Every dollar you invest lives inside an account, and the type of account determines how that dollar is taxed, when you can access it, and how much you are allowed to contribute. Choosing the right investments in the wrong accounts — or the wrong combination of accounts — can cost tens of thousands of dollars over a lifetime.
This guide covers every major investment account type available in the United States, organized into three categories: employer-sponsored retirement accounts, individual retirement accounts, and general-purpose investment accounts. For each account, you will find who is eligible to open one, what it is most useful for, and the rules that govern it.
These accounts are offered through your employer. You cannot open one on your own.
The most common employer-sponsored retirement plan. Contributions come directly from your paycheck before you receive it.
| Feature | Details |
|---|---|
| Who qualifies | Employees of private-sector companies that offer a 401(k) plan. Most plans require you to be at least 21 and have completed a minimum service period (often 1 year, though many now offer immediate eligibility). Part-time employees working 500+ hours per year for 2 consecutive years must be eligible under SECURE 2.0. |
| 2025 contribution limit | $23,500 employee; $31,000 if age 50+; $34,750 if ages 60-63 (SECURE 2.0 super catch-up) |
| Total limit (employee + employer) | $70,000 ($77,500 if 50+; $81,250 if 60-63) |
| Tax treatment | Traditional: pre-tax contributions, taxed as ordinary income on withdrawal. Roth: after-tax contributions, qualified withdrawals tax-free. |
| Early withdrawal penalty | 10% before age 59.5, plus income tax on traditional balances. Exceptions for hardship, disability, substantially equal periodic payments (72(t)/SEPP), and the Rule of 55 (separation from service at 55+). |
| RMDs | Starting at age 73 (rising to 75 in 2033). Roth 401(k) accounts are exempt from RMDs as of 2024 under SECURE 2.0. |
Best for: Anyone whose employer offers one. The employer match — typically 50-100% on the first 3-6% of salary — is the single highest guaranteed return available in investing. Contribute at least enough to capture the full match before funding any other account.
Roth vs. Traditional 401(k): If you are early in your career and earning less than you expect to earn later, Roth contributions lock in today's lower tax rate. If you are in peak earning years, traditional contributions reduce your current tax bill. Many people benefit from splitting contributions between both for tax diversification. See Tax Benefits of Retirement Accounts for a deeper comparison.
The public-sector and nonprofit equivalent of the 401(k).
| Feature | Details |
|---|---|
| Who qualifies | Employees of public schools, tax-exempt nonprofits (501(c)(3) organizations), churches, and certain hospitals. |
| Contribution limits | Same as 401(k): $23,500 ($31,000 if 50+, $34,750 if 60-63). Additionally, employees with 15+ years of service at certain organizations may qualify for a $3,000/year additional catch-up (lifetime max $15,000). |
| Tax treatment | Same as 401(k) — traditional and Roth options available. |
| Key difference | Investment options are sometimes limited to annuities and mutual funds. Some older 403(b) plans have higher fees than typical 401(k) plans. |
Best for: Public-sector and nonprofit employees. Functionally identical to a 401(k) for planning purposes.
A deferred-compensation plan for state and local government employees and some nonprofit employees.
| Feature | Details |
|---|---|
| Who qualifies | Employees of state and local governments (governmental 457(b)) or certain tax-exempt nonprofits (non-governmental 457(b)). Not available to federal employees or private-sector workers. |
| 2025 contribution limit | $23,500 ($31,000 if 50+, $34,750 if 60-63). Crucially, this limit is separate from the 401(k)/403(b) limit — if your employer offers both, you can max out both. |
| Tax treatment | Traditional (pre-tax) is standard. Some governmental plans now offer a Roth option. |
| Early withdrawal penalty | None for governmental 457(b) upon separation from service at any age. This is the 457(b)'s unique advantage. Non-governmental 457(b) plans have more restrictions. |
| RMDs | Same as 401(k). |
Best for: Government employees planning early retirement. The absence of the 10% early withdrawal penalty makes the governmental 457(b) one of the most flexible retirement accounts available. If you have access to both a 403(b) and a governmental 457(b), maxing out both lets you shelter up to $47,000 per year in tax-advantaged space (before catch-up contributions).
The retirement savings plan for federal employees and members of the uniformed services.
| Feature | Details |
|---|---|
| Who qualifies | Federal civilian employees (FERS and CSRS) and members of the uniformed services (Army, Navy, Air Force, Marines, Coast Guard, Space Force, Public Health Service, NOAA). |
| 2025 contribution limit | Same as 401(k): $23,500 ($31,000 if 50+, $34,750 if 60-63) |
| Employer match (FERS) | Automatic 1% agency contribution plus dollar-for-dollar match on first 3% and $0.50 per dollar on next 2% (total 5% match on 5% employee contribution). |
| Investment options | Five individual funds (G, F, C, S, I) and Lifecycle (L) target-date funds. Very low expense ratios (around 0.05%). |
| Tax treatment | Traditional and Roth options available. |
Best for: Federal employees and service members. The TSP's extremely low fees make it one of the best retirement plans in the country. FERS employees should contribute at least 5% to capture the full agency match.
