VAT Registration for Trades: When and How

VAT registration becomes mandatory for a UK trade business when its taxable turnover exceeds £90,000 in a rolling 12-month period. This threshold has been fixed at £90,000 since April 2024.

The rolling 12-month calculation is important: it's not a calendar year or tax year figure. HMRC looks at any 12-month period ending on any day. If your turnover in the 12 months to the end of any given month exceeds £90,000, you must register within 30 days of the end of that month and start charging VAT from the first day of the following month.

For a trade business, taxable turnover means the total value of work you bill to customers that is not VAT-exempt. Almost all trade work (electrical installations, plumbing, gas work, building work) is standard-rated at 20%. So your taxable turnover is essentially your total revenue.

Missing the registration deadline is a common mistake. HMRC can charge a penalty based on the VAT you should have collected from the date you should have registered. This can add up quickly on a few months of invoices at 20%.

You can register for VAT voluntarily at any point, even before you reach the £90,000 threshold. For some trade businesses, this makes good commercial sense.

When voluntary registration helps

• If most of your customers are VAT-registered businesses (commercial clients, property developers, landlords with portfolios). They will reclaim the VAT you charge, so your prices are effectively the same to them net of VAT. You benefit from reclaiming VAT on your own purchases.
• If you're spending significantly on plant, equipment, vans, or materials. Reclaiming the VAT on those purchases can generate a meaningful cash benefit.
• If you want to appear more established: some commercial clients associate VAT registration with a more professional, scale-ready business.

When voluntary registration hurts

• If most of your customers are domestic homeowners: they cannot reclaim VAT, so charging 20% VAT on top of your prices makes you 20% more expensive than an unregistered competitor. In a competitive domestic market this can cost you work.
• The admin burden increases. You must submit VAT returns (usually quarterly) and keep VAT-compliant records.

The right answer depends on your customer mix. A commercial electrician working predominantly for property developers will find voluntary registration beneficial well before the threshold. A domestic plumber or gas engineer serving homeowners should think carefully before registering early.

Once registered, you must add VAT at the current standard rate (20%) to all your taxable invoices. You then pay the VAT you've collected to HMRC, but you can deduct the VAT you've paid on your own business purchases.

The key concepts:

• Output VAT: The VAT you charge on your invoices. This belongs to HMRC and must be paid across.
• Input VAT: The VAT you've paid on purchases (materials, tools, van, fuel, subcontractors), you reclaim this from HMRC.
• VAT due: Output VAT minus input VAT. If you collect more than you pay, you pay the difference to HMRC. If you pay more than you collect (common when you buy a lot of materials), HMRC repays you.

A simple example:

You invoice £10,000 of work in a quarter and buy £3,000 of materials. Output VAT = £2,000 (20% of £10,000). Input VAT = £600 (20% of £3,000). You pay HMRC £1,400 for that quarter.

What changes on your invoices:

Once registered, your invoices must show your VAT number, the VAT amount separately, and the VAT-inclusive total. A quote that was £1,500 before registration becomes £1,500 + £300 VAT = £1,800 to domestic customers. To VAT-registered business customers, the net cost is still £1,500: they reclaim the £300.

The Flat Rate Scheme (FRS) is an alternative way of calculating VAT that some trade businesses find advantageous: particularly in the first year of registration.

How it works:

Instead of tracking input and output VAT on every transaction, you pay HMRC a fixed percentage of your VAT-inclusive turnover. The rate depends on your trade category. You still charge customers VAT at 20%, but you pay HMRC a lower percentage and keep the difference.

For example, if a trade business falls into a category with a 12% flat rate:

• You invoice £10,000 + £2,000 VAT = £12,000 from a customer.
• You pay HMRC 12% of £12,000 = £1,440.
• You keep £2,000 − £1,440 = £560.

Important caveat. The "limited cost trader" rule:

HMRC introduced a 16.5% flat rate for "limited cost traders". Businesses whose VAT-inclusive spend on goods is less than 2% of turnover or less than £1,000 per year. Many service-heavy tradespeople (particularly those who don't buy large quantities of materials on each job) fall into this category. At 16.5%, the FRS often provides no financial benefit compared to standard accounting. Run the numbers before assuming the FRS will save you money.

FRS is simpler but not always cheaper:

You cannot reclaim input VAT on most purchases under the FRS (only on single capital items costing more than £2,000). For trade businesses making significant material purchases, standard VAT accounting usually wins. The FRS suits tradespeople whose business is primarily labour with minimal material costs.

Your accountant or a VAT-specialist advisor can calculate whether FRS or standard accounting is better for your specific situation before you register.

Making Tax Digital (MTD) for VAT has been mandatory for all VAT-registered businesses since April 2022. This means:

• You must keep digital VAT records: paper-based bookkeeping no longer satisfies HMRC's requirements.
• You must submit VAT returns directly from compatible software: you cannot manually type figures into the HMRC portal.

Compatible software includes Xero, QuickBooks, Sage, FreeAgent, and a range of other accounting packages. Many trade job management platforms also integrate directly with accounting software, creating an end-to-end digital chain from invoice to VAT return.

Getting the invoice out and paid promptly matters more once you are registered, because the VAT you have charged is due to HMRC each quarter whether or not the customer has paid you yet. That chasing is exactly what an office team handles without a hire: Tradehand is the office staff big firms have, without hiring anyone, sending every invoice the moment a job is done and chasing it until it is paid, so the cash is in before the VAT falls due. There is no monthly fee; it earns 5% of the invoices it chases and collects, so if it does not collect, you do not pay. If you would rather run that chasing yourself, our guide to chasing unpaid invoices covers the manual version.

If you're registering for VAT now, you need to have a compatible MTD-ready system in place before your first VAT return. Setting up accounting software as part of registration, rather than scrambling before your first return, avoids penalties for non-compliant submissions.

Practical implications:

• Every sales invoice must be recorded digitally in software that links to HMRC.
• Every purchase receipt you want to reclaim VAT on must also be recorded digitally.
• VAT returns are usually submitted quarterly, with payment due one month and seven days after the end of the VAT quarter.

If you realise your turnover has already exceeded £90,000 in the past 12 months and you haven't registered, act immediately. Delays make the position worse.

Step 1: Calculate when you first exceeded the threshold

Look at your invoices month by month and identify the exact rolling 12-month period when you first crossed £90,000. This sets the date from which you should have been registered and charging VAT.

Step 2: Register now through GOV.UK

You can register for VAT online at gov.uk/register-for-vat. The registration process typically takes 3–5 weeks and HMRC will send you your VAT number and details of your VAT return periods.

Step 3: Understand the potential back-VAT position

HMRC may assess you for VAT you should have charged and collected from the date you should have registered. In practice, HMRC will expect you to account for the VAT on the invoices you issued during the period: even though you didn't collect it from customers. This is a genuine financial cost and another reason to avoid letting late registration drag on.

Step 4: Tell your accountant

Late registration has potential penalty implications. An accountant or tax adviser can help you make a voluntary disclosure to HMRC, which typically results in lower penalties than HMRC discovering the issue through investigation. Coming forward voluntarily is always better than being found out.