Construction tax compliance guide: 2026/27

UK CIS Deep-Dive 2026/27: 20% / 30% / 0% Rates, GPS, Returns

Construction Industry Scheme complete guide covering the three CIS rates (20% registered, 30% unregistered, 0% Gross Payment Status), Gross Payment Status £30,000+ turnover qualification across sole-trader, partnership and Limited company structures, the contractor verification process, monthly CIS300 returns by 19th of month, materials carve-out mechanics, sub-contractor reclaim via Self Assessment or CT600, the Domestic Reverse Charge VAT interaction since March 2021, and the £3m deemed-contractor threshold for non-construction businesses.

Overview - what CIS does and why

The Construction Industry Scheme (CIS) is an HMRC withholding tax regime that applies to payments made by contractors to sub-contractors for construction work in the UK. Under CIS, the paying contractor deducts a percentage of the sub-contractor labour element at source and pays it to HMRC against the sub-contractor's eventual Income Tax or Corporation Tax liability. The scheme was introduced in 1971 and reformed substantially in 2007 to its current shape under Finance Act 2004 Part 3 chapter 3 and the Construction Industry Scheme Regulations 2005 (SI 2005/2045). The structural purpose is to prevent the substantial cash-economy tax evasion that the UK construction trades historically supported - by withholding tax at the point of payment, HMRC captures revenue that would otherwise be lost to non-filers and undeclared income.

Three CIS payment rates apply depending on the sub-contractor status. 20% standard rate for CIS-registered sub-contractors who have provided a verified Unique Tax Reference. 30% higher rate for unregistered sub-contractors or those HMRC has matched as non-compliant. 0% Gross Payment Status for sub-contractors who have qualified through HMRC's turnover, compliance and business tests. The CIS deduction applies only to the labour element of the invoice - materials are excluded. Sub-contractors under the 20% / 30% regime reclaim the deductions via their annual tax return (Self Assessment for sole traders / partnerships, CT600 for Limited companies).

CIS applies broadly across UK construction: site preparation, civil engineering, building work, installation, decoration, demolition, repair, restoration. Both contractors and sub-contractors must register with HMRC. The contractor must verify each new sub-contractor before the first payment and submit monthly CIS300 returns by the 19th of each month listing all payments and deductions. The 2021 introduction of the Domestic Reverse Charge for VAT in construction added a parallel obligation but did NOT change the CIS deduction position - CIS continues to apply on the labour element separately from the VAT mechanism. The 2021 raise of the "deemed contractor" threshold from £1m to £3m brought CIS into scope for any non-construction business spending over £3m on construction operations in any rolling 12-month period.

Worked example - sub-contractor invoice

A bricklayer sub-contractor invoices a main contractor for £50,000 of labour and £12,000 of materials supplied (total invoice £62,000). CIS deduction applies to the labour element only.

Status	CIS rate	Deduction	Net received	Notes
CIS-registered	20%	£10,000	£52,000	Labour £50k × 20% = £10k deducted. Materials £12k paid in full.
Unregistered	30%	£15,000	£47,000	Labour £50k × 30% = £15k deducted. Cash flow hit £5k larger than registered route.
Gross Payment Status	0%	£0	£62,000	No deduction at source. Sub-contractor pays tax via SA / CT600 at year-end.

The cash-flow difference between unregistered (£15,000 deducted) and Gross Payment Status (£0 deducted) is £15,000 per £50,000 of labour - a 30% increase in immediate cash received. The tax bill at year-end is the same under all three routes (computed on actual taxable profit), but the timing differs materially. GPS sub-contractors have to manage cash for their own tax bill at year-end (typically 31 January) rather than the cash being deducted as they invoice. The 20% standard rate is generally cash-neutral for established sub-contractors who would otherwise have to set aside roughly 20% for their own tax.

