Account Placement: 401(k) vs IRA

Quick definition: Account placement is the strategic distribution of your three funds across different account types—employer 401(k), traditional IRA, Roth IRA, and taxable brokerage—to minimize lifetime taxes and maximize tax-advantaged compound growth.

Key Takeaways

• Employer 401(k) plans offer immediate tax deductions, employer matching, and high contribution limits; they should be your first investment destination to capture free employer money
• Traditional IRAs and Roth IRAs provide tax-advantaged growth and contribution room beyond your 401(k), with different timing of tax benefits
• Taxable brokerage accounts lack tax advantages but offer unlimited contribution capacity and flexibility; they serve as overflow for savings exceeding 401(k) and IRA limits
• Tax-efficient fund placement within accounts—putting high-turnover or high-income funds in tax-advantaged accounts and tax-efficient funds in taxable accounts—can reduce lifetime taxes by thousands
• The priority order for investing new savings should be: capture 401(k) match, max out 401(k), max out IRA, then invest in taxable brokerage

The Three Account Categories

Before discussing placement strategy, it is important to understand the three categories of accounts available to most investors:

Tax-advantaged accounts with employer access: 401(k) and similar employer-sponsored plans (403(b), 457) allow you to contribute pre-tax earnings up to annual limits (currently $23,000 per year for those under 50), receive employer matching (often 3% to 6% of salary), and invest in tax-deferred growth until retirement. These accounts are extraordinarily valuable because they combine immediate tax deductions, free employer money, and tax-deferred compounding.

Tax-advantaged accounts for individuals: Traditional IRAs and Roth IRAs allow annual contributions (currently $7,000 per year for those under 50) in tax-deferred or tax-free accounts, respectively, without requiring employer involvement. Traditional IRAs offer immediate tax deductions but require taxes on withdrawals. Roth IRAs offer no immediate deduction but provide tax-free withdrawals in retirement.

Taxable brokerage accounts: Regular investment accounts without tax advantages, but with unlimited contribution capacity. Dividends and capital gains are taxable each year, but withdrawals are flexible and unlimited.

Priority Order: Capturing Employer Matching

The first priority for investing new savings is capturing your employer's 401(k) match. If your employer offers a 4% match on 401(k) contributions, contributing at least 4% of your salary captures an immediate 4% return on your money—essentially free money. This is the highest-guaranteed return available to virtually any investor and should not be left on the table.

Once you are capturing the full employer match, the priority becomes maxing out your 401(k) contribution. At $23,000 per year (or $30,500 at age 50+), this is a substantial contribution, but most savers should prioritize it ahead of other savings because of the tax deduction. A $23,000 contribution deduction saves approximately $5,750 to $6,900 in federal income taxes (assuming a 25% to 30% tax bracket), meaning your true cost of saving is only $16,100 to $17,250.

The 401(k): Employer Sponsorship and Matching

An employer 401(k) is typically the most powerful wealth-building tool available to employees. The three key advantages are:

Immediate tax deduction: Contributing $23,000 to a 401(k) reduces your taxable income by $23,000, saving 25% to 35% in federal taxes (depending on your bracket) plus state taxes. This immediate tax savings makes saving far more affordable than it first appears.

Employer matching: Most employers offering 401(k) plans provide matching contributions, typically 3% to 6% of salary. If your employer offers a 4% match and you contribute 4% of a $100,000 salary ($4,000), your employer adds another $4,000, immediately doubling your contribution. This free money is the single largest boost most employees will receive.

Tax-deferred growth: The investment growth within the 401(k) is not taxed each year. A fund that earns 10% compounds at 10% annually inside a 401(k), whereas the same fund in a taxable account would be taxed on gains and dividends each year, reducing growth to perhaps 8% after taxes. Over 40 years, this difference compounds substantially.

The disadvantages of 401(k)s include limited investment choices (you can only invest in funds your plan offers), early withdrawal penalties (if you need the money before age 59.5, you pay 10% penalty plus income taxes), and less control over fees (employer plans sometimes offer higher-cost funds than you could access independently).

Traditional IRA: Tax Deduction Now, Taxes Later

A traditional IRA allows you to contribute up to $7,000 annually ($8,000 at age 50+) and deduct that amount from your taxable income if you are not covered by an employer 401(k). If you are covered by a 401(k), the deduction phases out at higher incomes, but the account remains available for non-deductible contributions that can be converted to Roth IRAs (the "backdoor Roth" strategy).

The traditional IRA is useful when you max out your 401(k) but want additional tax-deferred growth. You get a tax deduction now and defer taxes until retirement when you withdraw. If your tax bracket is lower in retirement than during your working years, this strategy saves taxes overall.

Traditional IRAs have the same early withdrawal restrictions as 401(k)s (10% penalty before age 59.5) and require minimum distributions after age 73, which can cause tax problems for those with very large accounts.

Roth IRA: No Tax Deduction Now, Tax-Free Withdrawals Later

A Roth IRA allows you to contribute up to $7,000 annually ($8,000 at age 50+) without an immediate tax deduction. Instead, the account grows tax-free and all withdrawals are tax-free in retirement. Roth IRAs also allow penalty-free withdrawal of contributions (not earnings) in emergencies, and there are no required minimum distributions in your lifetime, making them ideal for leaving money to heirs.

