Knowing how to register a limited company for VAT is one of the more pressing admin tasks a director faces as the business grows. Get it right and you’re compliant, reclaiming input tax, and set up properly on Making Tax Digital. Get it wrong — miss the threshold, register late, or choose the wrong VAT scheme — and HMRC can issue back-dated liability plus a penalty on top.

The current VAT registration threshold in the UK stands at £90,000 of taxable turnover, measured on a rolling 12-month basis. Once your limited company crosses that figure, registration isn’t optional. The clock starts immediately, and the rules around deadlines are strict enough to catch businesses that weren’t actively monitoring their turnover.

This guide covers when you’re required to register, what documents and information you’ll need, how to complete the process through HMRC’s online portal, and what your obligations look like once registration is confirmed. It also covers voluntary registration — worth understanding even if your turnover is comfortably below the threshold.

The £90,000 threshold applies to your company’s taxable turnover — the total value of goods and services sold that are not VAT-exempt. Zero-rated supplies (such as most food, children’s clothing, and books) count towards the threshold even though they carry a 0% VAT rate. Exempt supplies (such as financial services or commercial rent, in some cases) do not count.

The two trigger points

There are two situations that require you to register:

• Historic test: if your taxable turnover in the previous 12 months has exceeded £90,000, you must register. You have 30 days from the end of the month in which you went over the threshold to notify HMRC. Your effective date of registration will be the first day of the second month after the month you breached the threshold.
• Future test: if you have reason to believe your taxable turnover will exceed £90,000 in the next 30 days alone, you must register immediately. Your effective date of registration in that case is the date you first realised it would happen — not the date you submitted the application.

What counts as taxable turnover?

For a typical limited company, taxable turnover is essentially your gross sales income from business activities subject to VAT. It doesn’t include VAT itself, exempt supplies, or income from selling capital assets (like a piece of equipment the company owned).

If your company trades in multiple areas — some standard-rated, some zero-rated — you need to be tracking all of them to know where you stand against the threshold. A bookkeeper or accountant keeping your records current makes this straightforward; doing it retrospectively is where businesses tend to get caught out.

If your taxable turnover is below £90,000, you don’t have to register — but you can choose to. Whether voluntary registration makes sense depends on who you’re selling to and how much VAT you’re incurring on your costs.

When voluntary registration works in your favour

• Your customers are VAT-registered businesses. If your clients can reclaim the VAT you charge them, adding 20% to your invoices doesn’t put them off — and you get to reclaim VAT on your own purchases. A software contractor billing other businesses, for instance, is typically in this position.
• You have significant VAT on purchases. If you’re buying equipment, materials, or services with VAT on them, registration lets you reclaim that input tax. For trades businesses buying tools and materials, this can add up quickly.
• You want to appear more established. Some directors register early for credibility reasons when bidding for corporate contracts.

When it works against you

• Your customers are end consumers (B2C). If your clients are private individuals who can’t reclaim VAT, charging 20% more makes you more expensive unless you absorb it by cutting your margin.
• Your administrative capacity is limited. VAT registration brings quarterly filing obligations, Making Tax Digital requirements, and the need for accurate record-keeping. For a very small business without a bookkeeper, that overhead is real.

There’s no universal answer here — it genuinely depends on your customer base, cost structure, and current turnover. If you’re unsure which way it falls for your company, it’s worth running the numbers with an accountant before deciding.

HMRC’s VAT registration is completed online through a Government Gateway account. Before you start, it’s worth gathering everything in one place — the application doesn’t save neatly mid-way, and returning to it later with missing information adds unnecessary friction.

