How to Calculate Bad Debt Expense: Formula, Allowance Method & Examples

When a business extends credit, the amount recorded as accounts receivable does not always equal the amount it will ultimately collect. Customers may pay late, dispute an invoice, experience financial difficulties, or fail to pay altogether. The portion of receivables a business does not expect to collect must be estimated and recognized appropriately in its financial reporting.

Understanding how to calculate bad debt expense helps businesses estimate potential losses, value accounts receivable more realistically, and make better decisions about credit and collections. The allowance method is commonly used to estimate uncollectible amounts before specific accounts are written off, helping align expected losses with the revenue that generated them.

For businesses subject to U.S. GAAP, the accounting treatment must also be considered in the context of ASC 326, Financial Instruments—Credit Losses. The expected credit loss framework uses relevant historical experience, current conditions, and reasonable, supportable forecasts to estimate credit losses. Recent 2026 guidance from the Office of the Comptroller of the Currency further reflects the continuing importance of allowance-for-credit-loss estimates under ASC 326.

In this guide, we’ll explain the bad debt expense formula, show how to calculate bad debt expense using the allowance method, and walk through practical examples.

What Is Bad Debt Expense?

Bad debt expense is the amount a business estimates it will not be able to collect from its accounts receivable. When a customer receives goods or services but does not ultimately pay the amount owed, the business faces a credit loss that needs to be reflected in its financial records.

Bad debt can arise from several situations, including customer financial difficulties, bankruptcy, billing disputes, or prolonged nonpayment. For businesses that regularly sell on credit, estimating these losses is important because reported accounts receivable should reflect the amount the company reasonably expects to collect.

Bad Debt Expense vs. Uncollectible Accounts

The terms “bad debt expense,” “uncollectible accounts expense,” and “credit loss expense” can sometimes be used interchangeably in business discussions, but the exact terminology depends on the accounting framework and type of receivable involved.

For example, if a company has $500,000 in accounts receivable but estimates that $15,000 will not be collected, it needs to account for that expected loss rather than assuming the full $500,000 will become cash.

This is why businesses use an allowance to reduce the carrying amount of receivables to the amount they reasonably expect to collect.

Aspect	Bad Debt Expense	Uncollectible Accounts
Meaning	The expense recognized for amounts a business expects or determines it will not collect.	Customer receivables that are unlikely or unable to be collected.
Accounting role	Represents the financial loss/expense associated with uncollectible receivables.	Represents the specific receivable amounts that may become or have become uncollectible.
When recognized	Can be estimated in advance under the allowance approach or recognized when a specific receivable becomes uncollectible, depending on the accounting method.	Generally identified when there is evidence that a customer balance will not be collected.
Financial statement impact	Recorded as an expense, reducing income.	Reduces accounts receivable when the amount is written off.
Example	A company estimates that $5,000 of its receivables will not be collected and records $5,000 as bad debt expense.	A customer owes $5,000, and the business determines the balance is no longer collectible.
Common terminology	Also called uncollectible accounts expense in accounting literature.	Often referred to as bad debts or uncollectible receivables.

How to Calculate Bad Debt Expense

The bad debt expense calculation depends on the accounting method and estimation approach a business uses. For businesses applying the allowance approach, the goal is to estimate the portion of receivables that is not expected to be collected and recognize the related credit loss appropriately.

A simple way to understand the calculation is:

Bad Debt Expense = Estimated Uncollectible Receivables

However, the actual calculation varies depending on the method used. Common approaches include estimating losses as a percentage of credit sales, applying an estimated loss rate to accounts receivable, or analyzing receivables by how long they have remained outstanding.

Basic Example

Suppose a business records $200,000 in credit sales during the year and estimates that 2% will ultimately be uncollectible.

Bad Debt Expense = $200,000 × 2%

Bad Debt Expense = $4,000

The business would therefore estimate $4,000 of bad debt expense for the period.

For more detailed allowance calculations, businesses may use historical loss experience and adjust the estimate for current conditions and reasonable, supportable forecasts. Under the current credit-loss framework, the appropriate estimation method depends on the nature of the receivables and the information available to the business.

The Office of the Comptroller of the Currency’s July 2026 guidance also emphasizes that allowance estimates should reflect the applicable credit-loss methodology and the risk characteristics of the assets being evaluated.

