VAT Registration in 2026: When You Must Register and How to Plan for the £90k Threshold
A practical UK guide to the £90,000 VAT registration threshold: how the rolling 12-month test works, the forward-look rule, what happens if you register late, and how to plan pricing before you cross it.
Crossing the VAT registration threshold is one of the few moments where a growing UK business can go backwards financially. Turnover rises, but take-home profit falls, because 20 percent of what customers pay you now belongs to HMRC. Planning for that moment months in advance is the difference between a smooth transition and a painful one.
The two tests you need to know
Registration is compulsory when either test is met.
The backward look (rolling 12 months). At the end of every month, add up your VAT-taxable turnover for the previous 12 months. This is not your accounting year — it is a rolling window. If that total exceeds £90,000, you must register within 30 days of the end of that month, and your registration takes effect from the first day of the second month after you went over.
The forward look (next 30 days alone). If at any point you expect your VAT-taxable turnover in the next 30 days alone to exceed £90,000, you must register immediately, and registration is effective from the date the expectation arose. A single large contract can trigger this even if your annual turnover is modest.
What counts towards the threshold
Standard-rated, reduced-rated and zero-rated sales all count. Exempt supplies (some financial services, certain education and health work) and genuinely out-of-scope income do not. Grants, most bank interest and the sale of capital assets used in the business are generally excluded. Disbursements passed on at cost, correctly documented, sit outside the total; recharged expenses that are part of your service do not.
The exception that saves some businesses
If you go over because of a one-off spike and you can show HMRC that your taxable turnover for the next 12 months will fall below the £88,000 deregistration threshold, you can apply for an exception from registration. This must be requested in writing at the time, with evidence. It is not retrospective wishful thinking, and HMRC will ask what changed.
The real cost of crossing over
Whether crossing the threshold hurts depends almost entirely on who your customers are.
If you sell mainly to VAT-registered businesses, they reclaim the VAT you charge. Your prices effectively stay the same to them, and you gain the ability to reclaim VAT on your own costs. Registration is often a net win.
If you sell to consumers, you face a choice: raise prices by up to 20 percent and risk demand, or absorb the VAT and lose a fifth of your margin. On £120,000 of consumer turnover, absorbing VAT costs roughly £20,000 of gross margin before you reclaim anything on inputs.
Planning moves worth making early
- Model the crossing point now. Build a simple projection of rolling 12-month turnover so you know which month you are likely to breach, not the month after you did.
- Stage your price increase. Moving prices up 6 to 10 percent twice over a year is easier for customers to accept than a single 20 percent jump on registration day.
- Reclaim pre-registration input VAT. You can usually recover VAT on goods still held at registration bought in the previous 4 years, and on services bought in the previous 6 months. Keep those invoices.
- Compare schemes before you file. The Flat Rate Scheme, Cash Accounting and Annual Accounting each change the cash and admin profile. Cash Accounting in particular protects you when customers pay late.
- Check the split-business rules before restructuring. Artificially separating one business into two to stay under £90,000 is subject to HMRC disaggregation rules, and direction notices are issued regularly. Genuine, independently run businesses are fine; a paper split of the same operation is not.
Getting the timing right
Voluntary registration below the threshold makes sense when your customers are all VAT-registered and you carry meaningful input VAT — equipment, stock, subcontractors. It rarely makes sense for a consumer-facing service business with low costs.
Once registered, you are inside Making Tax Digital for VAT from day one: digital records, compatible software and digital links between systems. Set that up before your first return period rather than in the week it is due.
The bottom line
The £90,000 threshold is not a cliff you fall off by accident — it is a date you can see coming if you track rolling turnover monthly. Model it, price for it, and choose your scheme deliberately. The businesses that suffer are the ones that discover the breach three months late, owe VAT on sales they never charged it on, and pay a penalty on top.
This guide is general information, not tax advice. Your circumstances may change the answer.