Is one of you claiming Head of Household? There are special rules
For MFS See pub 501 page 7 special rules # 11, and page 22 Persons not eligible for the Standard Deduction https://www.irs.gov/pub/irs-pdf/p501.pdf
The rule for MFS says you MUST Itemize if your spouse Itemized.
The rule for HOH says you do not have to Itemize if your spouse does.
The person filing HOH does not have to itemize unless they want to, BUT the person filing MFS MUST itemize if the HOH Spouse does.
