Unpaid invoices are bills or invoices that a business has issued to its customers but that have not yet been paid. These invoices are considered accounts receivable for the business, meaning they are expected future cash inflows that the business is entitled to receive. Unpaid invoices can affect a company’s financial health: a 2024 study found that 50% of invoices issued by US businesses become overdue. It’s important to collect unpaid invoices since revenue that has not yet been realized in cash form can impact the business’s ability to manage its finances and invest in growth or operations.

Below, we’ll discuss unpaid invoices and their business implications: what causes them, early indicators, how to prevent them, and how to respond when they do occur.

What’s in this article?

• How unpaid invoices affect business health
  
• How to prevent unpaid invoices
  
• How to make your customer pay overdue invoices
  
• How Stripe Invoicing can help
  

How unpaid invoices affect business health

Unpaid invoices can impact a business’s financial health in the following ways:

• Cash flow: Businesses rely on a steady inflow of cash to cover operational costs such as salaries, rent, and utilities. When payments are delayed, it can create cash flow gaps, making it challenging for the business to meet its financial obligations.

• Resource allocation: Managing unpaid invoices often requires additional resources such as time and personnel to follow up with clients and attempt to collect outstanding payments. This effort diverts resources away from other productive activities, potentially affecting overall business efficiency.

• Budgeting: Uncollected revenue from unpaid invoices can make it difficult for businesses to accurately forecast their finances, complicating budgeting and financial planning and making it harder to effectively allocate resources for future projects or investments.

• Credit: Businesses often rely on lines of credit or loans for their operations and growth. High levels of unpaid invoices can affect a business’s credit standing, making it more difficult or expensive to secure financing.

• Investment and growth: The uncertainty and financial strain caused by unpaid invoices can limit a business’s ability to invest in new opportunities or areas of growth. Without reliable cash flow, it’s challenging to fund innovation, expand operations, or hire additional staff.

• Supplier relationships: Unpaid invoices can strain a company’s ability to pay its suppliers on time, which may harm business relationships and lead to less favorable terms in the future.

How to prevent unpaid invoices

Frequent unpaid invoices can both directly impact financial health and indicate deeper issues within the business, such as problems with the product or service quality, customer satisfaction, or the effectiveness of the company’s credit control processes. Businesses should both mitigate the immediate effects of unpaid invoices and seek to understand the underlying reasons for their occurrence.

Causes and warnings

Businesses that recognize common reasons (and red flags) for nonpayment can take proactive measures and mitigate risks associated with unpaid invoices. Here are some reasons and warning signs that a customer might not pay on time or at all.

Potential causes of nonpayment

• Poor communication: Customers might not pay invoices due to misunderstandings or lack of clarity about the payment terms or details of the products or services.

• Disputed charges: Customers might not pay an invoice if they disagree with the charges or are dissatisfied with the goods or services received.

• Inaccurate invoicing: Errors in invoicing such as listing incorrect amounts, billing the wrong customer, or not itemizing services can lead to delayed payments.

• Complex payment processes: If the payment process is complicated, customers might delay payment due to the inconvenience.

• Customer financial difficulties: Customers might have their own cash flow problems, affecting their ability to pay on time.

• Lack of follow-up: Customers may forget or deprioritize payment without timely reminders or follow-up from the business.

Potential warning signs of nonpayment

• History of late payments: If a customer has a history of paying late or has been inconsistent with their payments in the past, this pattern has a good chance of continuing. Monitoring payment histories can help identify these trends.

• Poor communication: A customer who is unresponsive or consistently avoids communication, especially regarding invoices or payment queries, may be at risk of nonpayment. Difficulty in reaching the right person or department for payment matters can also be a red flag.

• Financial instability: Be aware of signs that a customer may be experiencing financial difficulties. This could include news about layoffs, public financial losses, or industry downturns that could impact the customer’s ability to pay.

• Disputes and complaints: Frequent disputes over invoices or complaints about goods or services, even if they seem minor, can be a precursor to nonpayment. These might be used as reasons to later withhold payment.

• Sudden changes in order patterns: A sudden increase or decrease in orders without a clear reason can be a sign of trouble. For instance, a large, unusual order might indicate a customer is extending beyond their means.

• Unwillingness to provide financial information: A customer in a B2B transaction who is reluctant to provide credit references or financial information could indicate potential payment issues.

• Change in contact information: Frequent changes in billing addresses, contact numbers, or key personnel without clear communication can be a bad sign, indicating a possible attempt to evade payment responsibilities.

• Unusual urgency: If a new customer is pushing unusually hard for a rush job without a willingness to accommodate rush fees or up-front payment, it could be a sign that they’re planning to receive the service or product without paying.

• Negotiation of payment terms after delivery: A customer who tries to renegotiate payment terms after receiving goods or services may be looking for ways to delay or reduce payment.

• Partial payments: While partial payments can sometimes be a good faith effort to settle an invoice, they can also indicate a customer’s inability to pay the full amount.

Recognizing these warning signs early can help businesses implement appropriate measures such as requiring up-front payments, adjusting credit terms, or increasing monitoring and follow-up efforts to minimize the risk of nonpayment and protect their financial health.

Best practices to prevent unpaid invoices

Use real-time reporting and set alerts

Use software that provides real-time dashboards showing the status of accounts receivable including outstanding invoices, paid invoices, and aging reports.

Communication

Clearly communicate with customers about payment terms, deadlines, and details of the goods or services provided. Provide a customer portal where clients can view their invoice history, pay outstanding invoices, and communicate with your finance team. When communicating about invoices, approach each interaction with understanding and empathy. Recognize that customers can face temporary financial issues, and be open to negotiating realistic payment plans while ensuring your business’s needs are also met.

