Accounts Receivable & Bad Debt Expense: Allowance Method vs Direct Write-Off

Published: March 27, 2026

Article by Ryan O'Connell, CFA, FRM

Bad debt expense is one of the most important estimates in financial accounting — and one of the most scrutinized by investors and analysts. When a company extends credit to customers, some of those accounts receivable will inevitably go uncollected. Understanding how to estimate and record bad debt expense under GAAP is essential for evaluating whether a company’s reported receivables are realistic, for assessing earnings quality, and for making informed credit and investment decisions.

What Is Bad Debt Expense?

Bad debt expense represents the estimated cost of accounts receivable that a company does not expect to collect. It arises whenever a company sells goods or services on credit, because some customers will inevitably fail to pay.

To accomplish this, companies use a contra asset account called the Allowance for Doubtful Accounts (also called the Allowance for Credit Losses under CECL). This account reduces gross accounts receivable on the balance sheet to their estimated collectible amount:

The allowance method is required by GAAP whenever bad debts are material. A simpler approach — the direct write-off method — is permitted only when uncollectible amounts are immaterial.

The Allowance Method

The allowance method has three essential features, as described in Kieso, Weygandt & Warfield’s Intermediate Accounting (Chapter 7):

1. Estimate uncollectible accounts receivable and compare to the current allowance balance.
2. Record an adjusting entry — debit Bad Debt Expense, credit Allowance for Doubtful Accounts.
3. Write off specific accounts when they become uncollectible — debit Allowance, credit Accounts Receivable.

Journal Entries

How to Estimate Bad Debt Expense

GAAP provides several approaches for estimating the allowance for doubtful accounts, each with a different focus:

Percentage-of-Sales Method (Income Statement Focus)

This method applies a historical bad debt percentage to credit sales for the period. It provides good expense matching but does not directly measure whether the resulting allowance balance reflects the net realizable value of outstanding receivables. Under the CECL framework (ASC 326), this method is generally not appropriate as the sole estimation approach because it does not produce a balance-sheet-focused allowance.

Percentage-of-Receivables Method (Balance Sheet Focus)

This method applies a composite rate to total outstanding accounts receivable. It directly targets the balance sheet valuation of AR but uses a single rate for all receivables regardless of age.

Aging of Accounts Receivable (Preferred for Trade Receivables)

The aging schedule is the most common CECL-compliant method for trade receivables. It groups outstanding accounts receivable by days past due and applies progressively higher uncollectible percentages to older buckets.

CECL: Current Expected Credit Losses (ASC 326)

The CECL model replaced the previous incurred-loss model with a forward-looking approach. It became effective for SEC filers in 2020, with smaller reporting companies and private companies adopting in subsequent years. Key differences:

Note: the Allowance for Doubtful Accounts and the Allowance for Credit Losses refer to the same contra asset account. CECL did not create a new accounting mechanism — it changed how the allowance is estimated, not the underlying journal entry structure.

Allowance Method vs Direct Write-Off

GAAP provides two methods for recording bad debts, but only one is acceptable when uncollectible amounts are material:

How to Calculate Bad Debt Expense Using an Aging Schedule

The aging schedule is the most widely used method for estimating bad debt expense. Here is a step-by-step walkthrough:

1. Categorize outstanding AR by days past due — group into age buckets (e.g., 0–30 days, 31–60 days, 61–90 days, 91–120 days, over 120 days).
2. Assign estimated uncollectible percentages — based on historical loss experience and, under CECL, forward-looking adjustments for current conditions and reasonable forecasts.
3. Multiply each bucket’s total by its percentage — this gives the estimated uncollectible amount per bucket.
4. Sum all buckets — the total equals the required ending balance of the Allowance for Doubtful Accounts.
5. Compare to the existing allowance balance — the difference is the adjusting entry amount (Bad Debt Expense).
6. Record the adjusting entry — debit Bad Debt Expense, credit Allowance for Doubtful Accounts.

