You can contribute as much as you like to your SMART529 account until the account balance reaches $550,000 (including earnings and any amounts invested in the Prepaid Tuition Plan), at which point no further contributions can be made.1 If a designated beneficiary has more that one account in their name, the combined account balances may not exceed $550,000.
1 For more information about the aggregate amount that can be invested for any Designated Beneficiary, please see the College Savings Offering Statement or Prepaid Tuition Plan Disclosure Statement and Participation Agreement.