Yes, you can use your 401k to invest in stocks. Most plans give you stock exposure through mutual funds and index funds chosen by the plan administrator, and roughly one in four plans goes further by offering a self-directed brokerage account that lets you buy shares of specific companies. Which route is available to you depends entirely on the rules your employer’s plan has adopted. Either way, trades inside the 401k grow tax-deferred: you owe no capital gains tax when you buy or sell within the account, though withdrawals in retirement are taxed as ordinary income.
Stock Exposure Through Your Plan’s Fund Menu
Most 401k participants invest in stocks indirectly, through mutual funds or index funds on the plan’s investment menu. A single fund purchase typically spreads your money across dozens or hundreds of companies. Your plan’s menu usually includes several equity options, such as a large-company index fund, an international stock fund, or a target-date fund that gradually shifts from stocks to bonds as you approach retirement.
Expense ratios matter more than most participants realize. Each fund deducts an annual percentage from assets to cover management and administration. A Department of Labor analysis shows equity fund expense ratios in 401k plans ranging from roughly 0.18% for a basic index fund to over 2% for actively managed funds.1Department of Labor. A Look at 401(k) Plan Fees An industry survey put the average expense ratio participants actually paid on equity mutual funds at 0.26% as of 2024.2Investment Company Institute. Mutual Fund Expense Ratios Remain at Historic Lows for Retirement Savers Over a 30-year career, even a fraction of a percentage point can shave tens of thousands of dollars off your ending balance, so comparing expense ratios across your options is worth the time.
Buying Individual Stocks Through a Brokerage Window
To buy shares of a specific company rather than a fund that holds it, you need a feature called a self-directed brokerage account, sometimes called a brokerage window. It expands your menu beyond the plan’s preset funds to include individual stocks, exchange-traded funds, and often bonds and additional mutual funds. Not every plan offers one. Industry surveys show roughly 20 to 40 percent of 401k plans make a brokerage window available, depending on plan size and provider.3Department of Labor. Understanding Brokerage Windows in Self-Directed Retirement Plans
To find out whether yours does, check your Summary Plan Description, the document that spells out your plan’s rules, options, and restrictions.4U.S. Department of Labor. FAQs About Retirement Plans and ERISA You can usually pull it from your plan’s online portal or request it from HR. If the plan does allow a brokerage window, the SPD will also set out what you can invest in and how much of your balance you can move to the brokerage side.
Who Bears the Investment Risk
When you pick individual stocks through a brokerage window, the investment risk is yours, not the plan administrator’s. Under ERISA, plan fiduciaries are normally responsible for prudently selecting and monitoring investments. When a plan lets participants direct their own investments, ERISA Section 404(c) generally shields the plan fiduciary from liability for losses that result from your choices.3Department of Labor. Understanding Brokerage Windows in Self-Directed Retirement Plans In practice, most fiduciaries do not monitor individual brokerage window holdings the way they monitor the core fund lineup. If a stock you picked drops, there is no fiduciary backstop.
Opening and Funding the Brokerage Side
If your plan offers a brokerage window, you complete election forms to open the brokerage account and link it to your existing 401k balance. The forms typically ask for your plan identification number and verification of your employment status. You then specify how much of your core balance to transfer, either as a dollar amount or a percentage.
Most plans set rules around these transfers. Minimums vary; some providers require as little as $500 to open the brokerage account. Many plans also cap how much of your total balance can sit in the brokerage window, with 50% and 95% being common limits.3Department of Labor. Understanding Brokerage Windows in Self-Directed Retirement Plans A smaller number of plans require a minimum balance to remain in the core funds at all times. Once you submit the paperwork, the funds typically appear in the brokerage account within several business days.
Placing a Trade
With the brokerage window funded, you log into the trading platform provided by your plan’s custodian. The interface works much like any online brokerage: enter the ticker symbol, pick an order type (a market order executes at the current price, a limit order caps the price you will pay), and review the trade before confirming. Most major plan providers now charge no commission for online stock and ETF trades, though broker-assisted trades and specialized transactions like options may carry fees.3Department of Labor. Understanding Brokerage Windows in Self-Directed Retirement Plans
Trades do not settle instantly. Since May 2024, the SEC requires most equity trades to follow a T+1 settlement cycle, meaning the transaction finalizes one business day after the trade date.5U.S. Securities and Exchange Commission. SEC Chair Gensler Statement on Upcoming Implementation of T+1 Settlement Cycle Your platform generates a trade confirmation that serves as the official record of execution.6eCFR. 17 CFR 240.10b-10 – Confirmation of Transactions The shares appear as individual holdings within the brokerage portion of your 401k and show up on your quarterly plan statement alongside your other investments.
