If you run a small business in the UK, you can’t afford to overlook Value Added Tax (VAT). It applies to most goods and services, and the VAT threshold determines when registration becomes compulsory.

In 2025, the VAT threshold for small businesses is £90,000 in taxable turnover. If your sales go above this amount within twelve months, you must register with HMRC.

In this guide, we explain how the VAT threshold works, how to track your turnover, and the practical steps to take if your business goes over the limit.

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What is the VAT Threshold?

As of April 2025, the VAT registration threshold for UK businesses is £90,000 in taxable turnover, calculated over a rolling twelve-month period. If your taxable sales go above this level at any point, you must register for VAT with HMRC.

Taxable turnover is the total value of sales that fall within VAT rules. It covers:

• Standard-rated sales (20%) – most goods and services
• Reduced-rate sales (5%) – certain items such as domestic fuel and power
• Zero-rated sales (0%) – essentials like most food and children’s clothes

Sales that are VAT-exempt do not count towards the threshold. These include financial services, insurance, education, and goods or services outside the scope of UK VAT.

When do small businesses need to register for VAT?

Small businesses in the UK must register for VAT when their taxable turnover goes above the threshold. HMRC applies two key rules:

• Rolling 12-month rule: If your taxable turnover has already gone above £90,000 in the past 12 months, you must register. This is based on any 12 months, not your accounting year.
• 30-day look-forward rule: Even if you haven’t yet crossed the threshold, you must register if you expect your turnover to exceed £90,000 in the next 30 days.

Some small businesses even choose to register voluntarily before reaching the £90,000 limit. This can be useful if you want to reclaim VAT on purchases, or appear more established to VAT-registered clients. For more on the advantages this can bring, check out our blog When to Register for VAT in the UK.

How to track your VAT threshold as a small business

As HMRC reviews your sales on a rolling twelve-month basis, not by calendar year or accounting year, it’s important to monitor your figures regularly. You can do this in two main ways:

• Using accounting software: Most modern accounting software, such as Xero, QuickBooks or Sage, can track your taxable turnover automatically. This makes it easier to see when you’re approaching the limit and helps you stay compliant with Making Tax Digital (MTD) rules.
• Manual tracking methods: If you’re not using software, you can still monitor your turnover manually. A simple spreadsheet updated each month works well: add up all sales that are subject to VAT (including zero-rated sales) and check if your rolling total is nearing £90,000.

Whichever method you choose, the key is consistency. If you’re unsure about your VAT position or how close you are to the threshold, our accountants at Jump Accounting can help you stay on track and avoid surprises. Contact our team today!

What to do if your small business exceeds the VAT threshold

If your business goes over the VAT threshold, registration becomes compulsory. Here’s what to do, step by step:

1. Register with HMRC:
Apply online through GOV.UK within the 30-day deadline. HMRC will send you a VAT registration certificate with your VAT number, the start date, and the due date of your first VAT return.

2. Start charging VAT:
From your effective date of registration, add VAT to eligible sales and update your invoices, website, and receipts to show your VAT number.

3. Submit VAT returns and pay HMRC:
VAT returns are usually filed every quarter. You must keep digital VAT records and file returns using Making Tax Digital (MTD)-compliant software. You’ll pay HMRC the VAT collected from customers, minus any VAT you can reclaim on your own business costs.

4. Consider the Flat Rate Scheme:
For small businesses with simple operations, the Flat Rate Scheme can make VAT reporting easier. Under this scheme, you pay a fixed percentage of turnover to HMRC instead of working out VAT on each sale and purchase.

5. Stay on top of deadlines:
Failing to register on time can result in HMRC penalties, backdated VAT charges, and interest on late payments. Acting promptly once you cross the threshold keeps your business compliant and avoids unnecessary costs.

Final Thoughts

VAT can feel like another layer of admin, but with the right systems in place, it’s easier to manage. The key is knowing when the VAT threshold applies, staying on top of deadlines, and keeping accurate records.

At Jump Accounting, our Chartered Accountants can take care of VAT registration for you while also handling bookkeeping, tax filing, and year-end reports. When you choose one of our accounting packages, we’ll even register your business for VAT at no extra cost, giving you peace of mind while you focus on growing your business. Speak to our accountants today!