What it means
Under accrual accounting, revenue is recorded when a sale is made rather than when cash arrives, which means the accounts carry an asset that may never turn into money. Accounts uncollectible are the correction to that optimism, reducing receivables to what the business realistically expects to collect.
There are two accounting approaches. The direct write-off method removes a specific invoice when it is known to be bad, while the allowance method estimates future losses in advance and records them alongside the sales that created the risk, which is the treatment required for published financial statements.
The estimate is usually built one of two ways: a percentage of credit sales, or a bucket-by-bucket percentage applied to the ageing report. Both are estimates, both get refined as history accumulates, and both are reviewed closely by auditors because they directly affect reported profit.
The commercial nuance is that the right level of uncollectible accounts is not zero. A business with no bad debts at all is probably turning away creditworthy customers, so the goal is to keep losses within a level the gross margin comfortably absorbs.
It is worth understanding what a write-off actually costs. On a 25% gross margin, a $20,000 bad debt wipes out the profit on $80,000 of additional sales, which is why credit checks and deposits are usually far cheaper than chasing money after the event.
Writing an amount off in the books is also not the same as forgiving it. The debt still legally exists, collection efforts can continue, and any later recovery is credited back to profit as a bad debt recovered rather than treated as new revenue.
In practice
Real-world examples.
Example
An office furniture supplier learns that a customer owing $26,000 has entered administration with no assets. The invoice is written off, the receivable is removed and the allowance absorbs the loss without any surprise to that month's profit.
Example
A training company reviews 340 small unpaid invoices averaging $180 each. Legal recovery would cost more than the debts are worth, so the balances are written off and a card-on-file payment requirement is introduced for new bookings.
Example
An auditor questions a manufacturer whose allowance has stayed at exactly $50,000 for four consecutive years. The finance team rebuilds it from the ageing report, producing a more defensible $71,000 and a one-off charge to profit.
Formula
Calculation
Bad Debt Expense = required closing allowance - allowance balance remaining after write-offs
A building products distributor starts the year with an allowance for doubtful accounts of $30,000. During the year it writes off $18,000 of invoices from a customer that entered liquidation, leaving $30,000 - $18,000 = $12,000 in the allowance.
At year end its receivables stand at $600,000 and the ageing analysis indicates a required allowance of $45,000. The bad debt expense for the year is therefore $45,000 - $12,000 = $33,000.
That expense restores the allowance to $12,000 + $33,000 = $45,000, and receivables are presented net at $600,000 - $45,000 = $555,000. As a sense check, the distributor made $2,400,000 of credit sales, so the $33,000 charge represents about 1.4% of credit sales.Case study
Seen in the real world.
Brackenhill Tools is a fictional distributor used here purely for illustration. It sold on 30-day terms to independent hardware stores and carried a fixed allowance of 1% of receivables because that was the figure its first bookkeeper had chosen years earlier.
When a regional buying group collapsed, Brackenhill lost $214,000 across nine customers in a single quarter, against an allowance of just $38,000. The shortfall of $176,000 hit that quarter's profit directly and pushed the company into breach of a bank covenant.
The recovery involved three changes: credit limits based on external credit scores rather than trading history, an ageing-based allowance recalculated every month, and a concentration rule capping any single buying group at 8% of the ledger. Uncollectible accounts settled at around 0.9% of sales the following year, but the figure was now expected, provided for and priced into the margin.
Watch out
Common mistakes.
- Waiting until a debt is definitively lost before recognising any cost, which pushes the loss into the wrong period and overstates earlier profit.
- Setting the allowance as a flat percentage and never revisiting it as the customer mix and ageing profile change.
- Writing off a debt in the books and then abandoning collection efforts, when a written-off balance can still legitimately be pursued.
Questions
People also ask.
What is the difference between a doubtful debt and a bad debt?
A doubtful debt is one that might not be collected and is covered by an allowance, while a bad debt is one that has been accepted as lost and written off.
Does writing off a bad debt reduce tax?
Usually yes once the debt is genuinely irrecoverable, though tax authorities generally allow the deduction for specific write-offs rather than general allowances.
What level of uncollectible accounts is acceptable?
It varies widely by sector, but many businesses selling on credit budget for somewhere between 0.5% and 2% of credit sales.
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