Protect Your Construction Business From Supply Chain Fraud Liability
From 6 April 2026, HMRC can hold you personally liable for tax fraud anywhere in your supply chain — even if you didn't know about it. CIS Comply gives you the timestamped audit trail that proves you did everything required.
- 30%
- Penalty on lost tax
- £100
- Per missed nil return
- 5 yrs
- GPS reapplication bar
- 12
- HMRC checkpoints logged
How it works
Audit-ready in three steps
No spreadsheets. No paper trails. No guessing what HMRC wants to see.
1. Add your subcontractors
Import or add each subbie in under a minute. We pre-fill HMRC verification fields and CIS status automatically.
2. Log your 12-point checks
Tick each HMRC-recommended due diligence step. Every action is timestamped, signed, and locked into your audit trail.
3. Export your evidence pack
Generate a one-click PDF audit report at any time — formatted exactly how HMRC investigators expect to see it.
Features
Everything you need to prove you did your due diligence
12-Point Due Diligence Log
Log every HMRC-specified check. Timestamped. Immutable. Built to survive investigation.
Compliance Dashboard
Traffic-light risk scores. GPS monitoring. Nil return countdowns. Everything at a glance.
One-Click Audit Report PDF
Generate a professional evidence pack in seconds. Formatted for HMRC investigation. Email directly to your accountant.
Nil Return Reminders
Automatic monthly reminders so you never miss a return — and never trigger an automatic £100 penalty.
GPS Cancellation Alerts
Get notified the moment a subcontractor's Gross Payment Status changes, so you can act before HMRC does.
Immutable Audit Trail
Every check, every change, every document — cryptographically logged and stored on UK servers.
The 12-point check
The exact checklist HMRC expects you to run
HMRC's internal CIS manual sets a clear bar: a contractor who can demonstrate they did everything reasonable to check their supply chain is unlikely to meet the "knew or should have known" threshold. CIS Comply walks you through each step.
- Right-to-work verified
- CSCS cards checked
- Employer's liability insurance
- HMRC deliberate defaulters list
- Bank account matches business name
- Commercial pricing review
- Formal contract in place
- Director construction experience
- Companies House director check
- Supply chain depth assessed
- Payment terms reviewed
- No sudden company changes
From the trade
Built with UK contractors, for UK contractors
"We replaced a tangle of spreadsheets with CIS Comply in an afternoon. When our accountant asked for evidence, I exported the PDF in one click."
"The nil-return reminders alone are worth it. We've never missed a filing since switching, and the audit log is exactly what HMRC wants to see."
"Simple, fast, and built specifically for the April 2026 rules. It just does the job — no fluff."
FAQ
Common questions
What is the CIS 'knew or should have known' rule?+
From 6 April 2026, HMRC can hold contractors liable for lost tax if they knew or should have known fraud was occurring in their supply chain — under sections 62A–62B of the Finance Act 2004 as amended by the Finance Act 2026.
Do I need to file a nil return every month from April 2026?+
Yes. Contractors must file a monthly CIS return or pre-notify HMRC of inactivity — even in months with no subcontractor payments. Missing a nil return triggers an automatic £100 penalty.
Can CIS Comply file my CIS return with HMRC?+
No. CIS Comply is a record-keeping tool. You file returns via HMRC's CIS online service or HMRC-approved commercial software — we generate the audit evidence that backs them up.
How does CIS Comply protect me from HMRC investigation?+
We create a timestamped, immutable audit trail of every check, verification, and action. HMRC's internal manual says a contractor who can demonstrate genuine due diligence is unlikely to meet the 'knew or should have known' threshold.
What happens if a subcontractor loses Gross Payment Status?+
Under April 2026 rules, HMRC can cancel GPS immediately if fraud is detected, with a 5-year reapplication bar. CIS Comply flags GPS changes and review dates so you can act proactively.
The April 2026 rules are already in force.
Every day without a logged audit trail is a day of unprotected liability. Start your free account in under two minutes — no card required.