Voluntary VAT Registration Under £90,000: Benefits, Risks and How to Register
Registering for VAT voluntarily below the £90,000 threshold can help you reclaim input VAT and appear more credible to B2B clients. But there are real risks too. Find out if it makes sense.
Voluntary VAT registration is a decision that many small business owners face as they grow but have not yet reached the £90,000 compulsory threshold. In the right circumstances -- particularly for B2B service businesses with significant input VAT costs -- registering voluntarily can generate a net financial benefit and a credibility boost. In the wrong circumstances -- for example, a small business selling primarily to members of the public -- it can add unwanted cost, paperwork, and competitive disadvantage. This guide helps you assess whether voluntary registration is right for your business.
Who should consider voluntary VAT registration?
Voluntary registration makes most sense for businesses in these situations:
High input VAT relative to turnover: If you spend heavily on materials, equipment, or services that carry 20% VAT, reclaiming that VAT can significantly reduce your costs. A small marketing agency buying £20,000 of design software, computing equipment, and professional subscriptions per year incurs £4,000 in input VAT. Registering for VAT allows this to be reclaimed.
Primarily B2B customer base: If all or most of your customers are VAT-registered businesses themselves, they can reclaim the VAT you charge them. The 20% VAT on your invoice is cost-neutral for them. In this case, the cost of voluntary registration falls entirely on you (administration) rather than your customers.
Building credibility: A VAT number signals to business customers that you have a certain scale of operation. Some procurement departments and larger corporate clients will not trade with suppliers who are not VAT-registered, viewing it as a proxy for size and professionalism.
Capital-intensive start-up phase: If you are in the early stages of a business and making significant capital purchases (equipment, vehicles, shopfitting) before turnover builds, registering voluntarily allows you to recover the input VAT on these items immediately.
Who should be cautious about voluntary registration?
Predominantly B2C businesses: If you sell to individuals (not businesses), your customers cannot reclaim VAT. Adding 20% VAT to your prices either makes you more expensive than unregistered competitors or forces you to absorb the VAT by cutting your effective price. For beauty therapists, tradespeople doing home repairs, personal trainers, and similar B2C services, voluntary registration is often a competitive disadvantage.
Very low overhead businesses: If your business costs are mainly labour (your own time) with minimal VATable purchases, there is little input VAT to reclaim. The administration burden of quarterly VAT returns may not justify the small reclaim.
Businesses with mixed B2C/B2B customers: Where your customer base is split, you need to model the numbers carefully. How much additional input VAT can you reclaim? How many B2C customers might you lose to cheaper unregistered competitors?
How to register: the process
Voluntary VAT registration is done online through your Government Gateway account:
- Log in to your business tax account (or create one if you do not have one).
- Select "Register for VAT."
- Complete the online VAT1 registration form with your business details, turnover estimates, and the effective date of registration you want.
- Submit the form.
HMRC processes most registrations within 30 working days and issues your VAT registration number by letter. Once you have your number, you must:
- Add your VAT number to all invoices.
- Start charging VAT from the effective date.
- Sign up for Making Tax Digital for VAT and use compatible software.
- File quarterly (or monthly) VAT returns.
Effective date: backdating to reclaim input VAT
When you register voluntarily, you can request an effective date earlier than the date of application. This allows you to claim pre-registration input VAT:
- Goods still held at registration: VAT paid within the 4 years before the effective date of registration can be reclaimed if the goods are still in your possession.
- Services received: VAT paid on services received within 6 months before the effective date can be reclaimed.
This is a one-time benefit when you first register. The earlier your effective date, the more historical input VAT you can potentially reclaim. However, there is a counterpart: you must also account for output VAT on any taxable sales made from that earlier date (even if you did not charge VAT to customers at the time, because you were not yet registered). This means your invoices for that historic period may have an implicit VAT liability to settle.
Making Tax Digital (MTD) for VAT registrants
All VAT-registered businesses must comply with Making Tax Digital for VAT. This means:
- Keeping digital VAT records (using MTD-compatible accounting software such as QuickBooks, Xero, FreeAgent, or Sage).
- Filing VAT returns directly from the software to HMRC (not via the old HMRC online portal).
- Maintaining a "digital link" between your records and your VAT return submission.
MTD-compatible software typically costs £10-£30 per month. This is an ongoing cost of being VAT-registered that should be factored into the voluntary registration decision.