What You Cannot Buy or Do Inside a 401k
A 401k brokerage window is not the same as a regular brokerage account. Several strategies and investment types are off-limits or heavily restricted.
- Margin trading and short selling involve borrowing, either borrowing money to buy more stock or borrowing shares to sell them. Because a retirement plan account cannot take on debt obligations, nearly all plans prohibit both.
- Many plans restrict or prohibit buying your own employer’s stock through the brokerage window, separate from any employer stock fund already on the plan menu.
- The tax code treats a purchase of collectibles through an individually directed retirement account as an immediate taxable distribution equal to the purchase price. Collectibles include artwork, rugs, antiques, most coins, gems, stamps, and alcoholic beverages. Certain government-minted gold and silver coins and approved bullion held by a qualified trustee are exceptions.7Internal Revenue Service. Investments in Collectibles in Individually Directed Qualified Plan Accounts
- Plans commonly block penny stocks traded on over-the-counter bulletin boards, and municipal bonds, which create tax complications inside a tax-deferred account.
Your plan’s SPD lists its specific restrictions.
Prohibited Transactions
Federal law also bars certain dealings between your 401k and anyone the IRS considers a “disqualified person,” which includes you, your family members, and your employer. Common prohibited transactions include selling property to your plan, borrowing from it outside an approved loan program, or using plan assets for personal benefit — buying artwork through the account and hanging it in your home, for example.8Internal Revenue Service. Retirement Topics – Prohibited Transactions The penalties are steep. A disqualified person who engages in a prohibited transaction owes an excise tax equal to 15% of the amount involved for each year the transaction remains uncorrected. If it still is not corrected within the required period, a second-tier tax of 100% of the amount involved applies, on top of any regular income tax and early distribution penalties.9Office of the Law Revision Counsel. 26 U.S.C. 4975 – Tax on Prohibited Transactions
How Stock Trades Are Taxed Inside the Account
One of the biggest advantages of buying stocks inside a 401k is that individual trades do not trigger taxable events. You can sell a stock at a profit and reinvest the entire gain without owing capital gains tax that year. This tax-deferred compounding is the same whether you hold mutual funds or individual stocks; the 401k wrapper, not the investment type, provides the benefit.10Office of the Law Revision Counsel. 26 U.S.C. 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans
The tax bill arrives when you take money out. Withdrawals from a traditional 401k are taxed as ordinary income, not at the lower capital gains rates, regardless of whether the money came from stock gains, dividends, or your original contributions. For 2026, federal rates on ordinary income run from 10% to 37%, depending on your total taxable income.11Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Most states also tax retirement distributions.
The Early Withdrawal Penalty
If you take money out of your 401k before age 59½, you generally owe an additional 10% tax on top of regular income tax.12Office of the Law Revision Counsel. 26 U.S.C. 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts This applies to anything you pull out early, whether the money was in mutual funds or individual stocks. Exceptions exist, including separation from service during or after the year you turn 55, total and permanent disability, substantially equal periodic payments, distributions to a former spouse under a qualified domestic relations order, unreimbursed medical expenses exceeding 7.5% of your adjusted gross income, and up to $22,000 for a federally declared disaster. The IRS maintains the full list.13Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Even when an exception applies, the withdrawal is still subject to regular income tax; only the 10% add-on is waived.
2026 Contribution Limits
How much you can invest in stocks through your 401k depends partly on how much you can contribute in the first place. For 2026, the IRS sets the elective deferral limit at $24,500, the maximum you can contribute from your own paycheck in a single year. Employer matching dollars do not count against that limit. Workers 50 and older can add an $8,000 catch-up contribution, and workers ages 60 through 63 can add $11,250 under the SECURE 2.0 Act.14Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 These limits apply to your combined contributions whether the money ends up in core funds or in individual stocks through a brokerage window.
What Happens if You Leave Your Job
When you leave an employer, your 401k, including any brokerage window holdings, stays in the plan until you decide what to do with it. Many plans, though, require departing employees to close the brokerage window within a set period, which usually means selling your individual stock positions and moving the proceeds back to the core funds or rolling them out. Some plans allow an in-kind rollover of individual stock positions into an IRA, letting you transfer the actual shares without selling, but this depends on both the sending plan’s rules and the receiving IRA custodian’s capabilities.
If you do nothing, the plan may automatically liquidate your brokerage window holdings and either move the proceeds to a default fund or, for small balances, issue a distribution. A distribution triggers ordinary income tax and possibly the 10% early withdrawal penalty if you are under 59½. Contact your plan administrator before your last day to understand your timeline and your options for rolling the account to an IRA or a new employer’s plan.