I got the $6,000.00 amount off of the State of Alabama Department of Revenue site.
http://www.ador.state.al.us/incometax/itfaq01.htm
But, I will call my husband's accountant to double check the info and make sure I am intrepreting it correctly.
That is regarding taxes due to the state. The federal income tax code is not the same as what state's set for themselves.
Plus, if you file jointly with your husband, all income is counted together. Say he earns $100 and you earn $4. The total income is $104. Not his $100 and you don't have to report.
Your accountant and attorney can help protect you in the business venture.