How to register for VAT as a limited company
If your limited company is approaching or has crossed the £90,000 VAT threshold — or you’re considering registering voluntarily — this guide walks you through exactly what you need to do and when. Written for UK limited company directors, it covers the rules, the process, the timing, and the mistakes worth avoiding. Roughly a 10-minute read.
What you need to know
- Your limited company must register for VAT once taxable turnover exceeds £90,000 in any rolling 12-month period.
- You have 30 days from the end of the month in which you crossed the threshold to register with HMRC.
- Voluntary registration is available below £90,000 and can be financially beneficial if your clients are VAT-registered businesses.
- Late registration means HMRC can require you to pay VAT back to the date you should have registered, plus potential penalties.
- VAT registration is done online via HMRC’s Government Gateway and typically takes two to four weeks to process.
Why VAT registration matters for limited companies
For many limited company directors, VAT registration is one of those things that creeps up on you. Turnover grows steadily, you’re focused on the work, and then somebody mentions the £90,000 threshold and suddenly it needs attention — fast. Knowing how to register for VAT as a limited company, and when you’re legally required to do so, is fundamental compliance knowledge that every director should have.
VAT — Value Added Tax — is a consumption tax collected by businesses on behalf of HMRC. Once you’re registered, you charge VAT on your taxable sales, reclaim VAT on eligible business purchases, and submit regular VAT returns. For a limited company, this creates both an administrative responsibility and, depending on your circumstances, a genuine financial planning opportunity.
This guide covers the registration threshold in detail, explains when mandatory registration kicks in, explores when voluntary registration makes sense, and walks you through the actual online registration process step by step. It also flags the gotchas that catch out directors who try to handle it without understanding the rules fully.
The VAT registration threshold for limited companies
The mandatory VAT registration threshold currently stands at £90,000 in taxable turnover. This isn’t an annual figure in the traditional sense — it’s assessed on a rolling 12-month basis, meaning you look back at the most recent 12 calendar months at any point in time, not just your company’s financial year.
What counts as taxable turnover?
Taxable turnover includes all sales of goods and services that are subject to VAT — at the standard rate (20%), reduced rate (5%), or zero rate (0%). It does not include exempt supplies (such as certain financial services or insurance), nor does it include the VAT itself that you charge.
For most limited companies delivering professional services, IT contracting, construction, or product sales, the vast majority of income will be taxable. But if your business operates in a sector with exempt income streams, you’ll need to be careful about what counts towards the threshold calculation.
The forward-looking trigger
There is a second, less obvious trigger. If at any point you have reasonable grounds to expect that your taxable turnover will exceed £90,000 within the next 30 days alone — for example, you’ve just signed a large contract — you must register immediately, before the 30 days are up. This is separate from the historic rolling test and catches directors off guard when they land a significant new client.
Both triggers apply to your company’s cumulative taxable income, not individual invoices, so it’s worth monitoring your rolling turnover monthly as you approach the threshold rather than waiting for year-end to assess it.
Mandatory registration: timing and effective dates
Getting the timing right matters, because HMRC is strict about registration deadlines — and the consequences of missing them are financial.
The historic test: when the deadline falls
If your rolling 12-month taxable turnover has exceeded £90,000, you must register within 30 days of the end of the month in which you crossed the threshold. Your effective date of registration — the date from which you must charge VAT — will be the first day of the second month after you exceeded the threshold.
To illustrate: if your rolling turnover tips over £90,000 during May 2026, you have until 30 June 2026 to register. Your effective date of registration will be 1 July 2026, which is the date from which you must charge VAT to your customers.
The future test: a tighter deadline
If you know today that your turnover will exceed £90,000 within the next 30 days, you must register by the end of that 30-day period. Critically, your effective date becomes the day you first realised you’d exceed the threshold — not a month later. This means you could be required to charge VAT almost immediately, so acting quickly is essential.
Why this matters in practice
The gap between your effective date and the date you actually get your VAT number can cause complications. You are liable for VAT from the effective date even if you don’t yet have a number. Some businesses raise invoices without VAT during this window, intending to reclaim it from customers once the number arrives. Whether your clients will pay the VAT retrospectively is a commercial consideration you’ll want to address upfront.
