5 common VAT pitfalls that still trigger surprise bills and penalties

VAT problems rarely come from one single mistake. They are more likely to come from small process gaps that repeat every quarter. Fix the process and the risk drops quickly.

For many owner-managed businesses, VAT sits in the background until the quarter ends. The bookkeeper prepares the return, the figures are checked, the payment is made, and attention moves on. That routine can work when the process is controlled. It becomes risky when the VAT return is treated as a filing task rather than a review point.

The five areas below are not designed to cover every VAT rule. They are the areas where a practical quarterly check can reduce the chance of a surprise bill.

Reclaiming VAT without proper evidenceInput VAT claims need proper evidence. HMRC guidance is clear that a business cannot reclaim VAT using an invalid invoice, a pro-forma invoice, a statement, or a delivery note. VAT invoices received from suppliers are the primary evidence for recovering VAT.

Why this matters 
This is not just a paperwork issue. If unsupported claims are picked up later, the business may have to repay VAT it had already treated as available cash. Repeated weak evidence also increases review time and HMRC risk.

Actions to take:

• Spot check the largest input VAT claims before the return is filed.
• Check that supplier invoices are in the correct name and include the required VAT details.
• Do not reclaim VAT from statements, delivery notes, quotes, or pro-formas unless proper VAT evidence is obtained.
• Resolve supplier invoice issues during the quarter, not months later when the trail is harder to follow.

Treating vehicles, fuel, and entertaining as standard expensesVehicles, fuel, and entertaining are common areas for incorrect VAT claims because the business purpose can be mixed with private or non-recoverable use.

Car VAT recovery is particularly strict. Fuel also needs care: where business fuel is made available for private use, the business may need to account for VAT using the road fuel scale charge or another acceptable method. HMRC has published updated road fuel scale charges for 1 May 2026 to 30 April 2027.

Business entertainment is another area where assumptions cause problems. VAT on business entertainment is generally blocked, while staff entertainment can be different depending on who attends and why the cost is incurred.

Why this matters
These costs can be familiar and recurring, which makes them easy to approve without challenge. The risk is that small incorrect claims repeat every quarter and only become visible when there is a review or HMRC query.

Actions to take:

• Review all vehicle and fuel claims for business and private-use treatment.
• Check whether fuel scale charges apply, and use the correct scale charge for the relevant VAT period.
• Check entertaining claims separately from staff welfare, subsistence, and ordinary business expenses.
• Make sure the coding rules in the accounting system reflect the VAT restrictions, not just the nominal category.

Missing the VAT registration trigger as turnover movesThe current VAT registration threshold for taxable supplies is £90,000, with the deregistration limit at £88,000. The important point for directors is that the registration test is based on taxable turnover, not simply profit or cash in the bank.

Why this matters
A growing business can cross the threshold before the owner feels larger or more profitable. A few strong months, a large project, or a new sales channel can move the business into VAT registration territory. Registering late can mean backdated VAT and penalty exposure.

Actions to take:

• Review rolling taxable turnover monthly if the business is approaching the threshold.
• Flag large one-off invoices, new contracts, or growth in a product line that may move the business over the limit.
• Consider pricing, margin, and customer communication before the registration date arrives.
• If turnover is close to the threshold, do not wait until the year-end accounts to review it.

Ignoring overdue suppliers, bad debts, and VAT cash timingVAT can create pressure on both sides of the ledger. If a supplier invoice remains unpaid for more than six months after the agreed payment date or other relevant date, input VAT previously reclaimed may need to be repaid. On the sales side, bad debt relief may be available where the conditions are met, but it needs to be tracked and claimed correctly.

Why this matters
This is where VAT links directly to working capital. Under standard VAT accounting, a business can account for VAT on sales it has not yet collected, while also needing to repay input VAT on purchases it has not paid. If nobody is reviewing aged debt and creditor balances through a VAT lens, the cashflow effect can be missed.

