To compare what your overall tax situation would be when filing MFJ vs MFS using TurboTax Online, you will need to create three accounts (you can do this all under the same email address but will have different usernames):
1. The first account will be married filing jointly with both you and your spouse's income.
2. The second account will be married filing separately with just your income.
3. The third account will be married filing separately with just your spouse's income.
You will then add the final results for the MFS returns and compare with the MFJ return.
