VAT registration is an important decision for any growing UK business. It affects your pricing, invoices, bookkeeping, cash flow and reporting responsibilities.
The key point is simple: VAT registration is based on taxable turnover, not profit. A business can have low profits but still need to register if its sales exceed the VAT threshold.
This guide explains when registration is compulsory, when voluntary registration may help, what happens after registering and how to manage VAT returns for a small business.
What is the VAT registration threshold in 2026?
You must register for VAT if either:
- Your total taxable turnover for the previous 12 months is more than £90,000.
- You expect your taxable turnover to exceed £90,000 in the next 30 days alone.
The £90,000 test is based on a rolling 12-month period. It does not apply only to your accounting year, tax year or calendar year.
For example, if your taxable sales from October 2025 to September 2026 exceed £90,000, you may need to register even if your accounting year ends on 31 March.
You should review your rolling turnover at the end of every month. HMRC’s current guidance is available on the VAT thresholds page on GOV.UK.
Taxable turnover is not the same as profit
This is one of the most common VAT misunderstandings.
Turnover is the total value of the goods and services your business sells. Profit is what remains after deducting allowable business costs.
VAT registration is based on turnover. It does not matter whether your business makes:
- £20,000 profit;
- £5,000 profit; or
- no profit at all.
If your taxable turnover is above the threshold, registration may be compulsory.
Taxable turnover generally includes:
- Standard-rated sales;
- Reduced-rated sales;
- Zero-rated sales;
- Goods hired or loaned to customers;
- Some business assets used privately;
- Certain reverse charge transactions.
Zero-rated sales still count towards the registration threshold, even though the VAT rate charged to the customer is 0%. Exempt and out-of-scope supplies are generally treated differently.
If you are uncertain which sales count, review HMRC’s guidance on when to register for VAT.
When is VAT registration compulsory?
There are two main compulsory registration tests.
1. Your previous 12 months’ turnover exceeds £90,000
If your taxable turnover goes above £90,000 during a rolling 12-month period, you must normally register within 30 days of the end of the month in which you exceeded the threshold.
Your effective registration date will usually be the first day of the second month after you exceeded the threshold.
For example, if your rolling turnover first exceeds the threshold on 15 July, you generally need to register by 30 August, with registration taking effect from 1 September.
2. You expect to exceed £90,000 in the next 30 days
This is a separate and faster test.
If you sign a large contract and expect the value of your taxable turnover to exceed £90,000 in the next 30 days alone, you must register by the end of that 30-day period.
Your effective registration date is the date you realised that the threshold would be exceeded. It is not necessarily the date when the money reaches your bank account.
Late registration can mean paying VAT on sales made from the date you should have registered, even if you did not charge VAT to your customers.
Can you register voluntarily?
Yes. You can choose to register for VAT when your taxable turnover is below £90,000.
Voluntary registration may be suitable when:
- Most of your customers are VAT-registered businesses;
- Your business has substantial VAT-bearing costs;
- You are investing in equipment, stock or premises;
- You want to work with larger businesses that expect suppliers to be VAT-registered;
- You want to recover eligible VAT on certain business purchases.
If your customers are VAT-registered, they can usually reclaim the VAT you charge, subject to their own circumstances.
However, voluntary registration may be less attractive if you mainly sell to members of the public. You may need to increase your prices by VAT or absorb the VAT within your existing prices, which can reduce your profit margin.
Before registering voluntarily, compare your customer base, pricing structure, costs and likely administrative burden.
What happens after registering for VAT?
Once HMRC registers your business, you will receive a VAT registration number and an effective date.
You will then generally need to:
- Charge VAT at the correct rate on taxable sales.
- Issue VAT invoices containing the required information.
- Keep appropriate VAT records.
- Submit VAT returns by the relevant deadlines.
- Pay any VAT due to HMRC.
- Use Making Tax Digital-compatible software.
Most small businesses submit VAT returns quarterly. A VAT return normally reports the VAT charged on sales, known as output VAT, and the VAT paid on eligible business purchases, known as input VAT.
The basic calculation is:
Output VAT – Input VAT = VAT payable to HMRC
If your input VAT is greater than your output VAT, you may be able to claim a repayment, subject to the relevant rules.
You can read more about managing VAT returns for small business and the related record-keeping requirements.
Which VAT rates apply?
There are three main VAT rates:
- Standard rate: currently 20% for most goods and services;
- Reduced rate: currently 5% for specific goods and services;
- Zero rate: 0% for certain goods and services.
A zero-rated sale is still a taxable sale. You include it when testing the registration threshold and report it on your VAT return.
An exempt sale is different. VAT is not charged, and the sale is generally excluded from the taxable turnover calculation. The distinction between zero-rated and exempt supplies is important because it can also affect your ability to reclaim input VAT.
