What it means
Accounts are meant to show assets at what the business can realistically get out of them. When a customer goes into liquidation or a batch of stock passes its expiry date, the recorded value becomes fiction, and a write-off corrects it.
The entry reduces the asset and records an expense, so profit falls in the period the decision is made. There is a useful difference between a write-off and a write-down.
A write-down reduces an asset to a lower but still positive value, while a write-off takes it all the way to zero. Most businesses of any size do not wait until a debt is hopeless.
They maintain an allowance for doubtful debts, an estimate of the receivables that will never arrive, and charge the expense as soon as the risk appears. When a specific invoice is finally written off, it is removed against that allowance, so profit is unaffected at that moment because the hit was taken earlier.
Tax treatment does not automatically follow the accounts. Many tax authorities allow a deduction only once a debt is genuinely bad rather than merely doubtful, so the finance team often keeps a separate record for tax purposes.
A write-off is an accounting decision, not a legal one. The business can still chase the money, and if a written-off customer unexpectedly pays, the recovery is credited back to profit.
Writing off a debt should therefore never be treated as forgiving it.
In practice
Real-world examples.
Example
A food distributor discovers 4,000 cases of a chilled product were stored above temperature and cannot be sold. The $46,000 carrying value is written off to cost of sales in the month the problem is found, and the insurance claim is only recorded when the insurer confirms it.
Example
An acquisitive marketing group carries $6,000,000 of goodwill from an agency it bought three years ago. When the acquired team leaves and the client list follows them, the auditors require the goodwill to be written off in full, wiping out the reported profit for the year even though no cash moved.
Example
A telecoms reseller runs a monthly routine that writes off any consumer account still unpaid after 180 days. The written-off balances are passed to a collections agency, and the roughly 12% that is later recovered is credited back as other income.
Think of it
“A write-off is like accepting that money you lent to a friend is never coming back. You remove it from what you expect to receive.
Formula
Calculation
There is no single formula, but the balance sheet effect follows a fixed pattern: net receivables = gross receivables - allowance for doubtful debts, and a write-off reduces both of those figures by the same amount.
A design agency ends the quarter with gross trade receivables of $850,000 and an allowance for doubtful debts of $60,000, giving net receivables of $850,000 - $60,000 = $790,000. One client then enters administration owing $18,000, and the agency writes that invoice off.
Gross receivables fall to $850,000 - $18,000 = $832,000 and the allowance falls to $60,000 - $18,000 = $42,000. Net receivables are $832,000 - $42,000 = $790,000, exactly as before, because the expense was already recognised when the allowance was created. Had the agency kept no allowance at all, the full $18,000 would have hit this quarter's profit instead.Case study
Seen in the real world.
This is an illustrative, clearly fictional scenario. Lantern Bay Supplies, an invented builders merchant, had never maintained an allowance for doubtful debts because its founder believed it looked pessimistic to assume customers would not pay. Bad debts were simply written off when a customer failed, which meant profit was smooth for months and then suddenly collapsed whenever a builder went under.
In one fictional quarter, three small contractors failed within six weeks and Lantern Bay wrote off $340,000 in a single month, turning a forecast profit into a reported loss. The bank read the swing as instability rather than bad luck and reduced the overdraft facility just as trading picked up again.
The new finance manager introduced an allowance based on the ageing of the debt: 2% of invoices under 30 days, rising to 40% beyond 120 days. Profit became far less volatile, individual write-offs stopped being events, and the bank restored the facility at the following review.
Watch out
Common mistakes.
- Confusing a write-off with a write-down, and reporting an asset as worthless when its value has only fallen.
- Believing a write-off cancels the customer's legal obligation, so collection efforts are abandoned the moment the accounting entry is posted.
- Delaying write-offs to protect this period's profit, which leaves the balance sheet showing receivables everyone knows will never be collected.
Questions
People also ask.
Does a write-off cost the business cash?
No, the cash was lost when the customer failed to pay; the write-off simply recognises that fact in the accounts.
What happens if a written-off debt is later paid?
The recovery is credited to profit in the period the money arrives, usually as other income or a reduction in the bad debt expense.
Who should approve a write-off?
Most businesses set an authority limit, with routine small balances cleared by the credit controller and larger amounts requiring finance director or board sign-off.
From the founder's library
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