I think you're referring to Adjusted Gross Income (AGI). You can find the AGI for last year's taxes in the following places:
- Last year's return: Line 11 on your 1040 from last year
- If you e-filed last year's return with TurboTax and also printed your return to PDF, the AGI is also shown on the Electronic Filing Instructions (the first page of the printout), in the Federal Tax Return Summary section
