The £90,000 threshold, voluntary registration, and what Making Tax Digital means for your startup. VAT explained simply for UK founders.
VAT is one of those topics founders avoid until they can’t. The rules sound complicated, the threshold keeps coming up in conversation, and nobody wants to accidentally owe HMRC thousands. The good news: the core of it is simpler than it looks. Here’s what you actually need to know.
What VAT is, in one paragraph
VAT (Value Added Tax) is a tax on most goods and services in the UK, currently charged at a standard rate of 20%. If you’re VAT-registered, you add VAT to your prices, collect it from customers, and pass it to HMRC (minus the VAT you’ve paid on your own business purchases). You become, in effect, an unpaid tax collector. In return, you can reclaim VAT on your costs.
The £90,000 question
You must register for VAT when your VAT-taxable turnover exceeds £90,000 in any rolling 12-month period, not your financial year but any 12 consecutive months. You also must register if you expect to cross £90,000 in the next 30 days alone.
Two things trip founders up:
- It’s a rolling window. You can’t just check at year end. A strong few months can push you over, and you need to be watching.
- It’s turnover, not profit. The threshold is based on sales, regardless of whether you’re making money.
Once you’re required to register, you have 30 days to do it. Miss that and HMRC can backdate your registration and bill you for VAT you never charged your customers, which comes straight out of your margin. Monitoring turnover so this never happens is a basic part of keeping your books current.
Should you register voluntarily, before you have to?
You’re allowed to register before you hit £90,000, and sometimes it’s a smart move. It comes down to who your customers are.
Voluntary registration often makes sense if:
- You sell mainly to other VAT-registered businesses. They reclaim the VAT you charge, so your prices don’t really go up for them, and you get to reclaim VAT on your own costs.
- You’re spending heavily on startup costs (equipment, software, professional fees). Registering lets you reclaim the VAT on all of that.
- You want to look established. Some clients read a VAT number as a sign you’re a serious operation.
It usually doesn’t make sense if:
- You sell mostly to consumers or non-VAT-registered customers. Adding 20% either makes you less competitive or eats your margin.
- Your costs are low, so there’s little VAT to reclaim, and you’d just be taking on admin.
There’s no universal answer. It depends on your model. We model both scenarios for founders so the decision is based on your actual numbers, not a rule of thumb.
Which VAT scheme is right for you?
If you register, you’ll also choose how you account for VAT:
- Standard (accrual) accounting: you account for VAT based on invoice dates. The default, and the most flexible.
- Cash accounting: you account for VAT only when money actually changes hands. Helpful for cashflow if customers pay slowly.
- Flat Rate Scheme: you pay a fixed percentage of turnover instead of tracking VAT on every transaction. Simpler admin, and occasionally cheaper, but rarely the best choice if you have significant VATable costs.
Picking the wrong scheme can quietly cost you money every quarter, so it’s worth getting right at registration rather than discovering the issue a year in.
Making Tax Digital: the part that’s actually easy
Making Tax Digital (MTD) for VAT requires VAT-registered businesses to keep digital records and file returns through compatible software, not by typing numbers into HMRC’s website. This sounds like a burden but is genuinely the easy part: if your bookkeeping runs in software like Xero, you’re MTD-compliant automatically. The return is built from your live data and filed in a few clicks.
This is one of the quiet advantages of running your books properly in the cloud from the start: compliance becomes a by-product rather than a project.
A quick worked example
Say you run a B2B design studio. In a strong rolling 12 months your sales hit £96,000, which is over the threshold, so you must register. You charge clients 20% VAT, which they (being VAT-registered businesses) reclaim, so it costs them nothing. Meanwhile you reclaim VAT on your software subscriptions, your laptop, and your accountant’s fees. Registration is broadly neutral for your clients and slightly positive for you.
Now say you sell £96,000 of products directly to consumers. The same registration means either raising prices 20% (hurting demand) or absorbing it (cutting your margin). Same threshold, very different impact. This is exactly why the who-are-your-customers question matters more than the number itself.
The bottom line
VAT registration is mandatory above £90,000 of rolling turnover, optional below it, and genuinely worth thinking about before you’re forced to. Get the timing right, choose the correct scheme, and let your software handle MTD, and VAT becomes routine rather than frightening.
If you’re not sure where your startup stands, or whether voluntary registration would help, book a free 30-minute call. We’ll look at your actual numbers and give you a clear answer.