Your personal state taxes will not be affected if you do not earn any money in MS. If you are going to file jointly, it's a little more paperwork when he does his MS state taxes to show that your portion of the income is not taxable in MS but not very hard to do.
If you were to get married in 2007, you can file your 2007 federal taxes however you wish: single, married filing jointly, or married filing separately. You will usually have to file your state taxes the same way.
With your income being so low, it would just be easier to get a few 1040's and do the calculations for each filing scenario to see what is more beneficial to you on the federal side. You could use both of your 2006 taxes as a baseline and add your incomes together to see if you would save money by filing jointly.
Your withholding rate is going to be the main factor. If neither of you change your withholding rate once your married (you don't have to), then file jointly then you'll probably get a break at the end of the year. You'd have to know whether your small income would push your combined incomes into another tax bracket. If both of you start withholding as married, you'll pay less tax in out of every paycheck but your refund (if any) will be smaller. It's basically a question of do you want the govt to hold onto your money for you throughout the year and give more back or do you want to hold onto more of it and get less back.
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