For years, the government and financial experts have encouraged individuals to save more money for retirement. One of the best ways to save is to use tax beneficial accounts, including 401k, 403(b) or traditional IRAs. These accounts allow assets to grow tax deferred until the funds are withdrawn, which is not required until an individual reaches age 70 and a half. As a result, many people will die with significant assets in these tax protected accounts, which can pose challenges for proper estate planning. However, retirement asset trusts can provide a solution.