However, there are a few things you can do to improve the effectiveness of your invoice letter of payment.

Check that you Understand the Payment Conditions

A payment details letter can be submitted to confirm the agreed-upon payment arrangements. Additionally, if you provide such a letter, it may be used as evidence to support a direct deposit claim following the earlier negotiated terms. To avoid future problems, it is critical to be clear about the payment terms.

Taking Precautions

You must send regular follow-up direct mail and invoice emails to your clients to remind them to settle their amounts. It is incredibly successful at accepting money with small delays. Being proactive will allow you to keep in touch with your consumers, which is beneficial to your business. You can consider conducting additional business with them while putting pressure on them to clear their prior dues.

Offer Early Payment Discounts

Offering incentives to induce customers to pay is an effective debt-collection strategy. You might provide a fixed rate of discount on your forthcoming project with them, or you could provide certain concessions on the present billing. Create a cover letter to be sent first, in the format of a billing letter. You can utilize this strategy if the buyer refuses preliminary payment for anything.

Make Partial Payments Available

Part payments and installments are two more ways to encourage your consumers to pay you. Allowing your client to pay in small installments in a timely manner may help you prevent an overdue payment.

Certified Mail will be used to Send Invoice Letters

You may send an invoice send a bill payment using USPS-certified mail. There is an original postal receipt available that certifies that your mail was delivered to your customer. The return receipt might be used to resolve disputes in court.


A well-written invoice letter gives you the upper hand by clearly stating when payment is due and who to contact if there are any issues. Regardless of the size or industry of the firm, it is critical to send a polished invoice letter for payment.

Moon Invoice Online Invoicing Software can take you a step further in this electronic invoicing process and create effective invoices and automate your invoice-chasing procedure to get fast payments and avoid overdue invoice letters.


Jayanti Katariya
Jayanti Katariya About the author

Jayanti Katariya is the founder & CEO of Moon Invoice, with over a decade of experience in developing SaaS products and the fintech industry. He holds a degree in engineering. Since 2011, Jayanti's expertise has helped thousands of businesses, from small startups to large enterprises, streamline invoicing, estimation, and accounting operations. His vision is to deliver top-tier financial solutions globally, ensuring efficient financial management for all business owners.