If you are a contractor with a limited company, IR35 has a way of resurfacing at exactly the wrong time: when a client changes policy, when a new engagement begins, when a status decision lands late or when you realise you’ve been operating under assumptions rather than paperwork.
JMK Group UK’s own IR35 guidance describes the off-payroll working rules and the principle behind them: where a worker provides services via a PSC, the rules ensure those who would have been an employee if engaged directly pay broadly the same Income Tax and NICs as employees.
The part contractors often miss: status decisions sit with the end client
Since April 2021 (private sector), end clients decide IR35 status and communicate their decision via a Status Determination Statement (SDS). It also references the HMRC CEST tool used by many end clients to make status decisions.
Contractors can appeal, but the more practical question is: what do you do next if an engagement is inside IR35?
“Inside IR35” doesn’t end contracting but it can change the best payroll route
We explain that where IR35 applies, tax and NICs must be deducted, and this can often result in the worker using an umbrella company to ensure compliance.
That is the reality behind one of the most searched phrases in the market: “inside IR35 umbrella”.
The JMK Group UK solution contractors actually want, flexibility without gambling on compliance
JMK Group UK’s answer is PSC Flex, a solution designed for contractors with their own limited company/PSC who want to keep taking contracts of their choice. JMK Group UK lists PSC Flex features including:
- Free upgrade to PSC Flex
- Ability to switch between Limited Company & Umbrella
- No restrictions on the number of times contractors switch
- End-to-end solution with IR35 guidance and support
- Contractors retain a dedicated accountant
- End-of-year accounts and self-assessments included
That matters because most contractor stress comes from being forced into a single “one size fits all” arrangement. Flexibility done properly is what keeps contracting workable across changing engagements.
Compliance isn’t just IR35: SDC and CIS sit in the same world
On our CIS page, contractors are taken through an SDC questionnaire to determine if they can be paid via CIS; if they fail SDC, JMK Group UK offers the Umbrella PAYE method. This is exactly where many contractors slip: they assume CIS is simply “construction = CIS”, without recognising that working practices and control tests matter.
On JMK Group UK’s compliance page, it also references broader risks such as MSC’s and transfer of debt legislation, positioning its payroll services as removing “IR35 headaches” by employing workers and reducing liability/risk.
The point: the “best” option is the one that fits the engagement and keeps you safe
Contractors don’t need jargon. They need a clean answer:
- What’s the right model for this contract?
- How do I switch if the next contract changes status?
- Who helps with accounts and self-assessment?
- How do I avoid nasty surprises later?
If you’re working through a PSC, facing inside/outside IR35 decisions, or need a compliant way to switch between limited company and umbrella PAYE, explore JMK Group UK’s PSC Flex:
Frequently Asked Questions
What does “inside IR35” mean for contractors?
It means the engagement is treated as employment-like for tax purposes, so PAYE-style deductions apply and many contractors use umbrella payroll to stay compliant.
Who decides my IR35 status?
In many engagements, the end client issues a Status Determination Statement (SDS).
Can I switch between umbrella and other setups between contracts?
Many contractors do, depending on status decisions and engagement type. The key is confirming the correct model per assignment.