In the next sections, we’ll look at the major methods businesses can use to calculate bad debt expense, including the percentage-of-sales method, percentage-of-receivables method, and aging of accounts receivable.

What Is the Allowance Method for Bad Debt Expense?

The allowance method estimates the amount of accounts receivable a business does not expect to collect before individual customer balances are written off. Instead of waiting until a specific account becomes uncollectible, the business records an estimated credit loss for the relevant reporting period.

This approach provides a more realistic view of receivables because the allowance for doubtful accounts reduces gross accounts receivable by the amount the business expects to lose. The allowance is a contra-asset account, meaning it offsets the related receivable on the balance sheet.

How the Allowance Method Works

The process generally follows these steps:

• Estimate expected uncollectible amounts based on an appropriate method.

• Calculate the required allowance for doubtful accounts or credit losses.

• Record bad debt expense for the estimated loss.

• Credit the allowance account rather than reducing a specific customer’s receivable at this stage.

• When a specific account is later determined to be uncollectible, write it off against the allowance.

Bad Debt Expense Formula Using the Allowance Method

Under the allowance method, a business estimates the amount of receivables it expects not to collect and records an allowance for those expected credit losses. There is no single formula that applies to every business; the calculation depends on the estimation method and the characteristics of the receivables.

For example, if a business has $250,000 in accounts receivable and estimates that 3% will not be collected:

$250,000 × 3% = $7,500

The estimated credit loss would therefore be $7,500, subject to the business’s specific accounting methodology and any required adjustments.

In practice, the allowance calculation can be more detailed. A business may divide receivables into groups based on similar risk characteristics or how long invoices have been outstanding, then apply different historical loss rates to each group. 

How Does the Percentage of Accounts Receivable Method Work?

The percentage of accounts receivable method estimates the amount of receivables a business expects to be unable to collect based on the ending accounts receivable balance. Unlike the percentage-of-credit-sales method, which focuses on sales generated during the period, this approach focuses on receivables still outstanding at the reporting date.

Under current U.S. GAAP guidance, businesses have flexibility in choosing an appropriate method for estimating expected credit losses. The estimate should consider relevant information, including historical experience, current conditions, and reasonable and supportable forecasts. 

How Do You Calculate Bad Debt Using Accounts Receivable?

Suppose a business has:

• Ending accounts receivable: $300,000
• Estimated uncollectible rate: 4%

The calculation would be

$300,000 × 4% = $12,000

The business therefore estimates that $12,000 of its receivables may not be collected.

However, there is an important accounting detail: the $12,000 is the desired ending allowance balance, not necessarily the amount of bad debt expense to record for the current period. If the allowance account already has a balance, the business generally records only the adjustment needed to bring the allowance to the required level. 

How Do You Record Bad Debt Expense?

After calculating the estimated bad debt expense, the next step is recording it correctly in the accounting records. Under the allowance method, businesses generally recognize the expected loss by recording bad debt expense and increasing the allowance for doubtful accounts.

Account	Debit	Credit
Bad Debt Expense	$X	—
Allowance for Doubtful Accounts	—	$X

For example, if a business estimates that $10,000 of its receivables will not be collected, the entry would be

Account	Debit	Credit
Bad Debt Expense	$10,000	—
Allowance for Doubtful Accounts	—	$10,000

This records the estimated loss while maintaining the original accounts receivable balance. The allowance acts as a contra-asset account, reducing the amount of receivables reported on the balance sheet to the amount the business expects to collect.

What Happens When an Account Is Written Off?

If a specific customer balance is later determined to be uncollectible, the business writes it off against the existing allowance. For example, if a customer with a $2,000 outstanding balance is determined to be unable to pay, the entry would generally be

Account	Debit	Credit
Allowance for Doubtful Accounts	$2,000	—
Accounts Receivable	—	$2,000

Notice that bad debt expense is not recorded again at the time of the write-off. The expense was already recognized when the allowance was established or adjusted. The write-off simply removes the specific uncollectible balance from accounts receivable and reduces the allowance.

What Is the Bad Debt Ratio and How Do You Calculate It?

