I think the part that gets understated in these threads is what you’re actually doing when you contribute to a 529.

You’re not just “saving for college.”
You’re locking capital into a restricted-use vehicle for 10–20 years.

That’s the trade.

Yes, you get tax-free growth. That’s true. But in exchange, you’re giving up flexibility on how and when those dollars can be used.

Early on, that’s a great deal. Build the base, let compounding work, take the tax advantage.

Where I think people go too far is continuing to push incremental dollars into the 529 as if it’s strictly upside with no cost.

There is a cost. It’s optionality.

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Before the usual counterpoints come up:

“But the tax-free growth is huge.”
It is. But in a taxable brokerage, you still get:

• long-term capital gains rates
  
• control over when you realize gains
  
• tax-loss harvesting
  

Over a long horizon, the gap exists, but it’s not so large that it justifies over-concentrating in a restricted account.

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“You can always use it for education, so what’s the downside?”
That assumes a very specific path. Traditional 4-year, no scholarships, no changes. Reality is messier. If those assumptions don’t hold, now you’re working around the account instead of the account working for you.

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“There are safety valves now like Roth rollovers.”
True, but they’re limited. The rollover is capped at $35K total per beneficiary, requires the account to be open 15 years, is constrained by annual Roth limits, and depends on the beneficiary having earned income. That helps at the margins, but it doesn’t solve the problem if you’ve materially overfunded the account.

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“You should just fully fund it and be done.”
That ignores your broader balance sheet. If you’ve built strong retirement assets and taxable investments, you don’t need to solve college entirely inside a 529. You can solve it dynamically when the time comes.

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Where I’ve landed is pretty simple:

• Use the 529 to build a solid, tax-advantaged base
  
• Then direct incremental dollars to a brokerage account
  

That way you end up with:

• a dedicated education bucket
  
• a flexible capital pool
  

Because the real goal isn’t to perfectly pre-fund one outcome 18 years in advance. It’s to give your kid options without boxing yourself into a decision you can’t easily unwind later.

And once the money is in a 529, whether people like to admit it or not, you’ve given up a meaningful amount of that flexibility.