IRS changed status from married filing joint to single form 4549

[cipparulo12345]

I filed a return married filing joint. Spouse told me her SS# but it was incorrect. The IRS changed the filing status of the taxpayer from married to single.
He is a contractor and when they changed his status for single they did not allow any of his deductions so his balance due is enormous. They sent a form 4549.
Is this an easy fix and how should I go about it?

[Anarchrist]

Are they legally married?
Was the return audited?
What does the 4549 say to do if you disagree?
Does the 4549 state why the deductions were disallowed?

[New York Enrolled Agent]

Are they legally married?
Was the return audited?
What does the 4549 say what to do if you disagree?
Does the 4549 state why the deductions were disallowed?

Follow up to Anarchrist - there sounds like there is a lot more to this story.

The IRS changed the filing status of the taxpayer from married to single. Was there an SFR involved in this case?

[spanel]

Has to be alot more this this story...

Did you efile the return?? The IRS does not accept returns with incorrect Socials... usually mailed either.

Chris