529 Plan vs Other College Savings Methods: Complete Tax and Growth Comparison
Which account type wins for college savings? A head-to-head comparison of 529 plans, high-yield savings accounts, UTMA/UGMA custodial accounts, and taxable brokerage accounts with real growth projections.
Updated July 2026
Quick verdict
For dedicated college savings, a 529 plan wins on tax efficiency. For maximum flexibility, pair a 529 with a Roth IRA. Only use taxable accounts after maximizing tax-advantaged options. Avoid UTMA accounts if the child qualifies for need-based financial aid, due to the 20% FAFSA assessment rate.
Side-by-Side Comparison Table
| Feature | 529 Plan | HYSA | UTMA/UGMA | Brokerage | Roth IRA |
|---|---|---|---|---|---|
| Tax on growth | None (qualified) | Income tax | Kiddie tax | Cap gains 15-23.8% | None (qualified) |
| State deduction | 30+ states | None | None | None | None |
| FAFSA assessment | 5.64% (parent) | 5.64% (parent) | 20% (student) | 5.64% (parent) | Excluded* |
| Contribution limit | State max | None | Gift tax rules | None | $7,500/yr |
| Income limits | None | None | None | None | Yes |
| Owner control | Account owner | Account owner | Child at 18-21 | Account owner | Account owner |
| Investment options | Plan choices | Savings rate | Unlimited | Unlimited | Unlimited |
| Use restriction | Education focused | None | None | None | Flexible |
*Roth IRA assets excluded from FAFSA if parent is owner and account is not in distribution mode.
$300/Month for 18 Years: After-Tax Growth Projections
| Account Type | Gross Return | After-Tax Balance | Tax Cost | Notes |
|---|---|---|---|---|
| 529 Plan | 7.0% | $130,000 | $0 | Fully tax-free for qualified expenses |
| Roth IRA | 7.0% | $130,000 | $0 | Tax-free if education qualifies; limited to $7,500/yr |
| Brokerage Account | 7.0% | $110,500 | $19,500 | Long-term cap gains at 15% on earnings |
| UTMA/UGMA | 7.0% | $107,000 | $23,000 | Kiddie tax applies on earnings above $2,500/yr |
| High-Yield Savings | 4.5% | $88,000 | $12,000 | Interest taxed as ordinary income each year |
Projections assume 18 years of $300/month contributions starting from birth. Tax calculations use 24% federal bracket, 15% long-term capital gains rate. Actual results vary.
When a 529 Plan Wins
- + Family is confident child will pursue higher education
- + You live in a state with a generous deduction (Indiana, Illinois, SC)
- + Child may qualify for need-based financial aid (lower FAFSA hit)
- + Grandparents want to reduce taxable estate while funding education
- + You want to pay for K-12 private school (up to $20,000/yr in 2026)
When a Brokerage or HYSA Wins
- ! You need the funds within 1-2 years (HYSA is safest for short-term)
- ! Child's educational path is very uncertain (brokerage offers full flexibility)
- ! You have already maxed 529 contributions up to state maximum
- ! You want to invest in individual stocks or real estate (brokerage wins on flexibility)
For the short-term money in that right-hand list, or anything you will need within a year or two, a high-yield savings account is the usual home. Raisin lists high-yield savings and CD accounts from smaller US banks and credit unions in one place.
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The Real Cost of Taxable Growth
Assume you accumulate $100,000 in investment gains over 18 years. In a 529 plan used for qualified education, you owe $0 in federal tax on that gain. In a taxable brokerage account, you owe $15,000 (at 15% long-term rate) to $23,800 (at 23.8% for high earners with net investment income tax). In a UTMA account, the kiddie tax may push some of the gain into the parent's bracket for years when the child is under 19 (or 24 if a full-time student). The 529 tax advantage is not just about the rate. It eliminates an entire layer of taxation on the growth of your investment.