Roth IRAs are particularly valuable for young, low-income earners. If you are in the 12% tax bracket now but expect to be in the 24% bracket in retirement, a Roth IRA is superior to a traditional IRA because you lock in the low tax rate now.

One limitation of Roth IRAs is that direct contributions are not allowed if your income exceeds certain thresholds (approximately $146,000 for single filers in 2024). However, the "backdoor Roth" strategy—contributing to a traditional IRA and immediately converting it to a Roth IRA—allows higher earners to fund Roth IRAs regardless of income.

Taxable Brokerage Accounts: Flexibility and Unlimited Contribution

Once you have maxed out your 401(k) ($23,000) and IRA ($7,000), your total tax-advantaged capacity is $30,000 per year. Any additional savings must go into a taxable brokerage account. Taxable accounts lack tax advantages but offer unlimited contribution capacity and complete flexibility. You can withdraw any amount at any time without penalties, and you can transfer funds between custodians easily.

The main disadvantage of taxable accounts is that investment gains and dividends are taxed annually. If a fund earns 10% but generates 2% in taxable distributions, you pay tax on 12% of growth even though you did not sell any shares. This tax drag reduces after-tax returns by perhaps 0.5% to 2% per year depending on fund selection and tax bracket.

However, taxable accounts are essential for most serious savers because tax-advantaged accounts have limited capacity. A household with $100,000 annual savings capacity can only shelter $30,000 to $40,000 (if both spouses have 401(k)s and IRAs) in tax-advantaged accounts, necessitating $60,000 to $70,000 in taxable accounts anyway.

Asset Location Strategy: Placing Funds in Appropriate Accounts

Once you understand the account types, the next optimization is asset location—deciding which funds to hold in which accounts. The principle is straightforward: hold high-tax-drag investments in tax-advantaged accounts and tax-efficient investments in taxable accounts.

In a 3-fund portfolio, the relative tax efficiency is:

US total market index fund: Moderate tax efficiency. Holds thousands of stocks, so the fund rarely forces realized capital gains. Dividend yield is typically 1.5% to 2%, creating annual tax drag in taxable accounts. This fund is reasonably suitable for taxable accounts but can also go in tax-advantaged accounts.

International stock fund: Moderate to poor tax efficiency. Holds many stocks and some bonds within emerging markets components. International funds generate somewhat higher turnover and occasionally significant foreign dividend distributions. These are better held in tax-advantaged accounts than in taxable accounts.

Bond fund: Worst tax efficiency. Bond interest income is ordinary income, taxed at high ordinary rates (up to 37% federal for high earners), making bond funds the single worst fund type for taxable accounts. Bond funds should be held exclusively or primarily in tax-advantaged accounts.

Based on this analysis, a sample asset location strategy for a married couple with a moderate 60/40 stock-to-bond allocation might look like:

401(k) accounts (for both spouses, total $46,000 capacity): Hold all bond funds here (20% to 25% of total portfolio). Bonds generate high-tax-drag in taxable accounts, so prioritize holding them tax-sheltered. If your 401(k) cannot accommodate all bond funds, hold your international stock fund in the 401(k) as well.

IRA accounts (for both spouses, total $14,000 to $16,000 capacity): Hold remaining bond funds if they did not fit in 401(k), or hold international stocks.

Taxable brokerage account: Hold US total market index fund, which is the most tax-efficient of your three funds. Save your worst-case scenario—holding bonds in a taxable account—for only when you have no other room.

This strategy ensures that tax-inefficient investments receive tax protection while tax-efficient investments remain accessible and flexible in taxable accounts.

Tax Loss Harvesting in Taxable Accounts

One advantage of taxable accounts is the ability to harvest tax losses. If your US stock fund falls in value—say, from $20,000 to $17,000—you can sell it, recognize the $3,000 capital loss (deductible against capital gains or up to $3,000 of income), and immediately buy a nearly identical fund (different fund family, same index) to maintain your target allocation. This practice, tax loss harvesting, can save hundreds or thousands in taxes over a career while maintaining your investment strategy.

Tax loss harvesting is not available in IRAs or 401(k)s because gains and losses in those accounts are not taxable events. This is another reason to maintain some allocation in taxable accounts once they exceed a certain size.

Coordinating Allocation Across All Accounts

When you have multiple accounts, your overall 3-fund allocation should reflect your target across all accounts combined, not within each account individually. If you target 60% stocks and 40% bonds, and you have $200,000 total ($100,000 in 401(k), $50,000 in IRA, $50,000 in taxable), you should hold:

• Total stocks: $120,000 across all accounts
• Total bonds: $80,000 across all accounts

The breakdown across accounts might be:

• 401(k): $40,000 stocks + $60,000 bonds
• IRA: $30,000 stocks + $20,000 bonds
• Taxable: $50,000 stocks + $0 bonds

This coordination ensures your true risk exposure matches your target, even though individual accounts have different mixes.

Decision tree

Next

With your account structure and fund placement decided, the final step is implementing tax-efficient fund selection and understanding how to minimize lifetime taxes through thoughtful placement decisions, explored in Tax-Efficient Fund Placement.