The £90,000 threshold: frozen but still decisive

The VAT registration threshold sits at £90,000 of VAT-taxable turnover in any rolling 12-month period. That figure has been frozen since 1 April 2024 (VATA 1994, Schedule 1) and is unchanged for 2026/27. Before the freeze it had risen roughly every two years; now it stays put while day rates and inflation creep upward, which means more contractors are caught each year without intending to be.

The companion deregistration threshold is £88,000, also frozen. The £2,000 gap between registration and deregistration is deliberate: it prevents a business from bouncing in and out of VAT registration as turnover fluctuates just around one number.

For most limited-company contractors billing at a daily rate to a single corporate client, the £90,000 threshold is reached within the first financial year once day rates exceed roughly £350 to £400 per day on a standard engagement. Understanding exactly when and how the threshold is tested matters, because the penalty for late registration can add up quickly.

How the rolling 12-month test works in practice

The compulsory registration test is not annual, quarterly or tied to the tax year. At the end of every calendar month, you must add up your VAT-taxable turnover for that month and the preceding 11 months. If the running total exceeds £90,000, you have crossed the threshold.

Once you have crossed it, you must notify HMRC within 30 days of the end of the month in which you crossed. HMRC will then register you, usually with an effective date of the first day of the month after the 30-day notification window. So a contractor whose rolling 12-month total first exceeds £90,000 at the end of, say, August 2026 must notify HMRC by 30 September 2026, and will typically be registered from 1 October 2026.

There is also a forward-looking trigger: if at any point you reasonably believe your taxable turnover will exceed £90,000 in the next 30 days alone, you must notify HMRC immediately, and registration takes effect from the start of that 30-day period. This catches a contractor who signs a large new contract that alone will take them over the threshold before month-end.

What counts as VAT-taxable turnover

The test applies to taxable supplies: broadly, goods or services that would be standard-rated (20%), reduced-rated (5%) or zero-rated (0%) for VAT purposes. Most contractor services, whether IT, engineering, finance, legal or management consulting, are standard-rated at 20%. Exempt supplies (such as financial services or insurance, if you happen to supply them directly) do not count toward the registration threshold.

For a typical contractor operating through a personal service company, the relevant figure is your company's gross fee income from clients, before any expenses or salary deductions, ignoring VAT. Day-rate invoices of £500 per day for 220 working days give an annual turnover of £110,000, well above the threshold.

A worked example of the rolling test

Consider a contractor who started trading in September 2025. Monthly fee income is £7,500. By August 2026, the cumulative 12-month total (September 2025 to August 2026) is £90,000. At the end of August 2026, the threshold is crossed for the first time. The contractor must notify HMRC by 30 September 2026 and will be registered from 1 October 2026. Invoices issued from 1 October must show a VAT registration number and charge 20% VAT.

If the same contractor had been earning £9,000 per month, the rolling total would have exceeded £90,000 at the end of October 2025 (10 months in). Notification would have been required by 30 November 2025, with registration effective 1 December 2025. Missing that date by even a few months generates a late-registration penalty on the VAT that should have been charged.

Voluntary registration: the case for registering early

Nothing prevents a contractor from registering for VAT before reaching the £90,000 threshold. Many do, and for good reason. Voluntary registration is available to anyone making, or intending to make, VAT-taxable supplies in the course of a business.

The practical logic is straightforward. Most contractors bill to VAT-registered corporate clients: large private-sector companies, agencies, public bodies that recover VAT. When you charge 20% VAT on your invoice, your client adds it to the invoice total, pays you, then reclaims it from HMRC on their own VAT return. The VAT is cost-neutral to the client. You collect it, hold it until your VAT return is due, and remit it to HMRC, keeping the difference between what you collected and what you paid on your own purchases.

That difference matters. Once registered, you can reclaim input VAT on business costs: accountancy and bookkeeping fees, professional indemnity insurance, software subscriptions, laptop and equipment purchases, business mobile contracts, training and membership subscriptions paid to VAT-registered suppliers. For a contractor spending £5,000 to £10,000 per year on business costs through a VAT-registered accountant and software vendors, voluntary registration delivers a £1,000 to £2,000 input-VAT reclaim each year at no cost to the client.

