@ssam2020
If your spouse is not entirely forthcoming on their tax return, you are probably correct in filing separately.
There are several deductions and credits that are disallowed or reduced if MFS, and some other tax provisions that you can't take advantage of. But filing separately is still probably the right thing to do unless your spouse straightens out their finances. (Of course, no one can tell you this for sure except your own financial advisor or tax preparer whose advice you pay for and who understands all the confidential details of your situation.)
