A bad debt is an outstanding balance owed by a customer that a business determines is uncollectible. In business-to-business commerce, selling goods or services on credit creates accounts receivable, representing money earned but not yet received. When a customer enters liquidation, falls into administration, or ceases trading, that receivable ceases to be an asset.
Failing to collect payment affects more than just top-line performance. It directly drains working capital and distorts financial statements. When invoices remain unpaid indefinitely, businesses turn to formal bad debt accounting to recognise the loss and maintain accurate records.
What is bad debt?
When an invoice remains unpaid, businesses assess whether it should be classified as a bad debt. For statutory tax deduction rules governing bad and doubtful debts, businesses can consult official HMRC manuals for specific criteria.
Leaving an uncollectible balance on the ledger overstates your assets and creates a misleading picture of your financial health. Removing the balance ensures that your balance sheet reflects genuine assets, while charging a bad debt expense against your profit and loss account to reflect the economic reality of the transaction.
Bad debt vs. doubtful debt
While finance teams often mention them together, bad debt and doubtful debt represent two distinct stages of credit risk:
- Doubtful debt: An account receivable where full payment is uncertain, but not yet impossible. A customer experiencing cash flow difficulties or disputing an invoice might prompt the finance team to assess the expected shortfall.
- Bad debt: A debt that is treated as irrecoverable. The customer may have ceased trading or entered compulsory liquidation with no assets remaining. Rather than remaining doubtful, the debt is written off.
Why bad debts occur in business
Unpaid invoices rarely happen in isolation. They are often the result of broader economic pressures, procedural gaps in credit control, or customer insolvency. According to research from the Department for Business & Trade and the Federation of Small Businesses, delayed payments cost small businesses an average of £22,000 annually.
Key drivers of bad debt include:
- Insolvency and business failure: Formal insolvency procedures such as administration or liquidation may leave suppliers unable to collect outstanding invoice balances.
- Supply chain contagion: According to the Federation of Small Businesses, 36% of UK SMEs unable to collect payments from customers are subsequently unable to pay their own suppliers on time.
- Disputes and administrative errors: Unclear scopes of work, pricing discrepancies, or missing purchase order numbers can delay payment until an invoice becomes uncollectible.
- Widespread late payments: According to research by the Federation of Small Businesses, between 60% and 70% of small businesses are affected by late payments each quarter.
Accounting for bad debt
Under UK accounting practice, finance teams routinely review trade receivables to ensure ledgers present an accurate view of debtor recoverability, referring to official UK accounting standards for specific impairment rules.
Bad debt write-offs and journal entries
In credit management, writing off a debt formally derecognises a balance that cannot be collected. In standard double entry bookkeeping, the transaction removes the customer balance from the sales ledger and records an operating expense.
When writing off an uncollectible balance where no prior provision exists, the finance team typically records the following journal entry:
- Debit: Bad Debt Expense in the profit and loss account.
- Credit: Accounts Receivable / Trade Debtors in the general ledger.
This adjustment reduces net profit and updates trade receivables to reflect only collectable amounts.
Understanding bad debt provisions
When a debt is doubtful rather than fully irrecoverable, businesses often establish an impairment allowance (historically termed an allowance or provision for doubtful debts). This contra-asset account sits alongside trade debtors on the balance sheet to offset their carrying value without clearing the customer's individual account.
For UK tax reporting, businesses should consult HMRC guidance (such as BIM42701) to confirm the deductibility of specific debtor provisions, as general blanket reserves across total debtor balances are treated differently from individually assessed debts.
Claiming bad debt VAT relief in the UK
When you issue an invoice under standard accrual accounting, you must remit value added tax to HMRC, even if the customer has not yet paid you. If that customer subsequently defaults, you risk absorbing an unrecoverable tax cost on top of the unpaid net sale.
To prevent this, HMRC VAT Notice 700/18 provides a statutory mechanism known as bad debt relief. This allows VAT-registered businesses to reclaim the output VAT previously paid to HMRC, provided specific criteria are met.
Eligibility criteria for VAT relief
To qualify for bad debt relief under HMRC rules, your claim must meet several mandatory conditions:
- Payment overdue by six months: The invoice must remain unpaid for at least six months from the later of the date payment was due or the date of supply.
- Written off in accounts: The debt must be formally written off in your accounts and transferred to a separate bad debt account.
- Within the statutory deadline: HMRC Bad Debt Relief must be claimed within four years and six months of the later of the date of supply or the due date for payment.
- Factored or assigned debts: Businesses should consult official HMRC guidance in VAT Notice 700/18 regarding the specific eligibility rules for debts that have been factored or legally assigned.
Businesses should refer to official HMRC guidance in VAT Notice 700/18 for the precise filing mechanics to reclaim this VAT.
For example, if your company issues a £10,000 invoice with £2,000 VAT on 1 February on 30-day terms (due 3 March) and remits the £2,000 to HMRC, the six-month clock begins on 3 March. If the balance remains unpaid on 3 September, you can write off the debt in your records and claim £2,000 relief through your next VAT return.
If the debtor later pays part or all of the invoice, you must repay the proportional VAT element to HMRC via Box 1 of your VAT return for that period.
Strategies for preventing bad debts
While write-offs and tax relief soften the impact of customer defaults, preventing delinquency preserves cash flow far more effectively.
- Set rigorous credit checks and limits: Before offering credit, assess the customer's credit profile and set credit limits commensurate with their financial standing.
- Enforce unambiguous payment terms: State your payment terms clearly on every quote, order confirmation, and invoice, including standard payment periods and accepted payment methods.
- Implement prompt billing and automated chasing: Issue invoices immediately upon delivering goods or completing services. Automated payment reminders sent before and shortly after the due date reduce unnecessary payment delays.
- Utilise statutory late payment rights: UK legislation gives commercial creditors statutory rights to claim late payment interest and fixed recovery compensation on overdue invoices, encouraging commercial customers to settle on schedule.