Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why would you ever turn down a raise in salary?
The only valid reason from a financial point of view is if the raise is a promotion or comes with conditions that are unacceptable to you. You may not want added supervisory responsibilties, for example. You need to use discretion when refusing advancement though, at places where I have worked, declining a raise or promotion is seen as a career killer for some circumstances.