Savings Incentive Match Plan for Employees — a simplified retirement plan for small businesses.
| Feature | Details |
|---|---|
| Who qualifies | Employees of businesses with 100 or fewer employees that do not maintain another retirement plan. Self-employed individuals also qualify. Employees earning at least $5,000 in any 2 prior years and expecting $5,000 in the current year must be eligible. |
| 2025 employee contribution limit | $16,500 ($17,500 if age 50+) |
| Employer contribution | Either a dollar-for-dollar match on the first 3% of compensation, or a flat 2% non-elective contribution to all eligible employees. |
| Early withdrawal penalty | 25% in the first 2 years of participation (not the typical 10%), then 10% before age 59.5 |
Best for: Employees of small businesses that do not offer a 401(k). The contribution limits are lower than a 401(k), but the mandatory employer contribution guarantees at least some employer-funded retirement savings. Be cautious about early withdrawals during the first two years due to the elevated 25% penalty.
You open these accounts yourself, independent of any employer.
| Feature | Details |
|---|---|
| Who qualifies | Anyone with earned income (wages, salary, self-employment income, alimony received under pre-2019 agreements). There is no age limit. Non-working spouses can contribute through a Spousal IRA if the couple files jointly and the working spouse has sufficient earned income. |
| 2025 contribution limit | $7,000 ($8,000 if age 50+) — this limit is shared with the Roth IRA |
| Deductibility | Fully deductible if you (and your spouse) have no workplace retirement plan. If you do have a workplace plan, deductibility phases out at higher incomes ($79,000-$89,000 single; $126,000-$146,000 MFJ for the covered spouse; $236,000-$246,000 MFJ for the non-covered spouse). |
| Tax on growth | Deferred |
| Tax on withdrawals | Ordinary income tax on deductible contributions and all earnings |
| Early withdrawal penalty | 10% before age 59.5 (exceptions for first home purchase up to $10,000, qualified education expenses, disability, birth/adoption up to $5,000, and others) |
| RMDs | Starting at age 73 (75 in 2033) |
Best for: Workers without access to an employer plan (full deduction regardless of income), and anyone executing the Backdoor Roth strategy (non-deductible contributions converted to Roth). If you have a workplace plan and earn too much for a deduction, the Traditional IRA on its own offers little advantage over a taxable account — but it remains the essential gateway to the Backdoor Roth.
| Feature | Details |
|---|---|
| Who qualifies | Anyone with earned income whose modified adjusted gross income (MAGI) is below the contribution threshold. In 2025: $150,000-$165,000 single; $236,000-$246,000 married filing jointly. Above the upper threshold, no direct contributions are allowed — but the Backdoor Roth IRA strategy (non-deductible Traditional IRA contribution followed by immediate Roth conversion) works regardless of income. |
| 2025 contribution limit | $7,000 ($8,000 if age 50+) — shared with Traditional IRA |
| Tax on contributions | After-tax (no deduction) |
| Tax on qualified withdrawals | Completely tax-free — both contributions and all earnings, after age 59.5 and a 5-year holding period |
| Contributions accessible | Anytime, at any age, tax-free and penalty-free (you already paid tax on them) |
| Earnings early withdrawal | 10% penalty + income tax before age 59.5 (exceptions apply) |
| RMDs | None during the owner's lifetime |
Best for: Almost everyone. The Roth IRA is the most flexible tax-advantaged account in existence. Contributions can be withdrawn at any time for any reason, making it a backup emergency fund. Qualified withdrawals are tax-free, and there are no RMDs — your money can grow tax-free for your entire life and pass to heirs. Early-career workers in low tax brackets benefit the most from locking in today's low rate, but high earners should use the Backdoor Roth to access this account regardless of income.
