Instead of using the Married Filing Separately status, please consider filing as Married Filing Joint and making use of the "Injured / Innocent Spouse" Form 8379, which can be found in the TurboTax software on the Federal tab for Other Tax Situations. Married filing separately is the worst of the filing statuses, because you lose almost all tax credits and you are forced to both itemize or both take the standard deduction.
When the page opens, scroll down to the bottom and select the very last item, Miscellaneous Tax Forms. When the list of miscellaneous forms opens up, look for "Report an injured or innocent spouse claim". As you work through the form be sure you only answer the Injured Spouse questions (not the Innocent Spouse questions).
There are a few questions you need to answer in the opening section and then you will need to click through several pages of Innocent Spouse questions before you get to the Injured Spouse section.
