Should I use my own state's 529 plan or pick another state's?

Start with your own state's plan only if it gives you a state income-tax deduction or credit for contributing — that's free money worth several hundred dollars a year. If your state offers no deduction (or has no income tax, like Texas or Florida), you're free to shop nationwide for the plan with the lowest fees and best investment options. Any state's 529 can pay for school in any state, so geography doesn't limit where your child attends. A few states offer "tax parity," giving a deduction even for out-of-state plans. Compare the expense ratios and underlying index funds before deciding. Run the numbers for your family with wealthserene.com/tools/college-planner to see how fees and savings stack up over 18 years.