The Construction Industry Scheme (CIS) is a specialised tax withholding regime in the UK that applies to payments made for construction work. If your business operates in the construction sector — whether as a contractor or subcontractor — understanding CIS is essential to ensure compliance with HMRC rules and manage your tax obligations effectively.
CIS is a tax system where contractors deduct money from payments to subcontractors and pass those deductions directly to HMRC. The deductions count as advance payments toward the subcontractor’s tax and National Insurance liabilities.
The scheme applies to most construction work, even if your business is not a dedicated construction company.
CIS applies to:
Contractors – businesses or individuals who pay subcontractors for construction work
Subcontractors – individuals or businesses carrying out construction work for contractors
If you fall into either category, you will need to register with HMRC and follow CIS rules when making or receiving payments for construction services.
Construction work includes a broad range of activities such as:
Building, altering, repairing, extending or demolishing structures
Site preparation and clearance
Painting and decorating
Installing systems for heating, lighting, water, etc.
Carpentry, plumbing and roofing services
Some activities, like the manufacture of construction materials off‑site, may fall outside the scheme.
If you are a contractor under CIS, your core duties include:
Registering for CIS
You must register with HMRC as a contractor before making payments to subcontractors.
Verifying Subcontractors
Before paying a subcontractor, you must verify their status with HMRC. This determines the rate of deduction to apply.
Making Deduction Calculations
Once verified, you must deduct the correct amount from subcontractor payments and pay those deductions to HMRC.
Providing CIS Statements
You must issue monthly CIS statements to subcontractors detailing the amounts paid and deducted.
Reporting and Payments to HMRC
CIS returns (typically monthly) must be filed with HMRC along with the deducted amounts.
Contractors who fail to meet these responsibilities face potential penalties and interest charges.
Subcontractors must:
Register for CIS
If you will work under CIS, you should register — even if you also have other income streams.
Provide Details to Contractors
Subcontractors must provide necessary information (e.g., unique taxpayer reference) so contractors can verify them and apply the correct deduction rate.
Maintain Accurate Records
Keep records of all CIS payments received, deductions made, and documentation from contractors.
Subcontractors may reclaim any over‑deducted tax through their Self Assessment return or by requesting CIS tax refunds from HMRC.
Once subcontractors are verified by HMRC, deduction rates are applied as follows:
Standard Deduction Rate
A standard lower rate of deduction applies to verified subcontractors.
Higher Deduction Rate
If a subcontractor is not verified, the contractor must deduct at a higher rate.
Gross Payment Status
Some subcontractors may qualify for gross payment status, meaning payments are made without CIS deductions. Eligibility depends on turnover and compliance history.
Contractors must file monthly CIS returns and pay deductions to HMRC by the 19th of the following tax month. Filing and payment deadlines must be met consistently to avoid penalties.
Monthly returns normally include:
Contractor details
Subcontractor details and verification status
Total payments made
Total deductions withheld
Both contractors and subcontractors must retain accurate records, including:
Payment details and CIS statements
Verification evidence
CIS returns and payment confirmations
Correspondence with HMRC
Good record keeping protects your business in the event of HMRC enquiries or audits.
Failing to register with HMRC before starting construction work can result in automatic penalties.
Not verifying subcontractors before payment can lead to incorrect deductions and penalties.
Late filing or late payments of CIS returns and deductions can attract interest and fines.
Inaccurate record keeping can also jeopardise compliance and may trigger HMRC enquiries.
CIS compliance can be administratively demanding, especially for businesses with multiple subcontractors or complex payment structures. Applegrow Financial Advisors can assist you with:
CIS registration and verification processes
Deduction calculations and reporting
Monthly return preparation and filing
Tax planning around subcontractor payments
Resolving HMRC enquiries or disputes
We work with your business to ensure CIS procedures are robust, accurate, and efficient — allowing you to focus on your core operations.
Contact Applegrow Financial Advisors today for expert support with the Construction Industry Scheme and related compliance matters.
