1. Make sure you look at your prior year IL-1040 (not Federal 1040), line 11 and take note of that number.
2. Make sure your prior year IL-1040 was e-filed or if it was printed, make sure it was mailed in that tax year for IRS to process it.
If either statement in line 2 above is true, then you will use the IL-1040, line 11 number as your IL AGI.
If either statement in line 2 above is false and there is a chance IL never received and processed that year's return, then zero will be your AGI for the prior year.
To enter the IL AGI in your online TurboTax screen, go to the FILE section of your return which is the last section of the process. Just as there is a place to enter your Federal AGI, there will be a place to enter the IL AGI.
