I can see how £4.5k increase sounds tempting, but I don't think it will be worth it unless there are other reasons you are moving. And what probably makes it worse is that a year ago as a C1 you would have been on £42.5k. But if you look at it that way, then Deloitte is also paying you less than ACN would have a year ago. Deloitte is currently taking huge numbers of ACN consultants, probably by paying them all a bit more. But I can't see why they would be able to pay continuously more over the next 5-6 years. Also, bear in mind that ACN is currently finalising the details of a pay adjustment. And if you do perform well at Accenture, it is very possible to make manager 6-12 months early. I've seen it happen. Whatever else is bad about Accenture, you do have the opportunity for fast career progression. If you're unhappy with your role, your project, your colleagues, your alignment etc. at Accenture then speak to your CC and tell them frankly: "I want to change role/project etc., and I'm considering leaving." The attrition rates are currently so high they will bend over backwards to make you happy here. Why should things be so different at Deloitte?