The bad debt ratio measures the amount of sales or receivables that a business ultimately fails to collect. It can help management understand how much revenue is being lost to uncollectible accounts and monitor changes in credit and collection performance over time.

One commonly used calculation is the bad debt-to-sales ratio:

Bad Debt Ratio = Bad Debt Expense ÷ Net Credit Sales × 100

How Do You Calculate the Bad Debt Ratio?

Suppose a business reports:

• Bad debt expense: $8,000
• Net credit sales: $400,000

The calculation would be

($8,000 ÷ $400,000) × 100 = 2%

The business’s bad debt ratio is therefore 2%, meaning its bad debt expense represents 2% of its net credit sales for the period.

Why Is It Important to Track the Bad Debt-to-Sales Ratio?

Calculating the bad debt-to-sales ratio is useful, but tracking it consistently over time provides much more insight. A single period may not reveal whether a business is improving its collections or experiencing growing payment risk. Comparing the ratio across months, quarters, or years can help identify changes in customer payment behavior and collection performance.

What Can a Rising Bad Debt Ratio Indicate?

A consistently increasing ratio may indicate that a larger portion of sales is becoming difficult to collect. Possible reasons include:

• Customers taking longer to pay their balances
• Changes in customer credit quality
• More disputes or billing issues
• Longer payment terms
• Weak or delayed collection follow-up
• Economic conditions affecting customers’ ability to pay
• Ineffective credit and receivables policies

For example, if a company’s bad debt-to-sales ratio increases from 1% to 2.5%, management may want to investigate whether the change is related to a particular customer segment, sales channel, product line, or aging category.

Why Do Bad Debts Happen?

Bad debt usually occurs when a customer does not pay an amount owed and the business determines that the balance is unlikely to be recovered. While some unpaid accounts are caused by circumstances outside a company’s control, recurring bad debt can also point to weaknesses in credit, billing, or collection processes.

Understanding the causes is important because calculating bad debt expense only measures the potential loss; identifying the underlying causes can help businesses reduce future losses.

What Are the Common Causes of Bad Debt?

1. Customer financial difficulties

Customers may experience cash-flow problems, business losses, unemployment, or other financial challenges that make it difficult to pay outstanding balances.

2. Bankruptcy or insolvency

If a customer or business becomes insolvent, recovering the outstanding balance may become difficult or impossible.

3. Invoice disputes

Disagreements over pricing, products, services, quantities, or contract terms can delay payment. If disputes remain unresolved, an otherwise collectible receivable may eventually become a bad debt.

4. Inaccurate or delayed billing

Incorrect invoices, missing information, or delayed billing can create unnecessary payment delays and make receivables harder to collect.

5. Weak credit assessment

Extending credit without adequately assessing a customer’s ability or willingness to pay can increase collection risk.

6. Poor follow-up on overdue accounts

When overdue balances are not identified and addressed promptly, they can become increasingly difficult to recover.

7. Long payment cycles

The longer an account remains outstanding, the greater the potential collection risk. This is why businesses often monitor receivables by aging categories when estimating expected credit losses.

Under the current expected credit loss framework, businesses consider factors such as historical loss experience, current conditions, and reasonable, supportable forecasts when estimating expected credit losses. This reinforces the importance of understanding the factors that influence a company’s actual collection experience.

How Can Businesses Prevent and Reduce Bad Debt?

Calculating bad debt expense helps a business understand its potential losses, but preventing avoidable collection losses is even more valuable. A proactive receivables process can help businesses identify payment risks earlier, resolve issues faster, and improve the likelihood of collecting outstanding balances.

There is no single strategy that eliminates bad debt. Instead, businesses can combine better credit practices, timely communication, monitoring, and structured collection processes.

1. Set Clear Payment Terms

Clearly communicate payment terms before providing products or services on credit. Customers should understand the amount due, payment deadline, available payment options, and consequences of overdue balances.

Clear terms can reduce confusion and prevent avoidable payment delays.

2. Monitor Accounts Receivable Regularly

Businesses should regularly review outstanding receivables rather than waiting until balances become significantly overdue.

An aging report can help categorize accounts based on how long they have been outstanding and identify accounts that require earlier attention.

