How to Avoid Common VAT Errors in 2026

In business, few things carry as much “admin-anxiety” as a VAT return. You’ve done the work, you’ve collected the receipts, and you’ve navigated your software, but there’s always that nagging feeling: Did I miss something?

In 2026, the stakes are higher than they used to be. With HMRC’s points-based penalty system now fully embedded and Making Tax Digital (MTD) tighter than ever, VAT errors can lead to automatic fines and increased scrutiny.

Most of these mistakes aren’t intentional, but are the result of a complex tax system meeting a busy business owner’s schedule. Nevertheless, most VAT errors are entirely avoidable. So here’s a breakdown of the most common pitfalls we’re seeing in 2026 and how to avoid making them:

Error 1: Miscalculating Taxable Turnover 

This one matters most for businesses approaching the £90,000 VAT registration threshold, but it also affects registered businesses who need to monitor their position for de-registration or scheme eligibility.

The most frequent mistake is treating all revenue as taxable turnover when it isn’t. Exempt income (from financial services, certain types of education, or some healthcare services), for example, does not count towards the threshold. Zero-rated income does. And that distinction alone can make a significant difference to where a business sits relative to the threshold.

The Fix: Review your income streams and categorise each one correctly: standard-rated, zero-rated, reduced-rated or exempt. If your business makes both taxable and exempt supplies, you may be ‘partly exempt’, which also affects how much input VAT you can reclaim. 

Error 2: Applying the Wrong VAT Rate

With three positive VAT rates (20%, 5%, and 0%) plus exempt and out-of-scope categories, it’s easy to see why rate errors are so common. The lines between zero-rated and exempt are particularly blurry. Hence, the consequences of getting it wrong run in both directions. Charge too much VAT, and you’ve overcollected from customers. Charge too little, and you’re liable for the shortfall.

Common areas of confusion include food (some items are standard-rated, others zero-rated), construction (different rules apply to new builds, renovations, and commercial projects), and digital services supplied to overseas customers.

The Fix: When you add a new product or service, check the correct VAT liability before you start invoicing. Don’t assume it follows the same rate as your existing lines. HMRC’s VAT rates guidance is a good starting point, but if you’re in any doubt, ask.

Error 3: Poor Record Keeping and MTD Non-Compliance

Since Making Tax Digital (MTD) became mandatory for VAT-registered businesses, HMRC expects a complete digital journey from your records to your return. That means no manual re-keying, no copy-and-paste steps between systems, and no spreadsheets that aren’t connected via approved bridging software.

In 2026, non-compliance here is no longer a grey area. 

HMRC has the tools to identify businesses whose submissions don’t follow a compliant digital path. Additionally, they can also check for inaccurate returns. Even one with correct figures can attract an inaccuracy penalty if the process that produced it wasn’t sound!

The Fix: Make sure you’re using HMRC-approved software (Xero, QuickBooks, Sage, or similar), that your records are updated regularly rather than in a quarterly rush, and that there are no manual steps breaking the digital link between your data and your submission.

Error 4: Missing Filing Deadlines

The penalty points system introduced in January 2023 is still catching businesses out. Each late VAT return earns a penalty point, and quarterly filers reach the £200 fine threshold at just four points. Once you’re in penalty territory, fines apply to every subsequent late return until you’ve completed a 12-month period of on-time compliance.

What many businesses don’t realise is that the submission and payment deadlines are the same date, but treated separately. Filing your return on time but paying late still triggers a late payment penalty. This accrues interest from day 1, and fixed penalties kick in from day 16.

The Fix: Put your VAT deadlines in your calendar — 1 month and 7 days after each quarter end. Build in a buffer. And if you ever can’t pay on time, contact HMRC before the deadline to discuss a Time to Pay arrangement rather than missing it without explanation.

Error 5: Incorrect Treatment of Expenses and Reclaims

Over-claiming input VAT is one of the most common triggers for an HMRC compliance check. 

The rules are specific: you can only reclaim VAT on purchases that are exclusively for business use. Mixed-use items require apportionment. And certain categories are blocked entirely, regardless of how they’re used.

Blocked items include client entertainment, most car purchases (unless the vehicle is used 100% for business), and anything acquired for personal use. A common mistake is reclaiming VAT on a company car or a team lunch and assuming it’s fine because it feels business-related. It isn’t.

The Fix: Audit your regular expense reclaims and confirm each one is allowable. For mixed-use items, document your apportionment method and apply it consistently. And make sure anyone entering expenses into your system understands the rules (not just the person who files the return!).

A Note on HMRC Compliance Checks

HMRC doesn’t randomly select businesses for VAT inspections. Certain patterns attract attention, and knowing them could help you avoid an HMRC investigation, such as:

• Input tax that seems high relative to output tax.
• Turnover hovering near the registration threshold.
• A history of late submissions.
• Returns that look inconsistent quarter to quarter.

Being selected doesn’t necessarily mean you’ve done something wrong. But it does mean you need to produce your records quickly, clearly and in full. Businesses with clean digital records and a consistent filing history find the process manageable. Those without them tend to find it considerably more stressful and more expensive.

Get Your VAT Right Without The Stress

VAT compliance in 2026 doesn’t have to be a source of stress. The most successful SMEs aren’t the ones who spend their weekends staring at spreadsheets. Instead, they’re the ones who put robust systems in place and delegate the technical heavy lifting to experts.

At Ellis & Co, we provide more than just a filing service. We act as your proactive partner, auditing your processes to catch these five VAT errors before they ever reach HMRC’s radar. Whether you need a one-off VAT health check or a fully managed digital accounting solution, we are here to ensure you stay compliant, protected, and focused on your growth.

So are you ready to bulletproof your VAT process? 

Contact us today for a warm, no-obligation conversation with our expert team in Chester, Wrexham or Warrington. 

Let us give you the confidence that your compliance is in safe hands.

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About Ellis & Co 

Ellis & Co is a leading accountancy firm specialising in accountancy & audit, bookkeeping, payroll, tax planning and business advisory services. We work with a diverse range of businesses, from start-ups to established companies, ensuring they have the financial clarity and support they need to succeed. With our team of experienced accountants based in Chester, Warrington and Wrexham, we are proud to offer personalised solutions that help businesses succeed.