Best CIS Software for Contractors UK 2026
The Construction Industry Scheme (CIS) adds a layer of complexity to the financial lives of contractors and subcontractors in the UK. If you are a contractor who pays subcontractors, you must verify them with HMRC, deduct the correct percentage from their payments, file monthly returns, and keep detailed records. If you are a subcontractor, you need to track CIS deductions and reclaim them through your self-assessment or corporation tax return.
Getting CIS wrong can result in penalties, incorrect deductions, and strained relationships with your subcontractors. The right software handles the calculations, submissions, and record-keeping, leaving you free to focus on the job at hand. In this guide, we review the best CIS software for UK contractors in 2026.
Understanding CIS Requirements
Before evaluating software, it is important to understand what CIS demands. Under the scheme, contractors must deduct 20% from payments to registered subcontractors and 30% from unregistered subcontractors. Subcontractors with gross payment status receive payments without deductions.
Contractors must verify each subcontractor with HMRC before making their first payment, and periodically thereafter. Monthly CIS returns must be submitted to HMRC by the 19th of each month, detailing all payments made and deductions taken. Failure to submit on time results in penalties starting at £100 and escalating for continued non-compliance.
Subcontractors, on the other hand, need to track the deductions made from their payments and claim them back when filing their tax returns. This requires accurate records of every payment and deduction received.
For a deeper understanding of how CIS works, read our Making Tax Digital complete guide which covers how digital requirements affect CIS.
The Best CIS Software for UK Contractors
Accounted
Accounted handles CIS as part of its integrated accounting platform. For subcontractors, it tracks CIS deductions against income and ensures they are correctly accounted for when calculating your self-assessment liability. Penny, the AI bookkeeper, understands the nuances of CIS and can answer questions about deduction rates, verification, and reporting.
For sole trader subcontractors, Accounted is particularly valuable because it combines CIS tracking with broader self-employment accounting — expenses, VAT, MTD quarterly submissions, and tax filing are all handled in one place. There is no need for a separate CIS tool.
Accounted's pricing includes CIS support at no extra charge. Check our pricing page for current plans.
Xero
Xero offers CIS features within its accounting platform. Contractors can verify subcontractors, calculate deductions, and file monthly CIS returns to HMRC directly from Xero. The system tracks verified subcontractors and applies the correct deduction rate automatically.
For subcontractors using Xero, CIS deductions are recorded against income and flow through to the relevant tax calculations. Xero also handles the domestic reverse charge for VAT in construction, which interacts with CIS.
The CIS features are available on Xero's Standard and Premium plans, adding to the already significant cost of the platform. For contractors managing multiple subcontractors, the automation justifies the price. For sole trader subcontractors, the cost may be disproportionate. Our Accounted vs Xero page has a full pricing breakdown.
Sage Accounting
Sage has long been a staple in the construction industry, and its CIS features reflect this heritage. Sage Accounting handles subcontractor verification, deduction calculations, and monthly return filing. The platform supports gross payment status tracking and provides detailed CIS reports.
According to HMRC's CIS overview, contractors must keep records of all payments and deductions for at least three years. Sage's record-keeping features meet this requirement comprehensively.
Sage's CIS implementation is robust but can be complex to set up, particularly for contractors new to the scheme. The interface requires some familiarity with CIS terminology and processes. For established construction businesses, this is fine. For newcomers, the learning curve can be steep.
See our Sage vs Xero vs Accounted comparison for a broader look at how these platforms differ.
FreeAgent
FreeAgent includes CIS support aimed at subcontractors. It tracks CIS deductions on income and accounts for them when calculating self-assessment tax liabilities. The platform also handles the CIS-related aspects of VAT, including the reverse charge.
For contractors who pay subcontractors, FreeAgent's CIS features are more limited. Monthly return filing is supported but the subcontractor verification process is less automated than in Xero or Sage. If you are primarily a contractor managing multiple subcontractors, FreeAgent may not be sufficient.
