Investment Options: 401(k), IRA, Roth, HSA

The Power of Tax-Advantaged Accounts

The US tax code provides several account types that offer significant tax benefits for retirement saving, healthcare costs, and education funding. Using these accounts effectively is one of the most impactful financial decisions you can make — the tax savings alone can add hundreds of thousands of dollars to your lifetime wealth.

The key insight: where you hold your investments matters almost as much as what you invest in. The same $100,000 invested in the same index fund will produce dramatically different results in a taxable brokerage account versus a Roth IRA, simply because of how each is taxed.

401(k) Plans

The 401(k) is the foundation of retirement saving for most working Americans. If your employer offers one, it should be your first investment priority — especially if there is an employer match.

How It Works

Your employer deducts your contribution from your paycheck before taxes. If you earn $75,000 and contribute $10,000 to your 401(k), you are only taxed on $65,000. Your contribution and any investment growth are tax-deferred — you pay no taxes until you withdraw the money in retirement.

Contribution Limits (2026)

• Employee contribution: $23,500/year
• Employer match: varies (common formulas: 50% of first 6%, or 100% of first 3%)
• Total combined limit (employee + employer): $70,000/year
• Catch-up contribution (age 50+): additional $7,500/year

The Employer Match: Free Money

If your employer matches 50% of contributions up to 6% of your salary, and you earn $75,000:

• You contribute 6%: $4,500/year
• Employer matches 50%: $2,250/year
• Total: $6,750/year (you contributed $4,500, got $2,250 free)

Never leave the employer match on the table. It is a guaranteed 50-100% return on your contribution. No investment in history matches a guaranteed 50%+ immediate return.

Roth 401(k)

Many employers now offer a Roth 401(k) option alongside the traditional 401(k). Roth contributions are made with after-tax dollars (no upfront tax break), but all growth and qualified withdrawals are completely tax-free. The same $23,500 annual limit applies across both traditional and Roth 401(k) contributions combined.

Choose Roth 401(k) if: you expect your tax rate to be higher in retirement than it is now (common for young workers early in their careers).

Choose Traditional 401(k) if: you are in a high tax bracket now and expect to be in a lower bracket in retirement.

401(k) Investment Options

Most 401(k) plans offer a selection of mutual funds, including target-date funds, index funds, and actively managed funds. Look for:

• A low-cost S&P 500 or total stock market index fund
• A low-cost international stock fund
• A low-cost bond index fund
• A target-date fund matching your expected retirement year (if you want simplicity)

Avoid high-fee actively managed funds within your 401(k). Check expense ratios — anything above 0.50% is worth scrutinizing.

Individual Retirement Accounts (IRAs)

IRAs are personal retirement accounts you open and manage yourself at a brokerage (Fidelity, Schwab, Vanguard). They offer more investment options than most 401(k) plans and are available to anyone with earned income.

Traditional IRA

Tax treatment: Contributions may be tax-deductible (depending on income and whether you have a 401(k)). Growth is tax-deferred. Withdrawals in retirement are taxed as ordinary income.

Contribution limit (2026): $7,000/year ($8,000 if age 50+).

Deductibility rules: If you or your spouse have a 401(k), the deduction phases out above certain income levels. If neither has a 401(k), the full contribution is deductible regardless of income.

Roth IRA

The Roth IRA is considered by many financial advisors to be the single best retirement account available:

Tax treatment: Contributions are made with after-tax dollars (no deduction). All growth is tax-free. All qualified withdrawals in retirement are tax-free. You will never pay taxes on Roth IRA gains.

Contribution limit (2026): $7,000/year ($8,000 if age 50+) — shared with Traditional IRA (you can contribute to both, but total cannot exceed the limit).

Income limits: The ability to contribute directly to a Roth IRA phases out at higher incomes (approximately $150,000-$165,000 for single filers, $236,000-$246,000 for married filing jointly). Higher earners can use the “backdoor Roth” strategy (contribute to a Traditional IRA, then convert to Roth).

Withdrawal flexibility: You can withdraw your contributions (not gains) at any time, tax-free and penalty-free. This makes the Roth IRA a quasi-emergency fund — though you should avoid tapping retirement savings if at all possible.

Why Roth Is Often Better for Young Workers

If you earn $55,000 today and are in the 22% tax bracket, your Roth contribution costs you 22 cents per dollar in taxes upfront. But if your retirement portfolio grows to $1 million, every dollar you withdraw is tax-free. If you had used a Traditional IRA instead, you would owe income tax on every withdrawal — potentially at a higher rate if tax rates increase over the next 30-40 years.

IRA Investment Options

Unlike 401(k)s with limited menus, IRAs at major brokerages give you access to virtually every investment: individual stocks, ETFs, index funds, bonds, REITs, and more. For most people, the same three-fund portfolio from the investing basics lesson works perfectly in an IRA.