Voluntary VAT registration: is it worth it?
If your turnover is below £90,000, you can still apply to register for VAT voluntarily. Whether it makes sense depends on who your customers are and what your cost base looks like.
When voluntary registration makes financial sense
The main benefit of voluntary registration is the ability to reclaim VAT on your business purchases. If your limited company spends significantly on VAT-bearing costs — equipment, software, professional services, materials — you’ll be paying 20% more than necessary on those purchases while unregistered.
Voluntary registration also makes commercial sense if the majority of your clients are VAT-registered businesses. They can reclaim the VAT you charge them, so your prices are effectively the same to them whether or not VAT is added. Registering voluntarily can make your company look more established and may open doors to larger corporate clients who expect suppliers to be VAT-registered.
When voluntary registration works against you
If your clients are primarily consumers — members of the public, sole traders not registered for VAT, or small businesses — then registering voluntarily means your prices will appear 20% higher unless you absorb the VAT yourself and reduce your margin. For B2C businesses operating below the threshold, voluntary registration can be a competitive disadvantage.
A quick decision framework
- Mostly B2B clients who are VAT-registered? Voluntary registration is usually beneficial.
- High VAT-bearing costs? Worth registering to reclaim input tax.
- Mostly B2C or VAT-exempt clients? Weigh carefully — the admin overhead may outweigh the benefit.
- Planning to grow past £90,000 soon anyway? Getting registered early smooths the transition.
What you need before you apply
Before you start the online VAT registration application, gather everything you need. Having it ready upfront means the process is straightforward and reduces the risk of your application stalling partway through.
Your company details
- Company registration number (from Companies House)
- Registered office address
- Business trading address, if different
- Nature of your business activities and the relevant SIC codes
- The date you need your VAT registration to be effective from
Financial information
- An estimate of your expected taxable turnover in the next 12 months
- The value of taxable supplies in the last 12 months (if registering due to exceeding the threshold)
- Bank account details for repayments, if applicable
Government Gateway access
Your limited company needs a Government Gateway account with a business credential, not a personal one. Many directors set one up when they first registered the company or started submitting Corporation Tax returns. If you don’t yet have one, you’ll need to create it at HMRC’s online services portal before you can access the VAT registration service.
Thinking about VAT scheme
During the application, you’ll be asked whether you want to join a VAT accounting scheme. The main options are the standard quarterly VAT return, the Flat Rate Scheme (which can simplify accounting for smaller companies), and the Annual Accounting Scheme. It’s worth giving this some thought before you start, as the choice has a real impact on your cash flow and administrative workload.
After registration: what changes for your limited company
Getting your VAT registration number is just the beginning. Once you’re registered, several things change in how you run your company’s finances day to day.
Charging and accounting for VAT
From your effective date of registration, you must charge VAT on all taxable sales and issue VAT invoices. A valid VAT invoice must include your VAT registration number, the invoice date, a description of the goods or services, and the VAT amount charged separately. Customers who are VAT-registered can use this to reclaim the VAT, so getting it right matters to them as much as it does to you.
Submitting VAT returns under Making Tax Digital
For most VAT-registered businesses, returns must be submitted using Making Tax Digital (MTD) for VAT-compatible software. You cannot simply log into your Government Gateway and type in figures manually — you need software that links directly to HMRC. Xero, which DG Accountancy uses with all clients, is fully MTD-compliant and automates much of the record-keeping needed to produce accurate returns.
VAT returns are typically submitted quarterly, with payment due one month and seven days after the end of each VAT period.
Reclaiming VAT on purchases
Once registered, you can reclaim the VAT you’ve paid on legitimate business expenses — from software subscriptions and equipment to professional fees. Keep receipts and valid VAT invoices for everything you intend to reclaim. HMRC can ask to see these during an inspection.
Maintaining VAT records
HMRC requires you to keep VAT records for at least six years. Under MTD, this means keeping digital records that your accounting software can read and report from. Staying on top of this from day one is far easier than trying to reconstruct records when a return is due.
VAT schemes worth knowing about
Standard quarterly VAT accounting is the default, but it isn’t always the best fit for every limited company. Understanding the available schemes helps you make an informed decision at registration — and it’s worth revisiting periodically as your business grows.
