What Section 530A actually does — and why the tax structure matters

The Section 530A account, created under the One Big Beautiful Bill Act, is a new savings vehicle for children. The federal government seeds $1,000 at birth for any child born between January 1, 2025 and December 31, 2028, provided both parents have Social Security numbers. After that, families and employers can contribute up to $5,000 per year combined — and the child does not need earned income to receive contributions. A newborn qualifies.

The contributions are after-tax. That's the critical detail that makes the Roth rollover at 18 so powerful.

The tax structure at age 18

At 18, the account can roll to a Roth IRA without counting against the annual Roth IRA contribution limit. Only the accumulated growth above the original contributions (the basis) is taxable on conversion. The principal rolls over tax-free because it was already after-tax money.

Here's where it gets interesting. A typical 18-year-old with no other income has the full standard deduction available — approximately $16,100 in 2026. The first $16,100 of growth is tax-free at conversion. Families who contribute $5,000/year for 18 years at a 7% return accumulate roughly $170,000, with a basis around $91,000 and growth around $79,000. The growth is taxable on rollover, but with minimal income at 18, the effective conversion tax rate is very low. Often 10-12%.

The kiddie tax exception

If the child is still a full-time student under 24 and a dependent, the kiddie tax rule applies: unearned income above a small threshold gets taxed at the parent's marginal rate, not the child's. This changes the conversion math significantly for high-income families. The calculator includes a kiddie tax toggle so you can model both scenarios.

Roth vs. Traditional IRA after rollover

After the rollover, the choice is whether to keep the money in Roth (tax-free growth and withdrawals) or redirect it to a traditional IRA (deductible contributions, taxable withdrawals). Roth wins when the tax rate at conversion is lower than the expected tax rate in retirement. Traditional wins in the opposite case. For most 18-year-olds converting a 530A, the conversion rate is low — which is a strong argument for Roth. The calculator shows the retirement value of each path under your expected marginal rate.

Employer contributions

The legislation allows employers to offer 530A contributions as a benefit, similar to a dependent care FSA. The $5,000/year cap is combined — family plus employer, not separate. If your employer contributes $1,000, the family can add $4,000 more before hitting the cap.

Section 530A was created under legislation pending as of April 2026. Projections assume current law and contribution limits. Tax treatment references 2026 standard deduction levels. Consult a financial advisor before making contribution decisions.