Bad Debts are uncollectible amounts owed by customers — money a business extended as credit that it will, realistically, never collect. Bad Debts Expense is the loss due to uncollectible accounts. Because of the matching principle, a business cannot wait until a customer's account is officially declared uncollectible (which could be a year or more later) to record the expense — the expense has to be ESTIMATED and recorded in the same period as the related credit sales. This is the allowance method: instead of guessing which specific customer will not pay, the business estimates a total dollar amount and sets up an Allowance for Uncollectible Accounts (a contra-asset to Accounts Receivable).
- Uses a percentage of net sales as a basis for estimated bad debts expense
- Focuses on matching the expense to the revenue that caused it
- Bad Debts Expense = Net Sales × estimated %
- Simple to apply; ignores any existing Allowance balance
- Uses a percentage of accounts receivable as a basis for estimating bad debts expense
- Focuses on getting the Allowance account balance exactly right at period end
- Required Allowance balance = Accounts Receivable × estimated %
- Bad Debts Expense = required balance − existing Allowance balance
A more precise version of the balance sheet method is an Accounts Receivable Age Analysis — a list of balances owed by each customer and how long the balance has been owed, with older balances assigned a much higher estimated uncollectible percentage than fresh ones, since the longer a debt sits unpaid, the less likely it is ever to be collected.
Net Realizable Accounts Receivable is accounts receivable less estimated bad debts — the honest, realistic value of what a business actually expects to collect, shown on the balance sheet instead of the raw (overstated) total owed by customers.
Writing off an account
When a specific customer's account is finally confirmed uncollectible (bankruptcy, for example), it is written off: Dr Allowance for Uncollectible Accounts / Cr Accounts Receivable—[Customer]. Notice this entry does NOT touch Bad Debts Expense at all — the expense was already recorded back when the allowance was originally estimated. A write-off also does not change Net Realizable Accounts Receivable, because both Accounts Receivable and the Allowance shrink by the exact same amount.