Gross Payment Status (GPS) - the three tests

HMRC grants GPS only to sub-contractors who pass all three statutory tests. The application is made via the gov.uk CIS service after CIS registration is complete:

Entity type	Turnover test	Compliance test	Business test
Sole trader	£30,000+ net construction labour turnover / year	Filed all tax returns and paid all tax due in the prior 12 months on time	Carry on UK construction work via permanent UK establishment, bank account, etc.
Partnership	£30,000+ per partner OR £200,000+ aggregate net labour turnover	Partnership and all partners compliance test	Same as sole trader test applied at partnership level
Limited company	£30,000+ per director OR £100,000+ aggregate net labour turnover	Company and all directors filed/paid on time in prior 12 months	UK construction operations through registered UK office

GPS is reviewed by HMRC annually (or triggered by compliance failure). Common reasons for GPS withdrawal: late SA filing, late VAT return, late PAYE submission, unpaid tax demand. Even a £200 unpaid Income Tax balance can trigger GPS withdrawal under HMRC's strict compliance test. Sub-contractors should monitor their compliance position continuously and resolve any unpaid tax or late return within HMRC's 14-day cure window where possible. Loss of GPS is a material cash-flow event: a £400,000-turnover sub-contractor moving from 0% to 20% deduction faces £80,000 of cash withheld from invoices over the year - typically a 2-3 month working-capital squeeze even with full reclaim at year-end.

Monthly CIS300 returns and penalties

Contractors must submit a CIS300 monthly return by the 19th of every month, covering the payment month ending the 5th of the same month. So the payment month 6 April to 5 May has a CIS300 return due by 19 May. The return lists every CIS sub-contractor paid in the month: name, UTR, gross payment (excluding VAT), materials value, CIS deduction at the verified rate. Even "nil returns" must be submitted where no CIS sub-contractor payments were made in the month - failure to submit triggers the late-return penalty regime.

Late return penalties stack quickly and are punitive:

Delay	Penalty	Notes
1 day late	£100 fixed penalty	Applied per return, not per sub-contractor.
2 months late	£200 fixed penalty (cumulative £300)	Additional £200 stacks on the initial £100.
6 months late	Greater of £300 OR 5% of CIS deducted (cumulative)	Begins the tax-geared phase that scales with the value of unpaid CIS.
12 months late	Further £300 or 5% of CIS deducted	Maximum case penalties can reach 100% of unpaid CIS where deliberate concealment is established.

The total annual penalty for missing all 12 monthly returns can exceed £3,000 even with no CIS due. Tax-geared penalties (5% of unpaid CIS) can reach 100% in cases of deliberate concealment. HMRC will not waive penalties for accidental late filing - the only realistic appeal is "reasonable excuse" which has a narrow definition (serious illness, IT system failure documented at time, bereavement of close family). Best-practice is to operate CIS via compatible accounting software (Xero, QuickBooks, Sage, FreeAgent, Iris, IRIS Practice Engine) that automatically generates the CIS300 from the payment records and submits via the HMRC API on the 18th of each month with a one-day buffer.

Domestic Reverse Charge VAT - the parallel obligation

Under DRC the sub-contractor invoices the contractor with no VAT added but marks the invoice "Reverse Charge - VAT to be accounted for by the customer at 20%". The contractor accounts for both the output and input VAT on their own VAT return (Box 1 = output VAT 20% of net; Box 4 = input VAT 20% of net; Box 6 = net value of supply; Box 7 = net value of supply). Net cash impact is typically zero because the contractor reclaims the input VAT in the same return. The fraud-prevention mechanism is that no cash VAT changes hands between sub-contractor and contractor - removing the "collect-and-disappear" opportunity.

DRC applies when: (a) both parties are VAT-registered AND (b) the supply falls within CIS AND (c) the customer is not an "end-user" (a business that consumes the construction output rather than reselling it as part of a wider construction project). End-users include: building owners using the work on their own premises, property developers selling completed properties to end-purchasers, and most occupiers commissioning construction work for their own use. End-user supplies continue under standard VAT rules where the sub-contractor charges VAT and remits it. Contractors operating up and down a multi-tier sub-contracting chain must communicate end-user status carefully to ensure correct DRC application throughout.

