I’m not sure what this has to do with taxing revenues vs profits. Regardless of whether you provide your services through a limited company and regardless of th

I’m not sure what this has to do with taxing revenues vs profits. Regardless of whether you provide your services through a limited company and regardless of the IR35 status of any particular contract you can always deduct business expenses from revenues before getting taxed. The purpose of IR35 is to stop people from avoiding national insurance contributions.