Oh you should not do it that way. It probably won't work to compare them. You need to do 3 returns starting each one from scratch. One Joint and 2 more returns for Separate each person. Do not just change things around.
How to Compare Joint to Married Filing Separately
https://ttlc.intuit.com/community/married/help/how-can-we-compare-married-filing-jointly-with-marrie...
