How often can I change the investments in my 529 plan?

The IRS limits you to changing the investment options on an existing 529 balance twice per calendar year, or when you change the beneficiary. This rule exists because 529s are meant for long-term saving, not active trading. Importantly, you can still direct new contributions into different portfolios at any time without using up an exchange. Many families structure this deliberately: keep older contributions in an age-based track and steer fresh money toward a chosen allocation. If you want to de-risk as college approaches, an age-based or target-enrollment portfolio does that automatically, so you rarely need to burn your two allowed changes. Plan your reallocations carefully so an ill-timed move doesn't lock you out for the rest of the year.