Bad Debt Expense and the Allowance for Doubtful Accounts: Calculation, Write-Offs, and Prevention

Bad debt is the one AR number that shows up directly in operating profit. A receivable that ages quietly for eleven months is a working capital problem; the moment it is judged uncollectible, it becomes a charge against earnings.

Yet in many finance teams the bad debt provision is one of the least rigorous numbers produced all year — a percentage carried forward from last year’s working papers, adjusted by instinct, then defended in the audit because nobody has a better method. Auditors have become markedly less tolerant of that approach under current expected credit loss standards.

This guide covers what bad debt expense is, how to calculate it using each accepted method, the journal entries for provisioning, write-off and recovery, and how to reduce the underlying number rather than just estimate it more precisely.

Bad Debt Expense vs. the Allowance for Doubtful Accounts

These two terms describe the same event from different statements, and conflating them causes most of the confusion in this area.

• Bad debt expense is an income statement account. It records the cost of expected non-collection in the period the estimate is made.
• The allowance for doubtful accounts is a balance sheet account — specifically a contra-asset that sits against accounts receivable and reduces it to net realisable value.

The relationship is straightforward: when you increase the allowance, the other side of that entry is bad debt expense. The allowance is a running balance; bad debt expense is the periodic movement in it.

So if gross AR is $4,000,000 and the allowance is $180,000, the balance sheet presents net receivables of $3,820,000 — the amount management genuinely expects to collect.

The Allowance Method vs. the Direct Write-Off Method

There are two ways to account for bad debt, and only one is generally acceptable for financial reporting.

The Direct Write-Off Method

The invoice is expensed only when it is specifically identified as uncollectible. No estimate, no allowance.

This is simple and is what the US tax code requires for deductibility, but it is not GAAP or IFRS compliant for financial reporting, because it violates the matching principle. Revenue is recognised in one period and the associated loss lands in another — often a year or more later — which distorts both periods.

It is acceptable only where bad debt is immaterial.

The Allowance Method

The business estimates uncollectible amounts in the same period the revenue is recognised, creating an allowance. Specific write-offs are then charged against that allowance rather than against earnings.

This is required under both US GAAP (ASC 326, the CECL model) and IFRS (IFRS 9, expected credit loss). Both standards are forward-looking: the estimate must reflect not only historical loss experience but also current conditions and reasonable forecasts of future conditions. A provision rate based purely on a three-year historical average, with no consideration of current customer risk or economic outlook, is the specific practice these standards were written to eliminate.

How to Calculate Bad Debt Expense

Three methods are in common use, in ascending order of rigour.

1. Percentage of Sales Method

An income-statement approach: a fixed percentage of credit sales is charged to bad debt expense each period.

Bad Debt Expense = Total Credit Sales x Historical Bad Debt Rate

If credit sales are $8,000,000 and the historical loss rate is 0.6%, bad debt expense is $48,000. This amount is added to the existing allowance balance rather than replacing it.

It is simple and works for interim reporting, but it ignores the actual condition of the receivable book. Two companies with identical sales and wildly different aging profiles would book the same expense, which is why it rarely survives as a year-end method on its own.

2. Percentage of Receivables Method

A balance-sheet approach: the required ending balance of the allowance is calculated as a percentage of closing AR.

Required Allowance Balance = Ending Accounts Receivable x Estimated Loss Rate
Bad Debt Expense = Required Allowance Balance - Existing Allowance Balance

The critical difference from the sales method is that this calculates a target balance, so the expense is the adjustment needed to reach it. If the required allowance is $180,000 and $110,000 already sits in the account, the expense for the period is $70,000.

3. The Aging Method (Recommended)

The most defensible approach, and the one that aligns most naturally with CECL and IFRS 9. It applies escalating loss rates to each bucket of the accounts receivable aging report, reflecting the reality that collection probability falls sharply with age.

The loss rates must be derived from your own historical roll-rate data — the observed percentage of balances in each bucket that ultimately went uncollected — then adjusted for current conditions and forward-looking factors. Borrowed benchmark rates are the first thing an auditor will challenge.

Two refinements materially improve accuracy:

Segment the matrix. Loss rates often differ substantially by customer segment, geography, or product line. A single blended matrix across a diverse portfolio can mask offsetting errors.

Carve out specific identified risks. Where a particular customer is known to be in distress, that balance should be provided for specifically at an appropriate rate and excluded from the general matrix, rather than being diluted inside a bucket average.

