The Roth 401(k) is a type of retirement savings plan. It was authorized by the United States Congress under the Internal Revenue Code, section 402A, and represents a unique combination of features of the Roth IRA and a traditional 401(k) plan. As of January 1, 2006 U.S. employers have been free to amend their 401(k) plan document to allow employees to elect Roth IRA type tax treatment for a portion or all of their retirement plan contributions. The same change in law allowed Roth IRA type contributions to 403(b) retirement plans. The Roth retirement plan provision was enacted as a provision of the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA 2001).