When voluntary registration makes clear sense

Voluntary registration is most straightforward where all or almost all of your clients are VAT-registered. In that case the 20% VAT surcharge on your invoices is invisible to them (they reclaim it), and you gain the input-VAT recovery benefit. This covers the vast majority of IT, engineering, finance, management consulting and project management contractors billing to mid-market and large corporate clients through agencies.

It is also worth registering voluntarily if you are approaching the threshold within the next 12 months. Registering now, while turnover is still comfortably below £90,000, avoids the risk of a late registration later and lets you start recovering input VAT immediately.

When voluntary registration needs more thought

The picture is different if any of your clients are not VAT-registered. Consumers, charities, small businesses below the registration threshold, and some public-sector bodies cannot recover the VAT you charge. For them, adding 20% VAT to your invoice makes your services genuinely more expensive. If a material portion of your work is for non-VAT-registered clients, the administrative and competitive costs of registration must be weighed against the input-VAT recovery benefit.

In practice, most UK limited-company contractors operate in B2B markets where voluntary registration is straightforward. If you are unsure whether your clients can recover VAT, check with them before registering.

The deregistration threshold: £88,000 and the exit rules

Once registered, you can apply to deregister voluntarily if you have reasonable grounds to expect that your VAT-taxable turnover will not exceed £88,000 in the next 12 months. HMRC will cancel the registration if satisfied, though they may refuse if they believe turnover will remain above the threshold.

A contractor moving from contracting to permanent employment, taking an extended career break, or winding down the company might apply to deregister. Note that on deregistration there may be a deemed supply of any business assets on which VAT was reclaimed (stock, equipment) if their total value at deregistration is such that the deemed VAT charge would exceed £1,000. For most service-based contractors with no significant physical stock, this is unlikely to be a concern.

Deregistration does not apply retroactively: you remain liable for VAT on all supplies made while registered. After deregistration you cannot charge VAT and should not show VAT on invoices.

VAT and your limited-company structure

VAT registration is a company-level obligation, not a personal one. Your limited company registers for VAT, charges VAT on its fee invoices, reclaims input VAT on its business purchases, and submits VAT returns. The VAT is entirely separate from corporation tax and the income tax you pay personally on salary and dividends.

This distinction matters when thinking about the interaction with corporation tax. Your company's fee income for corporation tax purposes is the net fee, excluding VAT. If you invoice a client £10,000 plus £2,000 VAT, the £10,000 is trading income; the £2,000 is held in trust for HMRC and never enters your profit and loss account. Similarly, input VAT reclaimed on costs reduces the net cost for corporation tax. A detailed look at how corporation tax applies to a contractor limited company, including the 19% small profits rate on the first £50,000 and marginal relief to 25% above £250,000, is covered in our guide to corporation tax for a contractor limited company.

Registering: the practical steps

VAT registration for a limited company is done online through HMRC's VAT registration service on gov.uk. You will need:

  • Your company registration number and registered address
  • The date from which registration is required (or the date you wish voluntary registration to take effect)
  • A description of your main business activity and the nature of your taxable supplies
  • An estimate of your expected VAT-taxable turnover in the next 12 months
  • Your company's bank details for repayment of any VAT refund

HMRC typically processes registrations within 40 working days and issues a VAT registration certificate (form VAT 4) with your VAT number. You cannot charge VAT on invoices until you have this number; if registration is delayed beyond your effective date, you should add a line to invoices explaining that VAT will be charged once the number is issued and a supplementary VAT invoice will follow.

Pre-registration input VAT reclaims

Once registered, you can reclaim input VAT on services bought in the six months before your effective registration date, provided those services directly relate to your current taxable business activities. Accountancy fees, software subscriptions and professional memberships paid to VAT-registered suppliers in the six months before you registered are recoverable on your first VAT return. For goods still held in the business at the point of registration, the look-back window extends to four years. Equipment, hardware and similar items bought before registration are recoverable subject to that four-year rule, provided the item is still in business use.

