[ukoki]

Mixing inside and outside contracts can be quite tax efficient but requires being diligent. For example, an inside IR35 contract that partially spans two tax years can be used to take the "reasonably cheap" first 50k of salary of each year, with any extra put in a SIPP. Then, outside contracts in the same tax years are used just to accumulate money in a limited company with a view to withdraw funds via BADR at some point, and potentially used to top up the SIPP as well.

[harel]

Interesting approach. My personal case is more complicated but this is still interesting. As an aside, my accountant raises a point that mixing might raise some flags with HMRC regarding status.

[ukoki]

Working with a different statuses for the same client should definitely be avoided as HMRC will be sceptical that the working practices are actually different between contracts. Working differnent statuses for different clients shouldn't be an issue IMHO