Roth IRA: Opportunities for Canada-U.S. Cross-Border Ties 1. Introduction of Roth IRAs: A Roth IRA is a tax-advantaged individual retirement account for Americans that allows you to contribute post-tax money (after tax money – meaning you do not receive a tax deduction at the time of contribution) for long-term tax free growth. This means the growth you accumulate in the account are tax-free when you withdraw them after age 59½