Only a surviving spouse who rolls over an inherited Roth IRA can treat the account as his/her own and make contributions to it. A non-spouse beneficiary who wants to contribute to a Roth IRA must set up a separate account.
Gross income less allowable adjustments, such as IRA, alimony, and Keogh deductions. AGI determines whether various tax benefits are phased out, such as personal exemptions, itemized deductions, and the rental loss allowance and modified adjusted gross income (MAGI).