As a contractor, you are responsible for both employee and employer portions of FICA and Medicare; so you are on the hook for 15.3% SE tax when it would normally be 7.65% withheld from your paycheck. So now your apples to apples salary is $96,044. You also do not get benefits, or paid time off as a contractor. You are supposed to provide your own supplies, but you can ask your client to reimburse you. Will you have to travel?
Why is the position considered contractor? Business Analyst seems like it would lend itself to being an employee situation.