Accounts Receivable Allowance: CECL, Methods, and Journal Entries

The accounts receivable allowance is a reserve you record against your outstanding invoices to reflect the portion you don’t expect to collect. It sits on the balance sheet as a contra-asset directly below accounts receivable, reducing the gross total to a net figure that shows what the company realistically expects to turn into cash. If your books show $500,000 in open invoices and you estimate $15,000 won’t be paid, net receivables report at $485,000.

The reserve exists because of the matching principle. Revenue from a credit sale hits the income statement when the sale happens, so the expected cost of any bad debt tied to that sale should hit the same period. Without an allowance, profits look inflated when the sale is booked and then take a sudden hit months later when a customer defaults. The allowance evens that out.

What CECL Requires

The rule governing this estimate is Accounting Standards Update 2016-13, codified as ASC Topic 326 and known as CECL, for Current Expected Credit Losses. CECL replaced the older “incurred loss” model, which let companies wait until a loss was probable before recognizing it.¹ Under CECL, you estimate expected credit losses over the entire life of a receivable at the moment it’s recorded.²

CECL phased in over several years and by 2026 applies to every entity following U.S. GAAP. SEC filers adopted it for fiscal years beginning after December 15, 2019; private companies and nonprofits for fiscal years after December 15, 2021.¹ The standard doesn’t prescribe a single calculation method. What it requires is that your estimate combine three inputs: historical loss experience, current conditions, and reasonable and supportable forecasts of future economic circumstances, producing your “best estimate of the net amount expected to be collected.”³

Methods for Calculating the Allowance

Percentage of Sales

This method applies a fixed loss rate to total credit sales for the period. If your history shows roughly 2% of credit sales go unpaid, and you booked $500,000 in credit sales, your bad debt expense for the period is $10,000. It’s fast, and it works best when your customer base and credit terms are stable. Its weakness is that it ignores changes in the age or risk profile of what’s currently outstanding.

Accounts Receivable Aging

The aging method looks at the balance sheet instead of sales. Every unpaid invoice goes into a bucket by how long it’s been outstanding: current, 1–30 days past due, 31–60, 61–90, and over 90. Older buckets carry higher expected loss rates. An invoice 30 days late might carry a 5% loss rate, while one past 90 days might sit at 40% or more. Multiply each bucket balance by its rate, add the results, and you have the allowance the balance sheet needs. Auditors and lenders generally prefer this approach because it reflects the current portfolio rather than a historical average.

Forward-Looking Adjustments

Under CECL, historical loss rates are only the starting point. You adjust them for what’s happening now and what you reasonably expect. Relevant factors range from borrower-specific data such as credit scores and financial condition to macroeconomic indicators like regional business conditions and collateral values.³ Rising unemployment, a shift in customer concentration toward a weaker industry, or looser credit terms all push the estimate up. This is where the judgment lives, and where auditors spend the most time.

Days Sales Outstanding as a Cross-Check

Days sales outstanding measures how long, on average, it takes to collect payment. Divide accounts receivable by credit sales for the period, then multiply by the number of days in the period. A DSO that keeps climbing while the allowance percentage holds flat is a signal to look closer. DSO doesn’t replace the aging or loss-rate work, but it’s a useful validation tool.

Data You Need to Build the Estimate

The aging report is the foundation. It lists every open invoice sorted into the bucket categories above, and even companies that lead with the percentage-of-sales method rely on it as a reality check.

You also need historical bad debt data. Compare receivables issued each year against amounts ultimately written off. That ratio gives you a baseline loss rate. Three years is a minimum; five or more produces a more reliable trend, especially if your customer base is cyclical.

Individual customer files matter too. If a major account is in bankruptcy or facing litigation that threatens its ability to pay, general loss percentages won’t catch that. Review credit files for customers in known distress and layer those specific reserves on top of the statistical estimate. Skipping this step is one of the fastest ways to end a period with an allowance that looks fine in aggregate and misses a large concentrated loss.

Journal Entries

Setting Up the Allowance

Debit Bad Debt Expense and credit Allowance for Doubtful Accounts. The expense hits the income statement and the reserve builds on the balance sheet in the same entry. Most companies post this at the close of each month or quarter, matching the expense to the revenue period.

Writing Off an Account

When a specific customer’s debt is confirmed uncollectible, debit Allowance for Doubtful Accounts and credit Accounts Receivable for that customer’s balance. Because the expense was already recognized when the allowance was set up, the write-off itself doesn’t touch the income statement. It just draws down the reserve.

Recovering a Written-Off Account

If a customer pays after being written off, use two entries. First, reinstate the receivable: debit Accounts Receivable, credit Allowance for Doubtful Accounts. Second, record the cash: debit Cash, credit Accounts Receivable. The two-step approach keeps the customer’s payment history accurate.

Period-End Adjustment

At the close of each period, reconcile the allowance balance to the latest aging analysis and updated forecasts. If the current balance is $12,000 and the fresh estimate calls for $15,000, book an additional $3,000 (debit Bad Debt Expense, credit Allowance). If write-offs and recoveries have left the balance above the new estimate, the adjustment reverses to reduce the expense.

The Allowance Is Not Tax-Deductible

The GAAP allowance does not translate to a tax deduction. Under Internal Revenue Code Section 166, a business can deduct a debt only when it actually becomes worthless.⁴ Congress repealed the reserve method for tax purposes in 1986 for most taxpayers. To claim the deduction, you need to show reasonable collection efforts and no realistic expectation of repayment; you don’t have to sue, but you do have to show a judgment would be uncollectible.⁵ The deduction lands in the year the debt becomes worthless, not earlier. A narrow exception exists for small banks under Section 585.⁶ For everyone else, expect your allowance balance and your tax bad debt figure to differ.

Disclosure for Public Companies

If you file with the SEC, you must disclose how you developed the estimate and present a roll-forward showing beginning balance, bad debt expense recorded, write-offs net of recoveries, and ending balance.⁷ CECL added disaggregation by year of origination and a description of the methods and information behind your forecasts.³

1
Board of Governors of the Federal Reserve System. FAQs on the New Accounting Standard on Financial Instruments – Credit Losses
2
Financial Accounting Standards Board. Credit Losses
3
Financial Accounting Standards Board. FASB Staff Q&A Topic 326, No. 2 – Developing an Estimate of Expected Credit Losses on Financial Assets
4
Office of the Law Revision Counsel. 26 USC 166 – Bad Debts
5
Internal Revenue Service. Topic No. 453, Bad Debt Deduction
6
Office of the Law Revision Counsel. 26 U.S. Code 585 – Reserves for Losses on Loans of Banks
7
U.S. Securities and Exchange Commission. Summary of Significant Accounting Policies – Rollforward of Allowance for Doubtful Accounts