The Journal Entries

Recording the provision

To establish or increase the allowance:

Dr  Bad Debt Expense              70,000
    Cr  Allowance for Doubtful Accounts    70,000

Writing off a specific invoice

When a specific balance is confirmed uncollectible:

Dr  Allowance for Doubtful Accounts    24,000
    Cr  Accounts Receivable                    24,000

This is the entry most often misunderstood. Under the allowance method, a write-off has no effect on the income statement and no effect on net receivables — it reduces gross AR and the allowance by the same amount. The expense was already recognised when the allowance was raised. If writing off an invoice changes your profit, you are on the direct write-off method.

Recovering a written-off balance

If a customer later pays an amount previously written off, reverse the write-off and then record the cash:

Dr  Accounts Receivable          24,000
    Cr  Allowance for Doubtful Accounts    24,000

Dr  Cash                         24,000
    Cr  Accounts Receivable                24,000

Recoveries are more common than most teams assume, particularly where write-off was triggered by an aging policy rather than a confirmed insolvency.

When Should an Invoice Actually Be Written Off?

Write-off is an accounting judgement, not an automatic function of age. A balance should generally be written off when collection efforts are genuinely exhausted and one or more of the following applies:

• The customer has entered insolvency, liquidation, or administration and the expected dividend is negligible
• The debt is time-barred under the applicable statute of limitations
• The cost of further recovery credibly exceeds the expected amount recovered
• The customer cannot be located after documented attempts
• A commercial settlement has been reached for a lesser amount, with the balance forgiven

Critically, a balance should not be written off simply because it has passed an age threshold, and it should never be written off while it remains disputed. A disputed invoice is not uncollectible — it is unresolved. Writing it off converts a solvable commercial problem into a permanent loss and removes any incentive to fix the underlying billing error.

Every write-off should carry documented evidence of the collection steps taken, dated approval at an authority level proportional to the amount, and a record of the reason code. Auditors test write-offs for exactly this, and the pattern of reason codes is itself management information: a cluster of write-offs coded “billing dispute unresolved” is a process failure, not a credit failure.

Reducing Bad Debt Structurally

Improving the estimate changes reported numbers. Reducing the underlying loss changes the business. Bad debt is a lagging indicator of failures that occurred much earlier in the order-to-cash cycle.

Control exposure at origination. The majority of large write-offs trace back to credit that was extended too generously or never reviewed as the customer deteriorated. Disciplined B2B credit management — scored limits, scheduled reviews, and event-triggered reassessment — is the single highest-leverage intervention available.

Detect deterioration earlier. Days-to-pay drift, broken promises to pay, rising disputes, and partial payments where full payment was previously standard all precede default by months. These signals exist in your own data and are usually noticed too late because nobody aggregates them.

Collect earlier and more consistently. Loss rates escalate steeply with age, as the matrix above shows. A structured dunning process that begins before the due date and escalates on a defined schedule moves balances out of the high-loss buckets. Where email-only follow-up has plateaued, AI voice agents extend consistent outbound contact across the whole portfolio rather than only the largest accounts.

Resolve disputes as a separate workflow. Disputed invoices that sit in collections queues age into the 90+ bucket and eventually get written off despite being entirely recoverable. They need an owner, a resolution path, and a clock — a credit note issued in week two costs far less than a write-off in month eleven.

Ensure invoices are actually delivered. A surprising share of aged balances are invoices that never reached the customer’s approval workflow. Reliable delivery and a self-service customer portal remove an entire category of avoidable aging.

Keep the receivable ledger accurate. Unapplied cash makes balances look overdue when payment has already arrived, distorting both the aging matrix and the provision. Automated cash application and reconciliation keeps the data the provision is built on trustworthy.

How to Calculate and Manage Bad Debt Expense

Step 1: Produce a clean aging report. Buckets from due date, cash fully applied, disputes separated.

Step 2: Derive loss rates from your own roll rates. Borrowed benchmarks are the first thing challenged in audit.

Step 3: Adjust for current and forward-looking conditions. This is the explicit requirement of both CECL and IFRS 9.

Step 4: Apply the matrix and carve out specific risks. Known distressed customers are provided for individually.

Step 5: Book the expense as the movement in the allowance. Not the balance itself.

Step 6: Attack root causes. Reason-code your write-offs and fix what they reveal.

Our Verdict: Provisioning Accuracy and Loss Reduction Are Different Projects

It is worth being explicit about something that gets conflated: improving your bad debt estimate and reducing your bad debt are separate pieces of work with separate owners. A more rigorous aging matrix produces financial statements that are correct and defensible in audit. It does not recover a single dollar. Teams that invest heavily in provisioning methodology while leaving credit review and collections unchanged end up precisely quantifying a loss they are still incurring.

