Taxpayer on the advice of his barber, decides to file MFS with TT and convinces spouse that this is the best option. Spouse comes in to have her taxes prepared and realizes this is a costly error.

 Question: They now agree that MFJ is best; am I able to amend without the spouse having to file her MFS return before amending? Do I enter this as additional correct information on the 1040-X? I just can’t seem to think this scenario though. My initial conclusion, spouse has to file so information is available for IRS to process 1040-X. Spouse’s tax liability on the MFS tax return would be approximately $2800. ..Thank you in advance for any insight.