Senate Budget Committee staff members hand out copies of the Obama Administration's proposed FY 2014 federal budget in the Dirksen Senate Office Building on Capitol Hill.

The president's proposed budget would cap IRAs and other retirement plans at $3 million, but it could fall below that in future years.

It's not easy to get more than $3 million in a retirement account, which includes IRAs, 401(k) and 403(b) plans. Currently, the cap would affect just 0.03% of retirement accounts, says the Employee Benefit Research Institute.