Property development and the CIS: two routes in
A property developer can fall inside the Construction Industry Scheme in two distinct ways, and confusing them leads to misunderstanding the compliance obligations that result.
The first route is as a mainstream contractor. A developer that builds properties itself, directly engaging subcontractors for groundworks, structural work, fit-out and finishing, is in the construction trade for CIS purposes. The obligation to register as a CIS contractor and deduct from the first subcontractor payment applies regardless of whether the developer considers its primary activity to be construction or development. Building for sale is construction.
The second route is as a deemed contractor. This catches businesses that are not primarily in the construction trade but that spend more than £3 million on construction in a rolling 12-month period. A developer that commissions all its construction through a single main contractor, and does not directly engage subcontractors itself, may not be in the construction trade. But once its total construction expenditure crosses the threshold, the full CIS contractor regime applies.
| Developer type | CIS position | Trigger |
|---|---|---|
| Developer engaging subcontractors directly for construction work | Mainstream contractor | First subcontractor payment |
| Developer commissioning a main contractor (not directly engaging subs) | Potentially deemed contractor | Rolling 12-month construction spend exceeds £3m |
| Investor buying completed properties for letting, no construction commissioned | Outside CIS | No construction spend threshold crossed |
A large development group may have several entities, some as mainstream contractors and some as deemed contractors, depending on how the group is structured. Each entity's CIS position is assessed separately.
The £3 million rolling threshold: how it works
The deemed contractor test is a rolling 12-month calculation, not a calendar-year or accounting-period figure. The GOV.UK guidance states the test as: "your business does not do construction work but you have spent more than £3 million on construction in the 12 months since you made your first payment."
The rolling 12-month approach means the threshold can be crossed at any point in the year as cumulative spend builds. A developer that commissions a major residential scheme in January 2026 and reaches £3 million in construction spend by September 2026 must register for CIS in September, not at its next year end.
Once registered, the developer must verify all subcontractors, deduct at the appropriate rates, file CIS300 monthly returns, issue deduction statements within 14 days of each payment, and from April 2026 file nil returns in months with no subcontractor activity. These are the same obligations as a mainstream contractor.
A one-off large project that pushes spend above £3 million in one rolling period brings the deemed contractor rules into play for that period. If the development programme subsequently contracts and spend falls sustainably below £3 million, the developer can approach HMRC about deregistration, though HMRC will want to be satisfied the change is genuine and sustained before agreeing to it.
The £1,000 de minimis: what it covers and what it does not
Regulations 18 and 19 of The Income Tax (Construction Industry Scheme) Regulations 2005 (SI 2005/2045) provide that a payment is not a CIS contract payment where the total payments under the contract, excluding the direct cost of materials, are not expected to exceed £1,000. This is a per-contract test, not a cumulative test.
In practice, this excludes very small one-off construction engagements from the CIS deduction requirement. A developer who commissions minor repair work for £800 (labour only) is not required to deduct CIS from that payment if the contract is not expected to exceed £1,000 in total.
The de minimis rule does not affect the deemed contractor threshold in any way. It does not allow a developer to exclude small contracts from the £3 million calculation. It is a per-contract deduction exemption, not a threshold adjustment. A developer whose rolling 12-month construction spend is £3.2 million does not reduce that figure by excluding £1,000-or-less contracts from the count.
| What the £1,000 rule does | What the £1,000 rule does not do |
|---|---|
| Exempts payments under contracts where total payments (ex. materials) are below £1,000 from the CIS deduction requirement | Reduce the £3m deemed contractor threshold |
| Applies on a per-contract basis | Apply if the contract is likely to exceed £1,000 at any point |
| Removes the deduction obligation for that specific payment | Remove the registration obligation once the deemed contractor threshold is crossed |
Developer-as-investor vs developer-as-builder: does the distinction affect CIS?
A common question in development circles is whether building for sale versus building to hold and let affects the CIS position. The short answer is no. Both routes can produce a deemed contractor obligation once the £3 million spend threshold is crossed. The CIS deduction rules apply identically whether the development is for sale or for investment.
Where the distinction does matter is in VAT. New-build residential housing sold as a freehold or long lease is zero-rated for VAT. Construction of residential properties for letting may be differently rated depending on the structure of the supply. The VAT treatment of the final supply affects the recovery of input VAT on the construction costs, but it does not affect the CIS obligations during the build.
A developer building commercial property for investment faces the same CIS analysis as one building residential property. The construction operations are CIS-covered regardless of what will ultimately happen to the completed building.
New-build VAT zero-rating and the domestic reverse charge
The VAT domestic reverse charge (DRC) for construction services has applied since 1 March 2021. Under DRC, where five conditions are all met, the customer (not the supplier) accounts for the VAT to HMRC. One of those five conditions is that the supply is standard-rated or reduced-rated.
