Where you live and where you are taxed.
Many folks like to spend the cold winter months in Florida, or some other warm state, and return to northern climates for the summer. Many of these folks think that their tax status is determined by the number of days spent in each location and claim residency in the state where they spent the most time. This is not so.
Can't pay your income tax? Didn't pay enough in estimates or had too little withholding? Can't pay at all? Do you feel like you have to choose between the frying pan and the fire? You're not alone, and there are ways to settle up with the IRS.