Actions to take:

• Review supplier invoices more than six months beyond the agreed payment date or other relevant date for input VAT clawback risk.
• Review customer debts more than six months past the relevant due date for possible bad debt relief, subject to the conditions being met.
• Make sure VAT treatment is part of credit control and supplier payment review, not only year-end clean-up.
• Document any disputes, extended credit terms, or repayment decisions clearly.

Leaving imports, payment deadlines, and final checks too lateFor businesses importing goods, postponed VAT accounting can help cashflow because import VAT can be accounted for on the VAT return rather than paid upfront, subject to the normal rules. But it still needs accurate records, including monthly postponed import VAT statements.

Payment timing also matters. For VAT accounting periods starting on or after 1 January 2023, late payment penalties apply if VAT is paid late. Late payment interest is charged from the first day the payment is overdue until it is paid in full. HMRC guidance says the first late payment penalty starts when a payment is 16 or more days overdue, with further consequences if the payment reaches 31 or more days overdue.

Why this matters
The business may technically have a VAT process, but if import statements are not reconciled and payment affordability is only checked at the deadline, the owner has less room to act. A VAT liability should not come as a surprise the week it is due.

Actions to take:

• Download and keep postponed import VAT statements where relevant.
• Check import VAT entries against the VAT return and customs records.
• Reconcile the VAT control account to the return and the expected payment.
• Confirm the business can pay the VAT before the deadline, not on the day it is due.
• If payment may be difficult, contact HMRC early about Time to Pay rather than waiting for penalties to build.

How can we help?

If VAT feels unpredictable, the issue may be the process rather than the return itself. We can help you review how VAT is being recorded, checked, and paid, then build a practical quarterly control routine around your business. That can reduce the risk of unsupported claims, late payment charges, HMRC queries, and avoidable cashflow pressure.

We take pressure off owners and support wider finance teams, so they can get clearer numbers they can rely on and can run the business rather than the business running them.

If you would like to see how we can help, Please contact us via the form below and we will be happy to advise on the best solutions for your business. We are here to support you in navigating these complexities.

Frequently Asked Questions

Q: Why should a business owner care about VAT if the accountant files the return?
A: Because VAT affects cashflow, pricing, supplier payments, credit control, and HMRC risk. The return may be filed by the accountant, but the process behind it sits inside the business.

Q: Can I reclaim VAT without a VAT invoice?
A: Usually you need proper VAT evidence. HMRC says you cannot reclaim VAT using an invalid invoice, pro-forma invoice, statement, or delivery note. If an invoice is wrong, ask the supplier to correct it.

Q: Do I need to register for VAT if I only have a few large jobs?
A: It depends on taxable turnover, not the number of jobs. The current registration threshold is £90,000, so large projects can move a business over the limit quickly.

Q: Can VAT on business fuel be reclaimed?
A: It depends how the fuel is used and recorded. If business fuel is also available for private use, scale charges or another correct method may be needed.

Q: What happens if a supplier invoice remains unpaid?
A: Input VAT previously reclaimed may need to be repaid if the invoice remains unpaid more than six months after the agreed payment date or other relevant date. This should be reviewed as part of the VAT process.

Q: Can I claim VAT bad debt relief when a customer has not paid?
A: It may be possible if the debt meets the conditions, including the relevant six-month rule and proper VAT accounting treatment. It should be tracked properly and not left until year end by default.

Q: How do VAT late payment penalties work now?
A: For VAT periods starting on or after 1 January 2023, late payment penalties apply to late VAT payments. Interest can also run from the first day payment is overdue. If payment is going to be difficult, contact HMRC early about Time to Pay.

Q: Is VAT on client entertaining reclaimable?
A: Generally, VAT on business entertainment is blocked. Staff entertainment can be different, but mixed events and director-only costs need care.

Please note: This article is based on information available at the time of publication, including official government, central bank and international agency sources. Conflict developments, sanctions, shipping conditions, reserve release decisions, energy prices and wider market responses can change quickly. As a result, some details discussed may be subject to revision. Readers are strongly advised to consult current official sources and seek appropriate professional advice before taking any action. No responsibility can be accepted for any loss incurred by any person acting or refraining from action as a result of the material contained in this article.