Unless the direct rollover is from a traditional account in a qualified retirement account to a Roth account, the taxable amount inbox 2a of the Form 1099-R will be $0 and the rollover will not add to taxable income. It's income in the sense that it is reportable on the tax return, but If it does not add to taxable income, it does not affect anything on the tax return. Only taxable income adds to AGI that might affect one's eligibility for the stimulus.
