Can tax exempt income qualify as support?

Need more info to answer properly, but if I understand what you're asking: Income that is not subject to income taxes (tax exempt investments, inheritance income from an estate, life insurance proceeds, etc) can certainly be considered income to support oneself - (IE If someone asks how you support yourself when you have no job... you may have income sources that are tax exempt that provide you with enough income to live a very comfortable lifestyle.) If you're asking for purposes of support as in child support or spousal support - then I believe that is negotiable prior to settlement of the divorce / child support case. If you're asking if tax exempt income qualifies as income for a dependecy exeption, then the answer is yes. So long as the income is enough to cover 50% of the expenses to maintain the household / provide for the child, etc.