DRC does NOT change the CIS deduction position - CIS continues to apply on the labour element of the invoice separately from the VAT mechanism. A sub-contractor under DRC and 20% CIS issues an invoice for £50,000 labour + £12,000 materials = £62,000 with no VAT charged but marked "Reverse Charge"; the contractor deducts £10,000 CIS (20% of labour) and pays £52,000 net to the sub-contractor. The contractor then accounts for £12,400 (20% × £62,000) of output and input VAT on their own VAT return.

Deemed contractor rule - the £3m threshold

The "deemed contractor" rule extends CIS obligations to non-construction businesses that spend more than £3 million on construction operations in any rolling 12-month period. Threshold was £1m before April 2021, raised to £3m to reduce administrative burden on businesses commissioning occasional construction work. A property investment company, manufacturing business, large retail chain or hotel operator that commissions £3.5m of construction work in a rolling year (e.g. a major site refurbishment, new branch fit-out, head office reconstruction) becomes a deemed contractor and must register for CIS and operate CIS deductions on payments to construction sub-contractors.

Deemed contractor status persists until the spend rolls under the threshold for 12 consecutive months. The rule particularly catches commercial property developers, large landlords undertaking refurbishment programmes, and corporate occupiers commissioning multi-million-pound construction work. HMRC actively enforces the threshold and the rolling-12-month tracking obligation is material - non-construction businesses with significant construction spend should monitor monthly and prepare for CIS registration when approaching the £3m point. Specialist CIS advice strongly recommended for any non-construction business approaching the threshold; the operational change from non-contractor to deemed contractor requires monthly CIS300 returns, verification processes, and contractor accounting that most non-construction businesses do not have in place by default.

Frequently asked questions

What is the Construction Industry Scheme and who falls within it?

The Construction Industry Scheme (CIS) is an HMRC withholding tax regime that applies to payments made by contractors to sub-contractors for construction work in the UK. Under CIS, the paying contractor deducts a percentage of the sub-contractor invoice (excluding materials) at source and pays it to HMRC against the sub-contractor tax bill. The standard rate is 20% for CIS-registered sub-contractors and 30% for unregistered. CIS applies to all construction work as defined under the Construction Industry Scheme Regulations 2005: site preparation, civil engineering, building work, installation, demolition, decoration, repair, restoration. Both contractors and sub-contractors must register with HMRC. CIS-registered sub-contractors with sufficient turnover and compliance history can apply for Gross Payment Status, eliminating the deduction entirely.

What is the difference between 20%, 30% and Gross Payment Status?

Three CIS payment rates apply depending on the sub-contractor status. (1) 20% standard rate (CISR registered) - sub-contractor has registered with HMRC and provides a verified Unique Tax Reference (UTR). HMRC retains £20 of every £100 of net labour payment as a payment on account against the sub-contractor's eventual Income Tax or Corporation Tax liability. (2) 30% higher rate (unregistered) - sub-contractor has not registered with HMRC or has been "matched" by HMRC as non-compliant; default deduction is 30%. (3) Gross Payment Status (GPS, 0% deduction) - HMRC has granted GPS based on the sub-contractor's turnover, compliance and business tests; the contractor pays the gross invoice value with no CIS deduction. The sub-contractor accounts for tax via Self Assessment (sole trader/partnership) or CT600 (Limited company) at the standard rates that apply to the underlying business.

What construction work is in scope?

CIS applies to "construction operations" as defined under section 74 Finance Act 2004 and the Construction Industry Scheme Regulations 2005. Includes: site preparation (clearing, foundations, demolition); construction, alteration or repair of buildings and civil engineering works; installation of heating, lighting, ventilation, air conditioning, water, sewerage, drainage, refrigeration, fire-protection or any system of communication; internal cleaning of buildings carried out in the course of construction; external cleaning; decoration, painting, plumbing, electrical work; landscape gardening directly incidental to construction. Excluded operations include: architectural and surveying services (separate professional services); manufacture or delivery of materials only (no installation labour); operating or maintaining hotels, leisure facilities; sign-writing and erection of signs; carpet fitting (sometimes - check specific guidance).

How do I become CIS-registered as a sub-contractor?

