The allowance for doubtful accounts is a company’s estimate of the money owed by customers that it does not expect to collect. It sits on the balance sheet as a contra-asset account with a credit balance, reducing gross accounts receivable down to the amount the business realistically expects to turn into cash. Accountants call that reduced figure net realizable value, and it is the number lenders and investors actually rely on when they look at a company’s receivables.
Why the Allowance Exists
Booking the allowance upfront satisfies a core GAAP principle: expenses should land in the same period as the revenue they helped generate. When a company records $2 million in credit sales this quarter, some portion of those sales will never be paid. Estimating that loss now, rather than waiting months for a specific customer to default, keeps the income statement from overstating profit during growth periods. The Financial Accounting Standards Board requires this accrual approach for all entities following U.S. GAAP.
The mechanics are straightforward. Accounts receivable carries a debit balance representing money owed to the company. The allowance sits directly beneath it with a credit balance. If receivables total $1,500,000 and the allowance is $100,000, the balance sheet shows net receivables of $1,400,000. Recording the allowance also creates a bad debt expense on the income statement in the same period, which is the whole point of the exercise.
How the Allowance Shows Up on the Balance Sheet
Most companies present the allowance stacked directly under accounts receivable: gross receivables on top, minus the allowance, equals net receivables. That net figure flows into working capital and into every ratio built on current assets.
Two ratios in particular move with the allowance. The current ratio, current assets divided by current liabilities, drops when the allowance increases because net receivables shrink. The accounts receivable turnover ratio, net credit sales divided by average net receivables, shifts as well. A company carrying an unrealistically low allowance shows inflated receivables, which makes turnover look worse than it is while making the current ratio look better than it is. Analysts and creditors compare these numbers across companies in the same industry, so an allowance that drifts from reality distorts comparisons in both directions.
Methods for Estimating the Allowance
There is no single correct way to estimate the number. The right method depends on the size of the customer base, the stability of collection history, and whether the entity falls under the CECL standard. Most companies use one of four approaches, and larger organizations sometimes blend them.
Percentage of Sales
The simplest approach applies a fixed percentage to total credit sales for the period based on historical loss rates. A company generating $2,000,000 in credit sales with a track record of losing about 3% would record a $60,000 bad debt expense. The focus is on the income statement, matching estimated losses against the revenue that produced them. Its weakness is that it ignores the existing balance in the allowance account, so the balance sheet figure can drift if nobody reconciles it periodically.
Aging of Accounts Receivable
The aging method looks at how long individual invoices have been outstanding. Unpaid receivables get sorted into buckets, typically 0–30 days, 31–60 days, 61–90 days, and over 90 days past due. Older invoices carry higher estimated loss rates because collection probability drops with time. A company might apply 1% to current invoices and 40% to anything older than six months. The result is a target balance for the allowance, and the period’s bad debt expense is whatever adjustment brings the existing allowance up (or down) to that target. Auditors tend to prefer this method because it produces a more precise balance sheet valuation than percentage of sales.
Specific Identification
Companies with a manageable number of customers can evaluate individual accounts. An architectural firm with 50 clients might flag three: a developer in bankruptcy, a chronic late payer, and a customer in a legal dispute. The allowance equals the sum of those flagged balances. It is the most precise method and the most labor-intensive, and it becomes impractical once account counts run into the thousands.
Current Expected Credit Losses (CECL)
CECL, codified in FASB ASC Topic 326, replaced the older “incurred loss” model and is now the governing standard for most entities. Under the old model, a company booked a loss only when evidence showed a specific loss had already occurred. CECL requires estimating lifetime expected losses from the moment a receivable is recorded, taking into account past events, current conditions, and reasonable and supportable forecasts. If unemployment is rising or a major customer’s industry is contracting, those conditions factor into the estimate even if no payment has been missed. The standard also requires documentation of the assumptions and data behind the loss figure.1Board of Governors of the Federal Reserve System. Frequently Asked Questions on the New Accounting Standard on Financial Instruments–Credit Losses
Writing Off a Specific Account
A write-off happens when management concludes that a particular customer’s balance is genuinely uncollectible. The entry debits the allowance (reducing it) and credits accounts receivable (removing the specific debt). If a client owes $1,200 and files for bankruptcy, that $1,200 comes off the books through this entry.
Notice what does not happen: no new expense hits the income statement. The bad debt expense was already recorded in a prior period when the allowance was established. The write-off simply cleans up the balance sheet by removing an asset that no longer holds value. Gross receivables and the allowance both decrease by the same amount, so net receivables stay unchanged. Keeping the subsidiary ledger of individual customer accounts synchronized with the general ledger is critical here; if the two fall out of alignment, reconciliation during an audit becomes a mess.
When a Written-Off Account Pays
Sometimes a customer who was written off actually pays. You cannot just deposit the check, because the receivable no longer exists on the books. The fix is a two-step entry. First, reverse the original write-off by debiting accounts receivable and crediting the allowance, which reinstates the customer’s balance. Second, record the cash collection normally: debit cash, credit accounts receivable. The two steps preserve the audit trail so anyone reviewing the ledger can see what was written off, what was recovered, and when.
Recoveries also carry a tax consequence. Under the tax benefit rule, if the company deducted the bad debt in a prior year and later recovers all or part of it, the recovered amount is generally taxable income in the year received. Tax is owed only on the portion that actually reduced tax liability in the year the deduction was originally claimed. If the original deduction produced no tax benefit, the recovery can be excluded from gross income under the recovery exclusion.2eCFR. 26 CFR 1.111-1 – Recovery of Certain Items Previously Deducted or Credited
Why Your Tax Deduction Won’t Match the Book Expense
This is where most confusion arises. Under GAAP, companies estimate bad debts in advance using the allowance method and record an expense based on projected losses. The IRS does not accept that approach. For federal tax purposes, a company generally cannot deduct estimated future losses. Instead, a bad debt is deductible only when a specific debt becomes wholly or partially worthless. A debt is worthless when the facts and circumstances show no reasonable expectation of repayment, and the taxpayer must demonstrate reasonable steps to collect. A court judgment is not required if it can be shown a judgment would be uncollectible, but documentation is.3Internal Revenue Service. Topic No. 453, Bad Debt Deduction
The practical result is that book and tax figures almost always diverge in any given year. A company might book $100,000 in bad debt expense under the allowance method while deducting only $30,000 on the tax return because only $30,000 worth of specific debts became worthless. That gap creates a temporary difference tracked as a deferred tax asset. The underlying statute treats business bad debts, those tied to a trade or business, as ordinary losses that can be partially worthless.4Office of the Law Revision Counsel. 26 USC 166 Bad Debts
How Often to Review the Allowance
Most companies reassess the allowance at least quarterly, and public companies reporting under SEC rules effectively do so every time they issue financial statements. A proper review looks at recent collection experience, changes in customer creditworthiness, economic forecasts required under CECL, and any new information about specific accounts. The forward-looking forecast element means the allowance needs updating whenever economic conditions shift meaningfully, not just when customers start missing payments.
An allowance that is too low overstates assets and income, which can mislead investors and trigger restatements. One that is too high understates income and may draw scrutiny from auditors or regulators who suspect the company is building a reserve to smooth earnings in future periods. Neither outcome is harmless, and the right number comes from genuine analysis rather than rounding to a comfortable figure.