VAT registration becomes compulsory the moment your taxable turnover crosses £90,000 in any rolling 12-month period. Miss that point and HMRC can demand back-payment of all the VAT you should have charged — plus interest and penalties. Understanding how the threshold works, knowing your options, and choosing the right VAT scheme for your business can save you significant money and administrative headaches.
How the £90,000 Threshold Works
The VAT registration threshold is £90,000 as of 2024, up from the previous £85,000. It applies to your taxable turnover — that is, the total value of VAT-taxable sales you make in the UK, regardless of whether those sales are standard-rated (20%), reduced-rated (5%), or zero-rated (0%). Exempt sales — such as insurance, postage stamps, and health services — don't count towards the threshold.
The Rolling 12-Month Test
This is where people often get caught out. The threshold isn't calculated on your tax year or financial year. HMRC tests it on a rolling 12-month basis — meaning you need to check at the end of every calendar month whether your taxable turnover for the preceding 12 months has exceeded £90,000.
For example, if your turnover for the 12 months ending 31 March 2025 is £88,000 but you then have a strong April and take the 12 months to 30 April 2025 above £90,000, you must register from 1 June 2025 (30 days after the end of the month in which you exceeded the threshold).
The Future Test
You must also register if you have reasonable grounds to believe that your taxable turnover will exceed £90,000 in the next 30 days alone. This prevents businesses from deferring registration when they know a large contract is imminent.
What Happens When You Register
Once registered, you must:
- Charge VAT (at the appropriate rate) on all taxable sales
- Issue VAT invoices to VAT-registered customers
- Submit VAT returns (usually quarterly)
- Pay any VAT owed to HMRC by the deadline
- Keep VAT records for at least 6 years
In return, you can reclaim VAT on business purchases — which is one of the significant benefits of registration.
The Main VAT Schemes
HMRC offers several VAT accounting schemes. Choosing the right one can reduce your admin burden and, in some cases, improve your cash flow.
Standard VAT Accounting
You account for VAT based on the date of the invoice, regardless of when you're paid. If you invoice a customer in March but they pay in May, the VAT is due in your March return. This is the default method and suits businesses with steady cash flow and prompt-paying customers.
Cash Accounting Scheme
You account for VAT based on the date of payment, not the invoice date. This means you only pay VAT to HMRC once your customers have actually paid you — a significant cash flow advantage if you have clients who take 30–60 days to pay. You can also only reclaim VAT on purchases you've actually paid for. Available if your taxable turnover doesn't exceed £1.35 million.
Flat Rate Scheme
Instead of calculating VAT on each individual sale and purchase, you pay a fixed percentage of your gross (VAT-inclusive) turnover to HMRC. The flat rate varies by business sector — for example, accountants pay 14.5%, management consultants 14%, IT consultants 14.5%, and retailers 7.5%. You keep the difference between the VAT you charge customers (20%) and the flat rate you pay.
Available if your taxable turnover doesn't exceed £150,000. Most beneficial for businesses with low VAT-taxable costs (services businesses rather than product resellers). Note: a "limited cost trader" rate of 16.5% applies if your VAT-inclusive costs on goods are less than 2% of your turnover — this largely eliminated the scheme's benefit for service-only businesses.
Annual Accounting Scheme
Instead of quarterly returns, you submit one VAT return per year. You make advance payments during the year (nine monthly or three quarterly instalments) based on an estimate of your annual liability, then settle the balance with your annual return. This reduces paperwork but limits cash flow flexibility. Available if your taxable turnover doesn't exceed £1.35 million.
VAT Rates in the UK
| Rate | What It Applies To | Examples |
|---|---|---|
| Standard (20%) | Most goods and services | Professional services, electronics, clothing |
| Reduced (5%) | Specific categories | Home energy, children's car seats, mobility aids |
| Zero (0%) | VAT-taxable but no VAT charged | Food, children's clothes, books, most transport |
| Exempt | Outside the VAT system | Insurance, postage, health, education, finance |
Voluntary VAT Registration
You can register for VAT voluntarily even if your turnover is below £90,000. This is often worth considering if:
- Your customers are predominantly VAT-registered businesses (who can reclaim the VAT you charge them, so it has no cost impact)
- You make significant VAT-taxable purchases (you can reclaim that input VAT)
- You sell zero-rated goods or services (you charge 0% VAT but can still reclaim input VAT on your costs — a net benefit)
- You want to appear more established to larger clients
Voluntary registration makes less sense if your customers are mainly private individuals (who can't reclaim VAT and will see your prices increase by 20% unless you absorb it) and your business has low VAT-taxable costs.
How to Register for VAT
Registration is done online through your Government Gateway account at gov.uk. You'll need your business details, UTR number, and information about your turnover. HMRC aims to process registrations within 30 days, though it can take longer during busy periods. You'll receive a VAT registration number (nine digits, starting with "GB") which must appear on all VAT invoices.
You can also request a specific VAT start date — important if you've been making taxable sales before registering, as you may owe back-VAT from the date you crossed the threshold.
VAT Return Deadlines
Quarterly VAT returns are due one month and seven days after the end of the VAT period. So if your VAT quarter ends on 31 March, your return and payment are due by 7 May. Penalties for late filing or payment have changed under the new points-based system introduced in January 2023.
MTD for VAT
All VAT-registered businesses must comply with Making Tax Digital (MTD) for VAT — meaning you must keep digital records and submit VAT returns using MTD-compatible software. You cannot submit VAT returns manually through HMRC's portal any more. Acceptable software includes Xero, QuickBooks, Sage, FreeAgent, and others.
Getting VAT Right from the Start
VAT mistakes are among the most common — and costly — errors made by small businesses. Charging the wrong rate, failing to register on time, or misclaiming input VAT can all result in HMRC assessments for back-payment plus interest and penalties.
At SMD Accountancy, we handle VAT registration, help clients choose the right scheme, prepare and submit quarterly returns, and advise on VAT-efficient business structures. If you're approaching the registration threshold or unsure whether you should register voluntarily, get in touch for a free initial conversation.