Just looked into 529 plans for my niece's college fund and wow, the max 529 contribution limits vary wildly by state. Arizona tops out at $575k while Georgia and Mississippi are only at $235k. Kind of crazy how much it depends on where you live.

Here's the thing though - these are lifetime limits per beneficiary, not per account. So if your parents also open a plan for the same kid, you're both counting toward that same ceiling. Also, there's technically no annual contribution cap, but gift tax rules get involved if you go too hard in one year. The sweet spot is that special 5-year election where you can dump like $95k upfront without triggering gift tax issues.

One thing that threw me - most states only let you deduct 529 contributions on your state taxes if you use YOUR state's plan. So if you live in a state with a lower limit, switching to another state's plan might seem smart, but you'd lose that tax deduction. Plus not all plans even accept out-of-state residents. Fees and investment options matter too, so it's not just about the max 529 contribution number.

Basically, if you're planning for college expenses, the contribution limits are just one part of the puzzle. The tax benefits and what your state allows matter just as much.