529 vs. Roth IRA for Kids: Which Long-Term Account Wins?

When parents start thinking about long-term investing for kids, the two most common starting points are a 529 plan and a Roth IRA. Both are tax-advantaged. Both have decades to compound. And they look superficially similar.

They're not. They optimize for completely different futures, and the choice between them is mostly a question about what you think your kid will need money for at 25.

The one-sentence summary

A 529 is a college savings account. A Roth IRA is a retirement account. The 529 assumes your kid is going to use the money in 10–18 years. The Roth IRA assumes they won't touch it for 50+.

Side-by-side

The earned-income gotcha

A custodial Roth IRA can only be funded with money the child earned. Allowance doesn't count. Money you give them as a gift doesn't count. The IRS wants real, documented income — typically a W-2 from a part-time job or self-employment income from a small business (lawn-mowing, babysitting, modeling, content creation).

For young kids, this is the #1 reason families skip the Roth IRA route. A 6-year-old rarely has earned income. By 14 or 15, when many kids start their first job, the Roth IRA suddenly becomes one of the most powerful financial moves a parent can make.

The math is brutal in a good way:

• A 14-year-old contributing $3,000/year from age 14 to 18 (5 years, $15,000 total) ends up with roughly $415,000 at age 65 at 7% returns.
• That same $15,000 contributed at age 30 instead grows to about $140,000 by 65. Same dollars in. A third of the result.
• Time is the secret weapon. A Roth IRA started at 14 is the most overpowered move in personal finance.

The 529 case

A 529 plan optimizes for a single, very predictable expense: college. If you're confident your kid is going to college (or your state offers a deduction for 529 contributions, which most do), the 529 is hard to beat:

• You can front-load: gift up to 5 years of contributions at once without triggering gift tax.
• Many states offer a state income tax deduction on contributions.
• The new SECURE 2.0 rules let unused 529 funds roll into a Roth IRA (lifetime cap of $35,000) — so even if your kid skips college, the money isn't stranded.
• K–12 expenses (up to $20,000/year as of 2026) and trade school programs now qualify too.

The Roth IRA case

The Roth IRA optimizes for the long game:

• Decades of tax-free growth. Money put in at 14 has 50+ years to compound before retirement age.
• Contributions can be withdrawn anytime, tax-free. If your kid needs the money for a down payment at 30, the contributions (not earnings) come out penalty-free.
• $10,000 first-home exception. Earnings can be used for a first home purchase without the 10% penalty.
• Education exception. Earnings can pay for qualified higher-education expenses without the early-withdrawal penalty (though they're still taxed).

Most families end up with both

The honest answer for most families: it's not a choice. It's a sequencing problem.

• From birth to age 13, fund the 529. Capture state tax deductions, build the college runway.
• The first year your kid earns real income, open the custodial Roth IRA. Match what they earn (up to the $7,500 cap) so they can experience "saving" without losing all their earnings.
• Continue the 529 in parallel as long as you can afford to.
• If college costs less than expected, the SECURE 2.0 Roth-rollover rule lets you move up to $35,000 from the 529 to the kid's Roth IRA. The two accounts essentially merge into a single long-term wealth vehicle.

Where MemoryBank fits

The case for showing both accounts to your kid through one dashboard is strongest exactly here. A 529 looks like a number on a Vanguard statement. A Roth IRA looks like a number on a Fidelity statement. Both are abstract. Neither feels like "mine" until your kid can see them growing, side by side, on a screen they own.

Showing a 14-year-old that their first $1,500 from a summer job is now $1,612 because they own 4 shares of VOO and Apple just announced earnings is the kind of moment that turns a teenager into a lifelong investor. That's the bet MemoryBank is built on.