Always check the correct treatment before applying VAT to an invoice. HMRC publishes the latest information on VAT rates and exemptions.
Can you reclaim VAT on business expenses?
VAT-registered businesses can generally reclaim VAT on eligible purchases used for business purposes.
Examples may include:
- Stock and materials;
- Business equipment;
- Professional fees;
- Certain software subscriptions;
- Business premises costs;
- Some travel and operating costs.
You must have appropriate evidence, normally a valid VAT invoice. A bank statement alone will not usually be enough to support a VAT reclaim.
Some costs are restricted or excluded. For example, VAT on business entertainment for customers is generally not recoverable, while different rules may apply to employee entertainment and certain vehicles.
You should also take care with purchases from overseas suppliers. Some services may fall under the reverse charge, which needs to be reported correctly even where the overall VAT effect appears neutral.
VAT schemes for small businesses
VAT schemes can change how you calculate and report VAT. They do not remove the requirement to register when compulsory registration applies.
Flat Rate Scheme
The Flat Rate Scheme may be available where taxable turnover is £150,000 or less, excluding VAT. You pay HMRC a fixed percentage based on your business sector rather than calculating input VAT on every purchase in the usual way.
It can simplify administration, but it is not automatically cheaper. Businesses with significant VAT-bearing costs may be better suited to standard VAT accounting.
Cash Accounting Scheme
The Cash Accounting Scheme may be available where taxable turnover is £1.35 million or less.
Under this method, you generally account for VAT when your customers pay you rather than when you issue invoices. This can support cash flow where customers regularly pay after 30 or 60 days.
Annual Accounting Scheme
The Annual Accounting Scheme may also be available where taxable turnover is £1.35 million or less. You make advance payments towards your VAT bill and usually submit one VAT return each year.
This may reduce administration, although it requires accurate forecasting and budgeting.
The best scheme depends on your payment terms, customers, costs, profit margins and transaction volume.
Making Tax Digital for VAT
Most VAT-registered businesses must comply with Making Tax Digital for VAT.
This generally means:
- Keeping VAT records digitally;
- Using compatible software;
- Maintaining digital links between records and submissions;
- Filing VAT returns through the approved software.
You should not rely on manual spreadsheets or retyping figures into an online form unless your process meets HMRC’s digital link requirements.
Good bookkeeping makes MTD compliance easier. Sales invoices, purchase invoices, credit notes and payment records should be entered accurately and regularly rather than reconstructed shortly before the VAT deadline.
HMRC’s VAT record-keeping guidance provides further information.
When can you deregister?
If you are already VAT-registered and your taxable turnover falls below £88,000, you may be able to cancel your VAT registration voluntarily.
You may also need to deregister if your business stops making taxable supplies.
Deregistration is not automatic. You must apply to HMRC and consider the VAT implications of assets still held by the business. You should also continue submitting returns until HMRC confirms the effective deregistration date.
Deregistering may reduce administration, but it is not always the right decision. If turnover is close to the threshold or expected to increase again, professional advice can help you assess the position.
Common VAT mistakes to avoid
The most frequent errors include:
- Checking turnover only at year end instead of monthly;
- Confusing turnover with profit;
- Ignoring the 30-day forward-looking test;
- Treating zero-rated sales as exempt;
- Charging VAT before the effective registration date;
- Failing to show VAT separately on invoices;
- Reclaiming VAT without a valid invoice;
- Spending VAT collected from customers;
- Missing VAT return or payment deadlines;
- Applying the wrong VAT scheme;
- Forgetting reverse charge transactions;
- Mixing personal and business expenditure.
When should you seek professional advice?
VAT becomes more complex when your business has mixed-rate sales, overseas customers, subcontractors, property transactions, large equipment purchases or several connected businesses.
You should consider professional advice if:
- Your turnover is approaching £90,000;
- You have exceeded the threshold and are unsure when registration should begin;
- You are considering voluntary registration;
- You need help choosing a VAT scheme;
- You are unsure whether an expense is reclaimable;
- You have received an HMRC VAT letter;
- You may have registered late;
- You are considering deregistration.
KKB Accounting Ltd supports owner-managed businesses with VAT registration, bookkeeping, VAT returns for small business, Making Tax Digital compliance and ongoing tax advice.
Speak to KKB Accounting Ltd
VAT registration should be planned rather than treated as an administrative surprise. By monitoring taxable turnover each month and understanding how registration will affect your prices, records and cash flow, you can make a more informed decision.
Hi! If you are approaching the VAT threshold or need help reviewing your current VAT process, chat with KKB Accounting Ltd today:
Email: info@kkbaccounting.co.uk
Phone: 0116 373 0228
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Contact: Speak to KKB Accounting Ltd
