Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Does it make sense to buy a house in my situation?
The $3K includes property tax, right? It looks like the mortgage alone will be about $2150 or so. If your (cal) state tax is enough to put you into itemized deductions, your mortgage and property tax are a write off, and the $3k will actually be closer to the $2K you are considering for rent.  The wild card as I see it is that your budget is so tight that any unforeseen expenses will be charged. As a long time homeowner, I know these expenses sometime appear to be high, and regular, despite their random nature. The money earmarked for credit card payments will go a long way to cover the tight budget you seem to have. This and your decreasing support makes this look tight but not impossible. The condition of the house would make or break the deal, in my opinion.