Is my spouse responsible to pay a portion of federal taxes. We filed married filing jointly
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Many married taxpayers choose to file a joint tax return because of certain benefits this filing status allows. Both taxpayers are jointly and severally liable for the tax and any additions to tax, interest, or penalties that arise as a result of the joint return even if they later divorce. Joint and several liability means that each taxpayer is legally responsible for the entire liability. Thus, both spouses are generally held responsible for all the tax due even if one spouse earned all the income or claimed improper deductions or credits. This is also true even if a divorce decree states that a former spouse will be responsible for any amounts due on previously filed joint returns.
So far - if you filed jointly your 2011 tax return - you both are liable - and the IRS will not divide your liability. The division of the liability would be a civil matter between you and your spouse - and may be part of your divorce or separation agreement.
Let me know if you need any help.