VAT Explained for Sole Traders
For most sole traders, VAT is something that happens to other, bigger businesses - right up until it isn't. Turnover creeps up, a few good months stack together, and suddenly you're over a threshold you weren't watching, owing VAT you never charged.
This guide explains how VAT works, exactly when you have to register, when it can make sense to register voluntarily, which schemes are worth knowing about (and which one to be wary of), and what happens if you file or pay late. It's part of our sole trader series of simple explainers and sits beneath our main Sole Trader Tax Guide.
📋 Table of Contents
💡 What VAT Actually Is
VAT isn't a tax on you - it's a tax on your customers that you collect on HMRC's behalf. Once registered, you add VAT to your prices, then pass it to HMRC every quarter after deducting the VAT you've paid on your own business costs.
That makes one thing very important: the VAT in your bank account was never your money. It belongs in a separate pot from day one. Our guide to how much tax to set aside covers how to keep it apart from your income tax savings.
📏 When You Must Register
You must register for VAT if your VAT-taxable turnover goes over £90,000 in any rolling 12-month period. You must also register straight away if you expect to go over £90,000 in the next 30 days alone - for example, if you've just won a single large contract.
Three details catch people out:
It's a rolling 12 months, not your tax year or accounting year. Check the running total at the end of every month by adding up the last 12.
It's turnover, not profit. A kitchen fitter turning over £95,000 with £60,000 of materials is over the threshold, even though their profit is only £35,000.
Zero-rated sales count; exempt sales don't. Zero-rated items (such as most food and children's clothes) are still taxable at 0% and are included. Exempt income (such as residential rent or some financial services) isn't.
If your turnover later drops, you can apply to deregister once it falls below £88,000.
📝 How Registration Works
Once you go over the threshold, you have 30 days from the end of that month to tell HMRC. Your registration then takes effect from the first day of the second month after you went over.
For example, if your rolling turnover passes £90,000 at the end of June, you must register by 30 July, and you're VAT-registered from 1 August.
From your effective date you must charge VAT on your sales, issue VAT invoices, keep digital records and file VAT returns through Making Tax Digital-compatible software. Getting your bookkeeping set up properly from day one makes all of this far less painful.
Register late, and you still owe the VAT. HMRC will backdate your registration to when it should have started. Any VAT you should have charged but didn't usually comes out of your own pocket, because you can't easily go back to customers for it.
🤔 Voluntary Registration: Worth It?
You can register for VAT below £90,000, and for some sole traders it makes good sense:
When it can help:
Your customers are VAT-registered businesses. They reclaim the VAT you charge, so it costs them nothing extra.
You have significant VAT on your costs - stock, equipment, materials - that you'd be able to reclaim.
You want to look established. Some larger clients prefer to work with VAT-registered suppliers.
When it usually doesn't:
Your customers are the public. They can't reclaim VAT, so you either raise your prices by 20% or absorb the cost from your margin.
Your costs carry little VAT, so there's little to reclaim against the extra admin.
It's worth running the numbers both ways before deciding - it's harder to undo than to do.
🔢 VAT Rates
Rate | Applies to | Examples |
Standard - 20% | Most goods and services | Most trades, consultancy, retail |
Reduced - 5% | Certain goods and services | Domestic energy, some energy-saving installations |
Zero - 0% | Taxable, but at 0% | Most food, books, children's clothing |
Exempt | Outside VAT entirely | Residential rent, some financial and health services |
The difference between zero-rated and exempt matters: you can reclaim VAT on costs relating to zero-rated sales, but generally not on costs relating to exempt ones.
🧾 How a VAT Return Works
Every quarter, the calculation is the same:
VAT you charged on sales (output VAT) - VAT you paid on business costs (input VAT) = VAT you pay HMRC
If you paid more VAT than you charged - common in a quarter with a big equipment purchase - HMRC refunds you the difference.
🧮 Worked Example: Sophie's Quarter
Sophie is a self-employed kitchen fitter, VAT-registered on the standard scheme. In one quarter:
She invoices £30,000 of work, adding 20% VAT: £6,000 of output VAT
She buys £12,000 of materials and tools, paying £2,400 of input VAT
Her VAT return shows £6,000 - £2,400 = £3,600 to pay HMRC.
None of that £3,600 is profit or cost to Sophie - it's her customers' money, passing through her account. Which is exactly why it needs to sit in a separate pot until the return is due.
If Sophie works on construction jobs for other VAT-registered contractors, different rules may apply under the domestic reverse charge, where the customer accounts for the VAT instead of her. We explain how that works in our guide to the VAT domestic reverse charge.
↩️ Reclaiming VAT From Before You Registered
You can usually reclaim VAT on purchases made before your registration date:
Goods bought in the four years before registration, as long as you still have them (or they've been used to make goods you still hold)
Services bought in the six months before registration
These go on your first VAT return. Keep the invoices - without a valid VAT invoice, the claim won't stand up.
🗂️ VAT Schemes for Small Businesses
Flat Rate Scheme:
Instead of calculating output minus input VAT, you pay HMRC a fixed percentage of your VAT-inclusive turnover, set by your trade sector. You can join if you expect VAT-taxable turnover of £150,000 or less (excluding VAT) over the next 12 months, and must leave once total VAT-inclusive turnover passes £230,000. There's a 1% discount in your first year of VAT registration.