Two-step process. (1) Register for Self Assessment first if not already registered: gov.uk/register-for-self-assessment. You will receive a Unique Tax Reference (UTR) and Government Gateway login. (2) Register for CIS as a sub-contractor: gov.uk/register-as-a-cis-subcontractor. Provide your UTR, National Insurance number, business name, trading address, and contact details. Registration takes typically 1-2 weeks for HMRC to verify and add you to the CIS subcontractor database. After registration, any contractor verifying your status before paying will receive the 20% standard rate code, not the 30% higher rate. The contractor must verify each new sub-contractor before the first payment - this is a mandatory step under the CIS verification regime.

How do I apply for Gross Payment Status?

Apply via the gov.uk CIS service after registering as a sub-contractor. HMRC tests three qualifying conditions. (1) Turnover test: net labour turnover excluding VAT and materials must be at least £30,000 for sole traders; £30,000 per partner or £200,000 aggregate for partnerships; £30,000 per director or £100,000 aggregate for Limited companies. (2) Compliance test: all tax returns filed and all tax paid on time in the previous 12 months. Any late filing or unpaid tax (above £100) in the period generally disqualifies. HMRC tests the sole trader / each partner / each director and company. (3) Business test: the applicant carries on construction operations or supplies labour for construction in the UK through a UK permanent establishment, with UK bank account, UK telephone, UK business address. Once GPS is granted it can be withdrawn if compliance fails (typically reviewed annually). The cash-flow benefit is substantial - removing the 20% upfront deduction means sub-contractor receives full invoice value, paying tax via standard SA / CT600.

What is the materials carve-out and how is it calculated?

CIS deduction applies only to the labour element of a sub-contractor invoice - materials are excluded. "Materials" for CIS purposes includes: physical goods used in the construction work (bricks, mortar, timber, paint, sealants, fixings, copper pipe, electrical cable, etc); plant hire where the sub-contractor is hiring it in to use on the job and passing the cost through; consumables used up in the work (sandpaper, adhesive, masking tape). Materials does NOT include: services provided by the sub-contractor (labour, supervision, design); travel and accommodation costs; profit margin or mark-up on materials. The materials line must be separately identified on the invoice with clear evidence of the actual cost - HMRC will challenge unclear or inflated materials claims. Many trades structure invoices with explicit "labour £X, materials £Y, total £X+Y" lines to make the carve-out calculation unambiguous. The contractor's verification system also requires the materials breakdown to apply the correct CIS deduction.

What are the contractor monthly return obligations?

Contractors must submit a CIS300 monthly return by the 19th of every month covering the payment month ending the previous 5th of the month. So the payment month 6 April to 5 May has a CIS300 return due by 19 May. The return must include details of every CIS sub-contractor paid in the month: name, UTR, gross payment (excluding VAT), materials value, CIS deduction at the verified rate. Even "nil returns" must be submitted where no CIS sub-contractor payments were made in the month - failure to submit a nil return triggers the late-return penalty regime. The return can be filed online via the HMRC Government Gateway CIS service or via compatible commercial software. The contractor must also issue CIS Payment and Deduction Statements to each sub-contractor by the 19th of the same month showing the deductions made.

How does a sub-contractor reclaim CIS deductions?

Sub-contractors under the 20% / 30% deduction regime reclaim the deductions via their annual tax return. (1) Sole traders and partnerships - claim CIS deductions on Self Assessment return SA103S or SA103F (self-employment short or full). The CIS deductions are credited against the Income Tax and Class 4 NIC liability for the year; any excess is refunded by HMRC typically within 8-12 weeks of SA submission. (2) Limited companies - claim CIS deductions against the company Corporation Tax liability on the CT600 return. Alternatively, if the company has overpaid CIS (deductions exceed CT liability), the company can claim the excess back against PAYE / NI liabilities via the EPS submission. Specialist software (Xero, QuickBooks, Sage, FreeAgent) automates the CIS reconciliation. The end-of-year CIS Payment and Deduction Statements from each contractor must be retained as supporting evidence of the deductions claimed.

What are the late-return penalties?

