Beyond CIS / bespoke builds
Some tax risks have no off-the-shelf defence. We build the tool.
CIS Defence exists because one liability was worth a purpose-built evidence system. If your business carries a compliance risk that no available software handles properly, we design and build the defence for it: the same people, the same method, the same standard of record.
The method / liability first
We start with the liability, not the features.
Every build begins with three questions. What would HMRC ask? What evidence would answer it? And what has to be recorded, by whom and when, for that evidence to hold?
The build follows the answers. Our tax specialists define the checks, our engineers automate them, and the output is always the same kind of artefact CIS Defence produces: a documented, timestamped record your business can stand behind when the enquiry letter arrives.
On the record / built to date
Two builds, two liabilities.
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Employment status, at scale
IR35 / CEST-aligned
A sector-specific questionnaire for businesses with complex contractor arrangements who need to make and document status determinations at scale. Each determination is captured with its supporting rationale, aligned with CEST methodology and case law, and exported as an audit-ready record for enquiry defence.
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Expense risk, before submission
Document analysis
AI-assisted review of expenses and invoices that flags tax risk before it reaches a return: categorisation against the legislation, a written rationale referencing HMRC guidance for every flagged item, and summary reporting for review and sign-off.
BOTH TOOLS CAN BE MADE AVAILABLE TO CLIENTS ON REQUEST.
Tell us the risk.
Describe the compliance challenge and we will tell you honestly whether a bespoke build is the right answer, or whether something that already exists would serve you better.