Health Savings Account (HSA)

The HSA is the only triple-tax-advantaged account in the US tax code:

1. Tax-deductible contributions (reduce your taxable income)
2. Tax-free growth (no taxes on investment gains)
3. Tax-free withdrawals for qualified medical expenses

Eligibility

You must have a High-Deductible Health Plan (HDHP) — for 2026, a plan with a deductible of at least $1,650 (individual) or $3,300 (family).

Contribution Limits (2026)

• Individual: $4,300/year
• Family: $8,550/year
• Catch-up (age 55+): additional $1,000/year

The HSA as a Stealth Retirement Account

The optimal HSA strategy:

1. Contribute the maximum each year
2. Invest the HSA balance in index funds (not just cash)
3. Pay current medical expenses out of pocket (save receipts)
4. Let the HSA grow tax-free for decades
5. Reimburse yourself for past medical expenses tax-free at any point in the future (there is no time limit)
6. After age 65, withdraw for any purpose (taxed as ordinary income, like a Traditional IRA) or for medical expenses (tax-free)

An HSA funded at $4,300/year for 30 years at 7% growth becomes approximately $430,000 — all available tax-free for medical expenses in retirement, when healthcare costs are highest.

529 College Savings Plans

529 plans are state-sponsored investment accounts designed for education savings:

Tax treatment: Contributions are not federally deductible (but many states offer a state tax deduction). Growth is tax-free. Withdrawals for qualified education expenses (tuition, room and board, books, supplies) are tax-free.

Contribution limits: Very high (often $300,000-$500,000+ per beneficiary lifetime), but annual contributions above $18,000 may trigger gift tax reporting.

Beneficiary flexibility: You can change the beneficiary to another family member if the original beneficiary does not need the funds. Since 2024, unused 529 funds can be rolled into a Roth IRA for the beneficiary (up to $35,000 lifetime, subject to annual Roth contribution limits).

Best use: Parents saving for children’s college education, or individuals saving for their own graduate school.

Taxable Brokerage Accounts

A regular brokerage account at Fidelity, Schwab, or Vanguard has no contribution limits, no income restrictions, and no penalties for withdrawal. The tradeoff: no special tax benefits.

When to use a taxable brokerage:

• You have maxed out all tax-advantaged accounts (401(k), IRA, HSA)
• You need to save for goals shorter than retirement (5-15 years)
• You want complete flexibility with no withdrawal restrictions

Tax-efficient investing in taxable accounts:

• Hold index funds and ETFs (more tax-efficient than mutual funds)
• Favor long-term capital gains (held over 1 year, taxed at 0%, 15%, or 20% depending on income) over short-term gains (taxed as ordinary income)
• Use tax-loss harvesting — sell investments at a loss to offset gains, reducing your tax bill
• Hold bonds and REITs (which generate ordinary income) in tax-advantaged accounts, and stocks (which generate lower-taxed capital gains) in taxable accounts

The Optimal Account Priority Order

When you have limited money to invest, prioritize in this order:

1. 401(k) up to employer match — guaranteed 50-100% return
2. HSA maximum — triple tax advantage
3. Roth IRA maximum — tax-free growth forever
4. 401(k) up to maximum — tax-deferred growth
5. 529 plan — if you have education savings needs
6. Taxable brokerage — unlimited contributions, flexible access

A person earning $75,000 who follows this order and contributes $23,500 to a 401(k), $7,000 to a Roth IRA, and $4,300 to an HSA is investing $34,800/year — a 46% savings rate on gross income. Not everyone can reach these numbers immediately, but the priority order helps you allocate each additional dollar optimally.

Where to Open Your Accounts

For IRAs, HSAs, and brokerage accounts, the three largest low-cost brokerages are:

All three are excellent. Choose based on which features matter most to you, or simply pick the one with the best mobile app in your opinion. Any of these platforms also enables you to explore retirement planning strategies if you have ties to other countries.

Key Takeaways

• Tax-advantaged accounts (401(k), IRA, HSA) can save you hundreds of thousands of dollars in taxes over your lifetime.
• Never leave employer 401(k) match money on the table — it is a guaranteed 50-100% return.
• Roth IRAs offer tax-free growth and tax-free withdrawals — ideal for young workers in lower tax brackets.
• HSAs are the only triple-tax-advantaged account in the US tax code — maximize if eligible.
• 529 plans offer tax-free growth for education expenses, with new flexibility to roll unused funds into Roth IRAs.
• Follow the priority order: employer match → HSA → Roth IRA → 401(k) max → 529 → taxable brokerage.
• Open accounts at Fidelity, Schwab, or Vanguard for the lowest costs and best tools.

In the next lesson, you will learn how to plan for retirement — Social Security, the 4% rule, target-date funds, and how much you actually need to retire comfortably.