A 529 plan is a tax-advantaged savings account built specifically for education costs, run by individual states rather than the federal government, though you're not required to use your own state's plan. * Anyone can open one — a parent, grandparent, or even the future student themselves — naming a designated beneficiary who the funds are ultimately meant for. Contributions get invested, commonly in stock and bond mutual funds or age-based portfolios, and any investment growth accumulates tax-deferred the entire time it sits in the account. * The real payoff comes at withdrawal: as long as the money is spent on qualified education expenses, withdrawals — including all the accumulated growth — are completely free of federal income tax. Many states go further and offer their own state income tax deduction or credit for contributions, on top of the federal tax benefit. * "Qualified expenses" cover more than just college tuition. 529 funds can pay for room and board, required textbooks, K-12 tuition at public, private, or religious schools, vocational and trade school costs, apprenticeship program expenses, and even a limited amount toward paying down existing student loan principal and interest. * Two features make 529s notably flexible compared to other tax-advantaged accounts: there's no annual federal contribution limit, unlike an IRA or 401(k), and the account owner retains full control the entire time, including the ability to change the named beneficiary to a different family member at any point if the original beneficiary doesn't end up needing all the funds.