I am filing for extension and I have tax document from 2017 that has combined AGI for me and my wife. While doing extension for 2018 what do I enter in my wife's AGI?

[Rachel_W]

Because you filed jointly, you should use the exact same AGI amount for you and your spouse.

Your AGI can be found on your 2017 Tax Return:

If you filed a:

• 2017 Form 1040: your AGI can be found on line 37
• 2017 Form 1040A: your AGI can be found on line 21
• 2017 Form 1040 EZ: your AGI can be found on line 4