Families have many tax-advantaged accounts to choose from: 401(k)s, IRAs, HSAs, 529 plans, Trump Accounts, and taxable brokerage accounts. This is a practical ranking, not a scientific formula.

Federal tax rules shown below. State rules, employer-plan terms, eligibility, and personal goals can change the ranking.

Quick comparison

Account Taxable at contribution? Taxable while invested? Taxable at withdrawal? Note
Traditional 401(k) / deductible Traditional IRA No* No Yes Withdrawals are generally ordinary income
Roth 401(k) / Roth IRA / backdoor Roth IRA Yes No No Qualified withdrawals are tax-free
HSA No* No No Requires HSA eligibility; Tax free for qualified medical expenses
529 Yes** No No Education-focused account, Tax free for qualified education expenses
Trump Account Yes No Yes Contributions generally come out tax-free; earnings are generally ordinary income
Taxable brokerage Yes Yes Yes Interest, dividends, and realized gains can create annual tax drag

* “No” means pretax or deductible for federal purposes. Traditional-account growth is tax-deferred, not tax-free. HSA contributions and earnings receive favorable federal treatment only when eligibility and qualified-medical-expense rules are met.

** Many states offer a 529 deduction or credit, but rules vary by state. California offers no state income-tax deduction for 529 contributions (ScholarShare 529, n.d.).

The rankings

  1. Employer match. Capture the full employer match first. It is often the highest-value step.

  2. Trump Account with the $1,000 pilot contribution. Open a Trump Account for an eligible child to claim the $1,000 federal pilot contribution. The pilot contribution is available to eligible children born from 2025 through 2028 (Congressional Research Service [CRS], 2026b).

  3. HSA, if eligible. Use an HSA if you have qualifying HDHP coverage. It can provide a federal tax benefit at contribution, growth, and qualified medical withdrawal. For 2026, the limits are $4,400 for self-only coverage and $8,750 for family coverage (CRS, 2026a).

  4. Workplace retirement plan and IRA. Choose Traditional versus Roth based on the tax-rate comparison:

    • Higher current tax rate: Traditional contributions often look better.
    • Higher expected future tax rate: Roth contributions often look better.
    • Uncertain: using both can diversify future tax risk.

    A Traditional 401(k) is generally pretax. A Traditional IRA deduction can be limited by income and workplace-plan coverage. Roth 401(k) contributions are available only if the employer plan offers them. Direct Roth IRA contributions have income limits; a backdoor Roth IRA may be available, but the pro-rata rule matters. A mega backdoor Roth is a 401(k)-plan strategy, not an IRA strategy, and requires a plan that permits after-tax contributions and Roth conversions or rollovers.

  5. 529 plan. Use a 529 for a defined education goal. Contributions are not federally deductible, but qualified education withdrawals can be tax-free. Many states offer a deduction or credit; California does not (ScholarShare 529, n.d.).

  6. Trump Account without the $1,000 contribution. A Trump Account can still be opened for a child who does not receive the pilot contribution. However, additional contributions are after-tax, and earnings are generally taxable as ordinary income when distributed. For long-term retirement savings, Roth accounts usually have better tax treatment. For education savings, a 529 is usually the clearer choice (CRS, 2026b).

  7. Taxable brokerage account. Use a taxable brokerage account for flexible long-term savings. It has no special account-level tax benefit, but it is not restricted to retirement, health, or education.

State note

State tax treatment can change the result. California does not provide a 529 contribution deduction. California also generally does not conform to the federal HSA rules or the federal Trump Account provisions (California Franchise Tax Board [FTB], 2024, 2026).

References

California Franchise Tax Board. (2024, June 14). Bill analysis: SB 230—Health Savings Account deduction conformity. https://www.ftb.ca.gov/tax-pros/law/legislation/2023-2024/SB230-061324.pdf

California Franchise Tax Board. (2026, April 15). Summary of federal income tax changes. https://www.ftb.ca.gov/about-ftb/data-reports-plans/Summary-of-Federal-Income-Tax-Changes/index.html

Congressional Research Service. (2026, February 23). Health savings accounts (CRS Report No. R45277). https://www.congress.gov/crs-product/R45277

Congressional Research Service. (2026, June 15). Trump accounts: Overview and policy considerations (CRS Report No. R48910). https://www.congress.gov/crs-product/R48910

ScholarShare 529. (n.d.). 529 plan FAQs: Contributions, withdrawals, and rules. https://www.scholarshare529.com/resources/faq