What contractors need to know about the construction industry scheme (cis)
The Construction Industry Scheme (CIS) regulates tax payments in the UK construction sector, requiring contractors to register, verify subcontractors, deduct tax, and file monthly returns to ensure compliance and avoid penalties.

What Contractors Need to Know About the Construction Industry Scheme (CIS)
The Construction Industry Scheme (CIS) is an essential framework that governs tax payments within the UK's construction sector. Established by HM Revenue and Customs (HMRC), the CIS aims to streamline tax deductions for contractors and subcontractors, ensuring that the correct amount of tax is paid on time. However, despite its importance, many contractors find the scheme complex and confusing. In this article, we’ll break down the key aspects of the CIS and explain what contractors need to know to stay compliant and avoid penalties.
Who Does the CIS Apply To?
The CIS applies to all contractors and subcontractors working in the UK construction industry. This includes companies, self-employed individuals, and partnerships involved in a wide range of construction activities. According to HMRC, the scheme covers businesses involved in activities such as:
- Site preparation
- Demolition and dismantling
- Building work, including alterations, repairs, and extensions
- Installing systems for heating, lighting, power, water, and ventilation
- Decorating and cleaning work following construction
It is important to note that the CIS applies not only to contractors who directly perform construction work but also to those who manage or oversee construction projects, including property developers and other organisations not typically considered part of the construction sector.
Contractor Responsibilities Under the CIS
As a contractor, you have several key responsibilities under the CIS. Failure to meet these obligations can result in fines and penalties from HMRC. Here are the primary duties contractors must fulfil:
1. Register with HMRC
Contractors must register with HMRC before engaging in any construction work under the CIS. Registration is mandatory, and you can do so online via the HMRC website. Subcontractors are not required to register, but doing so can reduce the tax deductions taken from their payments.
2. Verify Subcontractors
Before paying a subcontractor, contractors are required to verify their status with HMRC. This process ensures that the correct tax deduction rate is applied. Subcontractors who are registered with the CIS will have a standard tax deduction rate of 20%, while unregistered subcontractors will face a higher rate of 30%.
3. Deduct Tax
The core function of the CIS is to ensure that contractors deduct tax from their subcontractors’ payments. These deductions serve as an advance payment towards the subcontractor’s income tax and National Insurance contributions. The tax deducted must be paid to HMRC, and contractors are responsible for ensuring that this process is completed accurately and on time.
4. File Monthly Returns
Contractors are required to submit monthly returns to HMRC, detailing the payments made to subcontractors and the deductions taken. These returns must be filed by the 19th of every month following the tax period. Failure to submit returns or submitting incorrect information can result in penalties.
5. Provide Payment and Deduction Statements
Each time a contractor makes a payment to a subcontractor, they must provide a payment and deduction statement. This document details the amount paid, the tax deducted, and any other relevant information. These statements are essential for subcontractors when they file their tax returns.
Subcontractor Responsibilities
While the bulk of the responsibilities fall on contractors, subcontractors also have their own obligations under the CIS. Subcontractors can choose to register with HMRC, and doing so will reduce the amount of tax deducted from their payments. Registered subcontractors have a tax deduction rate of 20%, whereas unregistered subcontractors will face a 30% deduction.
Subcontractors should also keep detailed records of their payments and deductions, as these will be necessary when filing their annual tax returns. Any overpaid tax can be reclaimed from HMRC at the end of the tax year, provided the correct documentation is in place.
Gross Payment Status
For subcontractors who meet certain criteria, there is an option to apply for “Gross Payment Status” under the CIS. This status allows subcontractors to receive their payments in full without any deductions for tax. To qualify for Gross Payment Status, subcontractors must demonstrate that they have a good compliance record with HMRC, including:
- Keeping up-to-date with all tax returns and payments
- Operating a business in the UK
- Meeting minimum turnover requirements
While Gross Payment Status can provide significant cash flow benefits, subcontractors should be aware that they will still be responsible for paying the appropriate tax at the end of the year.
Penalties for Non-Compliance
Compliance with the CIS is essential, as HMRC has strict penalties in place for those who fail to meet their obligations. These penalties can include fines for late or incorrect monthly returns, failure to verify subcontractors, and not providing payment and deduction statements. Penalties can range from £100 for a missed return to thousands of pounds for more severe or persistent non-compliance.
It’s important for contractors to stay organised and ensure that all CIS-related duties are completed on time to avoid these costly penalties.
Staying Compliant with the CIS
To avoid the pitfalls of non-compliance, contractors should take proactive steps to ensure they meet their CIS obligations. Here are some tips for staying compliant:
Use accounting software: Many accounting platforms offer CIS-specific features that can help contractors manage deductions, verify subcontractors, and submit monthly returns.
Keep accurate records: Detailed record-keeping is essential under the CIS. Contractors should maintain thorough documentation of all payments, deductions, and subcontractor verifications.
Stay up-to-date with HMRC guidance: The rules surrounding the CIS can change, so it’s important for contractors to stay informed by regularly checking HMRC’s website for updates.
Consider professional advice: For contractors who find the CIS overwhelming, seeking advice from an accountant or tax professional can be a worthwhile investment. A professional can ensure that all responsibilities are met and help avoid costly penalties.
Conclusion
The Construction Industry Scheme (CIS) is a vital part of the UK construction sector, ensuring that tax is correctly deducted from payments to subcontractors. However, the scheme can be complex, and contractors must take care to meet their obligations to avoid penalties. By registering with HMRC, verifying subcontractors, deducting the correct amount of tax, and submitting monthly returns, contractors can ensure they remain compliant and contribute to the smooth operation of the construction industry.
For subcontractors, registering with the CIS and keeping accurate records of payments and deductions is essential for managing tax liabilities and ensuring that overpaid tax can be reclaimed. By understanding the key elements of the CIS, both contractors and subcontractors can navigate the scheme effectively and avoid costly mistakes.