@RW26 --
If you file a joint return, you will be held jointly liable for any back federal taxes your wife might owe. If you do not wish to be held liable for tax debts that she might owe, you would file for "Injured Spouse" relief. TurboTax has a help article on this:
https://turbotax.intuit.com/tax-tips/marriage/what-is-irs-form-8379-injured-spouse-allocation/L7tsrx...
Your wife should file a new Form W4-P with DFAS as soon as possible, so that the correct amount is withheld from her future pension payments. Here's a link to that form, with instructions:
https://www.irs.gov/pub/irs-pdf/fw4p.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
