A capital accumulation plan is an employer-sponsored retirement savings arrangement where your future benefit depends on how much money goes into your account and how well the investments perform. The familiar names are 401(k), 403(b), and 457(b). Instead of promising a fixed monthly pension, the plan puts investment risk on you in exchange for tax advantages, portability between jobs, and control over how your money is invested. In 2026, you can defer up to $24,500 of your salary into most of these plans, with higher ceilings if you are 50 or older.
The Plans That Fall Under This Umbrella
Every capital accumulation plan is a defined contribution plan. The employer commits to putting money in; it does not guarantee a specific retirement income. Your balance at retirement reflects contributions plus market performance, nothing more. Traditional pensions work the opposite way, with the employer bearing investment risk and owing you a promised amount regardless of returns.
The 401(k) is the most widespread version and is available to employees of for-profit businesses. A 403(b) covers employees of public schools, churches, and organizations tax-exempt under Section 501(c)(3).1Internal Revenue Service. IRC 403(b) Tax-Sheltered Annuity Plans A 457(b) is offered to state and local government workers along with certain tax-exempt employers.2Internal Revenue Service. IRC 457(b) Deferred Compensation Plans Profit-sharing plans and money purchase pension plans also fall into this category, though those are funded mostly or entirely by the employer rather than through your paycheck.
Most private-sector plans operate under the Employee Retirement Income Security Act of 1974 (ERISA), which requires plan administrators to manage the plan for participants’ benefit and to explain how it works in plain language.3U.S. Department of Labor. Employee Retirement Income Security Act (ERISA) Government and church plans follow a somewhat different regulatory path, but the mechanics are the same: money goes in, gets invested, grows, and comes out when you retire or leave.
How Much You (and Your Employer) Can Put In
The IRS adjusts contribution ceilings each year. For 2026, the elective deferral limit for 401(k), 403(b), and governmental 457(b) plans is $24,500.4Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 That is the total you can defer from your paycheck across all plans of the same type in a year.
If you are 50 or older by the end of the calendar year, you can add a catch-up contribution of $8,000, taking your personal deferral ceiling to $32,500. A larger catch-up of $11,250 applies if you turn 60, 61, 62, or 63 during the year, letting those participants defer up to $35,750.4Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Total additions to your account from all sources, including your deferrals plus any employer match or profit-sharing, cannot exceed $72,000 in 2026, or $80,000 with the age-50 catch-up.5Internal Revenue Service. IRS Notice 2025-67 – 2026 Amounts Relating to Retirement Plans and IRAs
Employer Matching
Most employers match a portion of what you defer. A common formula is 50 cents per dollar up to 6% of your salary, but formulas vary. Some employers instead make non-elective contributions, depositing a flat percentage of pay for every eligible worker whether they defer anything or not. Either way, this is money you would not otherwise receive, and contributing at least enough to capture the full match is one of the highest-return decisions in personal finance.
Vesting
Your own salary deferrals are 100% yours the moment they hit the account. Employer contributions often come with a vesting schedule, meaning you have to stay for a set period before you fully own that portion. Federal law caps the schedule at three years for cliff vesting (0% to 100% at once) or six years for graded vesting, which must reach at least 20% after two years and 100% after six.6U.S. Department of Labor. FAQs About Retirement Plans and ERISA If you leave before you are fully vested, you forfeit the unvested employer money. Check your vesting percentage before you change jobs.
Traditional Versus Roth Contributions
Capital accumulation plans offer two tax paths, and the one you pick decides when you pay tax on the money.
Traditional contributions come out of your paycheck before income tax is calculated, reducing your taxable income for the year. Earn $80,000 and defer $10,000, and you pay federal income tax on $70,000. The investments grow untaxed year to year. When you take money out in retirement, you owe ordinary income tax on every dollar, both contributions and gains. The premise is that your tax rate then will be lower than it is now.
Roth contributions work in reverse. You pay income tax on the money in the year you contribute, so there is no upfront break. In exchange, both the contributions and all the growth come out completely tax-free in retirement, provided you have held the Roth account for at least five years and are 59½ or older.7Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions For someone early in their career who expects to earn more later, the Roth path often comes out ahead.
The right choice depends on whether your tax rate will be higher or lower when you start drawing. Nobody knows that with certainty, and splitting contributions between both is a reasonable hedge.
Getting the Money Back Out
The money is meant for retirement, and the tax code enforces that. Distributions taken before age 59½ are subject to ordinary income tax plus an additional 10% early withdrawal penalty.7Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions After 59½, traditional distributions are taxable but no longer penalized.
