VAT Registration for Sole Traders: The £90,000 Threshold

When sole traders must register for VAT

VAT registration is a separate system from Self Assessment, but it catches many sole traders by surprise. There are two tests, and both use taxable turnover — your sales of VAT-able goods and services, not your profit. HMRC sets out both tests in its guidance on when to register for VAT.

1. The backwards-looking test. At the end of every month, add up your taxable turnover for the previous 12 months. If it exceeds £90,000, you must register within 30 days of the end of that month.
2. The forward-looking test. If you expect your taxable turnover to exceed £90,000 in the next 30 days alone — for example, you have just signed a large contract — you must register straight away.

Your effective date of registration is the date you cross the threshold, and HMRC can require you to account for VAT from that date even if you registered late. Late registration can leave you owing VAT that you never charged your customers.

What counts towards the £90,000

Taxable turnover includes sales at the standard, reduced and zero rates, but excludes exempt supplies such as most insurance, finance and health services. Crucially, it is turnover, not profit — expenses do not reduce it. A high-volume, low-margin business, such as a reseller or a dropshipper, can cross the threshold while making only modest profit, so check your rolling 12-month total at the end of every month.

Should you register voluntarily?

You can register before reaching the threshold. This often makes sense if most of your customers are VAT-registered businesses: you reclaim the VAT on your own costs, and your customers reclaim the VAT you charge them, so the VAT is not a cost to either of you. It usually makes less sense if you sell mainly to consumers, because charging 20% VAT either raises your prices or comes out of your income. Voluntary registration also brings quarterly returns and digital record-keeping, so weigh the reclaim against the administration before deciding.

Worked example: what registration does to the numbers

The example below is for a sole trader who is VAT-registered and charges the standard 20% rate on everything.

The £15,000 belongs to HMRC, not to you — never treat it as profit or working cash. For income tax purposes, a VAT-registered business normally reports sales and expenses excluding VAT, so the Self Assessment profit here is £95,000 − £20,000 = £75,000 before any other costs. Now consider a trader who sells to consumers and cannot raise prices: if £95,000 of takings already includes VAT, the VAT is £95,000 ÷ 6 = £15,833.33 and net sales are only £79,166.67. That is a loss of income of roughly £15,833 a year, which is why pricing needs careful thought before the threshold is reached.

Choosing a VAT scheme

Standard accounting is the default: you charge VAT, reclaim VAT on purchases, and pay HMRC the difference. Once registered, sole traders can choose from schemes that simplify things:

• The Flat Rate Scheme. You pay a fixed percentage of your VAT-inclusive turnover to HMRC instead of tracking input and output VAT on every transaction. The percentage depends on your trade, so it suits businesses with few VAT-able purchases. Check HMRC’s guidance on the VAT Flat Rate Scheme for the current eligibility limits and percentages.
• Cash accounting. You account for VAT when you are paid and when you pay suppliers, rather than on invoice dates. This helps cash flow if customers pay slowly.
• Annual Accounting. You file one VAT return a year and make interim payments, which suits businesses that prefer less frequent reporting.

Compare the schemes on your own numbers before committing: the flat rate is simpler but can cost more if your VAT-able purchases are high. Review the decision each year as your business changes.

Making Tax Digital for VAT

Most VAT-registered businesses must keep digital records and file VAT returns using compatible software — paper returns are no longer accepted. Returns are usually quarterly and are due one month and seven days after the end of the VAT quarter. Choose MTD-compatible software before you register, not after, so your first return runs smoothly.

Common mistakes sole traders make

• Measuring turnover by tax year instead of the rolling 12-month test.
• Treating VAT collected as available cash, and spending it.
• Registering late and owing VAT that was never charged to customers.
• Choosing the Flat Rate Scheme without comparing it to standard accounting.
• Not keeping VAT invoices for costs, which means input VAT cannot be reclaimed.
• Mixing up VAT turnover with Self Assessment profit. See how to calculate your self-employed profit.

Practical checklist

1. Add up taxable sales for the last 12 months at the end of every month.
2. Set an internal alert at around 80% of the threshold — about £72,000.
3. Decide whether voluntary registration helps, based on your customer mix.
4. Choose software that works with Making Tax Digital for VAT.
5. Review pricing before registering, so VAT is added deliberately rather than absorbed.
6. Read our first-year self-employed guide if you are new to all of this.

How SATR can help

Our qualified UK accountants make sure your Self Assessment return correctly treats VAT, filed online from a fixed fee from £199 + VAT. See our Self Assessment service for sole traders.

This is general information, not personal tax advice. Check current HMRC guidance for the VAT threshold and rules.

Frequently asked questions

For more answers on deadlines, penalties and filing, browse our Self Assessment FAQs.

Does VAT registration affect my Self Assessment?

Your income and expenses are reported excluding VAT in most cases, so it affects how you record transactions.

Do I have to charge VAT as soon as I register?

Yes. From your effective date of registration you charge VAT on taxable supplies. If you are late registering, HMRC may expect you to account for VAT from the date you should have registered.

Can I deregister if my turnover falls again?

Yes. If your taxable turnover falls below the deregistration threshold you can cancel your VAT registration, subject to any VAT due on stock and assets you still hold.

Does being VAT-registered change my Self Assessment return?

It changes how turnover and expenses are reported, because VAT-registered businesses normally report figures excluding VAT. You still file the Self Assessment return separately.

How often do I file VAT returns?

Usually every quarter. Returns are due one month and seven days after the end of your VAT quarter, using MTD-compatible software.

The Bottom Line

VAT registration is compulsory once your taxable turnover passes £90,000 in any rolling 12 months — not the tax year — so check your running total at the end of every month. Below the threshold, register voluntarily only if reclaiming VAT on your costs outweighs the quarterly returns and digital record-keeping. Either way, price deliberately: VAT absorbed into consumer prices comes straight out of your income.

Not sure whether to register, or which scheme suits you? Our qualified UK accountants will review your numbers and file your Self Assessment for a fixed fee from £199 + VAT — order online now and leave the rest to us.