VAT Registration Threshold and Flat Rate Scheme 2026: When to Register and Whether Flat Rate Saves You Money

The registration threshold: £90,000

For 2026/27, the VAT registration threshold is £90,000 of taxable turnover. This isn't a simple annual figure measured from January to December or against your accounting year — it's assessed on a rolling 12-month basis, meaning you need to check your turnover for any trailing 12-month period, not just your formal accounting year.

Missing a compulsory registration deadline can result in penalties and having to account for VAT retrospectively on sales you didn't charge VAT on — so tracking your rolling turnover carefully is essential once you're getting close to £90,000.

Should you register voluntarily below the threshold?

Many businesses register for VAT before they're legally required to. Reasons this can make sense include:

• Reclaiming input VAT: if you incur significant VAT on business purchases, equipment, or services, registering lets you reclaim it, even though you must then also charge VAT on your own sales.
• Credibility with VAT-registered clients: some B2B clients see VAT registration as a signal of business scale and legitimacy — and if your customers are themselves VAT-registered businesses, charging VAT costs them nothing extra since they reclaim it too.
• Avoiding a sudden shock later: registering in advance of crossing the threshold can smooth the transition into VAT accounting rather than doing it reactively under time pressure.

The trade-off is the ongoing compliance burden — VAT returns (usually quarterly), record-keeping, and Making Tax Digital-compliant software — plus the fact that if your customers are mostly consumers or non-VAT-registered businesses, charging VAT effectively increases your prices to them by 20% unless you absorb it into your margin.

How the Flat Rate Scheme works

The standard approach to VAT is to charge VAT on your sales (output VAT) and reclaim VAT you've paid on business purchases (input VAT), paying HMRC the difference. The Flat Rate Scheme (FRS) offers a simplified alternative for eligible small businesses: instead of tracking input VAT purchase by purchase, you pay HMRC a fixed percentage of your gross (VAT-inclusive) turnover.

Key mechanics

• The flat rate percentage varies by trade sector — HMRC publishes a table of percentages for different types of business (for example, categories like catering, IT consultancy, or retail each have their own published rate).
• You still charge your customers VAT at the standard rate (usually 20%) on your invoices — the flat rate percentage only affects what you hand over to HMRC, not what you charge.
• Businesses get a 1% discount on their applicable flat rate percentage during their first year of VAT registration.
• Under the FRS, you generally cannot reclaim input VAT separately on most purchases (with an exception for certain capital asset purchases above a set value) — the flat rate percentage is meant to already factor in a typical level of input VAT for your sector.

The "limited cost trader" rule

This rule was introduced specifically because HMRC found many low-cost service businesses were benefiting more from the Flat Rate Scheme than the standard VAT system intended, since their actual input VAT was minimal but their sector's flat rate assumed more typical costs.

When the Flat Rate Scheme saves you money — and when it doesn't

The general principle: the Flat Rate Scheme tends to favour businesses with low costs and purchases relative to their turnover, since the flat percentage they pay is often lower than what standard VAT accounting would produce for such a business. Businesses with substantial input VAT to reclaim — heavy purchasers of stock, materials, or subcontracted services — are usually better off under standard VAT accounting, where they can reclaim that input VAT in full.

Practical steps

1. Track your rolling 12-month taxable turnover monthly once you're within reach of £90,000, and also watch for any single-month spike that could trigger the 30-day rule.
2. Model both standard VAT accounting and the Flat Rate Scheme using your actual sector percentage and your typical input VAT, rather than assuming the FRS is automatically simpler or cheaper.
3. Check whether you'd be a limited cost trader before opting into the FRS — this single rule can flip the scheme from beneficial to costly for many service businesses.
4. Review your choice periodically — as your cost structure changes (for example, if you start buying more stock or equipment), the FRS may become less favourable even if it made sense when you first registered.

The bottom line

VAT registration becomes compulsory once your taxable turnover crosses £90,000 on a rolling 12-month basis, or you expect to cross it within 30 days — but voluntary registration below that threshold is a genuine option worth modelling if you have significant input VAT to reclaim or B2B clients who won't mind the added VAT. Once registered, the Flat Rate Scheme can simplify your accounting and even save money if your costs are low relative to turnover, but the limited cost trader rules and the loss of input VAT recovery mean it isn't automatically the cheaper option — compare it against standard VAT accounting for your specific numbers before choosing.