Both matter, but they should be resourced accordingly. On the estimate side, the defensible approach applies loss rates derived from your own historical roll rates to each aging bucket, adjusted for current and forward-looking conditions, with distressed customers carved out and provided for individually rather than diluted inside a bucket average. On the loss side, the highest-return interventions sit far upstream: disciplined credit limits with scheduled review, structured collections that begin before the due date, and dispute resolution treated as a workflow distinct from chasing.

The standards themselves are unambiguous about the forward-looking requirement. Both IFRS 9 as issued by the IFRS Foundation and the current expected credit loss model under FASB require estimates to reflect reasonable forecasts rather than historical averages alone, and technical interpretation from Deloitte and guidance from AICPA & CIMA is where most practitioners turn for application detail. Reason-coding your write-offs is what connects the two halves of the problem, because the distribution of causes tells you whether losses originate in credit decisions, unresolved disputes, or undelivered invoices.

Conclusion

A well-built provision makes your financial statements accurate. It does nothing for the cash. The teams that structurally reduce bad debt are the ones that treat it as the final symptom of upstream decisions — credit extended without review, disputes left unresolved, invoices never delivered, and follow-up that started too late and stopped at email.

Request a demo to see how Peakflo connects credit exposure, real-time AR reporting, and automated collections across the full accounts receivable lifecycle.

Frequently Asked Questions

What is bad debt expense?

Bad debt expense is the cost recognised on the income statement when a business estimates that some portion of its accounts receivable will not be collected. Under the allowance method required by GAAP and IFRS, it is recorded in the same period as the related revenue rather than waiting until a specific invoice fails.

How do you calculate bad debt expense?

The most defensible method is the aging method: apply escalating loss rates to each accounts receivable aging bucket to calculate the required allowance balance, then record bad debt expense as the difference between that required balance and the existing allowance. Simpler alternatives apply a flat percentage to credit sales or to total receivables.

Is the allowance for doubtful accounts an asset?

No. It is a contra-asset account — it sits within the asset section but carries a credit balance and reduces gross accounts receivable to the net amount expected to be collected. If gross AR is $4,000,000 and the allowance is $180,000, net receivables presented on the balance sheet are $3,820,000.

Is bad debt expense an operating expense?

Yes, in most presentations bad debt expense is classified as an operating expense, typically within selling, general and administrative costs, because extending trade credit is part of normal operations. Some businesses present it as a separate line within operating expenses when the amount is material.

How do you write off bad debt?

Under the allowance method, debit the allowance for doubtful accounts and credit accounts receivable for the specific invoice amount. This reduces gross receivables and the allowance equally, so it has no effect on the income statement or on net receivables — the expense was already recognised when the allowance was raised.

What is the difference between the allowance method and the direct write-off method?

The allowance method estimates uncollectible amounts in the same period revenue is recognised and is required under GAAP and IFRS. The direct write-off method expenses invoices only when specifically identified as uncollectible; it is simpler and required for US tax purposes, but violates the matching principle and is not acceptable for financial reporting unless amounts are immaterial.

When should you write off an unpaid invoice?

Write off when recovery efforts are genuinely exhausted — the customer is insolvent, the debt is time-barred, the customer cannot be located, or further recovery would cost more than it returns. Never write off a balance solely because it has reached an age threshold, and never write off an invoice that is still under dispute, since a dispute is unresolved rather than uncollectible.

Can a written-off debt be recovered later?

Yes. If a customer pays a previously written-off balance, reverse the original write-off by debiting accounts receivable and crediting the allowance, then record the cash receipt normally. Recoveries are reasonably common where the write-off was driven by an aging policy rather than a confirmed insolvency.

What is the journal entry to record bad debt expense?

To establish or increase the provision, debit bad debt expense and credit the allowance for doubtful accounts by the movement required. The expense recorded is the difference between the allowance balance the calculation requires and the balance already sitting in the account, not the full required balance.

Does writing off an invoice affect profit?

Under the allowance method, no. Writing off a specific invoice debits the allowance and credits accounts receivable, reducing gross receivables and the allowance equally with no income statement impact, because the expense was recognised when the allowance was raised. If a write-off changes your profit, you are using the direct write-off method.

How do you calculate loss rates for an aging matrix?

Derive them from your own historical roll rates — the observed percentage of balances in each aging bucket that ultimately went uncollected across several years — then adjust for current conditions and reasonable forecasts as both IFRS 9 and CECL require. Borrowed benchmark percentages that cannot be traced to internal experience are the first thing auditors challenge.