The VAT tipping point: what construction businesses need to know
So, there you are, happily working away in your business, bringing in decent monthly revenue and hitting your profit targets, when BOOM — someone tells you that you need to register for VAT.
Depending on the work you do and who your customers are, that can have a significant effect on your prices, margins and cash flow.
But VAT registration does not affect every construction business in the same way. For some, it increases costs. For others, it can improve profitability.
First, let’s get the registration rules straight.
When do you need to register for VAT?
For a UK-established business, VAT registration is normally required when either:
Your VAT-taxable turnover exceeds £90,000 over a rolling 12-month period.
You expect your VAT-taxable turnover to exceed £90,000 in the next 30 days alone.
The threshold relates to turnover, not profit, and has nothing to do with your financial year.
Check your previous 12 months’ taxable turnover at the end of each month. For example, at 31 October 2026, you would review the period from 1 November 2025 to 31 October 2026.
If you first exceed the threshold at the end of October, you normally need to notify HMRC by 30 November, with registration taking effect from 1 December. The forward-looking 30-day test has different timing rules, so a large new contract can trigger registration sooner.
Zero-rated does not mean exempt
VAT-taxable turnover includes standard-rated, reduced-rated and zero-rated sales.
Zero-rated work is charged at 0%, but it still counts towards the registration threshold. Exempt supplies are different and generally do not count.
Businesses making wholly or mainly zero-rated supplies may be able to apply for exemption from registration. However, registering can be beneficial where it allows recovery of VAT on eligible costs.
Construction has specific rules. Qualifying new-home construction can be zero-rated, while certain residential conversions and qualifying renovations can attract 5%. Most ordinary repair and improvement work is standard-rated at 20%.
Do not assume that every new-build-related invoice, conversion or disability adaptation qualifies for relief. The conditions and the particular supply matter.
Selling to other businesses
Where your customer is VAT registered and entitled to recover the VAT in full, adding VAT to an agreed net price will generally leave their underlying cost unchanged.
Your business can also recover VAT on eligible purchases, subject to the normal rules. However, not every business customer is VAT registered, and registration does not mean a customer can recover every VAT charge.
Construction businesses also need to consider the domestic reverse charge.
For qualifying standard-rated or reduced-rated construction services within CIS, supplied between VAT-registered businesses, the customer may need to account for the VAT instead of paying it to the supplier. Exceptions include supplies to customers who have properly notified their end-user or qualifying intermediary status.
Check the conditions before invoicing. Zero-rated services are not subject to the construction reverse charge.
Supplying zero-rated construction services
A business supplying qualifying zero-rated work can often benefit from registration: it charges no output VAT on that work but can recover VAT on eligible costs.
Those costs might include materials purchased from merchants, tools, equipment and overheads.
It is incorrect to assume that materials are automatically zero-rated because they will be used on a new build. Merchants normally charge standard-rate VAT on most materials. A contractor’s supply and incorporation of qualifying building materials may then follow the VAT treatment of the construction service.
Recovery restrictions can apply, particularly to developers and certain goods incorporated into properties.
Selling standard-rated work to householders
This is where registration can be more difficult commercially.
A householder normally cannot reclaim VAT. If a bathroom installation previously cost £5,000, adding 20% takes the customer’s bill to £6,000.
You might increase prices, absorb some of the VAT, or combine the two.
If you keep a standard-rated job’s total customer price at £2,000, that includes £333.33 of output VAT, leaving £1,666.67 before costs.
However, eligible input VAT recovered on purchases reduces the amount payable to HMRC. The effect on profit depends on your cost structure as well as your selling price.
Three examples: different businesses, different results
The following are simplified full-year illustrations under normal VAT accounting. They isolate the effect of VAT at the same sales volumes and underlying supplier prices; they do not model the registration date or suggest a business can trade above the threshold indefinitely without registering.
Example 1: Champion Homes — qualifying new-build construction
Assume all customer sales qualify for zero rating.
Annual customer receipts are £120,000. Cash costs total £40,000: £24,000 of eligible standard-rated purchases, including £4,000 VAT, plus £16,000 of costs carrying no VAT.
| VAT calculation | Amount |
|---|---|
| Output VAT on sales | £0 |
| Recoverable input VAT | £4,000 |
| Net VAT repayment | £4,000 |
With no output VAT and £4,000 of recoverable input VAT, registration improves the margin by £4,000, before administration costs and other changes.
