What It Is and How to Estimate It

What Is an Allowance for Doubtful Accounts?

When a business extends credit to customers, it’s taking a leap of faith. Despite careful screening, some customers will inevitably fail to pay. This means companies have to prepare for the financial impact of unpaid invoices through an accounting move known as the “allowance for doubtful accounts.”

This accounting practice not only provides a more accurate picture of a company’s financial health but also aligns with key accounting principles that govern financial reporting. Understanding how businesses account for potential failures to pay makes how a firm manages risk far clearer. We’ll take you through this accounting practice below.

How Does Allowance for Doubtful Accounts Work?

The allowance for doubtful accounts is a company’s educated guess about how much customers owe that will never come in. It appears on the balance sheet as a contra-asset, directly reducing the accounts receivable (AR) balance to show a more conservative, realistic value of expected collections.

This practice serves two purposes.

1. First, it upholds the matching principle, a cornerstone of accounting and generally accepted accounting principles (GAAP), that requires expenses to be recognized in the same period as their related revenues. By estimating bad debt expenses when a sale occurs—not months or years later when a customer defaults—the company creates a more accurate picture of each period’s profitability.
2. Second, it makes financial statements more accurate by accounting for the real risks companies face when they rely on customers to pay in the future.

Creating this allowance doesn’t require knowing exactly which customers will default. Instead, companies use historical patterns, customer data, and economic trends to make estimates.

How To Estimate the Allowance for Doubtful Accounts

Determining the right amount to set aside for potentially uncollectible invoices requires both art and science. Companies must choose a method that balances accuracy with being practical, considering their industry, customer base, and available data.

Percentage of Sales Method

This method is simplest for businesses with stable customer payment patterns. Companies apply a flat percentage to their credit sales for the period based on historical collection rates.

For example, a retail business analyzing five years of data might discover that about 2% of credit sales typically go unpaid. If this quarter’s credit sales total $500,000, it would record a $10,000 addition to the allowance for doubtful accounts and a corresponding $10,000 bad debt expense.

Accounts Receivable Aging Method

This method is a bit more nuanced since it recognizes that the longer an invoice remains unpaid, the less likely it is to be collected—it’s not just applying a raw percentage to all credit sales. Companies sort their AR by age categories and apply increasingly higher percentages to the older ones.

Let’s consider a hypothetical use of the aging method for a manufacturing firm’s AR:

• $200,000 outstanding less than 30 days (1% estimated uncollectible)
• $50,000 outstanding 31 to 60 days (5% estimated uncollectible)
• $25,000 outstanding 61 to 90 days (20% estimated uncollectible)
• $10,000 outstanding over 90 days (50% estimated uncollectible)

The firm’s allowance calculation would be as follows:

($200,000 × 0.01) + ($50,000 × 0.05) + ($25,000 × 0.20) + ($10,000 × 0.50) = $12,500.

Risk Classification Method

Some companies take customer-specific factors into account by classifying customers into risk categories. A technology firm might segment its AR by customer type, assigning different uncollectible percentages to each group:

• Enterprise clients (1% risk)
• Mid-market businesses (3% risk)
• Small businesses (7% risk)
• Startups (12% risk)

This targeted approach can provide greater accuracy for businesses with clearly defined customer segments that have different payment behaviors.

Historical Percentage Method

Companies with a long operating history may rely on their long-term average of uncollectible accounts. If a wholesale distributor finds that over a decade, about 3.2% of total AR typically becomes uncollectible, they might apply this percentage to their current receivables balance.

This works best when a company’s customer base and economic conditions stay relatively stable.

Pareto Analysis Method

Since a small percentage of customers often represent a large portion of receivables, some companies employ Pareto analysis (the 80/20 principle). They focus their estimates on major accounts that constitute most of their receivables.

For instance, a construction materials supplier might assess the collectibility of receivables from its 20 largest customers (representing 75% of outstanding balances) while applying a standard percentage to smaller accounts.

Specific Identification Method

When feasible, companies may review individual customer accounts to identify specific balances unlikely to be collected. An architectural firm with 50 clients might flag three accounts—a bankrupt developer, a chronically late-paying client, and a customer in a legal dispute—and set the allowance equal to their balances.

How To Account for the Allowance for Doubtful Accounts

Accounting for potentially uncollectible accounts involves several distinct steps while creating a paper trail that tracks your expectations about customer payments and what actually happens when some customers don’t pay.

Establishing the Allowance

When a company sets up its allowance for doubtful accounts, it creates two simultaneous accounting entries. First, it records a “bad debt expense” that reduces the current period’s profit. Second, it creates a contra asset account called “allowance for doubtful accounts” that reduces the reported value of AR without changing the underlying customer balances.

Suppose a home appliance retailer expects about $75,000 of its $1.5 million in outstanding customer invoices to go unpaid. The company would record the following:

• Bad debt expense: $75,000
• Allowance for doubtful accounts: $75,000

This transaction doesn’t affect individual customer accounts—every customer still officially owes its full balance. Instead, it creates a pool of expected losses that sits on the balance sheet, reducing the overall reported value of AR from $1.5 million to $1.425 million.

Adjusting the Allowance

As time passes, companies gain better information about which accounts might not be collected. Economic conditions change, customer payment patterns evolve, and the receivables balance fluctuates. These factors often require adjustments to the allowance.

Suppose our appliance retailer reviews its receivables six months later and determines the allowance should total $90,000 based on increasing late payments. Since the account already has a $75,000 balance, the company needs to record another $15,000:

• Bad debt expense: $15,000
• Allowance for doubtful accounts: $15,000

Of course, sometimes adjustments go the other way. If collection efforts are more successful than anticipated, the company might cut its allowance, decrease bad debt expenses, or even record a gain from recovery.

Writing Off Accounts

When a specific customer account is deemed uncollectible—perhaps after multiple failed collection attempts, legal action, or bankruptcy—the company removes that balance from both AR and the allowance.

If our retailer determines that a $7,200 balance from a bankrupt customer will never be collected, it records:

• Allowance for doubtful accounts: $7,200
• Accounts receivable: $7,200

Notice this transaction doesn’t create any new expense since the expense was already recognized when the allowance was established or adjusted.

Recovering Written-Off Accounts

Sometimes, even in accounting, there are welcome surprises, e.g., when a previously written-off account pays unexpectedly. Perhaps a customer emerges from bankruptcy with some ability to pay, or a collections agency succeeds after the account was deemed hopeless.

If a retailer suddenly receives $2,500 from the previously written-off customer, it would first reinstate the portion of the account being paid:

• AR: $2,500
• Allowance for doubtful accounts: $2,500

Then it would record the cash receipt:

The Bottom Line

The allowance for doubtful accounts transforms an uncomfortable business reality—that some customers won’t pay—into a manageable accounting method. By estimating potential losses before they occur, companies present a more honest picture of their financial health while properly matching expenses to the periods when they earn revenue.

Small businesses especially might resist establishing an allowance because they don’t want to “plan for failure.” However, by acknowledging credit risk upfront, firms make better decisions about which customers to extend credit to and how aggressively to follow up on collections.