Amending from MFJ to MFS Paid tax due What to do if over paid

Filed jointly and paid taxes due for tax year 2018 using my SS# as the primary.  The spouse was responsible for all of the taxes due because payroll withholding was too low.  I want to amend the return to MFS.  The 2018 tax due on my SS# was $0.  Can I request or will the IRS reimburse or refund that over payment with an amended return?   
Basically looking to start over as we both want to file MFS.