The Backdoor Roth IRA: Contribute to a non-deductible Traditional IRA, then convert to Roth. The conversion is tax-free if you have no other pre-tax IRA balances. If you do have pre-tax IRA money, the pro-rata rule will make part of the conversion taxable — roll those pre-tax balances into your 401(k) first to avoid this. See Maximizing Retirement Account Contributions for step-by-step details.
| Feature | Details |
|---|---|
| Who qualifies | Self-employed individuals (sole proprietors, freelancers, independent contractors), small business owners, and their eligible employees. Any employee who is 21+, has worked for the employer in 3 of the last 5 years, and earned at least $750 in compensation must be included. |
| 2025 contribution limit | 25% of net self-employment income (or 25% of compensation for employees), up to $70,000 |
| Who contributes | Employer only. If you are self-employed, you are both employer and employee. You cannot make employee elective deferrals. |
| Tax treatment | Same as Traditional IRA — deductible contributions, tax-deferred growth, taxed on withdrawal |
Best for: Self-employed individuals with high and variable income. The high contribution ceiling ($70,000) and the ability to contribute a percentage of income make it ideal for years when business income is strong. If you have employees, note that you must contribute the same percentage of compensation for them as you do for yourself.
| Feature | Details |
|---|---|
| Who qualifies | Self-employed individuals and business owners with no employees other than a spouse. If you hire non-spouse employees, you generally must switch to a different plan type. |
| 2025 contribution limit | $23,500 employee contribution ($31,000 if 50+, $34,750 if 60-63) PLUS employer contributions of up to 25% of net self-employment income, total up to $70,000 ($77,500 if 50+) |
| Tax treatment | Traditional and Roth employee contributions available. Employer contributions are always pre-tax. |
| Loan provision | Many Solo 401(k) plans allow you to borrow up to 50% of the vested balance (max $50,000). |
| Mega Backdoor Roth | Some plans allow after-tax contributions above the employee limit, converted to Roth — the same strategy available in corporate 401(k) plans with this feature. |
Best for: Self-employed individuals and owner-only businesses. The Solo 401(k) offers the highest total contribution room of any self-employed retirement plan, plus the Roth option that the SEP IRA lacks. If your self-employment income is high enough, you can shelter more money here than in any other single account.
The HSA straddles the line between a healthcare account and a retirement account. It is the only account in the US tax code with triple tax benefits.
| Feature | Details |
|---|---|
| Who qualifies | Individuals enrolled in a High Deductible Health Plan (HDHP). In 2025, the HDHP minimum deductible is $1,650 individual / $3,300 family, with maximum out-of-pocket of $8,300 / $16,600. You cannot be enrolled in Medicare, claimed as a dependent, or covered by a non-HDHP (including a spouse's general-purpose FSA). |
| 2025 contribution limit | $4,300 individual; $8,550 family. Add $1,000 catch-up if age 55+. |
| Triple tax advantage | Contributions are tax-deductible (or pre-tax via payroll), growth is tax-free, and withdrawals for qualified medical expenses are tax-free at any age. |
| Non-medical withdrawals | Before age 65: income tax + 20% penalty. After age 65: income tax only (functions like a Traditional IRA). |
| RMDs | None |
Best for: Anyone with an HDHP who can afford to pay current medical expenses out of pocket. The optimal strategy is to invest HSA contributions for long-term growth, pay medical bills from other funds, save every medical receipt, and reimburse yourself years or decades later — withdrawing the full accumulated amount tax-free. After age 65, the HSA becomes an unrestricted retirement account (taxed like a Traditional IRA for non-medical use) with no RMDs.
See Health Savings Accounts for a complete guide.
These accounts have no special retirement purpose and no early withdrawal penalties. They are available to virtually everyone.
| Feature | Details |
|---|---|
| Who qualifies | Any US resident age 18+ (age varies by state). Joint accounts are available for couples. Custodial accounts (UGMA/UTMA) can be opened for minors. No income limits, no contribution limits. |
| Contribution limit | None |
| Tax on dividends | Taxed annually. Qualified dividends at preferential rates (0%, 15%, or 20% depending on income). Non-qualified dividends taxed as ordinary income. |
| Tax on capital gains | Taxed when you sell. Long-term gains (held 1+ year) at 0%, 15%, or 20%. Short-term gains taxed as ordinary income. |
| Withdrawals | Anytime, for any reason, no penalties. |
Best for: Everyone, once tax-advantaged space is exhausted. The taxable brokerage account is where your money goes after you have maxed out your 401(k), IRA, HSA, and any other tax-advantaged accounts. It is also essential for early retirees — money in a taxable account is accessible immediately with no age restrictions or penalties, making it the bridge that funds spending between early retirement and age 59.5. See Account Type Strategy for Early Retirement for the optimal funding order.
