Bad debt expense is the cost a business records when money owed by customers becomes uncollectible. It is the accounting recognition that some credit sales will never be paid, recorded as an expense on the income statement. It turns an optimistic accounts receivable balance into a realistic one, so your books reflect the cash you will actually collect rather than the full amount invoiced.
Every business that sells on credit carries some risk of non-payment, and bad debt expense is how that risk is put into the numbers. Recording it keeps your profit honest and your receivables believable, which matters for tax, for lenders, and for your own decisions about who to extend credit to.
It is the cost of unpaid invoices.The portion of credit sales a business does not expect to collect.
Two main methods.Estimate it as a percentage of sales, or from an aging of receivables.
It keeps profit honest.Recording it stops your receivables and earnings from being overstated.
The accounting logic comes from the matching principle: the cost of an unpaid sale should land in the same period as the sale that created it. If you booked the revenue this quarter, you should recognise the likely loss this quarter too, so profit reflects the real economics. Skipping this leaves accounts receivable overstated and earnings flattered, which is exactly the gap that catches businesses out when the cash does not arrive.
The most common approach is the percentage-of-sales method: multiply your credit sales for the period by an estimated bad debt rate based on past experience. Enter your figures below to estimate the expense.
Set the rate from your own write-off history. General information, not financial advice.
Worked example: 400,000 in credit sales at a 2% bad debt rate gives an 8,000 bad debt expense. The hardest part is the rate, not the arithmetic, so base it on your actual write-off history over the last few years rather than a guess, and revisit it as conditions change. For a method based on how overdue each invoice is, use the bad debt expense calculator, which applies different rates to each aging bucket. Most of this risk can be reduced upstream with steady collections through AR automation.
There are two standard ways to estimate bad debt expense: the percentage-of-sales method and the aging-of-receivables method. Both produce an allowance for the losses you expect, but they look at the problem from different angles.
| Method | How it works | Best for |
|---|---|---|
| Percentage of sales | Apply a fixed bad debt rate to credit sales for the period. | Quick income-statement estimates |
| Aging of receivables | Apply higher rates to older overdue buckets, then sum the result. | Accurate balance-sheet allowance |
The percentage-of-sales method is simple and ties the expense to revenue, which suits quick monthly estimates. The aging method is more precise because it recognises that a 90-day overdue invoice is far more likely to default than a current one, so it produces a better allowance for doubtful accounts. Many businesses use percentage-of-sales through the year and reconcile to an aging at period end.
An aging example shows why old invoices dominate the number. Suppose you have 50,000 of current receivables at a 1% expected loss, 20,000 at 31 to 60 days at 5%, and 10,000 over 90 days at 30%. That is 500 plus 1,000 plus 3,000, a required allowance of 4,500. Notice how the small, deeply overdue bucket drives most of the number: the 10,000 that is more than 90 days late contributes more than the 50,000 that is current. That is the insight the percentage-of-sales method misses, and it is why the aging approach is preferred when you want the balance sheet to be right rather than just quick.
Under the allowance method, you record bad debt expense by debiting bad debt expense and crediting the allowance for doubtful accounts, a contra-asset that reduces net receivables. No specific customer is named yet, because this is an estimate of future losses. The entry then plays out in two steps.
Debit bad debt expense and credit the allowance for doubtful accounts for the losses you expect this period. No customer is named yet.
When a specific invoice is confirmed uncollectible, debit the allowance and credit accounts receivable, removing the invoice without touching the expense again.
This two-step approach is what keeps the loss in the same period as the sale, satisfying the matching principle. Smaller businesses sometimes use the simpler direct write-off method instead, recording the expense only when a specific invoice is abandoned. The trade-off is timing: the direct method is easier but can push the loss into a later period than the sale, which overstates earlier profit and is generally not accepted under accrual accounting standards for material amounts. For that reason most businesses of any size use the allowance method, keeping the direct write-off for genuinely immaterial one-offs.
Bad debt expense is the cost on the income statement; the allowance for doubtful accounts is the related running balance on the balance sheet. They are two sides of the same estimate, as the table sets out.
| Aspect | Bad debt expense | Allowance for doubtful accounts |
|---|---|---|
| Where it sits | The income statement. | The balance sheet, against receivables. |
| What it shows | The cost recognised this period. | The running balance of expected losses. |
| Effect of a write-off | No fresh expense is created. | The balance is reduced by the write-off. |
The expense hits your profit for the period, while the allowance sits against accounts receivable and reduces it to the amount you realistically expect to collect. When you eventually write off a confirmed bad debt, it reduces the allowance rather than creating a fresh expense, which is why a well-maintained allowance smooths the impact of write-offs. A debt that is fully abandoned is often called a charge-off, and the receivables behind it are uncollectible accounts.
One more wrinkle: occasionally a written-off debt is later paid. When that happens you simply reverse the write-off and record the cash, which is a pleasant surprise rather than new revenue. The point of the allowance system is that none of these movements need to disturb the expense you already recognised, so your reported profit stays stable even as individual accounts resolve over time.
The cheapest bad debt is the one you never incur, so the best way to lower the expense is to stop invoices going bad in the first place. Two habits do most of the work: screen credit before you grant it, and then collect consistently afterwards.
Check credit firstRun a credit check before you extend terms, and set sensible limits for each customer.
Make terms clearSpell out payment terms up front so there are no disputes to stall the invoice later.
Invoice and remind promptlySend invoices fast and chase before and after the due date, not weeks later.
Escalate slipping accountsAct on overdue accounts before they age into the high-risk buckets where most write-offs come from.
The longer an invoice is overdue, the less likely it is to ever be paid, which is precisely why fast, reliable follow-up is the single most effective defence. Automating that follow-up with Paidnice AR automation inside Xero and QuickBooks means every account is chased on schedule, shrinking the overdue tail that turns into bad debt.
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