Tax & HMRC

Crossing the £90k VAT threshold: what happens next

The 30-day rule, the Flat Rate Scheme, and how to price after you register.

Startup Edit Team04 Apr 20268 min read

Hitting the £90,000 VAT threshold is a significant milestone for any UK business. It signals growth but also brings new responsibilities that can feel daunting. Understanding what happens next — from the 30-day VAT registration rule to how to handle your pricing and accounting — is crucial to staying compliant and protecting your profit margins. This guide breaks down the essential steps, offers practical advice, and explains key VAT concepts specifically for UK startups, freelancers, and side hustlers.

Understanding the £90,000 VAT Threshold and the 30-Day Rule

The VAT threshold in the UK is currently set at £90,000. This means if your taxable turnover — basically the income you make from VATable goods or services — exceeds £90,000 in any 12-month rolling period, you must register for VAT with HMRC. It’s not just at the end of a tax year; HMRC expects you to monitor your turnover monthly and act promptly. You then have 30 days from the day you exceed the threshold to register for VAT. Missing this deadline can lead to penalties and interest charges, so it’s vital to stay on top of your income.

Taxable turnover includes most sales but excludes VAT-exempt income. For example, if you run a consultancy and your fees total £92,000 within 12 months, you must register. However, if a portion of your income is from VAT-exempt activities, like certain financial services, you need to subtract that from your total when calculating if you’ve crossed the threshold.

See alsoThe 'First-Time' VAT guide: When to register and how it works
Heads up Keep an eye on your turnover

The 30-day rule means you have a very short window to act. Set up monthly checks on your turnover, ideally using accounting software like Xero or QuickBooks, to ensure you spot when you hit the £90k mark. Ignorance is not an excuse with HMRC.

How to Register for VAT and What to Expect

Registering for VAT is straightforward but requires attention to detail. You can register online via the HMRC website, which is the quickest method. Upon registration, HMRC will issue you a VAT registration number and specify your VAT accounting scheme. You’ll also receive details on when you must submit your first VAT return and payment.

Your VAT registration date is typically the day you cross the £90,000 threshold. This date sets the timeline for your first VAT return period, which is usually quarterly, unless you apply for a different arrangement. It’s important to keep all sales and purchase records from this date since you’ll need them to complete your VAT returns accurately.

Remember that once registered, you must charge VAT on your sales, submit VAT returns on time, and pay any VAT due to HMRC. You can also reclaim VAT on eligible business expenses, which can improve your cash flow if managed well.

Exploring VAT Accounting Options: The Flat Rate Scheme

VAT accounting can seem complex, but there are schemes designed to simplify the process. The Flat Rate Scheme (FRS) is a popular choice for many small businesses as it reduces the administrative burden. Instead of calculating VAT on every sale and purchase, you pay a fixed percentage of your VAT-inclusive turnover to HMRC.

The percentage you pay depends on your business sector. For example, if you’re a consultant or IT professional, the flat rate might be around 14.5%, whereas for retail or catering it could be lower. Under FRS, you cannot reclaim VAT on most purchases, except for capital assets over £2,000, but the simplicity often outweighs this drawback.

  • You charge VAT at the standard rate (usually 20%) on your invoices.
  • You keep the difference between the VAT you charge customers and the flat rate percentage you pay to HMRC.
  • You don’t reclaim VAT on most purchases, simplifying bookkeeping.

Choosing the FRS can improve your cash flow if your business has few VATable purchases or you mainly sell to VAT-registered customers who can reclaim VAT themselves. However, if you have significant VAT on purchases, the standard VAT accounting method might be better.

Money tip Is the Flat Rate Scheme right for you?

Evaluate your input VAT versus output VAT carefully. Use HMRC’s VAT flat rate tool or consult an accountant before opting in. Remember, you can switch schemes annually but must do so at the start of your VAT accounting period.

Pricing After VAT Registration: What You Need to Know

Once registered for VAT, you must add VAT to your prices unless you explicitly state that your prices are VAT inclusive. This can affect your competitiveness and customer perception, so it’s vital to communicate clearly. For instance, a freelance graphic designer charging £1,000 before VAT must now charge £1,200 if VAT is added on top.

Business-to-business (B2B) sales to VAT-registered customers are usually straightforward because your clients can reclaim the VAT. However, for business-to-consumer (B2C) sales, the extra 20% might put off some customers or require you to reconsider your pricing strategy. Many businesses choose to keep prices the same and absorb the VAT cost, which reduces their profit margin.

You should update all your invoices, websites, and marketing materials to reflect your VAT registration status and pricing changes. Clear invoicing that shows the VAT breakdown is a legal requirement and helps your customers understand the charges.

Practical Steps to Stay Compliant and Efficient Post-Registration

Staying compliant with VAT regulations is essential to avoid fines or investigations by HMRC. The first step is setting up robust accounting processes. Using cloud accounting software with integrated VAT features will automate much of the record-keeping and VAT return filing.

Keep all sales invoices, receipts for purchases, and VAT records for at least six years as HMRC can request to review these at any time. Organise your records by VAT period to make returns straightforward and ensure you don’t miss any deadlines.

  • Submit VAT returns quarterly, unless you agree on a different schedule with HMRC.
  • Pay VAT due on time to avoid interest and penalties.
  • Review your pricing regularly to ensure profitability after VAT.
  • Consider professional advice if your VAT affairs become complex.

Many founders find VAT registration initially daunting but quickly adapt by establishing clear routines and workflows. Founder James Clarke, who runs a successful London-based digital marketing agency, shares his experience:

""Crossing the VAT threshold felt like a big leap, but once we registered and started using the Flat Rate Scheme, managing VAT became much simpler. We adjusted our prices carefully to remain competitive and now VAT compliance is just part of our monthly routine.""

Tip Top tip for new VAT registrants

Start VAT registration preparations early by reviewing your turnover monthly and consulting an accountant as you approach the £90k threshold. Early planning helps prevent rushed decisions and costly mistakes.

Affiliate links — we may earn a commission at no cost to you.

More from Tax & HMRC

Keep reading

You might also like