At Flexible Staffing we always advise our job seekers to walk into a client interview with two numbers in their mind: their desired salary and their least considered salary.
The least considered amount must be a salary that you are ready to accept and can live with, if it is offered. There are some really good jobs that shouldn’t be passed up, and, for whatever reason at the time, you simply cannot expect to negotiate more. Period.
Your desired salary should be exactly that. It must be within reason and commensurate with your skills and experience. It should be justifiable in relation to your least considered; don’t have too large of a gap between them. The closer your desired salary is to your least considered, the better chance you have of getting your desired salary.