Understanding VAT Registration Thresholds

Rates, thresholds, and deadlines mentioned below are correct as of the 2025/26 UK tax year. Tax rules change — always confirm current figures with HMRC or speak to us before acting.

VAT registration is one of those things that feels optional until suddenly it isn't. Here's how the threshold actually works.

The current threshold

You must register for VAT once your taxable turnover exceeds £90,000 in any rolling 12-month period — not the tax year, any 12 months. This is a common trip-up: businesses check their turnover once a year and miss that they crossed the threshold mid-year.

What counts toward the threshold

Taxable turnover includes standard, reduced, and zero-rated sales — but not exempt supplies. It's total sales, not profit, which surprises some business owners with tight margins who assumed they were nowhere near the threshold.

What happens once you're over

You must register within 30 days of the end of the month you went over the threshold, and you become liable to charge VAT from the first day of the second month after that. Missing this triggers penalties, and HMRC can backdate the VAT you should have charged — which you may not be able to recover from customers after the fact.

Should you register voluntarily, before you're forced to?

Sometimes, yes. Reasons to consider voluntary registration:

You mostly sell to VAT-registered businesses who can reclaim the VAT anyway — so charging it costs your customers nothing
You want to reclaim VAT on business purchases and setup costs
Being VAT-registered can look more established to certain clients

Reasons to hold off:

Your customers are mostly individuals or non-VAT-registered businesses who'll feel the 20% price increase directly
The extra admin and quarterly filing isn't worth it yet at your scale

The Flat Rate Scheme

Smaller businesses (turnover under £150,000) can opt into the Flat Rate Scheme, paying a fixed percentage of turnover rather than tracking VAT on every transaction — simpler admin, though not always the cheaper option depending on your expense profile.

The threshold is a trigger, not a target. Watching your rolling 12-month turnover — not just your annual figure — is what actually keeps you compliant.

If you're anywhere near £90,000 in rolling turnover, it's worth tracking monthly rather than finding out after the fact.

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