[header] How to make a job offer to prospective candidates [title] Ask about the candidate's prior and expected income. [step] You need to be sure that any candidate you interview might be in a position to accept your job. An important piece of information you need to gather is how much the candidate has made in previous jobs. 
You could put a question on a written application asking the candidate to list their salary for their past three jobs. [substeps] You should also consider the differences in cost of living between the sites of the old job and new job, and also impact of state income taxes in each area.