If your spouse was claimed as a dependent on her parents' return, you can change your filing status in MY INFO to file married filing separately since you cannot file jointly. Go back in to MY INFO and make some changes. When it asks if you want to file with your spouse say NO---you have to do this before April 15. You will still include some information about your spouse because there are strict rules for filing MFS. Go through those MY INFO screens very slowly and very carefully.
If I am filing a separate return why do I have to list my spouse’s information on my return?
Even if you file separate returns (the worst way to file) you each have to list each other's SSN's and some other information on your own tax return. The IRS can then cross check to make sure you are not "double dipping" for itemized deductions, dependents, etc.
If you are in a community property state, there is more information that will be needed.
Community property states: AZ, CA, ID, LA, NV, NM, TX, WA, WI
https://ttlc.intuit.com/questions/1901162-married-filing-separately-in-community-property-states
https://turbotax.intuit.com/tax-tips/marriage/five-tax-tips-for-community-property-states/L4jG7cq7Z
Once you make the necessary changes to your filing status, try e-filing again. If it will not let you e-file, then file it by mail. Your TurboTax fee is the same whether you e-file or file it in an envelope.
If your spouse had any income to enter on a tax return she can also file married filing separately but must say on her own return that she can be claimed as someone else's dependent.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
