VAT Registration for Limited Companies: When You Must Register and When You Should

A limited company must register for VAT once its VAT-taxable turnover exceeds £90,000 in any rolling 12-month period, and it may choose to register voluntarily below that figure. VAT registration for a limited company in the UK is triggered by turnover, not by profit or company size, so a young business can cross the threshold quickly. This guide from Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice, explains the compulsory registration rules, the case for registering voluntarily, and the small business VAT schemes that can simplify accounting and improve cash flow in 2026/27.

Key Takeaways

• The VAT registration threshold for 2026/27 is £90,000 of VAT-taxable turnover measured over any rolling 12-month period, not the accounting year.
• A limited company must also register if it expects its taxable turnover to exceed £90,000 in the next 30 days alone.
• The deregistration threshold for 2026/27 is £88,000, allowing a company whose turnover falls to apply to cancel its registration.
• Voluntary VAT registration below £90,000 lets a company reclaim input VAT on purchases, which can benefit businesses selling mainly to VAT-registered customers.
• The VAT Flat Rate Scheme is open to businesses expecting taxable turnover of £150,000 or less, though limited cost traders must use the 16.5% rate.
• Cash Accounting and Annual Accounting schemes are available to businesses with taxable turnover up to £1.35 million, easing cash flow and administration.

When must a limited company register for VAT?

A limited company must register for VAT when its VAT-taxable turnover exceeds £90,000 over any rolling 12-month period, or when it expects to exceed £90,000 in the next 30 days on its own. The test uses a rolling 12 months, so at the end of every month a company should check its taxable turnover for the previous 12 months, not just its annual accounts.

VAT-taxable turnover means the total value of everything the company sells that is not exempt from VAT, including standard-rated, reduced-rated, and zero-rated sales. Once the threshold is crossed, the company must register within 30 days of the end of the month in which it went over, with registration effective from the first day of the second following month. Missing the deadline can lead to penalties and having to account for VAT you did not charge. For a full overview, see our guide to VAT for limited companies.

Registering for VAT does not change how the company's profit is taxed, which our guide to corporation tax rates covers separately.

When should a limited company register for VAT voluntarily?

A limited company should consider voluntary VAT registration when it buys significant VAT-bearing goods or services, or sells mainly to other VAT-registered businesses that can reclaim the VAT. Voluntary registration is available at any turnover level below £90,000 and allows the company to reclaim input VAT on eligible purchases.

Voluntary registration makes most sense when your customers are themselves VAT registered, because charging VAT does not increase their real cost while you recover VAT on your own expenses, equipment, and stock. The main drawback appears when customers are consumers or non-VAT-registered businesses, because adding 20% VAT either raises your prices or squeezes your margin. Registration also brings the obligation to file VAT returns, usually quarterly, and to keep digital records under Making Tax Digital for VAT.

Which small business VAT schemes can help?

Several small business VAT schemes exist to simplify VAT accounting and improve cash flow, and the right one depends on turnover, margins, and how quickly customers pay. The three most relevant to small limited companies are the Flat Rate Scheme, Cash Accounting, and Annual Accounting.

The Flat Rate Scheme, open to businesses expecting taxable turnover of £150,000 or less, lets a company pay HMRC a fixed percentage of its VAT-inclusive turnover instead of calculating VAT on every sale and purchase. Since April 2024, limited cost traders, typically service businesses with low goods spend, must apply the 16.5% rate, which removes much of the benefit. Cash Accounting, available up to £1.35 million of taxable turnover, means you account for VAT only when customers pay rather than when you invoice. Annual Accounting, also up to £1.35 million, replaces quarterly returns with one annual return and interim instalments.

Worked example: the cost of registering when selling to consumers

Consider a limited company with turnover of £96,000 selling design services to individual consumers. Once registered, it must add 20% VAT, so a £1,000 job becomes £1,200. If customers will not absorb the increase, the company effectively earns £833 net of VAT per £1,000 job, a £167 reduction per sale, before reclaiming input VAT.

If the same company uses the Flat Rate Scheme as a limited cost trader at 16.5%, it pays HMRC 16.5% of the gross £1,200, which is £198, while charging customers £200. That leaves a £2 surplus per job but no meaningful input VAT recovery, showing why the customer base, not just turnover, should drive the decision.

Frequently Asked Questions

What is the VAT registration threshold for 2026/27?

The VAT registration threshold for 2026/27 is £90,000 of VAT-taxable turnover measured over any rolling 12-month period. A limited company must register once it exceeds this figure, or if it expects to exceed £90,000 in the next 30 days alone. The deregistration threshold, at which a company can apply to cancel its registration, is £88,000.

Can a limited company register for VAT below the threshold?

Yes. A limited company can register for VAT voluntarily at any turnover level below £90,000. Voluntary registration lets the company reclaim input VAT on its purchases and can suit businesses selling mainly to other VAT-registered customers. The trade-off is charging VAT to customers and filing regular VAT returns under Making Tax Digital for VAT.

What is the VAT Flat Rate Scheme?

The VAT Flat Rate Scheme lets a business pay HMRC a fixed percentage of its VAT-inclusive turnover instead of calculating VAT on each sale and purchase. It is open to businesses expecting taxable turnover of £150,000 or less. Since 1 April 2017, limited cost traders must use the 16.5% rate, which significantly reduces the scheme's benefit for most service businesses.

Do VAT-registered companies have to use Making Tax Digital?

Yes. All VAT-registered businesses, regardless of turnover, must comply with Making Tax Digital for VAT. This means keeping digital VAT records and submitting VAT returns to HMRC using compatible software. The obligation applies from the date of registration, so a newly registered limited company should have compliant software in place from the outset.

How long do I have to register once I cross the threshold?

You must register within 30 days of the end of the month in which your rolling 12-month taxable turnover exceeded £90,000. Registration then takes effect from the first day of the second month after you went over. If you expect to exceed £90,000 within the next 30 days alone, you must register by the end of that 30-day period.

How Blue Tick Can Help

Blue Tick Accountants helps limited company owners decide whether and when to register for VAT, choose the most cost-effective scheme, and set up Making Tax Digital compliant record-keeping. Getting the timing and scheme right can protect your margins and avoid unexpected VAT bills or penalties. Head to our website and book a meeting now.

Conclusion

VAT registration becomes compulsory for a limited company once VAT-taxable turnover passes £90,000 on a rolling 12-month basis, but the smarter question is often whether to register voluntarily and which scheme to use. The answer turns on who your customers are and how much VAT you incur on purchases. Review your turnover monthly, model the impact on your prices and margins, and take advice before registering so the decision strengthens rather than erodes your bottom line.

About the Author

This guide was written by Leon, founder of Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice that helps limited company owners across the UK manage VAT, corporation tax, and director pay efficiently. It was last reviewed for the 2026/27 tax year.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.

Related reading: The VAT Flat Rate Scheme: Is It Still Worth It for Your Limited Company?.