A handful of exceptions waive the 10% penalty even if you are younger. If you leave your employer during or after the year you turn 55, distributions from that employer’s plan are penalty-free (age 50 for qualifying public safety employees).8Internal Revenue Service. Topic No. 558, Additional Tax on Early Distributions From Retirement Plans Other Than IRAs You can also set up substantially equal periodic payments calculated over your life expectancy, penalty-free as long as you maintain the schedule for at least five years or until 59½, whichever is later.9Internal Revenue Service. Substantially Equal Periodic Payments Unreimbursed medical expenses above 7.5% of your adjusted gross income also qualify.
Required Minimum Distributions
Once you reach age 73, the IRS requires you to start pulling a minimum amount each year from traditional accounts so the tax-deferred money finally gets taxed.10Internal Revenue Service. Retirement Plan and IRA Required Minimum Distributions FAQs The amount is your account balance divided by an IRS life expectancy factor. Missing an RMD triggers a 25% excise tax on the shortfall, dropping to 10% if you correct it within the allowed window.11Office of the Law Revision Counsel. 26 USC 4974 – Excise Tax on Certain Accumulations in Qualified Retirement Plans Roth 401(k) accounts had been subject to RMDs, but designated Roth accounts in employer plans are exempt starting in 2024, matching how Roth IRAs work. Under SECURE 2.0, the RMD age rises again to 75 in 2033.
Loans and Hardship Withdrawals While You Are Still Working
Most plans offer two ways to reach the money before retirement without triggering a permanent distribution: loans and hardship withdrawals. Neither is ideal.
A plan loan lets you borrow up to 50% of your vested balance or $50,000, whichever is less, and repay it with interest back into your own account. Repayment happens in substantially level installments, at least quarterly, over no more than five years, with a longer window allowed if the loan buys your primary residence.12Internal Revenue Service. Fixing Common Plan Mistakes – Plan Loan Failures and Deemed Distributions Miss a payment and the outstanding balance becomes a taxable distribution, potentially with the 10% penalty if you are under 59½.13Internal Revenue Service. Deemed Distributions – Participant Loans The hidden cost is what your borrowed money would have earned if it had stayed invested. You also repay with after-tax dollars that will be taxed again on withdrawal.
Hardship withdrawals cannot be repaid. The IRS lists expenses that automatically qualify as an immediate and heavy financial need: medical costs for you, your spouse, dependents, or a plan beneficiary; expenses tied to buying your primary residence; tuition, fees, and room and board for the next 12 months of postsecondary education; payments to prevent eviction or foreclosure on your principal residence; funeral costs for close family; and certain home repair expenses. The distribution is taxable and may still trigger the 10% early withdrawal penalty.14Internal Revenue Service. Retirement Topics – Hardship Distributions Not every plan offers this option; it depends on the plan document.
What Happens When You Leave the Job
The account does not have to stay with your former employer. You can roll it into your new employer’s 401(k), a 403(b), a governmental 457(b), or a traditional IRA. Pre-tax money from any of these plan types can generally move into any of the others.15Internal Revenue Service. Rollover Chart
A direct rollover moves the money from the old plan to the new account without ever passing through your hands. Nothing is withheld and nothing is at risk of becoming taxable. Use this option whenever possible.16Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
An indirect rollover sends the check to you. The old plan withholds 20% for federal taxes, and you have 60 days to deposit the full original amount into the new account, which means covering that withheld 20% out of pocket until you get it back at tax time. Miss the 60-day window and the whole amount is a taxable distribution, plus the 10% penalty if you are under 59½.16Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions The IRS can waive the deadline in narrow situations like serious illness or a financial institution’s error, but a waiver is not something to plan around.
Your Rights as a Participant
ERISA imposes fiduciary duties on anyone who runs the plan or manages its assets. Fiduciaries must act prudently, offer a reasonable investment lineup, and keep fees in check. The standard is not perfection but the care a knowledgeable person in a similar role would exercise. Breaches of this duty, such as filling a plan with expensive proprietary funds that benefit the employer, have produced some of the largest retirement plan lawsuits in recent years.
You are entitled to a Summary Plan Description that spells out eligibility, contribution formulas, vesting, and claims procedures in language you can follow.17U.S. Department of Labor. Plan Information If anything about your plan looks wrong, that document is the first thing to read. Plan administrators must provide it at no charge, and the Department of Labor can impose penalties for refusal or delay.