Making Tax Digital for VAT: your digital obligations

Once registered, you must comply with Making Tax Digital for VAT (MTD for VAT). MTD for VAT has applied to all VAT-registered businesses since April 2022, regardless of turnover. There is no opt-out once you are registered.

MTD for VAT requires two things. First, you must keep digital VAT records: your sales and purchase data must be stored digitally, with a digital audit trail from source transactions through to the figures submitted on your VAT return. Second, you must file VAT returns via MTD-compatible software linked to HMRC's systems. Manual entry through the old HMRC portal is not permitted for businesses within MTD.

In practice, almost all contractor accountants now use cloud accounting software (Xero, QuickBooks, FreeAgent and similar) that is MTD-compatible from the outset. If you are setting up a new limited company, your accountant will almost certainly configure MTD-compliant bookkeeping as the default. The key requirement on your side is to keep business records in the software rather than on spreadsheets or in paper files outside the digital chain.

MTD for VAT vs MTD for Income Tax: an important distinction

MTD for VAT and MTD for Income Tax are entirely separate regimes with different scopes and timetables. MTD for VAT is already live for all registered businesses. MTD for Income Tax applies to sole traders and landlords with qualifying income above £50,000 from 6 April 2026, falling to £30,000 from 6 April 2027 and £20,000 from 6 April 2028. Critically, MTD for Income Tax does not apply to limited-company directors or to company profits: a PSC contractor who files Self Assessment only to report salary and dividends is outside MTD for IT, because salary and dividends are not qualifying trading income for those purposes. If you also have sole-trader or rental income above the relevant threshold, MTD for IT applies to that strand; but your company's VAT obligations sit under MTD for VAT, not MTD for IT.

VAT return periods and payment deadlines

HMRC will allocate you a quarterly VAT return period on registration, usually aligned to the end of a calendar quarter (March/June/September/December or offset stagger periods). VAT returns and payments are due one month and seven days after the end of the return period. For a quarter ending 31 March, the return and payment are due by 7 May.

Where HMRC regularly owes you a net VAT repayment (which can happen if you have significant input VAT on large equipment purchases, or in the early months of voluntary registration before output VAT builds up), you can apply for monthly VAT returns. This brings repayments in more quickly and can improve cash flow, though it adds a monthly rather than quarterly compliance task.

Late payment of VAT now attracts the new HMRC penalty regime (introduced January 2023), with a points-based system for late returns and a percentage-based penalty (2.5% to 4% of the unpaid VAT, depending on how late) for late payments. Interest accrues at the Bank of England base rate plus 2.5 percentage points on unpaid VAT from the due date.

Reclaiming input VAT: what contractors can and cannot claim

Once registered, you can reclaim input VAT on costs that relate to your VAT-taxable business activities. For a labour-only IT or engineering contractor, the main recoverable costs are typically:

  • Accountancy, bookkeeping and payroll fees (if your accountant is VAT-registered)
  • Professional indemnity and public liability insurance premiums (where the insurer charges VAT)
  • Business software subscriptions (project management, accounting, email, cloud storage)
  • Computer hardware, monitors and peripherals bought for business use
  • Business mobile phone contracts
  • Professional memberships and subscriptions to VAT-registered bodies
  • Training courses from VAT-registered providers, where the training is wholly for business

You cannot reclaim VAT on costs with a private element unless you make a proportionate adjustment. A mobile phone or laptop used partly for personal use requires an apportionment. Entertaining clients (business entertainment) carries a block on input-VAT recovery in most cases. Travel and accommodation for business trips are generally recoverable; ordinary commuting is not an allowable business expense for either income tax or VAT purposes.

For a detailed treatment of which contractor expenses are allowable for income tax and corporation tax purposes, see our guide to allowable contractor expenses.

