VAT Scheme Guide for Builders: Which One Fits?

A VAT return can look straightforward until a job runs over, a contractor holds back payment, materials arrive on a separate invoice, and the domestic reverse charge appears on top. This VAT scheme guide for builders explains the main options in plain English, so you can choose a method that suits how your construction business actually earns and spends money.

VAT is not simply a percentage added to your quotes. The scheme you use affects when you pay HMRC, what VAT you can reclaim, the records you need to keep and, crucially, the pressure on your cash flow. The cheapest-looking option is not always the best one once labour, materials, CIS work and late-paying customers are taken into account.

When a builder needs to register for VAT

You must register if your taxable turnover exceeds the VAT registration threshold, currently £90,000, in any rolling 12-month period. This is not based on your accounts year or the tax year. You need to review turnover continuously, so a run of larger contracts can create a registration obligation sooner than expected.

You may also register voluntarily below the threshold. This can make sense where you buy a lot of standard-rated materials, tools or plant and work mainly for VAT-registered contractors or commercial clients. They can normally reclaim the VAT you charge, while you may reclaim VAT on legitimate business purchases.

The trade-off is that VAT registration adds administration and can increase your price to private customers who cannot reclaim VAT. A builder focused on domestic repairs, for example, needs to consider whether a 20% VAT charge will affect competitiveness before registering voluntarily.

VAT scheme guide for builders: the main choices

Most small construction businesses will look at standard VAT accounting, the Cash Accounting Scheme or the Flat Rate Scheme. The Annual Accounting Scheme can also help some established businesses, but it is less commonly the starting point for a growing builder.

Standard VAT accounting

Under standard VAT accounting, you account for VAT according to the invoice date or, in some cases, the date payment is received or a service is completed. You pay HMRC the output VAT charged to customers, less input VAT on eligible purchases.

This is usually the clearest option for a business with regular bookkeeping, reliable customers and significant materials or subcontractor costs. You can normally reclaim VAT on qualifying purchases as soon as you hold a valid VAT invoice, rather than waiting until you have paid the supplier.

The drawback is obvious to anyone who has chased a contractor for payment: you can owe HMRC VAT before the customer has paid your invoice. On a large job with 30 or 60-day payment terms, that can leave a real hole in working capital.

Cash Accounting Scheme

Cash accounting allows you to account for VAT when money is received from customers and paid to suppliers. For many sole trader builders and small limited companies, this is the most practical route because it follows the money in the bank rather than the invoices still sitting unpaid.

You can generally join if your VAT taxable turnover is no more than £1.35 million. You must leave if it exceeds £1.6 million. It is particularly useful where main contractors pay slowly, staged invoices are common or you have occasional bad debts.

There is a balance to strike. You cannot reclaim VAT on a supplier invoice until you have paid it. If you buy a large amount of materials on credit, standard accounting may give you earlier VAT recovery. Cash accounting works best where protecting cash flow matters more than reclaiming input VAT at the earliest possible point.

Flat Rate Scheme

The Flat Rate Scheme is designed to reduce the bookkeeping involved in VAT. Instead of calculating VAT on every sale and purchase, you charge customers VAT in the normal way but pay HMRC a fixed percentage of your VAT-inclusive turnover. Builders should never assume the scheme is automatically simpler or cheaper.

You can normally join if your expected taxable turnover, excluding VAT, is £150,000 or less. Different activities have different percentages. Construction-related work may fall within a construction services category, but the correct rate depends on what you actually supply, not simply the fact that you work on site.

The key limitation is input VAT. In most cases, you cannot reclaim VAT separately on materials, fuel, tools and other day-to-day costs. There is a limited exception for certain capital assets costing £2,000 or more including VAT. A first-year VAT registration discount may apply, but it should not be the only reason to choose the scheme.

The limited cost trader rules are where many trades get caught out. If your spend on relevant goods is low compared with turnover, you may have to use the higher 16.5% flat rate. Labour-only subcontractors, or businesses with high labour and low material costs, often fall into this category. At that point, the Flat Rate Scheme can cost more than standard VAT accounting.

Before joining, compare actual figures from recent jobs. Look at VAT charged to customers, VAT paid on materials and business purchases, the likely flat rate percentage, and whether the limited cost trader test applies. A quick calculation based on one good month can be misleading.

Annual Accounting Scheme

Annual accounting means submitting one VAT return per year while making regular interim payments. It can reduce the number of returns to prepare and may suit a stable business with predictable turnover. You can usually join below £1.35 million of taxable turnover.

For builders with uneven work, it is not always ideal. If your turnover drops or margins tighten, the interim payments can feel out of step with the cash coming in. It is often more useful for an established company with consistent monthly trading than for a contractor moving between projects.

Construction VAT issues that affect the decision

Your VAT scheme is only part of the picture. Construction has several rules that can change how a job is invoiced and reported.

The domestic reverse charge applies to certain construction services supplied between VAT-registered businesses within the CIS. Where it applies, the subcontractor does not charge VAT in the usual way. Instead, the customer accounts for the VAT on its own return. This can reduce the cash received by subcontractors, so it needs to be built into cash-flow planning from the outset.

Do not confuse CIS with VAT. CIS deductions are payments on account towards tax and National Insurance; they are not VAT. A CIS deduction statement does not replace a VAT invoice, and VAT must still be recorded correctly in your bookkeeping.

New-build work, qualifying conversions and certain residential alterations can have zero-rated or reduced-rated VAT treatment. Repairs and maintenance are commonly standard-rated, but the detail matters. The nature of the property, the scope of work, who is supplying materials and the evidence held can all affect the result. Guessing the rate from a customer’s description of the job is risky.

If you are supplying labour and materials, make sure invoices clearly distinguish the work carried out, the VAT rate used and whether the reverse charge applies. Keep contracts, purchase invoices, completion certificates and any evidence supporting zero or reduced rating. These records matter if HMRC asks questions later.

Keep VAT records workable, not just compliant

VAT-registered businesses must keep digital records and submit returns through Making Tax Digital-compatible software. For a builder, the practical aim is to record income and costs as they happen, rather than trying to rebuild a quarter from a pile of receipts in the van.

Use one business bank account where possible, photograph receipts promptly and make sure invoices show the right customer details, VAT number and treatment. Code materials, plant hire, fuel, professional costs and subcontractor payments consistently. If a job is reverse charged or zero-rated, flag it at the point of invoicing rather than trying to correct it at return time.

This also makes it easier to spot whether your current scheme is still right. A Flat Rate Scheme that worked when you were labour-heavy may no longer work once you start taking on bigger material-led contracts. Equally, a business approaching the VAT threshold should plan before the registration date, not after HMRC has notified it of a late registration.

The right VAT scheme should support the way you quote, buy and get paid. If you are unsure, bring recent invoices, material costs and subcontractor records together before making a decision. A proper comparison can prevent an avoidable VAT bill and give you more confidence when pricing the next job.