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 That's up to you.  You are paying both halves of social security and medicare, and not getting statutory benefits like unemployment insurance.  On the other hand, they might want to pay you a lower salary if they classified you as an employee.

By the way, they can't legally provide you with tax-free health insurance if you are not an employee—anything they provide of value, including paid or partially paid insurance, must be included on the 1099-MISC as part of your taxable compensation. 

It sounds like you know that based on the rules, you should probably be an employee.https://www.irs.gov/businesses/small-businesses-self-employed/independent-contractor-self-employed-o...