A UK-established business must normally register for VAT when its taxable turnover exceeds £90,000 over a rolling 12-month period. Registration is also required if it expects taxable turnover to exceed £90,000 in the next 30 days alone.
The threshold applies to taxable sales, not profit. These are the current rules as checked in September 2026. HMRC VAT registration guidance.
For a growing business, the main task is knowing when those limits are reached. Checking your figures regularly gives you time to prepare your prices, invoices and records.
What Counts Towards the VAT Threshold?
Taxable turnover generally includes UK sales subject to the standard, reduced or zero rate of VAT. Exempt sales and sales outside the scope of UK VAT generally do not count.
Zero-rated and exempt sales are different. A sale charged at 0% can still count towards registration.
Business expenses do not reduce taxable turnover. For example, £95,000 in taxable sales with £40,000 in expenses still means taxable turnover of £95,000.
Overseas transactions and business transfers can require separate checks. Businesses established outside the UK may face registration requirements without the usual threshold. HMRC VAT Notice 700/1.
How the Rolling 12-Month Period Works
At each month end, check taxable sales for the previous 12 months. The calculation does not restart with your financial year or the April tax year.
For example, at the end of September, review sales from the previous October through September. At the end of October, remove the older October figure and add the new one.
If your business has traded for less than 12 months, check sales since it started. You can reach the threshold before completing your first year. HMRC guidance on calculating registration liability.
A monthly sales report makes this easier to monitor. Keep it alongside your bookkeeping records and review it before accepting a large contract.
When You Need to Register
There are two main registration tests, with different starting dates.
| Registration trigger | Application deadline | VAT registration starts |
| Taxable turnover exceeds £90,000 over the previous 12 months | Within 30 days after the end of the month when you exceeded the threshold | The first day of the second month after exceeding it |
| You expect taxable turnover to exceed £90,000 in the next 30 days alone | By the end of that 30-day period | The date you realised the threshold would be exceeded |
The forward test concerns sales in those 30 days alone. It is not a general forecast for the coming year. HMRC registration deadlines.
Should You Register Voluntarily?
Eligible businesses below the threshold can choose to register voluntarily. HMRC guidance on voluntary registration.
The decision depends on your customers, purchases and pricing.
Registration may let you recover VAT on eligible business costs. However, recovery rules and exclusions apply. For purchases used both personally and for business, you can generally reclaim only the business share. HMRC guidance on reclaiming VAT.
Consider who buys from you. Customers who can recover VAT may be less sensitive to VAT being added to an invoice. Private customers usually focus on the total amount they must pay.
Before deciding, compare:
- VAT you could recover on eligible purchases.
- The effect on your final selling prices.
- Any reduction in your margin if prices stay unchanged.
- The cost of maintaining records and preparing returns.
A simple forecast using your own figures is more useful than assuming voluntary registration will save money.
How VAT Registration Can Affect Your Prices
Once registered, you need to apply the correct VAT treatment to your sales. Different goods and services can have different rates. HMRC guidance on charging VAT.
For illustration, assume a service is subject to 20% VAT.
A £100 price before VAT becomes £120 for the customer. If you keep the final price at £100, that amount contains £16.67 of VAT. Your sales income before VAT would be £83.33.
This example shows why pricing needs attention before registration begins. Review existing quotes and contracts, particularly where a fixed total price has already been agreed.
Explain any price changes clearly to customers. Your invoices and terms should make the amount payable easy to understand.
How to Register for VAT
Most businesses can apply online through HMRC.
Prepare your turnover figures, business bank details and relevant tax references. Limited companies will also need their company registration number. The exact information depends on the business structure.
After registration, HMRC confirms your VAT number, effective registration date and first return details.
If you are waiting for your number, you must still account for VAT from the effective date. You cannot show VAT separately on invoices until the number arrives. HMRC explains how to adjust prices and reissue invoices during this period. How to register for VAT.
What Changes After Registration?
VAT registration brings ongoing record-keeping and reporting duties.
Unless exempt, businesses must keep the required digital VAT records and submit returns using compatible software under Making Tax Digital for VAT. HMRC normally enrols newly registered businesses automatically. Making Tax Digital for VAT.
Before your first return, make sure your records clearly show sales, purchases and their VAT treatment. Agree who will check the figures and submit the return.
It also helps to set money aside for VAT payments. Treating every customer receipt as available spending money can leave a gap when payment is due.
What Happens if You Register Late?
Late registration can leave you owing VAT from the date registration should have started. A penalty may also apply. HMRC late registration guidance.
If your records suggest you have already crossed the threshold, review the dates promptly. Gather your monthly sales totals and seek help establishing the correct registration date.
Get Help With VAT Registration
RMA Accountants LTD helps businesses in Tameside review their VAT position and prepare for registration.
Our VAT services cover registration, records and returns. We can help you understand which figures to check and what information is needed.
If your turnover is approaching the threshold, contact RMA Accountants on 0161 222 8040 or email info@rma-accountants.com.
