Background checks are usually related to confirming your education and past employment history and if you have any criminal history. Sometimes they want to know

Background checks are usually related to confirming your education and past employment history and if you have any criminal history. Sometimes they want to know your credit score too which can be a problem for those with a streak of bad luck financially. Yes you can deny disclosing your previous salary. Usually they will not ask for any official proof anyway so you could make it up or give your expectations.