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  4. How often should I have an IR35 Status Assessment?
  1. Home
  2. IR35 FAQ's
  3. How often should I have an IR35 Status Assessment?

How often should I have an IR35 Status Assessment?

IR35 status assessments are required every time you engage with a new contract or make a change to your contract. But we recommend undertaking an independent IR35 status assessment through Brookson Legal if you disagree with your end hirers process and outcome.


IR35 assessments are only required at the start of a contracted assignment. If your working relationship doesn’t change from that point, then your SDS will remain valid for as long as you need it to.

However, if you disagree with your end hirers decision as outlined in your SDS, you are entitled to undertake an independent IR35 in order to challenge it. Brookson Legal can support you when engaging with your end hirer and will undertake an IR35 review if required.

The outcome of your challenge – whatever it may be – will then stand for the foreseeable future. You won’t need another IR35 status assessment with that end hirer unless your contracted work changes in some way.  

Updated on 1st April 2020

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