Factoring and Pledging Receivables

Companies sometimes need cash before customers pay their outstanding balances. Two common mechanisms accelerate cash collection from receivables:

Factoring (Sale of Receivables)

In a factoring arrangement, a company sells its receivables to a third party (called a factor) for immediate cash, minus a fee. The factor then collects directly from customers. The accounting treatment depends on whether the sale includes recourse:

• Without recourse (true sale): The seller transfers all credit risk to the factor. The seller recognizes a loss equal to the factor’s fee. Any holdback retained by the factor is recorded as Due from Factor (a receivable), not as additional loss.
• With recourse: The seller guarantees payment if customers default. The seller must record a recourse liability at fair value, increasing the recognized loss.

Pledging (Secured Borrowing)

When receivables are pledged as collateral for a loan, the company retains ownership and continues collecting from customers. The receivables remain on the company’s balance sheet, and a liability (Notes Payable) is recorded for the loan proceeds. FASB’s three-condition test determines whether a transfer of receivables qualifies as a sale or a secured borrowing:

1. Transferred assets are isolated from the transferor (beyond reach of creditors).
2. The transferee has the right to pledge or exchange the transferred assets.
3. The transferor does not maintain effective control via a repurchase agreement.

If all three conditions are met, the transfer is accounted for as a sale. Otherwise, it is a secured borrowing. For more on how receivable management fits into broader cash flow decisions, see Working Capital Management.

Notes Receivable

Notes receivable are written promissory notes — more formal than accounts receivable and typically involving longer payment terms. They may be interest-bearing (with a stated rate) or zero-interest-bearing (where interest is embedded in the face amount).

Recognition and Measurement

When the stated interest rate equals the market rate, the note is recorded at face value. When rates differ — or when a note carries no stated interest — the note is recorded at the present value of expected cash flows. The difference between face value and present value is recorded as a discount (or premium) and amortized to interest revenue over the note’s life using the effective-interest method.

Short-term notes receivable are valued the same way as accounts receivable — net of an allowance for doubtful accounts. Long-term notes require fair value disclosure in the notes to the financial statements. For related asset valuation concepts, see Intangible Assets & Goodwill and Asset Impairment Testing.

Common Mistakes

These are the most frequent errors students and practitioners make when accounting for bad debts:

1. Using the direct write-off method when GAAP requires the allowance method. The direct write-off method is acceptable only when uncollectible amounts are immaterial. For most companies with significant credit sales, the allowance method is required.

2. Confusing the adjusting entry amount with the ending allowance balance. The adjusting entry equals the required ending balance minus the existing allowance balance, not the required ending balance itself. Ignoring the pre-existing balance leads to an overstated allowance.

3. Debiting Bad Debt Expense when writing off a specific account. At write-off, debit Allowance for Doubtful Accounts — not Bad Debt Expense. The expense was already recognized in the earlier adjusting entry.

4. Assuming no allowance is needed because receivables are not yet past due. Under CECL (ASC 326), companies must estimate lifetime expected credit losses for all receivables — including current, performing balances. There is no “probable” recognition threshold.

Limitations of Bad Debt Estimation

1. Historical loss rates may not predict future defaults. Economic conditions, industry trends, and customer credit profiles change over time. An aging schedule built on five years of favorable conditions may severely understate losses during a recession.

2. CECL requires forward-looking judgment. The requirement to incorporate “reasonable and supportable forecasts” introduces subjectivity. Two equally competent analysts may produce materially different allowance estimates for the same receivable portfolio.

3. Earnings management risk. Companies can manipulate the allowance to smooth earnings — over-provisioning in strong years and releasing reserves in weak years. Regulators have scrutinized allowance practices at major institutions: SunTrust Banks restated its financial statements and disclosed material weaknesses in its allowance estimation controls, while post-financial-crisis reviews at institutions like Citigroup and Wells Fargo highlighted concerns about delayed or inadequate loss recognition.

4. Small sample sizes distort estimates. Newer companies or those with few credit customers may lack sufficient historical data to establish reliable loss percentages for each age bucket.