VAT Registration Timing

Key facts

You must register for VAT when taxable turnover exceeds £90,000 in any rolling 12-month period.
You can voluntarily register at any turnover level.
Voluntary registration lets you reclaim input VAT on purchases and expenses.
You can backdate a voluntary registration by up to 4 years to reclaim past input VAT.
VAT-registered businesses must file quarterly returns via Making Tax Digital.

Why VAT Registration Timing Matters

VAT registration is one of the most significant administrative and financial milestones for a growing business. Getting the timing right can save you money, improve cash flow, and avoid penalties.^[1]

Compulsory Registration

You must register for VAT if:^[2]

Your taxable turnover exceeds £90,000 in any rolling 12-month period (the “historic test”)
You expect your taxable turnover to exceed £90,000 in the next 30 days alone (the “future test”)

You must notify HMRC within 30 days of the end of the month in which you exceeded the threshold. Registration takes effect from the first day of the second month after you exceeded it.

Example: Your rolling 12-month turnover hits £91,000 on 15 March 2026. You must notify HMRC by 30 April 2026. Your VAT registration takes effect from 1 May 2026.

Voluntary Registration

You can register voluntarily even if your turnover is well below £90,000. Reasons to consider this:

Arguments For

Reclaim input VAT: Recover 20% VAT on purchases, equipment, and expenses
B2B customers: If your customers are VAT-registered, they reclaim the VAT you charge — your prices are effectively neutral
Credibility: Being VAT-registered can make a small business appear more established
Pre-registration claims: Reclaim VAT on goods (4 years) and services (6 months) purchased before registration^[3]

Arguments Against

B2C customers: If your customers are consumers, you must add 20% to your prices or absorb it
Admin burden: Quarterly VAT returns, MTD-compatible software, record-keeping
Cash flow timing: You collect VAT from customers but must pay it to HMRC quarterly

Monitoring the Threshold

HMRC uses a rolling 12-month test — not your financial year. Check your cumulative taxable turnover at the end of every month:

Month End	Rolling 12-Month Turnover	Action Required?
January 2026	£82,000	No — below £90,000
February 2026	£87,500	No — below £90,000
March 2026	£93,000	Yes — notify by 30 April

Planning tip: If you are approaching the £90,000 threshold near your year end, consider whether deferring invoicing (if commercially feasible) could delay compulsory registration. However, never deliberately suppress turnover — HMRC can look through artificial arrangements.

The Flat Rate Scheme

If you register voluntarily with low expenses, consider the Flat Rate Scheme. Instead of tracking input and output VAT separately, you pay a fixed percentage of your gross (VAT-inclusive) turnover. This simplifies admin and can save money for businesses with few VAT-able purchases. See our Flat Rate Scheme article for details.

Deregistration

You can deregister if your taxable turnover drops below the deregistration threshold (£88,000 for 2026/27). You can also deregister if you stop making taxable supplies entirely.

Frequently Asked Questions

What is the VAT registration threshold for 2026/27?

The VAT registration threshold is £90,000 for 2026/27 (increased from £85,000 in April 2024). You must register if your taxable turnover exceeds this in any rolling 12-month period, or if you expect it to exceed the threshold in the next 30 days alone.

Should I register for VAT voluntarily?

It depends. Voluntary registration is beneficial if you have significant VAT-able expenses (you can reclaim input VAT), your customers are VAT-registered businesses (they reclaim the VAT you charge), or you want to appear more established. It is less beneficial if your customers are consumers who cannot reclaim VAT, as your prices effectively increase by 20%.

Can I reclaim VAT from before I registered?

Yes, with limits. You can reclaim VAT on goods purchased up to 4 years before registration (if still on hand at registration) and services purchased up to 6 months before registration. This is useful if you voluntarily register and want to reclaim VAT on start-up costs.

What happens if I register late?

HMRC will register you from the date you should have registered. You will owe VAT on all sales from that date — even if you did not charge VAT to your customers. HMRC may also charge a late-registration penalty.

Sources

VAT registration — GOV.UK
VAT registration thresholds — GOV.UK
Reclaiming VAT on past purchases — GOV.UK