529 vs Taxable Brokerage: Which Should You Pick?
529 or a taxable brokerage for college? Tax-free growth and a state deduction vs full flexibility. When the 529 wins decisively and when flexibility is worth more.
Saving for a child’s education comes down to a tax-advantaged account built for it, the 529, versus a taxable brokerage you can use for anything. The 529 grows tax-free if used for school; the taxable account stays flexible at the cost of annual tax drag.
Quick answer
Fund the 529 for money you are confident will go to education, especially over long horizons and in higher tax brackets, where tax-free growth and a state deduction compound into a large advantage. Use a taxable brokerage for money you might need elsewhere; its flexibility is worth the modest tax cost when education is uncertain. When unsure, do both: fund the 529 up to your confident education number and route the surplus to taxable. SECURE 2.0 also softened the old risk by allowing up to $35,000 of leftover 529 funds to roll into a Roth IRA.
| 529 plan | Taxable brokerage | |
|---|---|---|
| Growth | Tax-free compounding | Taxed on dividends and realized gains |
| Qualified education use | Tax-free withdrawals | Long-term capital gains tax (0-20%) |
| Non-education use | Income tax + 10% penalty on earnings | Capital gains tax; no penalty |
| Flexibility | Education; $35k lifetime Roth rollover (SECURE 2.0) | Any purpose, anytime |
| State tax break | Deduction in many states | None |
| 5 yrs, 12% bracket | 529 ahead ~$3,411 | Flexibility may outweigh |
| 13 yrs, 24% bracket | 529 ahead ~$47,904 | 529 clearly better |
| 18 yrs, 35% bracket | 529 ahead ~$175,856 | 529 overwhelmingly better |
See the full guide for the modeled scenarios and assumptions.
Who should pick which
Favor the 529 if you
- Are confident the money is for education.
- Have a long horizon (10+ years) or a high bracket.
- Get a state tax deduction for contributions.
Favor taxable if you
- Are unsure the child will need it for school.
- Have a short horizon (under 5 years).
- Value full flexibility over the tax savings.
The full reasoning
For the modeled scenarios, the drivers of the 529’s edge, and how to size each account, read 529 vs. Taxable Brokerage: Which Account Wins for College Savings?.
Want to see how this fits your whole portfolio?
Summitward turns portfolio, tax, and life-planning tradeoffs into decisions you can act on, including overlap, concentration, and tax-location analysis across your accounts.