Bad debt
DEFINITION
Bad debt is the portion of accounts receivable a business does not expect to collect, typically because a customer is unable or unwilling to pay an outstanding balance.
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RELATED TERMS
Bad debt is the portion of accounts receivable a business does not expect to collect, typically because a customer is unable or unwilling to pay an outstanding balance. Once a receivable is judged uncollectible, it moves from an asset on the balance sheet to an expense on the income statement, reducing the revenue a company actually realizes from its sales.
For subscription businesses, bad debt shows up whenever a customer's balance goes unpaid long enough that collection is no longer expected, whether from a lapsed card, a disputed invoice, or a customer who has simply stopped responding. A subscription platform such as Recurly routes billing, retries, and dunning communications so that fewer failed payments turn into bad debt in the first place, and gives finance teams the receivable and payment data needed to estimate and track it accurately.
Why bad debt matters for subscription businesses
Bad debt directly reduces recognized revenue and distorts the picture of how healthy a subscription business's cash flow really is. A company can report strong bookings and still see margins erode if a meaningful share of billed revenue is never collected. Because subscription revenue is recurring, unresolved payment failures compound over time: a customer who misses one payment cycle is at elevated risk of missing the next, so bad debt and involuntary churn tend to move together.
Tracking bad debt also matters for financial reporting accuracy. Under accrual accounting, companies are expected to estimate and record bad debt expense in the same period as the related revenue rather than waiting to discover a specific unpaid invoice, so that reported revenue reflects what the business realistically expects to collect.
How to use bad debt
Finance and revenue operations teams use bad debt as both a monitoring metric and an input to broader financial controls:
Set an allowance for doubtful accounts policy and estimation method (see the calculation below) and apply it consistently period over period.
Monitor bad debt as a percentage of revenue or receivables over time to catch deterioration in payment quality early.
Segment bad debt by cause (failed card, disputed charge, unresponsive customer) to distinguish payment-recovery problems from credit or collections problems.
Feed dunning and payment-retry outcomes back into the bad debt estimate, since a stronger recovery process on failed payments should lower the eventual write-off rate.
Reconcile the allowance for doubtful accounts against actual write-offs each period to refine the estimation method going forward.
How to calculate bad debt expense
Bad debt expense is most often estimated using one of two standard allowance methods, both of which feed the allowance for doubtful accounts, a contra-asset account that reduces gross receivables to their estimated collectible value.
Percentage-of-sales method:
Bad debt expense = Total credit sales for the period x Estimated bad debt percentage
Aging-of-receivables method:
Required allowance balance = Sum across each aging bucket of (Receivables in that bucket x Estimated uncollectible percentage for that bucket)
Bad debt expense (aging method) = Required allowance balance - Existing allowance balance before adjustment
To apply either method:
Choose an estimation method (percentage-of-sales for simplicity, aging-of-receivables for more precision).
Gather the inputs: total credit sales for percentage-of-sales, or receivables grouped by how long they have been outstanding for aging-of-receivables.
Apply the estimated percentage or percentages to calculate the required bad debt expense or allowance balance.
Record the bad debt expense and increase the allowance for doubtful accounts by the same amount.
When a specific receivable is later confirmed uncollectible, write it off against the allowance rather than recording a new expense.
Illustrative example. Imagine a hypothetical subscription company with $500,000 in credit sales for the quarter and outstanding receivables broken into three aging buckets.
Using the percentage-of-sales method, if the company estimates that 2% of credit sales will ultimately prove uncollectible:
Bad debt expense = $500,000 x 2% = $10,000
Using the aging-of-receivables method, with the following buckets:
Current receivables: $200,000 at an estimated 1% uncollectible = $2,000
30 to 60 days past due: $50,000 at an estimated 10% uncollectible = $5,000
Over 60 days past due: $20,000 at an estimated 40% uncollectible = $8,000
Required allowance balance = $2,000 + $5,000 + $8,000 = $15,000
If the existing allowance balance before this adjustment was $3,000, the bad debt expense recorded for the period would be:
Bad debt expense = $15,000 - $3,000 = $12,000
Both figures above are hypothetical and used only to illustrate the mechanics of each method. A real company would choose one method consistently rather than run both in parallel.
Bad debt vs write-off
Bad debt and write-off are related but not the same thing, and the two terms are often used loosely in place of each other.
Bad debt is the broader accounting concept and the expense that appears on the income statement, representing management's estimate of receivables that will not be collected. A write-off is the specific bookkeeping action taken once a particular receivable is confirmed uncollectible: the balance is removed from accounts receivable and charged against the existing allowance for doubtful accounts. A company records bad debt expense to build its allowance in anticipation of losses, and later performs a write-off to clear a specific customer's balance once collection is no longer realistic. A company can carry bad debt expense in a period with no individual write-offs yet, and the reverse can also happen.
Benefits and examples
Actively managing bad debt gives subscription businesses several advantages:
More accurate revenue and margin reporting, since recognized revenue better reflects what will actually be collected.
Earlier warning signs of payment or credit quality problems, before they show up as larger write-offs later.
Better-informed credit and dunning policies, since bad debt trends by segment or payment method show where recovery efforts are falling short.
Cleaner financial statements for audits, investors, and lenders, since a well-supported allowance for doubtful accounts demonstrates disciplined estimation rather than reactive write-offs.
For example, a subscription business that segments bad debt by failure reason might find that expired cards account for a disproportionate share of eventual write-offs. Directing dunning efforts, such as automatic card updater services, at that segment specifically can reduce the resulting bad debt over time.
Frequently asked questions
What causes bad debt in a subscription business? Bad debt in a subscription business typically comes from failed or declined payments that are never successfully recovered, disputed charges that are not resolved in the merchant's favor, and customers who stop responding to payment requests while their subscription remains active.
Is bad debt the same as a chargeback? No. A chargeback is a specific dispute process initiated through a customer's card issuer that reverses a charge, while bad debt is an accounting estimate or write-off of receivables the company does not expect to collect through any means. A chargeback can be one source of bad debt but is not the only one.
How is bad debt expense reported on the financial statements? Bad debt expense appears on the income statement, typically within operating expenses, while the related allowance for doubtful accounts appears on the balance sheet as a contra-asset that reduces gross accounts receivable to its estimated collectible value.
Can better dunning reduce bad debt? Yes. Recovering a failed payment before it ages into an uncollectible balance keeps that revenue out of the bad debt calculation entirely, so stronger retry logic and payment recovery communications generally lower a company's overall bad debt rate.
Which allowance method should a subscription company use? There is no single correct answer. The percentage-of-sales method is simpler and ties directly to revenue, while the aging-of-receivables method is generally more precise because it accounts for how long specific balances have been outstanding. Many companies start with percentage-of-sales and move to aging as receivables volume and complexity grow.