Partial exemption: when it applies to contractors

If any of your income is from exempt supplies (financial services, insurance, education, health in certain forms), you cannot reclaim the input VAT that relates to those exempt activities. A contractor who derives some revenue from exempt supplies must carry out a partial exemption calculation to determine how much input VAT is recoverable. For the vast majority of UK contractors in technology, engineering, finance, legal and management consulting, all supplies are standard-rated and partial exemption does not arise. If your work touches on genuinely exempt financial services or insurance distribution, take specialist advice on partial exemption before registering.

What happens to VAT if you are inside IR35

VAT registration and VAT obligations are entirely unaffected by your IR35 status. Whether your engagement is inside IR35 (meaning your company is treated as a deemed employer for income tax and NIC purposes) or outside IR35, your company remains the legal supplier of services to the client or agency. The company still issues VAT invoices, collects output VAT and files VAT returns in the usual way. The fee-payer operates PAYE on the deemed direct payment under Chapter 10, but that is a payroll obligation separate from the company's VAT position.

This point sometimes causes confusion. A common misconception is that being treated as an employee for IR35 purposes removes the company from the VAT system. It does not. The IR35 deemed-payment rules sit in ITEPA 2003 and affect income tax and NIC only. VAT is a supply-by-supply tax governed by VATA 1994, and the company's supply of services is unchanged regardless of how the income is taxed on the individual. Our guide to what IR35 is and how it works covers the deemed-payment mechanics in full.

The Flat Rate Scheme: a linking note

Once registered, one of the first decisions is whether to account for VAT under standard VAT accounting (tracking output and input VAT on every transaction) or under the Flat Rate Scheme (FRS). The FRS is available to businesses with expected taxable turnover of £150,000 or less (excluding VAT) and lets you pay a fixed percentage of your VAT-inclusive gross income to HMRC instead of reconciling individual transactions.

The important caveat for contractors is the limited-cost trader rule: if you spend less than 2% of your VAT-inclusive turnover (or less than £1,000 per year) on goods (not services), you must apply the 16.5% limited-cost-trader flat rate. For a labour-only contractor with minimal goods spend, 16.5% on gross income leaves almost no margin over the standard 20% output rate, which typically means the FRS offers no financial benefit. A full comparison, including who the FRS still suits and when standard accounting is preferable, is in our guide to the VAT flat rate scheme for contractors. The detailed mechanics of the limited-cost-trader calculation are covered in the wave-1 flat rate VAT and the limited-cost trader guide.

Key actions and timing checklist

To stay compliant with the VAT rules as a contractor, the actions below cover the main checkpoints:

  1. Monitor your rolling 12-month turnover every month. Your accounting software should make this straightforward. Flag the month when the cumulative total approaches £80,000 so you have time to prepare.
  2. Notify HMRC within 30 days of exceeding £90,000. Register online via gov.uk. Do not wait for your accountant to do this on your behalf without a clear agreement that they will act promptly.
  3. Consider voluntary registration before you hit the threshold if all or most of your clients are VAT-registered. There is no cost to registering early and immediate input-VAT recovery benefit.
  4. Set up MTD-compatible accounting software before or at the point of registration. Cloud bookkeeping tools used by most contractor accountants handle this automatically.
  5. Decide whether to use the Flat Rate Scheme. For most labour-only contractors, standard VAT accounting is more appropriate, but model the numbers with your accountant before deciding.
  6. Set aside output VAT collected. Keep the VAT you collect in a separate business account or ring-fenced within your main account so it is available for your quarterly payment to HMRC. VAT is not your income; it is collected on behalf of HMRC.

Getting the VAT structure right from day one

VAT registration is one of the first compliance milestones for a new or growing contractor, and getting it right from the outset avoids late-registration penalties and maximises input-VAT recovery. The interaction between VAT, corporation tax and IR35 is one of several areas where specialist contractor accounting support pays for itself quickly. Our services page sets out how we work with limited-company contractors across all these areas, from initial setup through to ongoing tax planning and compliance.