As your business grows, your finance team will occasionally need to remove impaired balances from your general ledger.
What is a write-off?
In accounting, a write-off reflects an expense that reduces your taxable trading profits. For a company paying the main 25% UK Corporation Tax rate, writing off a £1,000 bad debt reduces your company's tax liability by £250, leaving your business to absorb the remaining £750 as an unrecovered economic loss.
Clearing uncollectible balances ensures your management accounts give you and your leadership team a true view of performance, rather than showing assets that cannot actually be realised.
Common types of write-offs
You will encounter several situations where your team must adjust ledger balances to reflect practical commercial realities.
Bad debts and unpaid invoices
Unpaid customer balances represent one of the most common triggers for financial adjustments. When your credit control efforts fail and an invoice appears irrecoverable, your team writes off the outstanding balance in accounts receivable as a bad debt expense.
Obsolete inventory and damaged assets
Physical stock can lose commercial value when items are damaged in transit, spoiled, or superseded by newer product lines. When stock cannot be sold or reworked, the inventory is written off by debiting a separate inventory expense or loss on inventory write-off account and crediting the inventory asset account, though immaterial amounts may be debited directly to cost of goods sold.
Scrapped capital equipment
Tangible equipment such as servers, manufacturing machinery, or office furniture can reach the end of its operational life or suffer irreparable breakdown. When you abandon or discard a fixed asset for zero proceeds, any remaining carrying value after accumulated depreciation is derecognised from the balance sheet.
How to record write-offs in accounting
Recording a write-off involves standard ledger entries to update your asset balances and reflect incurred expenses.
To write off an irrecoverable customer balance, your finance team credits trade debtors on the balance sheet and debits bad debts expense in the profit and loss account. For example, consider an overdue invoice of £1,200 consisting of £1,000 net sales and £200 value added tax (VAT). The initial entries are:
- Debit: Bad Debts Expense (P&L) £1,000
- Debit: VAT Bad Debt Relief Control Account (Balance Sheet) £200
- Credit: Trade Debtors / Accounts Receivable (Balance Sheet) £1,200
For a fully depreciated asset with zero proceeds from disposal, the accounting entry debits accumulated depreciation and credits the fixed asset account, removing the historical cost and accumulated reserve simultaneously.
Write-off vs. write-down
Although your team will encounter both terms, they reflect distinct accounting adjustments.
In financial reporting, a write-off addresses assets such as irrecoverable customer invoices by clearing the balance from the ledger entirely.
By contrast, an inventory adjustment or write-down reflects a partial adjustment rather than total removal. For example, if seasonal merchandise that cost £50,000 can only be sold for £20,000 net of clearance costs, your business writes down the inventory by £30,000 while retaining the stock on the balance sheet.
Tax implications of write-offs
UK tax rules distinguish your commercial ledger entries from statutory tax allowances. Your team must understand how tax deductions apply under HM Revenue and Customs (HMRC) guidelines.
Corporation Tax on bad debts
Under HMRC guidance (including BIM42705 and BIM42710), bad debt deductions for corporate money debts are governed by the loan relationships regime under Part 5 of the Corporation Tax Act 2009. HMRC allows businesses to claim tax deductions for bad debts in respect of trade receipts (which had they been received would have been taxable receipts).
Corporation Tax relief for bad debts is not strictly limited to formal insolvency or administration; relief can also be obtained for a reasonable doubtful debt provision built up from a debt-by-debt review of the debtor ledger evaluating recoverability.
Capital allowances on scrapped assets
Tax relief for qualifying capital expenditure may be given through statutory Capital Allowances instead of accounting depreciation.
Under Section 61 of the Capital Allowances Act 2001, scrapping plant or machinery for nil proceeds constitutes a disposal event. If an asset sits in your general capital allowance pool, its unrelieved expenditure remains in the pool and continues to attract annual writing-down allowances. If the item was allocated to a single-asset pool, scrapping it produces a balancing allowance that offsets trading profit in that accounting period.
VAT bad debt relief
Under HMRC VAT Notice 700/18, suppliers using standard accrual accounting who have remitted output VAT to HMRC on uncollected sales invoices can reclaim that tax. To qualify for VAT Bad Debt Relief:
- The debt must be written off in the company's accounting records.
- The invoice must have remained unpaid for at least six months from the later of the date payment was due and payable or the date of supply.
- The claim must be submitted within four years and six months of the later of the date when the amount became due and payable or the date of supply.
Eligible claims are entered into Box 4 of the VAT return. Under Section 26A of the Value Added Tax Act 1994, a reciprocal rule applies to buyers: a VAT-registered business that claims input tax on a supplier invoice must repay that VAT to HMRC if the bill remains unpaid after six months.
Strategic benefits of write-offs
Processing timely write-offs provides clear operational advantages for your business.
First, they preserve ledger accuracy. Carrying uncollectible receivables or unsellable stock distorts metrics such as working capital and current ratios, which can mislead lenders and internal leadership.
Second, write-offs protect your cash flow. Delaying the write-off of an uncollectible £50,000 debt prevents a business from reclaiming VAT previously paid to HMRC via VAT Bad Debt Relief. Timely recognition ensures your business reclaims eligible tax amounts promptly.
Finally, monitoring write-offs highlights commercial risks. Tracking bad debt patterns across customer segments helps your credit control team refine payment terms and manage exposure before losses accumulate.