Example 2: Waters & Co Plumbers — standard-rated work for householders
Assume annual customer receipts remain at £120,000, including VAT: the business absorbs VAT within its existing prices.
Eligible standard-rated costs total £18,000, including £3,000 VAT.
| VAT calculation | Amount |
|---|---|
| Customer receipts, including VAT | £120,000 |
| Sales excluding VAT | £100,000 |
| Output VAT | £20,000 |
| Recoverable input VAT | £3,000 |
| Net VAT payable | £17,000 |
At unchanged customer prices and sales volumes, the reduction in margin is £17,000, before other changes.
This illustrates why businesses with relatively low VAT-bearing costs can feel a substantial impact.
Example 3: AB Facilities Management — business customers
Assume annual net sales remain £120,000 and VAT can be added to the price. Customers can recover it in full, and the supplies in this example are subject to normal VAT invoicing rather than the construction reverse charge.
Eligible standard-rated costs total £19,200, including £3,200 VAT.
| VAT calculation | Amount |
|---|---|
| Sales excluding VAT | £120,000 |
| Output VAT charged to customers | £24,000 |
| Recoverable input VAT | £3,200 |
| Net VAT payable | £20,800 |
The £20,800 payment to HMRC is not an equivalent loss of profit: the business collected £24,000 of VAT from customers.
Recovering £3,200 of input VAT improves its margin by £3,200, before administration costs and other changes.
Could the Flat Rate Scheme help?
Possibly, but it needs a calculation.
Under the Flat Rate Scheme, you generally charge customers VAT as normal, then pay HMRC a percentage of your VAT-inclusive turnover. You normally cannot separately reclaim VAT on purchases, apart from limited exceptions for qualifying capital goods.
Relevant sector rates include:
9.5% for general building or construction services.
14.5% for labour-only building or construction services.
For this classification, labour-only generally means supplied materials represent less than 10% of the turnover from those services.
However, a business meeting the separate limited-cost business rules must normally use 16.5%, regardless of its sector rate.
Eligible businesses can receive a one-percentage-point reduction during their first year of VAT registration. The normal joining limit is expected taxable turnover of no more than £150,000 excluding VAT over the next year, subject to other conditions.
Construction reverse-charge sales are excluded from the flat-rate calculation, but the scheme still generally restricts recovery of VAT on materials and overheads. Zero-rated sales also need careful consideration.
The scheme can simplify administration. It does not automatically produce a saving.
Build VAT into your pricing early
When setting prices, model what the business would look like after registration.
Work out:
Which VAT rates apply to your jobs.
Which customers can recover VAT.
How much input VAT you could reclaim.
Whether existing quotes or contracts allow VAT to be added.
What prices and sales volumes would protect your required profit.
Planning ahead gives you more options than discovering the issue after agreeing a fixed customer price.
What about splitting the business?
There can be legitimate reasons to operate separate businesses. But creating another company, using another trading name or putting activities into someone else’s name does not automatically create a valid separation for VAT.
HMRC can challenge artificial separation resulting in VAT avoidance, considering financial, economic and organisational links.
Different ownership is neither a universal requirement for genuine separation nor a guarantee that HMRC will accept it. Get the structure reviewed before making changes.
Should you stay below the threshold?
For an owner who deliberately wants a small business, limiting activity may be a reasonable commercial choice.
But “stay below the threshold” should not be automatic advice to someone who wants to grow.
Compare the profit, workload and cash flow at different sales levels. Registration can create a difficult transition where customer prices cannot rise enough, but that does not mean growth will always leave you worse off.
Also remember that VAT is not simply charged on the slice of turnover above £90,000. Once registration takes effect, the appropriate VAT treatment applies to taxable supplies from that date.
Plan the transition around profit
The VAT tipping point needs more than a quick look at turnover. Your customers, prices, job mix, costs and growth plans all affect the answer.
Before deciding to increase prices, restrict work or change your structure, get a forecast showing what registration means for your business.
The Acumenica team can help you work through the numbers and plan your next move. Call 03330 166559 or complete our contact form.
Updated 29 October 2026. Examples are illustrative and assume full recovery of the input VAT identified.
