How can I compare Married Filing Jointly with Married Filing Separately?

If you're using TurboTax Desktop, try this:

1. Open your return and select Forms.
2. Select Open Form, enter What-If Worksheet (it may appear as What-If Wks), and select Open Form.
3. Select the MFJ vs. MFS box.
4. Scroll down to Balance Due (Refund) located under Line 72.
5. The second column shows the federal outcome for a joint return, and the third and fourth columns show the outcome for the taxpayer and spouse if filing separately.
   • Negative numbers are refunds and positive numbers are taxes due.