CIS300 monthly return late penalties are punitive and stack quickly. £100 fixed penalty if 1 day late, additional £200 if 2 months late (cumulative £300), greater of £300 or 5% of CIS deducted if 6 months late, further £300 or 5% if 12 months late. Tax-geared penalties (5% of the unpaid CIS) can scale to 100% in cases of deliberate concealment. The penalties apply per return - missing 3 consecutive monthly returns triggers 3 separate penalty assessments. Penalties for nil returns (where no CIS was due but the return was still required) are reduced under the Late Filing Penalty reforms but still apply at £100 per missed return. The total annual penalty for missing all 12 monthly returns can exceed £3,000 even with no CIS due. Pre-submission late filing always more efficient than post-submission appeal.

How does CIS interact with the Domestic Reverse Charge VAT?

The Domestic Reverse Charge (DRC) for construction services took effect 1 March 2021 under VAT Notice 735. It shifts the obligation to account for VAT on construction services from the supplier (sub-contractor) to the customer (contractor) where the construction work falls within CIS and both parties are VAT-registered. The sub-contractor issues an invoice marked "Reverse Charge - VAT to be accounted for by the customer" without adding VAT; the contractor accounts for both the output and input VAT on their own VAT return (typically with zero net impact because they reclaim the input VAT immediately). DRC reduces the risk of "missing trader" VAT fraud in the construction supply chain but operationally complicates invoicing for many trades. DRC does NOT change the CIS deduction position - CIS continues to apply on the labour element separately. End-user contractors (companies that consume the output rather than reselling it) and connected entities are excluded from DRC and continue under standard VAT rules.

What records must I keep?

Contractors must retain for at least 3 years: copies of all CIS300 monthly returns submitted; verification records for each sub-contractor (HMRC verification reference number and date); copies of all Payment and Deduction Statements issued to sub-contractors; payment records (bank statements, invoices, materials evidence); written agreements with sub-contractors. Sub-contractors must retain for at least 3 years: copies of all CIS Payment and Deduction Statements received; invoices issued with labour/materials breakdown; bank records showing payments received net of CIS; CIS reconciliation working showing total CIS deducted across all contractors in the year for SA / CT600 reconciliation. HMRC enquiries on CIS returns can run for up to 6 years (and 20 years for deliberate fraud). The 3-year record requirement is the statutory minimum but practical best-practice is to retain for 6 years matching standard SA / CT600 record-retention.

What is the new "deemed contractor" rule?

Most CIS contractors are themselves construction businesses paying sub-contractors directly. The "deemed contractor" rule extends CIS obligations to non-construction businesses that spend more than £3 million on construction operations in any rolling 12-month period. A property investment company, manufacturing business, or large retail chain that commissions £3.5m of construction work in a year (e.g. a major site refurbishment) becomes a "deemed contractor" and must register for CIS and operate CIS deductions on payments to construction sub-contractors. Threshold was £1m before April 2021, raised to £3m in 2021. Deemed contractor status persists until the spend rolls under the threshold for 12 consecutive months. The rule particularly catches commercial property developers and large landlords undertaking refurbishment programmes; HMRC actively enforces it and the threshold-tracking obligation is material. Specialist CIS advice strongly recommended for any non-construction business approaching the £3m spend level.

CIS calculator - interactive CIS deduction and net-receipt computation across 20% / 30% / 0% rates.
Self-employed calculator - sole trader and partnership profit + Class 4 NIC computation against which CIS deductions are credited.
Corporation tax calculator - Limited company CT against which CIS deductions are credited via CT600.
Bricklayer pay - CIS-typical trade with worked examples of 20% deduction across labour-heavy invoices.
Electrician pay - CIS sub-contractor for new-build and commercial work.
Plumber pay - same CIS sub-contractor model with materials carve-out commonly relevant.
Scaffolder pay - heavy CIS sub-contracting with industrial / petrochemical premium specialism.
Glazier pay - CIS for commercial shop-front and structural curtain wall work.
Sole trader vs Limited Company guide - structural choice that affects CIS reclaim mechanism.
UK VAT rates guide - includes Domestic Reverse Charge for construction services context.