CIS Changes in 2026: How Construction Firms Can Prepare for Increased Scrutiny and Compliance
- Alexander Vaudejes
- Jun 30
- 4 min read
From 6 April 2026, important changes to the Construction Industry Scheme (CIS) came into effect. These reforms give HMRC greater powers to tackle fraud within construction supply chains and place increased compliance responsibilities on contractors.
For construction businesses, particularly small and medium-sized contractors, these changes mean greater scrutiny of subcontractors, stricter reporting requirements and significantly higher penalties for non-compliance.
At Vau Consult, we specialise in supporting construction businesses with CIS compliance, bookkeeping and accounting. Here's what you need to know.
1. Greater Focus on Supply Chain Compliance
The primary objective of the reforms is to reduce tax fraud and improve compliance across the construction industry.
Contractors are now expected to go beyond simply verifying subcontractors at the start of a project. HMRC expects businesses to demonstrate effective ongoing due diligence by:
Verifying subcontractors correctly before making payments.
Maintaining accurate and complete CIS records.
Monitoring subcontractors throughout the working relationship.
Identifying and responding to potential compliance risks.
CIS compliance is no longer a one-off administrative task—it has become an ongoing risk management responsibility.
2. Stronger HMRC Enforcement Powers
One of the most significant changes is the expansion of HMRC's enforcement powers.
Where HMRC believes a contractor knew or should reasonably have known they were involved in a fraudulent CIS-related arrangement, it can now:
Remove the contractor's Gross Payment Status (GPS).
Prevent reapplication for Gross Payment Status for five years (previously one year).
Recover any tax lost through the arrangement.
Charge penalties of up to 30% of the tax involved.
For many construction businesses, losing Gross Payment Status could have a serious impact on:
Cash flow
Working capital
Business reputation
Relationships with contractors and clients
This makes strong internal controls and documented due diligence more important than ever.
3. Mandatory CIS NIL Returns Return
From April 2026, contractors are once again required to submit monthly CIS NIL returns whenever no payments have been made to subcontractors, unless HMRC has been notified in advance.
Businesses that only use subcontractors occasionally are particularly at risk of overlooking this requirement.
Failure to submit NIL returns when required may result in unnecessary late filing penalties.
4. Payments to Public Bodies Removed from CIS
Payments made to local authorities and certain qualifying public sector organisations are now fully exempt from the Construction Industry Scheme.
This replaces the previous concession with a formal exemption, removing unnecessary CIS deductions and reporting requirements for eligible public-sector contracts.
For contractors working on local authority or government-funded projects, this change simplifies administration and reduces reporting obligations.
Who Will Be Most Affected?
Main Contractors
Businesses engaging subcontractors will experience the greatest impact, including:
Greater responsibility for subcontractor due diligence.
Increased exposure to HMRC penalties.
More detailed record-keeping requirements.
Higher compliance expectations throughout the supply chain.
Small and Medium Construction Businesses
Construction SMEs should prepare for:
More robust compliance procedures.
Increased administrative responsibilities.
Better subcontractor onboarding processes.
Ongoing monitoring of subcontractor compliance.
Subcontractors
Subcontractors should also expect:
Increased verification checks.
Greater scrutiny of tax compliance.
Higher risk of losing Gross Payment Status if compliance standards are not maintained.
What Construction Businesses Should Do Now
1. Review Your Subcontractor Onboarding Process
Before engaging any subcontractor, contractors should ensure appropriate checks are completed, including:
CIS verification.
VAT registration.
Company registration details.
Director information.
Bank account verification.
Identity and trading history where appropriate.
A structured onboarding process creates a clear audit trail and significantly reduces compliance risk.
2. Monitor Your Supply Chain Regularly
Compliance should not end once a subcontractor has been approved.
Construction businesses should regularly review for warning signs such as:
Frequent changes to bank account details.
Directors with insolvency or disqualification history.
Missing or cancelled VAT registrations.
Unusual trading patterns.
Inconsistent payment requests.
Regular monitoring helps identify risks before they become costly problems.
3. Strengthen Your CIS Reporting Processes
Ensure your business has systems in place to support:
Monthly CIS returns.
Mandatory NIL returns where applicable.
Accurate subcontractor payment records.
CIS deduction statements.
Complete audit trails for HMRC inspections.
Strong record-keeping is now a key part of CIS compliance.
4. Embrace Digital Compliance
Many construction businesses still rely on spreadsheets and manual processes.
As compliance expectations continue to increase, digital accounting systems can significantly reduce administrative burden while improving accuracy.
Modern software can assist with:
CIS verification.
Subcontractor management.
Payment tracking.
Compliance monitoring.
Automated reporting.
Digital document storage.
Moving towards technology-driven compliance helps minimise risk and saves valuable administrative time.
How Vau Consult Can Help
At Vau Consult, we work exclusively with construction businesses and understand the practical challenges of managing CIS compliance.
Our services include: CIS Process Reviews
We assess your existing CIS procedures, subcontractor onboarding processes and internal controls, identifying weaknesses before they become costly compliance issues.
Monthly CIS Returns
We prepare and submit your monthly CIS returns, including NIL returns where required, carry out subcontractor verification and provide all required CIS deduction statements.
Construction Bookkeeping & Accounting
Our specialist construction bookkeeping service ensures your CIS records, payroll, VAT and financial reporting remain accurate, compliant and up to date.
Technology Implementation
We help construction businesses implement and optimise cloud accounting systems that streamline CIS administration, automate reporting and improve overall financial visibility.
Final Thoughts
The April 2026 CIS reforms represent one of the most significant compliance changes for the construction industry in recent years. While the new rules increase administrative responsibilities, they also provide an opportunity for businesses to strengthen their processes, improve financial controls and reduce compliance risk.
By reviewing your subcontractor management procedures, maintaining accurate records and adopting efficient digital systems, your business will be better positioned to meet HMRC's expectations and avoid costly penalties.
Need Specialist CIS Support?
Whether you need help with CIS returns, subcontractor verification, bookkeeping, payroll or construction accounting, Vau Consult is here to help.
Contact Vau Consult today to discuss how we can help your construction business stay compliant, reduce risk and focus on delivering successful projects.
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