New-build residential construction is zero-rated for VAT. Because the supply is zero-rated, the fifth DRC condition is not met, and the domestic reverse charge does not apply. A groundworks subcontractor invoicing a developer for foundation work on a new-build residential scheme does not use the reverse charge. Normal VAT rules apply: the subcontractor either charges VAT in the usual way (if VAT-registered and the supply is standard-rated) or charges at zero if the specific supply qualifies for zero-rating.
CIS still applies to those same payments. The DRC and CIS are separate regimes. A payment for new-build construction work is exempt from DRC because the supply is zero-rated, but it is still subject to CIS if the developer is a registered contractor or deemed contractor. Subcontractors sometimes assume that the absence of DRC means CIS does not apply. It does.
For mixed-use developments where some elements are standard-rated and some zero-rated, the DRC position requires supply-by-supply analysis. Our guide to the VAT reverse charge for construction services covers the five-condition test and the end-user exception in full.
What a deemed contractor developer must do: the obligations checklist
Once the £3 million threshold is crossed and registration is in place, a property developer has the same monthly compliance cycle as any mainstream contractor:
Verify before first payment. Before making the first payment to any subcontractor, verify their CIS status with HMRC. HMRC returns 0% (GPS), 20% (registered) or 30% (unregistered). That rate is applied to the labour element only of the payment. Materials the subcontractor buys for the job are excluded from the deduction base.
Monthly CIS300 return. File by the 19th of the following tax month. Tax months run to the 5th. The return covers every subcontractor paid in the month. Payment of deducted amounts to HMRC is due by the 22nd (electronic) or the 19th (cheque).
Nil returns from April 2026. Where no subcontractor payments are made in a given tax month, a CIS300 nil return must be filed by the 19th or HMRC must be pre-notified of inactivity. This obligation was reinstated from 6 April 2026 after being removed in 2015. A developer with seasonal or phase-gated development activity will have months with no subcontractor payments and must file nil returns in each of them.
Deduction statements within 14 days. After each payment, issue a payment and deduction statement to the subcontractor within 14 days showing the gross amount paid, the materials element, the deduction rate and the amount withheld.
The monthly responsibilities and the penalty ladder for late filing are covered in our guide to CIS contractor monthly responsibilities. The full deemed contractor position, including which types of non-construction businesses the rules catch, is in our guide to deemed contractors explained.
April 2026 GPS anti-fraud due-diligence for deemed contractors
Finance Act 2026 (c. 11, Royal Assent 18 March 2026) inserts FA 2004 ss.62A/62B, extending the GPS anti-fraud framework to all contractors, including deemed contractors. From 6 April 2026:
Knowledge-based penalty. A contractor that makes a payment knowing, or with reason to know, that a connected party has deliberately failed to comply with CIS is liable to a penalty of 20% of the payment (s.62A). The "should have known" standard means that failing to carry out due diligence is itself grounds for the penalty. No fraudulent intent by the developer is required.
GPS revocation and five-year ban. Where a subcontractor's GPS is revoked on fraud-related grounds connected to a developer's supply chain, the five-year reapplication ban applies to that subcontractor. A developer using GPS subcontractors at 0% deduction and failing to perform due diligence risks triggering revocation for those subcontractors.
Three-step due diligence. Before each subcontractor payment, the developer must: re-verify the subcontractor's CIS status with HMRC, run a Companies House legitimacy check on each subcontractor that is a limited company, and verify that the bank account name matches the registered business name. All three steps must be documented.
For a developer paying a relatively small number of subcontractors, the due-diligence protocol is manageable if built into the payment approval process. Embedding the three checks into the payment run documentation, and retaining the evidence, is the practical response. The broader anti-fraud framework and supply-chain compliance obligations are covered in our guide to CIS supply chain compliance and due diligence.
GPS eligibility for property developer subcontractors
Subcontractors working on a developer's sites may hold Gross Payment Status, receiving payments at 0% deduction. From the developer's perspective as a contractor, GPS subcontractors reduce the CIS administration burden on the payment side (no deduction calculation, no deduction amount on the CIS300), but from April 2026 the due-diligence obligation applies regardless of GPS status. Re-verification, Companies House check and bank name check are required before paying GPS-holding subcontractors as well as standard-rated ones.
A subcontractor that is a limited company and regularly works on development projects can qualify for GPS if its net CIS turnover reaches £30,000 per director or £100,000 total and it passes the compliance test. The GPS checker calculator at CIS GPS eligibility checker works through the qualifying tests on the per-director and total-turnover basis.