Deregistration: how to exit
If you registered voluntarily and your turnover remains below £90,000 (or you decide the VAT registration is not working for you), you can apply to deregister. The deregistration threshold is £88,000 -- slightly below the registration threshold to prevent the system being gamed.
On deregistration, you must:
- File a final VAT return.
- Potentially account for output VAT on business assets held on which you claimed input VAT (output VAT based on market value of the asset at deregistration date, if the total value exceeds £1,000).
The asset output VAT on deregistration can be a sting -- particularly if you registered to reclaim VAT on a significant asset (like a computer or van) and then deregister shortly after.
VAT Calculator
Add or remove VAT from any amount. Supports 20%, 5% and 0% UK VAT rates.
Open VAT calculatorFrequently asked questions
What is the VAT registration threshold in 2026/27?
The compulsory VAT registration threshold is £90,000 of taxable turnover in any rolling 12-month period. If your taxable turnover exceeds £90,000, you must register for VAT. Below this threshold, registration is voluntary.
What are the main benefits of voluntary VAT registration?
The main benefits are: recovering input VAT on purchases and expenses (potentially thousands of pounds per year), enhanced credibility with B2B clients (a VAT number signals an established business), the ability to backdate reclaims on pre-registration costs, and the option to join the VAT Flat Rate Scheme. For businesses with significant input VAT (equipment, materials, professional services), the recovery can be very valuable.
What are the main risks of voluntary VAT registration?
The main risks are: you must charge VAT at 20% to customers (making you more expensive if they cannot reclaim it), administration burden (filing quarterly VAT returns, keeping VAT records), risk of errors and HMRC penalties, and being locked into VAT registration while your turnover stays low. B2C businesses (selling to individuals) typically find voluntary registration disadvantageous because consumers cannot reclaim the VAT.
Can I backdate VAT registration to reclaim input VAT on past purchases?
Yes. You can request an effective date of registration up to 4 years in the past for VAT on goods you still hold, and up to 6 months in the past for VAT on services. When you register voluntarily, you can choose an effective date in the past to capture recent VAT costs. This is particularly useful if you have recently made large capital or stock purchases.
What is the process for registering for VAT voluntarily?
You register online through your Government Gateway account. The VAT1 form asks for basic business information, estimated turnover, and the effective date of registration you want. HMRC usually processes registrations and issues a VAT registration number within 30 working days. Once registered, you must charge VAT on all standard-rated supplies from your effective date.
Can I deregister from VAT if I regret registering voluntarily?
Yes. You can deregister voluntarily if your taxable turnover falls below £88,000 (the deregistration threshold, which is slightly below the registration threshold to prevent constant registration and deregistration). To deregister, you submit form VAT7 to HMRC. On deregistration, you may need to account for VAT on assets held on which you previously claimed input VAT.
What is pre-registration VAT and how is it claimed?
Pre-registration VAT is input VAT incurred on goods and services before the VAT registration date. You can claim VAT on goods (purchased within 4 years before registration) if you still hold them at registration. You can claim VAT on services (received within 6 months before registration). These claims are made on your first VAT return.
Is the VAT Flat Rate Scheme available to voluntary registrants?
Yes. Once registered, you can apply to join the Flat Rate Scheme if your taxable turnover is under £150,000. However, as discussed elsewhere, most service businesses are now classified as limited cost traders under the FRS and pay 16.5% -- leaving very little benefit. Standard VAT accounting may be more appropriate.
What records do I need to keep as a VAT-registered business?
You must keep: VAT sales invoices (containing your VAT number, the customer's details, and the VAT amount), VAT purchase invoices for all costs on which you claim input VAT, a VAT account (record of all VAT charged and claimed), and records to support any adjustments or partial exemption calculations. Records must be kept for at least 6 years.
Try the calculators
In-depth guides
Related reading
Annual Investment Allowance (AIA) 2026/27: Full £1 Million Relief Explained
The AIA gives immediate 100% tax relief on up to £1 million of qualifying plant and machinery spending per year. Learn what qualifies, timing strategies, and writing-down allowances.
Cash Basis Accounting for Sole Traders and Landlords 2026/27
Cash basis accounting simplifies tax for small businesses by taxing income when received and deducting expenses when paid. Learn the rules, limits, and exit rules for 2026/27.
CIS for Subcontractors: Tax Deductions, Gross Status and Reclaims 2026/27
CIS subcontractors face 20% or 30% tax deductions from invoices. Learn how to apply for gross payment status, reclaim deductions, and avoid common CIS mistakes in 2026/27.