CIS Returns

The ARKK Automation Platform automates the end-to-end Construction Industry Scheme (CIS) process for contractors, aggregating subcontractor payment and deduction data from any source, verifying subcontractor status, and calculating deductions owed each month. Built-in machine learning checks every transaction for errors before submission to HMRC.

Contractors still relying on spreadsheets or manual processes for CIS face avoidable risk. Manual processes are prone to error, slow to scale across large subcontractor volumes, and leave contractors exposed to penalties for late, missing, or incorrect monthly returns.

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Save time

Subcontractor deductions are calculated automatically each month, cutting the manual workload of preparing your CIS return.

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Maximise value

One source-agnostic platform ingests your data once and reuses it across CIS and other reporting obligations, with unlimited users.

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Mitigate risk

The Platform is ISO 27001-certified, with built-in validations that catch calculation errors before submission, giving every CIS return a secure, auditable trail.

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Gain visibility

A single dashboard gives you a real-time view of subcontractor status and deduction accuracy, so nothing slips through before the deadline.

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Stay compliant

Verification checks and deduction rates are kept current as HMRC requirements change, so your return stays aligned with the latest rules.

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Plan ahead

Continuous oversight replaces the monthly scramble, giving your team confidence ahead of the 19th of each month deadline.

The information that came back from ARKK was so clear and transparent.

Kreeson Thatiha, Head of Finance and Client Money, eToro

I was continually reassured of ARKK's technology and their commitment to customer service.

Darryl Alford, Finance Manager, DPD

ARKK were prepared to be more flexible with how we worked and how we were set up.

Alistair McClelland, Head of Tax, The University of Edinburgh

Simply outstanding service and a real pleasure to work with.

Chris Parsons, Production Director, Radley Yeldar

ARKK are extremely responsive and supportive partners.

Janette Moriarty, Group Financial Reporting Director, Kerry Group

ARKK are invaluable to us… I wouldn't consider another project without them.

Valentin Ramousse, Head of International Business Development & Partner, Emperor Works

The speed and accuracy of implementation was incredible.

Akash Kalaiya, EMEA Tax Manager, Universal Weather and Aviation

+ What is CIS?

CIS (Construction Industry Scheme) is a UK tax scheme requiring contractors to deduct money from a subcontractor's payments and pass it to HMRC as an advance payment towards the subcontractor's tax and National Insurance. Contractors must verify each subcontractor's status with HMRC and submit a monthly return detailing payments and deductions made. Deductions are typically 20% for registered subcontractors, 30% for unregistered ones, and 0% for those with gross payment status.

+ How does ARKK automate CIS compliance?

ARKK's Automation Platform verifies subcontractor status, calculates deductions owed based on each subcontractor's rate, and files a submission-ready return directly with HMRC. Built-in machine learning checks every transaction for errors before submission, and the platform maintains a full audit trail across every return.

+ How long does it take to implement ARKK's CIS solution?

The ARKK Automation Platform is designed to be operational in weeks, not months. The modular structure means implementation scope is defined by what you need, so contractors that require only part of the process can go live faster than those implementing the full end-to-end solution. Your dedicated Customer Success team provides guidance throughout onboarding and extended support around monthly deadlines.

+ Does ARKK integrate with existing ERP and data systems?

Yes. The ARKK platform is source-agnostic, meaning it connects to data from any system, whether that is an ERP, payroll system, or spreadsheet-based process. Data is ingested once and reused across multiple reporting processes without limits on volume or complexity.

+ How is data secured on the ARKK platform?

ARKK software is ISO 27001 certified, the internationally recognised standard for information security management. The platform includes customisable workflows, defined team roles, and built-in validations, ensuring that access controls and data integrity are maintained throughout the reporting lifecycle.

+ What are risks of managing CIS returns manually?

Contractors still relying on spreadsheets or manual processes face avoidable risk. Manual verification and calculation are prone to error, slow to scale across large subcontractor volumes, and can result in penalties for late, missing, or incorrect monthly returns, since CIS returns are due by the 19th of each month.

How ARKK automates CIS returns

Aggregate

Calculate

File

Govern

How the ARKK Automation Platform works