Key takeaways
- Reasonable care is a process you can evidence, not a conclusion you reach.
- Blanket determinations are the most common failure we see.
- Keep the SDS, the reasoning and the dispute log together for six years.
IR35 exposure rarely arrives through a single bad decision. It builds up through determinations made quickly, documented thinly and never revisited when the working arrangement changes.
The checklist
- A Status Determination Statement issued for every engagement, to the worker and to any agency in the chain.
- Reasoning attached to each SDS, referencing control, substitution and mutuality of obligation as they actually operate.
- No role-level blanket determinations — assess the engagement, not the job title.
- A named owner for status disputes and a documented 45-day response process.
- A re-assessment trigger when a contract extends, the scope changes or the working pattern shifts.
- Records retained for six years, including the versions you superseded.
Where umbrella arrangements help and hurt
A compliant umbrella employer takes the worker inside their own PAYE and removes the status question for that engagement. It does not remove your duty to check the chain: debt transfer provisions mean an unpaid liability further down can land with you. Ask for the umbrella's audit accreditation, sample payslips showing statutory deductions and confirmation of how holiday pay is handled.
Every contractor payroll problem we have inherited came with a spreadsheet of determinations and no reasoning column.
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