Salary questions should always be deterred until an offer is on the table. So if a potential employer asks you how much money are you looking to make, what kind of salary are you looking for, the worst question and always a red flag for an applicant is, "What is your bottom line?" or ,"What is the lowest salary you are willing to accept?" If you ever hear that question, that is the major clue to turn down this company and just leave because they are strictly bottom line oriented.
And if you're not going to meet their minimum salary requirements, then they are going to hire somebody who will. So you want to make sure that any discussion of salary is talked about when there's an offer on the table because that's the only time you have to really leverage that situation. If you're asked, "How much money are you looking for?" your response should be, "I am very very interested in this position. I'm sure we can come to a meeting of minds. I'm negotiable and flexible on salary. Let's table that discussion until you determine that I am one of the top two candidates."