The catch is the limited cost trader rule. If your spending on goods is less than 2% of your VAT-inclusive turnover, or less than £1,000 a year, you must use a flat rate of 16.5% whatever your sector. That catches most service businesses - consultants, designers, many freelancers - and at 16.5% the scheme usually costs more than standard VAT accounting. The test applies every quarter, not just when you join.
Cash Accounting Scheme:
You account for VAT when your customer actually pays you, not when you invoice. Useful if clients are slow payers, because you're never handing over VAT you haven't received. Available up to £1.35 million turnover.
Annual Accounting Scheme:
One VAT return a year, with advance payments through the year. Less admin, but harder to keep a close eye on. Also available up to £1.35 million.
🧮 Worked Example: Raj and the Flat Rate Trap
Raj is a freelance IT consultant. In one quarter he invoices £20,000 plus £4,000 VAT (£24,000 gross). His only purchases are software subscriptions carrying £200 of VAT, and he spends almost nothing on physical goods - so he's a limited cost trader.
Standard VAT: £4,000 - £200 = £3,800 to HMRC
Flat Rate Scheme at 16.5%: £24,000 x 16.5% = £3,960 to HMRC
The Flat Rate Scheme costs Raj £160 more every quarter - £640 a year - for the sake of simpler sums. Even in his first year, at 15.5%, he'd pay £3,720, an advantage of just £80 a quarter that disappears in year two.
The scheme still suits some sole traders with a low sector rate and real spending on goods. But it's worth checking the maths rather than assuming "simpler" means "cheaper".
⏰ Deadlines and Penalties
VAT returns and payments are due one month and seven days after the end of each VAT period. So a quarter ending 30 June is due by 7 August.
Late returns earn penalty points rather than an instant fine. Quarterly filers reach the threshold at 4 points, at which point a £200 penalty is charged - and another £200 for every late return after that, until you've been compliant for long enough to reset.
Late payments are penalised separately, and the rates rose in April 2025:
Up to 15 days late: no penalty
16 to 30 days late: 3% of the VAT outstanding at day 15
Over 30 days late: a further 3% of what's still outstanding at day 30, plus a daily penalty at 10% a year until it's paid
On top of that, late payment interest runs from the first day the payment is overdue, at 4% above the Bank of England base rate. If you can't pay in full, contacting HMRC about a Time to Pay arrangement before day 15 avoids the penalties.
⚠️ Common Mistakes to Avoid
Only checking turnover at year end. The threshold is a rolling 12 months - check it monthly.
Confusing turnover with profit. Businesses with high costs, such as trades buying materials, cross the line sooner than they expect.
Registering late. The VAT is still owed from the date you should have registered, usually out of your own pocket.
Spending the VAT. It's never your money - keep it in a separate account.
Joining the Flat Rate Scheme without checking the 16.5% rule. Most service businesses are limited cost traders.
Forgetting pre-registration VAT. Equipment bought in the last four years may be reclaimable on your first return.
Missing that late payment and late filing are separate. Filing on time doesn't protect you from payment penalties, and vice versa.
💬 Frequently Asked Questions
What is the VAT threshold for 2026/27? £90,000 of VAT-taxable turnover in any rolling 12-month period. The de-registration threshold is £88,000.
Does the threshold apply to my profit or my turnover? Turnover - everything you invoice that's VAT-taxable, before deducting any costs.
Can I register for VAT voluntarily? Yes. It often makes sense if your customers are VAT-registered businesses or you have significant VAT on your costs, but rarely if you sell mainly to the public.
Do I have to use Making Tax Digital for VAT? Yes. All VAT-registered businesses must keep digital records and file VAT returns through MTD-compatible software.
What happens if I realise I should have registered months ago? Register immediately and take advice. HMRC will backdate your registration, and the sooner you act, the lower the penalties and interest are likely to be.
Is the Flat Rate Scheme a good idea? Sometimes. It can save money for businesses with a low sector rate and genuine spending on goods, but most service businesses fall under the 16.5% limited cost trader rate, where it usually costs more.
💡 Key Takeaways
You must register once VAT-taxable turnover passes £90,000 in any rolling 12 months, or if you expect to pass it in the next 30 days alone.
Notify HMRC within 30 days of the end of the month you went over - late registration means paying the VAT yourself.
Voluntary registration suits businesses selling to VAT-registered customers or with high VAT on costs.
VAT due = output VAT - input VAT, filed quarterly through MTD software.
The Flat Rate Scheme can backfire: most service businesses fall under the 16.5% limited cost trader rate.
Returns and payments are due one month and seven days after each quarter; late payment penalties start at 3% from day 16.
📞 Approaching the VAT Threshold? Talk to Us First
At ASBA Accounting, we help sole traders across Crawley and West Sussex work out when to register, whether voluntary registration or a VAT scheme would save them money, and then take the quarterly returns off their hands entirely through our VAT returns service.
👉 Get in touch today or call us on 01293 525656 for friendly, straightforward advice.
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