FreeAgent's CIS features are included in the standard subscription, making it cost-effective for subcontractors who also need general accounting. For a comparison of how it measures up to other options, read our FreeAgent vs Xero vs Accounted guide.
BrightPay
BrightPay is primarily a payroll solution, but it includes strong CIS functionality. It handles subcontractor verification, deduction calculations, and monthly return filing. The integration with BrightPay's payroll features means contractors who employ both regular employees and subcontractors can manage everything in one system.
BrightPay's flat-rate annual pricing makes it cost-effective for contractors with many subcontractors. The CIS features are well-implemented and regularly updated to reflect HMRC changes.
QuickBooks
QuickBooks handles CIS for both contractors and subcontractors. Contractors can track subcontractor payments, calculate deductions, and file monthly returns. Subcontractors can record CIS deductions against income and track amounts available for reclaim.
The CIS features in QuickBooks are adequate for straightforward situations but can become cumbersome for complex arrangements. Contractors with high volumes of subcontractor payments may find the workflow slower than specialist tools.
CIS Contractor Solutions by IRIS
IRIS offers a dedicated CIS solution aimed at contractors in the construction industry. It handles the full CIS workflow from subcontractor verification through to monthly return submission. The software integrates with IRIS's broader payroll and accounting products.
IRIS CIS is more specialist than the general accounting platforms listed above, making it suitable for larger contractors with complex CIS requirements. Pricing reflects this, and it may be more than small contractors need.
Features That Matter for CIS Software
When comparing CIS software, prioritise these capabilities:
Subcontractor verification — The software should verify subcontractors directly with HMRC and store the verification status, including the applicable deduction rate.
Automatic deduction calculation — Based on the verified deduction rate, the software should calculate the correct amount to deduct from each payment.
Monthly return filing — Filing CIS returns to HMRC by the 19th of each month should be straightforward and ideally automated.
Materials handling — CIS deductions apply only to the labour element of payments, not materials. The software should allow you to separate these components correctly.
Domestic reverse charge VAT — For VAT-registered contractors and subcontractors, the domestic reverse charge applies to most CIS-qualifying services. Your software must handle this correctly.
Deduction tracking for subcontractors — Subcontractors need clear records of all deductions for their tax returns. The software should maintain a running total.
The ICAEW's CIS resources provide detailed technical guidance on how the scheme operates, which can help you understand what your software needs to handle.
CIS Mistakes to Avoid
Even with good software, these common mistakes can cause problems:
Not verifying subcontractors before first payment. Verification is mandatory. Paying without verifying means you must deduct at the higher 30% rate.
Incorrectly classifying materials. Only the labour portion of a payment is subject to CIS deductions. Overstating materials to reduce deductions is fraud. Understating them overcharges your subcontractor.
Late monthly returns. Penalties start at £100 for the first month and escalate. Set reminders or use software that alerts you before the deadline.
Not keeping adequate records. HMRC can request detailed records of all CIS transactions. Ensure your software retains payment statements, verification records, and monthly return copies.
Ignoring gross payment status reviews. Subcontractors with gross payment status must continue to meet the qualifying conditions. HMRC periodically reviews this status, and it can be revoked if conditions are not met.
Our Recommendation
For sole trader subcontractors, Accounted provides the simplest and most cost-effective CIS solution. CIS tracking is integrated with your broader accounting and tax management, and Penny ensures nothing is missed.
For contractors paying subcontractors, Xero or Sage offer the most comprehensive CIS features, including automated verification and monthly return filing. The choice between them often depends on which platform you or your accountant already use.
For large contractors with complex CIS arrangements, a specialist tool like IRIS CIS may be worth the investment.
Whatever your role in the construction industry, getting CIS right protects you from penalties and maintains good relationships with the people you work with. Explore how Accounted handles CIS and simplify your construction accounting.
Useful Resources
See how Accounted compares to Xero, Sage, QuickBooks and more — and why sole traders are switching. See the full comparison →
Editorial & Research
The Accounted editorial team covers software comparisons, technology, and the tools UK sole traders need to run their businesses efficiently. All software comparisons are based on independent research and publicly available pricing.
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