3. Follow Up Before Payments Become Severely Overdue

Payment reminders should not begin only after an account becomes seriously delinquent. Timely, consistent communication can help customers address missed payments before the balance becomes harder to recover.

4. Make It Easier for Customers to Pay

A complicated payment process can create unnecessary friction. Providing convenient payment options, clear instructions, and self-service experiences can make it easier for customers to resolve outstanding balances.

5. Prioritize Higher-Risk Accounts

Not every overdue account requires the same collection approach. Businesses can prioritize accounts based on factors such as balance size, age, payment history, and risk characteristics.

This allows collection teams to focus their time where it is most likely to have an impact.

How Can Recuvery Help Businesses Reduce the Risk of Bad Debt?

Calculating and tracking bad debt expense helps businesses understand their potential losses, but effective receivables management and collection processes can help address overdue accounts before they become harder to recover.

Recuvery helps businesses manage overdue accounts through an automated, structured approach to collections. Instead of relying entirely on manual follow-ups, businesses can use technology to organize collection workflows, communicate with customers, and make it easier to resolve outstanding balances.

What Can Businesses Do With Recuvery?

Automate collection communication.

Businesses can streamline repetitive follow-ups and maintain consistent communication with customers who have outstanding balances.

Prioritize accounts that need attention.

A structured approach to account prioritization can help collection teams focus their efforts on accounts that require more immediate attention.

Give customers convenient ways to resolve balances.

Making the payment and resolution process easier can reduce friction for customers who are ready to address an overdue balance.

Reduce manual collection work.

Automating repetitive tasks can give collection teams more time to focus on accounts that require human attention or more personalized communication.

Improve visibility into overdue accounts.

Centralized information can help businesses monitor outstanding balances and understand where accounts stand throughout the collection process.

The broader objective is simple: identify overdue accounts earlier, communicate consistently, and make resolution easier. These practices can support stronger receivables management and potentially reduce the number of accounts that ultimately become uncollectible.

Final Words

Knowing how to calculate bad debt expense is an important part of accurate financial reporting, but the calculation is only one part of effective receivables management. Businesses also need to understand why accounts become uncollectible and take proactive steps to improve their collection processes.

The allowance method, percentage-of-sales approach, percentage-of-receivables method, and aging analysis can help businesses estimate potential credit losses based on their circumstances. Businesses should also regularly monitor metrics such as the bad debt ratio, receivables aging, and collection performance to identify changes in payment behavior.

More importantly, reducing bad debt requires action before an account becomes a significant loss. Clear payment terms, timely reminders, convenient payment options, consistent follow-up, and automated collection workflows can help businesses manage overdue accounts more effectively.

For businesses handling a large volume of receivables, platforms such as Recuvery can help streamline collection workflows, organize overdue accounts, and make it easier for customers to resolve outstanding balances.

Frequently Asked Questions

1. What Is Bad Debt Expense?

Bad debt expense is the amount a business recognizes for receivables it does not expect to collect. It reflects the estimated or identified loss associated with customers who may not pay their outstanding balances.

2. How Do You Calculate Bad Debt Expense?

The calculation depends on the method used. A simple approach is to multiply the relevant credit sales or accounts receivable balance by an estimated uncollectible rate. Businesses may also use an aging schedule to apply different loss rates to receivables based on how long they have been outstanding.

3. What Is the Formula for Bad Debt Expense?

A commonly used basic formula is

Bad Debt Expense = Relevant Sales or Receivables × Estimated Uncollectible Rate

The appropriate calculation depends on the accounting method and the characteristics of the receivables.

4. What Is the Allowance Method for Bad Debt Expense?

The allowance method estimates expected uncollectible amounts before specific accounts are written off. The business records bad debt expense and establishes or adjusts an allowance for doubtful accounts or expected credit losses.

5. What Is a Bad Debt Allowance?

A bad debt allowance is an estimate of the portion of receivables that a business does not expect to collect. It is generally presented as a contra-asset that reduces the reported value of accounts receivable.

6. What is the difference between bad debt expense and a write-off?

Bad debt expense recognizes the expected or estimated loss. A write-off removes a specific receivable that has subsequently been determined to be uncollectible. Under the allowance approach, the write-off generally reduces both the allowance and accounts receivable rather than creating another bad debt expense.