A 529 plan is a state-sponsored education savings program that allows an individual to save in a tax-deferred account to pay for a beneficiary's post-secondary education at any accredited school in the United States. Unlike Coverdell Education Savings Accounts, which excludes joint filers with adjusted gross incomes (AGIs) above $220,000 and single filers with AGIs above $110,000, there are no income restrictions on those contributing to the plan.