Tax-efficient strategies: Hold tax-efficient index funds and ETFs (low turnover, qualified dividends). Use tax-loss harvesting to offset gains. Use specific-lot identification for cost basis management. Harvest gains in years when your income places you in the 0% long-term capital gains bracket.
| Feature | Details |
|---|---|
| Who qualifies | Any US resident can open a 529 for any beneficiary (child, grandchild, yourself, anyone). There are no income limits or age restrictions. The account owner controls the funds and can change the beneficiary to another family member at any time. |
| Contribution limit | No annual federal limit, but contributions above $18,000 per beneficiary per year (2025) count against the gift tax exclusion. You can front-load 5 years of gifts ($90,000) in a single year. Lifetime limits are state-specific, typically $300,000-$550,000+. |
| Tax treatment | Contributions are not federally deductible (some states offer a state tax deduction). Growth is tax-free. Withdrawals for qualified education expenses (tuition, room, board, books, K-12 tuition up to $10,000/year) are tax-free. |
| Non-qualified withdrawals | Earnings portion taxed as ordinary income + 10% penalty. |
| Roth IRA rollover | Under SECURE 2.0, up to $35,000 lifetime can be rolled from a 529 to the beneficiary's Roth IRA (the 529 must have been open for 15+ years, subject to annual Roth IRA contribution limits). |
Best for: Parents, grandparents, and anyone saving for education expenses. The tax-free growth is substantial over 18 years. The SECURE 2.0 Roth rollover provision adds a safety valve — if the beneficiary does not need the money for education, a portion can become retirement savings. Overfunding a 529 is less risky than it used to be.
| Feature | Details |
|---|---|
| Who qualifies | Any adult can open a custodial account for any minor. The minor is the legal owner of the assets. UGMA (Uniform Gifts to Minors Act) is available in all states; UTMA (Uniform Transfers to Minors Act) is available in most states and allows a broader range of asset types. |
| Contribution limit | None, but contributions above the annual gift tax exclusion ($18,000 per donor per recipient in 2025) require a gift tax return. |
| Tax treatment | The minor's tax rates apply. Under the "kiddie tax" rules, the first $1,300 of unearned income is tax-free, the next $1,300 is taxed at the child's rate, and amounts above $2,600 are taxed at the parent's marginal rate (2025 figures). |
| Control | The custodian manages the account until the minor reaches the age of majority (18 for UGMA, 18-25 for UTMA depending on the state), at which point the assets transfer irrevocably to the child. |
| Financial aid impact | Counted as a student asset on FAFSA, assessed at up to 20% (compared to 5.64% for parent assets). This significantly reduces financial aid eligibility. |
Best for: Gifts to minors when a 529's education restriction is too narrow. Useful for teaching children about investing. Be aware: once the child reaches the age of majority, the money is legally theirs to spend on anything. If education funding is the goal, a 529 is almost always superior due to better tax treatment and parental control.
| Feature | Details |
|---|---|
| Who qualifies | Any US resident. Savings bonds (Series I and EE) are available to US citizens, residents, and civilian employees of the US government. |
| Contribution limit | $10,000/year per person in Series I Bonds (plus up to $5,000 via tax refund). No limit on bank savings, CDs, or money market accounts. |
| Tax treatment | Interest from savings accounts, CDs, and most bonds is taxed as ordinary income. Series I and EE bond interest can be deferred until redemption. I Bond interest used for qualified education expenses may be tax-free (income limits apply). |
Best for: Emergency funds (3-6 months of expenses), short-term savings goals, and capital preservation. These are not growth vehicles — their role is safety and liquidity. I Bonds are particularly useful as an inflation-protected component of an emergency fund (after the 1-year holding period).
No single account type is sufficient. The optimal approach is to maintain a combination that gives you tax diversification (some money taxed now, some taxed later, some never taxed) and access diversification (some money accessible now, some only in retirement).
| Stage | Priority accounts |
|---|---|
| First job | 401(k) to employer match, then Roth IRA, then increase 401(k) |
| Mid-career, higher income | Max 401(k) (traditional), Backdoor Roth IRA, HSA if eligible, then taxable brokerage |
| Self-employed | Solo 401(k) or SEP IRA, Roth IRA (backdoor if needed), HSA if eligible |
| Approaching retirement | Ensure sufficient taxable/Roth assets for early access; begin Roth conversion planning |
| Parents | Add 529 once retirement accounts are on track — never fund education at the expense of retirement |
| Goal | Best accounts |
|---|---|
| Retire at 65 | 401(k) + IRA + HSA |
| Retire before 59.5 | All of the above PLUS substantial taxable brokerage account for the bridge years. See Account Type Strategy for Early Retirement. |
| Save for a child's education | 529 (primary), UGMA/UTMA (supplemental) |
| Build an emergency fund | High-yield savings, I Bonds, Roth IRA contributions (last resort) |
| Maximize lifetime tax savings | Tax-diversified mix of Traditional, Roth, and taxable accounts, with strategic Roth conversions in low-income years |