VAT Registration Threshold: A Guide for Small Businesses

Value Added Tax (VAT) is a consumption tax charged on most goods and services sold in the UK. Businesses registered for VAT charge it to their customers and pay it to HMRC, offsetting the VAT they have paid on their own purchases. Knowing when you must register, and whether voluntary registration makes sense, is fundamental to managing a small business.

The VAT Registration Threshold: £90,000

You must register for VAT if your VAT-taxable turnover in any rolling 12-month period exceeds £90,000. This threshold applies from 1 April 2024 (increased from £85,000) and remains at £90,000 for 2025-26.

“VAT-taxable turnover” means the total value of goods and services you supply that are liable for VAT — at either the standard rate (20%), reduced rate (5%), or zero rate (0%). Exempt supplies (such as insurance, certain education, and financial services) do not count towards the threshold.

The Rolling 12-Month Rule

The threshold is not a calendar year test — it is assessed on a rolling 12-month basis. You must register if:

• Your taxable turnover in the past 12 months exceeds £90,000 at any point, or
• You expect your taxable turnover to exceed £90,000 in the next 30 days (forward-looking test)

Once either test is met, you must notify HMRC and register for VAT.

When Registration Takes Effect

If you exceed the threshold based on past turnover, you must register and begin charging VAT from the first day of the second month after the month in which you exceeded the threshold. For example, if you exceed the threshold in May, your effective registration date is 1 July.

If you exceed the threshold under the forward-looking test (expecting to exceed £90,000 in the next 30 days), registration must take effect from the beginning of that 30-day period.

Consequences of Late Registration

Failing to register on time can be costly. HMRC charges a penalty based on the VAT you should have collected from the date you were required to register. Penalties can be:

• 5% of net VAT due if late by up to 9 months
• 10% if late by 9–18 months
• 15% if late by 18 months or more

You will also be required to pay all the VAT you should have collected, which may be difficult to recover from customers after the fact — since you did not add it to their invoices at the time.

The Deregistration Threshold

Once registered, you can apply to deregister if your taxable turnover falls below the deregistration threshold of £88,000 and you expect it to remain below this level. Note this is £2,000 below the registration threshold, designed to prevent businesses from constantly registering and deregistering around the boundary.

Voluntary VAT Registration

You can choose to register for VAT even if your turnover is below £90,000. Voluntary registration makes sense in certain situations.

Benefits of Voluntary Registration

Reclaiming input VAT: Once registered, you can reclaim the VAT on your business purchases. If your business buys significant goods or services with VAT attached, voluntary registration reduces your costs. This is especially valuable for:

• Businesses that sell to other VAT-registered businesses (who can reclaim the VAT you charge)
• Businesses with high startup costs and capital expenditure

Professional credibility: Some clients or customers assume VAT-registered businesses are more established. A VAT number can signal credibility, especially in B2B markets.

Retrospective VAT claims: On registration, you can reclaim VAT on goods purchased in the four years before registration (if still in use) and services purchased in the six months before registration.

Drawbacks of Voluntary Registration

Increased costs for end consumers: If you sell to consumers (B2C) who cannot reclaim VAT, adding 20% VAT increases your prices and may make you less competitive against unregistered competitors.

Administrative burden: VAT registration requires:

• Charging VAT on all taxable supplies
• Issuing VAT invoices
• Maintaining detailed VAT records
• Submitting VAT returns (usually quarterly) under Making Tax Digital
• Reconciling and paying VAT to HMRC

For small businesses with limited accounting resources, this overhead is significant.

Standard VAT Accounting

Under standard VAT accounting, you account for VAT in the period when invoices are issued (accruals basis). Most businesses file VAT returns quarterly and pay any VAT owed to HMRC within one month and seven days of the quarter end.

Cash Accounting Scheme

Businesses with taxable turnover below £1.35 million can use cash accounting, where VAT is accounted for when payments are received or made — rather than when invoices are issued. This helps with cash flow, particularly for businesses with customers who pay late.

The Flat Rate Scheme

The Flat Rate Scheme (FRS) is designed to simplify VAT administration for smaller businesses. Instead of calculating the exact VAT you have charged and reclaiming the exact VAT you have paid, you apply a single flat rate percentage to your gross (VAT-inclusive) turnover and pay that amount to HMRC.

Eligibility: Businesses with expected taxable turnover of no more than £150,000 (excluding VAT) in the next 12 months.

Flat Rate Percentages

The flat rate varies by business sector. Some examples:

A 1% discount applies in your first year of VAT registration.

How the Flat Rate Works

Example: An IT consultant charges a client £1,000 plus VAT = £1,200 invoice total. Under the flat rate scheme (14.5%):

VAT paid to HMRC = £1,200 × 14.5% = £174

VAT charged to client = £200

Difference retained: £26 — the FRS profit margin.

However, under the FRS, you generally cannot reclaim VAT on purchases (except for certain capital assets over £2,000). If your business has significant input VAT, the standard method may be more beneficial.

Limited Cost Trader Test

HMRC introduced a 16.5% “limited cost trader” flat rate for businesses whose VAT-inclusive purchases on goods cost less than 2% of gross turnover, or less than £1,000 per year. This applies to service-based businesses that spend little on physical goods, and largely eliminated the financial benefit of the FRS for many consultants and service providers.

Annual Accounting Scheme

Businesses with taxable turnover up to £1.35 million can use annual accounting, filing a single VAT return per year rather than four quarterly returns. Interim payments (direct debits of 10% of estimated VAT liability, paid monthly) are made throughout the year, with a balancing payment due with the annual return.

Worked Example: Impact of VAT Registration

A freelance graphic designer has annual turnover of £80,000 and annual purchases of £10,000 (including £1,667 VAT). They consider voluntary registration.

If registered (charging 20% VAT to clients):

• Additional revenue collected from clients: £16,000 VAT per year
• Input VAT reclaimed on purchases: £1,667
• Net VAT payable to HMRC: £16,000 − £1,667 = £14,333
• Clients who are VAT-registered are unaffected (they reclaim the VAT). Clients who are not VAT-registered effectively pay 20% more.

For this designer, whether voluntary registration makes sense depends almost entirely on whether their clients are themselves VAT-registered businesses.

Key Takeaways

• Mandatory registration threshold is £90,000 of taxable turnover in any rolling 12-month period.
• Failure to register on time leads to penalties and backdated VAT liability.
• Voluntary registration benefits businesses that sell to other VAT-registered customers or have significant input VAT.
• The Flat Rate Scheme simplifies administration but the 16.5% limited cost trader rate has reduced its financial benefits for service businesses.
• VAT returns must be filed under Making Tax Digital using compatible software.

Use the VAT calculator to calculate the VAT element of any transaction, or to check net and gross amounts at standard, reduced, and zero rates.