Generally, your tax debt incurred before getting married remains your separate debt. Your fiance's home is her home alone and as long as she keeps it that way it should not be reachable by the IRS even after you get married. That said, calculating how much you have "available" to pay tax with might take into account the fact that you seem to have no rent or mortgage payment. Her income may also be used to calculate how much you have "available" even if her income usually isn't used to pay taxes with.
I hope this helps.
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I agree with the other attorneys, and have a couple of suggestions. You should keep your bank accounts separate at least until all back taxes are paid off, and you will want to file married but separate tax returns. The idea is to maintain a separation of your financial resources and obligations until the tax debt is erased. Of course, you will also want to keep up with the payment plan. Good luck.
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