VAT registration is one of the most consequential decisions a small business will make, and one of the most common conversations a UK accountant will have with clients in any given year. The threshold has been broadly stable in recent years, but the surrounding regime - registration mechanics, voluntary registration economics, the schemes available, and the Making Tax Digital for VAT regime - has continued to evolve.
This guide pulls together what UK practitioners need to keep in mind in 2026: the headline thresholds, the rules around taxable turnover and rolling tests, voluntary registration, scheme selection, MTD for VAT obligations, and the deregistration position. It is not a substitute for HMRC's VAT notices but it should give you a usable mental map for advising clients at scale.
The headline thresholds
From 1 April 2024, the VAT registration threshold has been £90,000 of taxable turnover in any rolling twelve-month period, with a separate forward-looking test that catches businesses that expect to exceed the threshold in the next thirty days alone. The deregistration threshold sits at £88,000 of taxable turnover in the next twelve months.
The threshold is set by reference to taxable turnover - the value of standard-rated, reduced-rated, and zero-rated supplies - not by reference to profit and not by reference to total income. Exempt and outside-the-scope income does not count towards the threshold.
The two registration tests
Two tests determine whether a business must register. The historic test looks back at the rolling twelve-month period ending at the end of any month and asks whether taxable turnover in that period exceeded £90,000. If it did, the business must notify HMRC within thirty days of the month-end and is registered from the first day of the second month after the threshold was crossed.
The future test looks forward and asks whether the business expects to exceed £90,000 of taxable turnover in the next thirty days alone. This is the test that catches businesses with sudden large contracts. Registration applies from the date the expectation arose - there is no thirty-day grace period for the future test.
Voluntary registration
Businesses below the threshold can register voluntarily. The economics depend on the customer base and the input VAT position:
- Where customers are themselves VAT-registered, voluntary registration is generally neutral to positive - customers recover the VAT charged, and the business recovers input VAT on costs
- Where customers are private consumers, voluntary registration is usually negative - it adds 20% to the headline price without an offsetting recovery for the customer
- Where the business has significant input VAT (high cost base, capital expenditure, or imports) voluntary registration recovers cash that would otherwise be lost
- Some businesses register voluntarily for reputational reasons - a B2B service business may be perceived as more substantial if it operates above the VAT line
The schemes available
Standard VAT accounting is the default. Three principal schemes provide alternatives:
The Flat Rate Scheme allows businesses with taxable turnover up to £150,000 (excluding VAT) to apply a sector-specific flat rate to their VAT-inclusive turnover, in lieu of recovering input VAT separately. It simplifies the bookkeeping but can be advantageous or disadvantageous depending on the input VAT position. The introduction of the limited cost trader rate in 2017 made the scheme materially less attractive for service businesses with low purchases.
The Cash Accounting Scheme accounts for VAT on the basis of receipts and payments rather than invoices. It is available to businesses with taxable turnover up to £1.35 million and is particularly useful for businesses with significant credit-funded customers.
The Annual Accounting Scheme requires only one VAT return per year, supported by monthly or quarterly interim payments. It is available to businesses with taxable turnover up to £1.35 million and suits businesses with stable, predictable VAT positions.
MTD for VAT
Making Tax Digital for VAT is the established regime for all VAT-registered businesses, regardless of turnover. Records must be kept digitally and returns must be submitted via HMRC-compatible software using the MTD APIs. A spreadsheet plus bridging software is acceptable; manual entry into the HMRC portal is not.
Penalties for late MTD submissions sit under the points-based late submission penalty regime, with points accumulating across the rolling submission window and a £200 fixed penalty applying once the threshold is reached. The points-based regime replaced the older default surcharge in 2023 and is generally regarded as a more proportionate response to occasional lapses.
Pre-registration input VAT
Once registered, a business can recover input VAT on goods on hand at the registration date (purchased up to four years before registration and still held) and on services received up to six months before registration. This is a meaningful relief for businesses that have made significant pre-registration investment.
Documentation is critical. The pre-registration input VAT claim must be supported by valid VAT invoices and evidence that the goods and services were used for the taxable business activity. A common error is claiming on assets that have been partly used or sold before registration - the recoverable amount is restricted to the remaining business use.
International supplies
Post-Brexit, the VAT treatment of supplies to and from the EU has changed substantively. Goods exported from the UK to overseas customers are zero-rated for VAT, subject to obtaining and retaining evidence of export. Goods imported into the UK attract import VAT, with postponed VAT accounting available to most VAT-registered importers to defer the cash flow impact to the next VAT return.
Services supplied to overseas business customers are generally outside the scope of UK VAT under the place of supply rules. Services supplied to overseas private consumers may be subject to UK VAT or to overseas VAT depending on the nature of the service and the location of the consumer.
Deregistration
A business can deregister voluntarily if it expects its taxable turnover in the next twelve months to fall below the deregistration threshold of £88,000. Compulsory deregistration applies when the business ceases to make taxable supplies - typically because it ceases trading or transfers as a going concern.
Deregistration triggers a deemed supply of any goods on hand on which input VAT has been recovered, broadly equivalent to a final stock take for VAT purposes. The output VAT due on the deemed supply is included in the final VAT return.
Common errors and HMRC enquiries
The most common errors in the VAT space involve missed forward-test registrations (a sudden large contract pushes the business over the threshold in a single month), incorrect partial exemption calculations for businesses with both taxable and exempt supplies, and pre-registration input VAT claims that are not properly supported.
HMRC VAT enquiries are typically risk-triggered - large input VAT claims, unusual sector profiles, or significant variation from prior period returns. A clean VAT account, with reconciliations performed quarterly and any unusual items documented as they arise, makes any subsequent enquiry materially shorter and cheaper to resolve.
How Accupe supports VAT compliance
Accupe handles VAT compliance alongside the rest of the practice workflow. Xero and Zoho Books integrations pull the underlying records, Smart Boards track VAT return deadlines across the full client portfolio, the AI document analyser reads purchase invoices with source citation, and the client portal handles secure exchange of records during the period. Compliance Radar surfaces clients approaching the registration or deregistration thresholds so conversations happen before HMRC raises them, and per-firm pricing keeps the cost predictable as the firm grows.