Flat Rate Scheme
Designed to reduce the administrative burden for smaller businesses, the Flat Rate Scheme lets you pay a fixed percentage of your gross turnover to HMRC rather than calculating the difference between output and input VAT on every transaction. The flat rate varies by sector — IT contractors, for example, use a different rate to a restaurant. You still charge customers the full 20% VAT but pay HMRC a lower percentage, which can mean a modest financial benefit in some sectors. The scheme is available to businesses with taxable turnover below £150,000 at registration, though a 1% discount applies in your first year.
Cash Accounting Scheme
Under standard VAT accounting, VAT is due based on invoice dates regardless of when payment arrives. The Cash Accounting Scheme switches this so that VAT becomes due only when you actually receive payment. For businesses that invoice ahead and sometimes wait 30–60 days for payment, this can significantly improve cash flow.
Annual Accounting Scheme
Rather than submitting four VAT returns per year, the Annual Accounting Scheme reduces this to one. You make advance payments during the year based on your previous year’s VAT liability, then submit a single annual return to settle the difference. This reduces paperwork but means less frequent reconciliation, which suits some directors and creates complexity for others.
None of these schemes is automatically right for your business. If you’re unsure which suits your trading pattern, it’s worth getting advice before you submit your registration — you can also switch schemes later, but there are rules about when and how.
How to register for VAT online: step by step
The VAT registration process for a limited company is handled entirely online through HMRC’s Government Gateway. Here’s what to expect from start to finish.
Check your position against the threshold
Before you do anything, confirm whether you’re registering because you’ve exceeded the £90,000 threshold (mandatory) or because you want to register voluntarily. Calculate your rolling 12-month taxable turnover and identify the correct effective date. This determines which registration route you take and what date HMRC will assign.
Log in to Government Gateway
Sign into your company’s Government Gateway account at gov.uk. If you don’t yet have a business account, create one — this takes a few minutes but requires your company registration number and HMRC reference details. Don’t use a personal Government Gateway login; your VAT registration must sit under the company’s credentials.
Access the VAT registration service
Once logged in, navigate to the ‘Register for VAT’ service. HMRC’s online portal guides you through a series of questions about your business, your taxable supplies, and your expected turnover. Take care when entering your effective date of registration — this is not the date you’re applying, but the date from which you should have been charging VAT.
Choose your VAT accounting scheme
You’ll be asked whether you want to join the Flat Rate Scheme, Cash Accounting Scheme, or Annual Accounting Scheme. If you’re unsure, you can register on standard quarterly accounting and switch later. The choice affects your cash flow and how you maintain records, so don’t rush this section without thinking it through.
Submit and wait for your VAT number
Once submitted, HMRC typically processes registrations within two to four weeks, though it can take longer during busy periods. You’ll receive a VAT Registration Certificate (VAT 4) confirming your VAT number and effective date. Keep this document safely — you’ll need the number for invoices and VAT returns.
Set up your accounting software for MTD
Before your first return is due, make sure your accounting software is MTD-compliant and linked to your HMRC account. In Xero, this is a straightforward setup process. From your effective date, you need to keep digital VAT records — so don’t leave this step until the night before your first return is due.
Common mistakes to avoid
These are the errors that most often trip up limited company directors during and after the VAT registration process.
Missing the 30-day registration deadline
The clock starts from the end of the month you crossed the threshold, not the date you realised. Many directors spot the issue weeks later, by which time the deadline has already passed. HMRC can and does issue penalties for late registration, and you’ll still owe the VAT you should have charged from the correct effective date — which may require you to chase customers for it retrospectively.
Using a rolling 12-month total incorrectly
The threshold applies to any rolling 12-month window, not your financial year. A director who turns over £85,000 in their financial year might still have a period where the rolling total exceeds £90,000. If you only check at year-end, you may have already been over the threshold for months without realising it.
Getting the effective date wrong on the application
HMRC will set your effective date based on what you tell them in the application. If you enter the wrong date, you may end up registered from a date later than required, leaving you exposed to back-VAT liability for the intervening period. Double-check the calculation before you submit, particularly if you’re applying after the deadline has already passed.
