IR35 Consultancy & Specialist Advice

Specialist IR35 advice for companies serious about HMRC compliance.

Award-winning IR35 consultancy combining employment-status experts with technology HMRC respects. We help UK businesses identify risk, fix it, and prove it — before an enquiry lands.

Status reviews, audits & SDS support
Policy, training & governance
Investigation & defence support
Free 30-minute consultation, reply within 1 working day

Speak to an IR35 specialist

Tell us a little about your business and we'll be in touch within one working day to arrange your free consultation.

Trusted by leading UK organisations

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RS Group logo
Aston Martin logo
Take2 logo
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Royal Yachting Association logo
Quint Group logo
Thredd logo
RS Group logo
Aston Martin logo
Take2 logo
Commvault logo
Dementia UK logo
Royal Yachting Association logo
Why IR35 advice, why now

HMRC doesn't care about your policy. They care about your practice — and whether you can prove it.

Most boards only discover their IR35 exposure when an enquiry lands. By then it's too late to fix the evidence trail. These are the questions a Head of Tax can rarely answer cleanly:

  • “HR doesn't know about workers coming through procurement.”
  • “Managers answer CEST questions to get the outcome they want.”
  • “People leave and we lose all the documentation.”
  • “The Revenue want to see it in practice, not just policy.”

The cost of getting it wrong

HMRC penalties stack on top of the underlying tax and interest, and can be assessed across multiple years.

0–30%

Careless error

Failure to take reasonable care over status decisions.

20–70%

Deliberate error

Status decisions HMRC believes were knowingly incorrect.

30–100%

Deliberate & concealed

Errors hidden through false records or misleading evidence.

IR35 consultancy services

Specialist support across the IR35 lifecycle

From a single status review to full programme support — scoped to your sector, your contractor footprint, and the level of HMRC scrutiny you're facing.

Status reviews & SDS

Defensible Status Determination Statements for every contractor, service-provider and SoW engagement — with the evidence trail HMRC expects.

IR35 audits & gap analysis

Independent, expert-led audit of your IR35 posture. Quantified exposure, governance gaps, and a prioritised remediation roadmap.

Policy, training & governance

Hiring-manager training, IR35 policy authoring, and ongoing governance support so practice matches your policy on day one and at year three.

Investigation & defence support

If HMRC opens an enquiry, we work alongside your tax and legal teams — preparing documentation, responses, and an evidence pack that holds up under scrutiny.

How it works

A clear path from first call to compliance

No-obligation discovery call. Fixed-scope engagements. Outputs your board, your auditor, and HMRC will all recognise.

01

Discovery call

Free 30-minute call with an IR35 specialist. We listen, you brief us on contractor footprint, current controls, and what's prompting this.

02

Scoped assessment

We propose a fixed-scope engagement — from a targeted status review through to a full IR35 audit — with a clear deliverable and timeline.

03

Findings & roadmap

You receive an evidence-based report with quantified exposure and a prioritised remediation plan. Optional ongoing support keeps practice matched to policy.

Why CoComply

Specialist expertise meets technology HMRC respects

The combination most consultancies can't offer: deep employment-status expertise plus the platform that makes evidence repeatable.

Employment-status experts

Deep IR35 and workforce-compliance experience across financial services, manufacturing, higher education, charities, and more.

Technology HMRC respects

Our award-winning RegTech platform scales the analysis — but never replaces the human judgement HMRC expects and requires.

Award-winning RegTech

Trusted by leading UK enterprises. Recognised for accuracy, defensibility, and audit-ready documentation.

Track record of turning risk into assurance

From boardroom briefings to live HMRC enquiries, we've helped organisations of every size move from exposure to evidenced compliance.

Frequently asked

IR35 consultancy questions, answered

Ready to talk to an IR35 specialist?

Free 30-minute consultation. No sales pitch — just a clear, expert read on where your IR35 risk sits and what a sensible next step looks like. We'll be in touch within one working day.