VAT is one of those things that quietly ambushes small businesses. One month you’re happily below the threshold, the next you’ve had a strong quarter and suddenly you’re in scope, sometimes without realising.
This guide covers when you have to register, when you should register voluntarily, and the practical implications of each.
The current VAT threshold
As of the 2026/27 tax year, you must register for VAT if your taxable turnover exceeds £90,000 in any rolling 12-month period. This isn’t a calendar year figure. It’s rolling, meaning HMRC looks at any 12 consecutive months.
You also have to register if you expect to exceed £90,000 in the next 30 days alone (for example, if you win a big contract).
Important: the VAT threshold has changed several times in recent years. Always verify the current level on GOV.UK before acting on it.
What counts as taxable turnover
This is where people get caught out. Taxable turnover is broadly your total sales of goods and services in the UK, excluding VAT-exempt sales. It includes:
- All standard-rated sales
- All reduced-rated sales (5% VAT items)
- All zero-rated sales (yes, zero-rated still counts toward the threshold)
It does not include:
- VAT-exempt sales (like most financial services, education, healthcare)
- Sales outside the scope of UK VAT (like most sales to non-UK customers)
- The sale of capital assets used in the business
When you must register
If you cross the threshold, you have 30 days to register from the end of the month you crossed it. Miss the deadline and there are penalties, plus you’ll still owe the VAT you should have been charging.
The most common trap: businesses monitor their tax-year turnover, not their rolling 12-month turnover. So they think they’re safely under the threshold when they’ve actually already crossed it. Check the rolling 12 months at the end of each month, not just once a year.
When voluntary registration makes sense
You don’t have to wait until you hit the threshold. You can register voluntarily at any turnover level. This is worth considering when:
You sell mostly to VAT-registered businesses
If your customers are other businesses that can reclaim VAT, they don’t care whether you charge it. But you can reclaim the VAT on your costs. This is often a net gain.
Your input VAT is significant
If you’re spending a lot on VAT-inclusive purchases (equipment, materials, professional services), being able to reclaim that VAT can be worth thousands. Register voluntarily and get it back.
You want to look like a bigger business
Being VAT-registered signals a certain scale. For some industries (particularly professional services and B2B), this matters for credibility. Not the strongest reason on its own, but it’s a real factor.
You’re near the threshold anyway
If you’re at £85,000 and growing, registering now avoids the scramble when you hit £90,000. Easier to plan the switch than react to it.
When voluntary registration is a bad idea
- Your customers are mostly consumers or non-VAT businesses. In this case, adding 20% VAT to your prices either makes you more expensive or eats into your margin. Neither is great.
- Your input VAT is minimal. If most of your costs are things like wages (no VAT), rent (often no VAT), or interest (no VAT), you don’t have much VAT to reclaim. Registration adds admin without much benefit.
- Your admin capacity is stretched. VAT means quarterly returns, careful record-keeping, and a real habit of ring-fencing VAT money. If your bookkeeping is already struggling, adding VAT can make it worse.
The three VAT schemes worth knowing
Standard VAT accounting
The default. You charge VAT on sales, reclaim VAT on purchases, and pay HMRC the difference quarterly. Straightforward but requires proper bookkeeping.
Flat Rate Scheme
For businesses under £150,000 turnover. Instead of tracking VAT on every purchase, you pay HMRC a fixed percentage of your total turnover (varies by industry). Simpler, and often financially advantageous for businesses with low input VAT (like consultants and freelancers).
Cash Accounting Scheme
Under £1.35m turnover. You only account for VAT when the money actually moves (rather than when you invoice or are invoiced). Excellent for cashflow if you have long payment terms from customers.
Each has different pros and cons. The right choice depends on your business model, cashflow, and admin capacity. Talk to your accountant before choosing.
What VAT registration means in practice
Once registered, you need to:
- Charge VAT on all your standard-rated sales
- File a VAT return every quarter (or monthly if you prefer)
- Pay HMRC any VAT owed (or reclaim if you’re owed)
- Keep proper digital records under Making Tax Digital rules
- Issue VAT-compliant invoices to your customers
None of this is difficult. All of it requires discipline.
The most useful VAT habit
Treat VAT as never yours.
The moment a payment arrives in your account, mentally split it into “your money” and “HMRC’s money that’s temporarily in your bank.” Better yet, actually move the VAT into a separate account so it’s out of sight.
The single most common cashflow crisis we see in VAT-registered businesses is owners who’ve spent the VAT thinking it was their working capital, only to find the quarter-end bill arrive when there’s nothing to pay it with.
Not sure whether you should register for VAT? Drop us a message and we’ll walk through your specific situation. No pressure, just a proper answer.