Online payment

Use platforms that allow customers to pay invoices directly online. For example, Stripe offers a suite of payment processing tools that can be integrated into your invoicing system and allow customers to pay with credit cards, bank transfers, or other methods.

Automatic invoice generation

Use software to automatically generate and send invoices to customers. This ensures timely billing and reduces manual errors.

Payment terms and late fees

Clearly outline payment terms including due dates, acceptable payment methods, and any potential late fees before commencing work. Have the customer acknowledge these terms in writing. Consider adjusting payment terms based on a customer’s credit, or requiring shorter terms or up-front payments for higher-risk customers.

Alternative payment options

Offer nontraditional payment options when possible. Online payments in particular allow for a wider variety of payment options for customers, from ACH transfers to buy now, pay later (BNPL).

Tech integrations and APIs

Integrate your accounts receivable management software with existing enterprise resource planning and customer relationship management systems for a unified view of customer interactions and financial data. This can help you stay informed of which invoices are unpaid and your business’s history with the client. Application programming interfaces (APIs) can connect different systems and automate data transfer. For instance, Stripe’s APIs allow for easy integration with other financial or business management tools, enabling a cohesive workflow.

Overdue payment follow-ups

Initiate contact as soon as a payment is overdue. The first reminder should be friendly, assuming it may be an oversight or minor issue. Then, have a systematic approach for follow-up, including a schedule for reminders via various communication channels (e.g., email, phone calls, and letters). Consider using invoicing software that automatically sends reminders for overdue payments, keeping track of all communication.

How to make your customer pay overdue invoices

When a customer hasn’t paid their invoice, take these steps in order:

Send a reminder email

In this email, avoid confrontational language and focus on finding solutions. Even in challenging situations, maintain professionalism. Emphasize the importance of your business relationship in communications, signaling that you value the ongoing partnership beyond just the transaction.

Charge late payment fees

Establish late fees in writing before commencing work so that when late payments occur, there’s already an established process that the customer knows.

Letter of demand

Before initiating formal legal action, a demand letter is often sent to the debtor. This letter outlines the unpaid amount, the history of attempts to collect, and a final deadline for payment. It also indicates that legal action will be taken if the payment is not received by the specified date.

Start legal action

If your business encounters persistent nonpayment of invoices despite exhaustive internal collection efforts, you may need to consider legal avenues for recovery. Different scenarios will come with different options. For example, if the debtor is based in a different country, the complexity of debt recovery increases—you’ll need to work through the legal systems of multiple countries and might need to partner with legal entities or debt collection agencies specializing in international debt. Throughout the debt recovery process, it’s important to comply with local laws and regulations such as the Fair Debt Collection Practices Act (FDCPA) in the United States, for example, which sets standards for the treatment of debtors and prohibits abusive collection practices.

Before pursuing legal action, assess the cost-effectiveness of legal proceedings, considering legal fees, court costs, and the debtor’s ability to pay.Consult with an attorney who specializes in debt collection or commercial law to understand your options. Potential legal avenues for debt recovery are outlined below:

• Small claims court: For relatively small amounts, businesses can file a claim in small claims court. The maximum amount that can be claimed varies by jurisdiction, ranging from $2,500 to $25,000 in the US. This process is generally quicker and less formal than higher courts, and in many cases, legal representation is not required.

• Civil lawsuit: If the amount exceeds the small claims threshold, the next step is to file a lawsuit in a civil court. This process is more formal and complex and typically requires legal representation. The court has the authority to issue a judgment against the debtor if the claim is successful.

• Mediation or arbitration: Before or during the legal process, parties might agree to alternative dispute resolution methods such as mediation or arbitration, which both involve a neutral third party. These methods can be faster and more cost-effective, creating a mutually agreeable solution without a court trial.

If you do go to court and receive a judgment in your favor, collecting the debt can still be challenging. The following steps may be taken to enforce the judgment:

• Writ of execution: This court order enables the seizure of assets or bank accounts belonging to the debtor to satisfy the debt.

• Garnishment: This legal process allows the creditor to intercept funds that are due to the debtor, such as wages, to pay off the debt.

• Lien: Placing a lien on the debtor’s property ensures that the debt will be paid off when the property is sold.

How Stripe Invoicing can help

Stripe Invoicing simplifies your accounts receivable (AR) process—from invoice creation to payment collection. Whether you’re managing one-time or recurring billing, Stripe helps businesses get paid faster and streamline operations:

• Automate accounts receivable: Easily create, customize, and send professional invoices—no coding required. Stripe automatically tracks invoice status, sends payment reminders, and processes refunds, helping you stay on top of your cash flow.

• Accelerate cash flow: Reduce days sales outstanding (DSO) and get paid faster with integrated global payments, automatic reminders, and AI-powered dunning tools that help you recover more revenue.

• Enhance the customer experience: Deliver a modern payment experience with support for 25+ languages, 135+ currencies, and 100+ payment methods. Invoices are easy to access and pay through a self-serve customer portal.

• Reduce back-office workload: Generate invoices in minutes and reduce time spent on collections through automatic reminders and a Stripe-hosted invoice payment page.

• Integrate with your existing systems: Stripe Invoicing integrates with popular accounting and enterprise resource planning (ERP) software, helping you keep systems in sync and reduce manual data entry.

Learn more about how Stripe can simplify your accounts receivable process, or get started today.