Hello
As part of your application you will have show documented proof of work experience, proving that you did work at the firm for x number of years. Some business schools do ask for proof of income for the last 12 or 6 months as part of the application. This varies from school to school. Few business schools ask for this data for statistical purposes. You will also be required to show proof of your income at certain schools while applying for scholarships. If you are applying to business schools outside of the country, you will have to show proof of financial resources for visa purposes. In these three cases, you will only have to provide the required documentation after you have been offered admission.
I would suggest you to contact the admission division of individual schools to find out what their requirements are. If you tell me the schools you are applying to, I can let you know if they require this data or not.
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