Company information

• Your company registration number (from Companies House — the eight-digit number beginning with a number or two letters)
• The company’s registered address and principal place of business if different
• The nature of business — HMRC will ask for a description of what the company does and an SIC code where relevant

Financial details

• Your Unique Taxpayer Reference (UTR) for Corporation Tax — this is the 10-digit reference on your HMRC correspondence
• Your company’s bank account details (sort code and account number) — HMRC uses this for any VAT refunds it owes you
• Your current annual turnover figure or a close estimate
• An estimate of taxable turnover for the next 12 months

Tax registration history

HMRC will also ask about your company’s existing tax registrations — specifically whether you’re registered for Corporation Tax and whether the company operates a PAYE scheme for employees. This isn’t a hurdle; it’s just to link your VAT registration to your wider HMRC business tax account.

If your company has directors who also file Self Assessment returns, their UTRs aren’t typically required at this stage, though HMRC’s system may cross-reference them.

Having all of this ready before you start means the application itself takes 15 to 20 minutes rather than stopping and starting over a few days.

At the point of registration, HMRC will ask whether you want to join a VAT accounting scheme. The default is standard VAT accounting — you charge VAT on sales, reclaim VAT on purchases, and submit a return for each quarter showing the net position. That works perfectly well for most limited companies, but it’s worth knowing the alternatives before you commit.

Flat Rate Scheme

Instead of tracking VAT on every individual sale and purchase, you pay HMRC a fixed percentage of your gross turnover, set by your business sector. The rate varies — IT consultants pay a different flat rate to building contractors, for example. The appeal is simplicity: one calculation per quarter. The disadvantage is that you can’t reclaim VAT on most purchases individually (there’s an exception for single purchases of capital goods over £2,000). For limited companies with high margins and low input costs — consultants, for instance — the Flat Rate Scheme can produce meaningful savings. For those with significant material or equipment costs, standard accounting usually wins out.

Annual Accounting Scheme

You submit one VAT return per year rather than four. Payments are made in advance based on an estimate of what you’ll owe, with a balancing payment or refund at year-end. Good for businesses with predictable, steady income who find quarterly admin burdensome. Less suitable if your turnover fluctuates significantly, since underpaying on advances creates a large year-end catch-up.

Cash Accounting Scheme

Under standard accounting, VAT is due when you invoice a client — not when they pay. Cash accounting changes that: VAT is only accounted for when money actually moves. For companies with slow-paying customers, this can significantly improve cash flow. It also means you only reclaim VAT on purchases when you’ve actually paid your supplier.

The right scheme depends on your business model. If you’re unsure, standard accounting is a sensible default — you can switch later with HMRC’s agreement.

Once HMRC processes your application — typically within a few working days for online applications, though it can take up to 30 days in some cases — you’ll receive your VAT registration certificate. This contains your 9-digit VAT registration number, your effective date of registration, and your filing dates.

Your VAT number and invoices

From your effective date of registration, your limited company must include its VAT number on all VAT invoices issued to customers. A valid VAT invoice also needs to show the rate and amount of VAT charged separately from the net amount. If you invoice clients without including VAT from your effective date, you’ll still owe the VAT to HMRC — you’re just not collecting it from your customer, which means it comes out of your own revenue.

Making Tax Digital for VAT

HMRC automatically enrols new VAT registrations into Making Tax Digital (MTD) for VAT unless you’ve applied for an exemption. This means your VAT records must be kept in software that’s compatible with HMRC’s MTD API — Xero, QuickBooks, and Sage all qualify — and your returns must be submitted directly from that software rather than manually entered on the HMRC portal. If you’re not already using cloud accounting software, VAT registration is a natural point to set it up properly.

Reclaiming VAT on pre-registration purchases

There’s a useful provision many directors miss: you can reclaim VAT on goods purchased for business use up to four years before registration, and on services purchased up to six months before registration, provided those items haven’t been sold or consumed in making exempt supplies. So if your company bought equipment before registering, that input VAT isn’t necessarily lost.

The registration process is handled entirely online through HMRC’s Government Gateway. Here’s the sequence from start to finish.

These are the issues that come up repeatedly when limited companies go through the VAT registration process.