Bad Debt: Definition, Expense & Write-Offs

What Is Bad Debt?

Bad debt is money a company billed and recognized as revenue but will not collect. It arises when a customer becomes insolvent, disputes an invoice past the point of recovery, or simply stops paying. Accounting treats bad debt as an expense that reduces the carrying value of accounts receivable.

How Bad Debt Works

Bad debt is not a single event. An invoice passes its due date, enters the aging schedule, and moves through dunning reminders, a collections call, an escalation to the customer's finance leadership, and eventually a third party agency or legal demand. At some point the cost of chasing exceeds the probability weighted value of the balance, and finance writes it off.

There are two accounting methods. The direct write-off method removes the receivable in the period the company gives up on it. It is simple, but it violates the matching principle because the revenue and the loss land in different periods, so it is acceptable under GAAP only when the amounts are immaterial. The allowance method estimates uncollectible balances in the same period the revenue is booked, records bad debt expense on the income statement, and builds an allowance for doubtful accounts as a contra asset against accounts receivable. Banks and lenders use the term charge-off for the same idea applied to loans.

Writing an account off does not extinguish the obligation. The customer still owes the money, and if they later pay, the company reverses part of the allowance and records a recovery.

How to Calculate Bad Debt Ratio and the Allowance

The bad debt ratio expresses uncollectible amounts as a share of credit sales.

Formula: (Bad Debt Expense / Total Credit Sales) x 100

A company with $180,000 of bad debt expense on $12,000,000 of credit sales has a bad debt ratio of 1.5 percent. The direction matters more than the level. A ratio drifting from 0.6 percent to 1.5 percent over four quarters says credit standards loosened, collections slipped, or the customer mix moved down market.

The allowance is usually built from the aging schedule, applying a loss rate to each bucket based on the company's own collection history. Apply 0.5 percent to $2,000,000 of current receivables, 2 percent to $600,000 at 1 to 30 days past due, 10 percent to $250,000 at 31 to 60 days, 25 percent to $120,000 at 61 to 90 days, and 50 percent to $80,000 beyond 90 days. That yields $10,000 plus $12,000 plus $25,000 plus $30,000 plus $40,000, an allowance of $117,000 against $3,050,000 of gross receivables, or 3.8 percent.

Bad Debt in Plain English

Bad debt is revenue you booked, forecast, and paid commission on that never turns into money. The accounting entry is a formality. The real loss happened earlier, when someone extended terms to a customer who could not or would not pay, and nobody priced that risk into the deal.

Why the Aging Schedule Predicts Bad Debt

Collectability falls sharply with age. An invoice 15 days past due is usually a processing delay. An invoice 120 days past due is usually a dispute nobody resolved or a customer in trouble. That is why the aging schedule, not the total receivables number, is the useful early warning: the balance can stay flat while the mix rots underneath it.

Two patterns deserve immediate attention. The first is a single account drifting steadily rightward across buckets, which almost always means an unresolved dispute or a deteriorating business. The second is concentration, where one customer holds a large share of the past due balance. A 4 percent bad debt ratio spread across 300 customers is a pricing problem. The same ratio sitting in two accounts is a credit risk problem.

Why Bad Debt Is a Credit Decision, Not a Collections Problem

By the time an invoice is 90 days past due, the outcome was largely determined months earlier, when the company agreed to terms without checking whether the buyer could support them. Collections teams inherit decisions made in the sales process.

The incentive structure makes this worse. Sellers are paid on bookings, not on cash collected, so extending generous terms to a marginal buyer is rational for the individual and expensive for the company. Firms that keep bad debt low tend to do three unglamorous things: run a credit check before offering terms above a threshold, cap exposure per customer, and tie some portion of variable compensation to collected revenue rather than signed contract value.

Bad Debt and the Closing Motion

Bad debt is the Collect stage failing, and the failure usually starts at Propose. A seller offers net terms without underwriting, books the revenue, and discovers the credit quality of the buyer only when the invoice ages out. Ratio moves that question forward. With Ratio Trade the buyer is underwritten before the deal closes, the seller collects the full contract value upfront, and Ratio manages the monthly or quarterly payment schedule from there. The seller's cash is no longer contingent on a buyer's payment behavior stretching across the contract term. Bad debt does not vanish from the economy, but it stops being a surprise the seller absorbs at the end of a Renew cycle.

Common Questions About Bad Debt

Is bad debt an expense or a contra asset?

Both, in different places. Bad debt expense appears on the income statement and reduces net income in the period it is recorded. The allowance for doubtful accounts is the matching contra asset on the balance sheet, netted against gross accounts receivable to show expected collectible value.

What counts as a normal bad debt ratio?

It depends heavily on customer mix. B2B software selling to enterprise buyers commonly runs well under 1 percent of revenue, while books weighted toward small businesses often run several times that. Compare your ratio against your own trailing four quarters before comparing it to anyone else.

Can bad debt be recovered after a write-off?

Yes. Recoveries happen through settlements, bankruptcy distributions, or a customer returning to good standing. The entry reinstates the receivable and records the cash, and the recovery rate on written-off balances is worth tracking because it tells you whether write-offs are happening too early.

Bad Debt