Not considering the VAT scheme carefully
Defaulting to standard quarterly accounting without considering alternatives can cost you money. A software consultant registering on standard rates might be better off on the Flat Rate Scheme; a business with slow-paying clients might benefit from cash accounting. It takes five minutes to think it through and potentially saves real money — especially in the first year when the 1% Flat Rate discount applies.
When professional help pays off
Registering for VAT online is a process most limited company directors can manage themselves, particularly when turnover is straightforward and registration is voluntary or only just triggered. HMRC’s portal is reasonably clear if you go in prepared.
That said, there are situations where having an accountant handle it — or at least review your position before you apply — is genuinely worth the cost:
- You’ve already missed the registration deadline. Late registration needs to be handled carefully, including calculating the back-VAT owed and understanding your penalty exposure. Getting this wrong can compound the problem.
- Your turnover includes a mix of taxable, zero-rated, and exempt supplies. Partial exemption rules are complex, and getting them wrong affects how much VAT you can reclaim.
- You’re unsure which VAT scheme suits your business. The Flat Rate Scheme in particular requires accurate sector classification — a wrong rate costs real money.
- You’re registering as part of a wider restructuring, property transaction, or group arrangement. Group VAT registration and VAT on property transactions have significant quirks that require specialist input.
At DG Accountancy, VAT registration and ongoing VAT returns are included in our limited company packages from the Operate tier upwards.
Related guides and services
More detail on VAT registration and related topics for UK limited companies and contractors.
Frequently asked questions
When does a limited company have to register for VAT?
A limited company must register for VAT when its taxable turnover in any rolling 12-month period exceeds £90,000, or when it expects to exceed £90,000 in the next 30 days alone. You have 30 days from the end of the threshold-crossing month to register, and your effective date will be the first day of the following month.
Can a limited company register for VAT voluntarily?
Yes. Any limited company can apply to register for VAT voluntarily even if turnover is below £90,000. This is often beneficial if your clients are themselves VAT-registered (as they can reclaim the VAT you charge) or if you incur significant VAT on business purchases that you’d like to reclaim.
How long does VAT registration take for a limited company?
HMRC typically processes VAT registration applications within two to four weeks, though during busy periods it can take longer. You’ll receive a VAT Registration Certificate confirming your VAT number and effective date. You are liable for VAT from your effective date even if you’re still waiting for the number to arrive.
What happens if my limited company registers for VAT late?
Late registration means HMRC can require you to pay the VAT you should have charged from the correct effective date — regardless of whether you actually collected it from customers. HMRC may also issue a late registration penalty. The amount depends on how late you are and the unpaid VAT involved, so it’s worth acting quickly if you think you’ve missed the deadline.
Does a limited company need special software to file VAT returns?
Yes. Under Making Tax Digital for VAT, all VAT-registered businesses must keep digital records and submit returns using MTD-compatible software. You cannot submit VAT returns manually through your Government Gateway account. Accounting platforms such as Xero are MTD-compliant and can link directly to HMRC to submit returns from within the software.
Can I reclaim VAT on costs before my limited company registered?
Yes, in many cases. HMRC allows limited companies to reclaim VAT on goods purchased up to four years before registration, provided those goods are still on hand and used for the business. For services, the reclaim window is six months prior to registration. You claim these pre-registration costs on your first VAT return, but the rules have conditions, so it’s worth confirming your eligibility.
Final thoughts
Knowing how to register for VAT as a limited company — and getting the timing right — is one of those compliance fundamentals that’s straightforward when handled correctly and costly when it isn’t. The rules around the rolling threshold, the two-trigger system, and the effective date calculation catch out a surprising number of directors every year, largely because they’re not quite as intuitive as they first appear.
If you’re approaching the £90,000 threshold, check your rolling 12-month figure now rather than waiting until you’ve clearly crossed it. And if you’re already over — or you’re not sure — it’s worth getting your position confirmed before you apply, so you’re registering on the right date and with the right scheme from day one.
Whether you’re handling the application yourself or want someone to manage it for you, DG Accountancy can help. VAT registration and ongoing returns are part of our standard limited company service, and we’re always happy to talk through your situation first with no obligation.