Umberella company offering increased take home under IR35

[randomname]

I have been approached by an Umberella Company saying that they can increase my weekly take home by almost 50%. I'm on a contract inside IR35 and on questioning him it seems like he is asking me to pay tax,Ni etc only on National Minimum wage and the rest will be a non-assured income and hence cannot be taxed .
Has anyone come across this before ? Any warning signals going up? I dont want to end up with a massive tax bill from HMRC .

[NotAllThere]

Wrong forum. I've started a new thread in the right forum, here: https://forums.contractoruk.com/umbr...er-ir35-a.html

This thread locked.