I do not believe that you can be made liable for his debt to the IRS. Even after you are married, if you did not incur the debt and it was clearly pre marital, the IRS can not hold you responsibile. The caveat to this is if you file a Joint Return, and he owes back taxes, they may take the refund even if it is joint. So file individually until his debt is settled.
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The good news is that you do not marry into debt, so you will not be liable for these payments. On the other hand, if you are married filing jointly, the IRS may be able to offset your husband's tax claim against any tax refund to which you may be entitled, so that would be a backdoor way for the IRS to get at your money. You should verify this with an accountant or tax lawyer.
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In addition, your joint property can be seized to pay for the taxes. You would have to prove how much of it is yours. Keep accounts separate until this is worked out. You need to consult with a tax accountant to find out whether married filing separately will be better or if you will end up paying more taxes in the long run.
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