MAGI varies depending on what limitation it is being used for. It may be line 11 or it may not be. Use worksheet 2-1 in IRS PUB 590-A. then look at table 2-1 to see if your Roth IRA contribution must be reduced. if so use
worksheet 2-2 to figure the limitation
https://www.irs.gov/pub/irs-pdf/p590a.pdf
