How a defined contribution plan works
The contribution is defined; the outcome is not. You choose a share of each paycheck to defer, pre-tax or, if the plan offers it, as Roth, and your employer may add a match or a fixed contribution. The money goes into an account in your name, you pick investments from the plan’s menu, and the balance rises or falls with those investments, minus fees.
Because the account is yours, vested money can move to a new employer’s plan or an IRA when you leave. The flip side is that you carry the risks a defined benefit plan would carry for you: poor markets, high costs and outliving the money. In March 2025, the Bureau of Labor Statistics found that 70% of private-industry workers had access to a defined contribution plan, five times the share with access to a pension.
Newer plans enroll you by default. Under SECURE 2.0, most 401(k) and 403(b) plans set up after December 29, 2022 must, for plan years beginning after 2024, automatically enroll eligible employees at 3% to 10% of pay and raise the rate 1 point a year to at least 10%. Existing plans, very small or new businesses, and government and church plans are exempt.
Common types of defined contribution plans
All defined contribution plans use individual accounts, but they differ in who can offer them, who contributes and which limits apply. Your employer’s type largely decides which one you get: a company offers a 401(k), a public school or hospital often a 403(b), and a state or city a 457(b), sometimes alongside a pension. Each type has its own rules for catch-ups, withdrawals and rollovers, but all of them leave the investment results to you.
- 401(k): the standard private-sector plan, funded mainly by employee deferrals plus any employer match.
- 403(b): the equivalent for public schools, hospitals and other tax-exempt employers.
- 457(b): a deferred compensation plan for state and local governments, and some nonprofits, with its own deferral limit.
- Thrift Savings Plan: the plan for federal employees and the uniformed services.
- Profit-sharing and money purchase plans: employer-funded accounts, discretionary or fixed.
- Employee stock ownership plans: accounts invested mainly in the employer’s own stock.
- Solo 401(k), SEP IRA and SIMPLE IRA: simpler individual-account options for the self-employed and small employers.
2026 contribution limits and vesting
Federal law caps what can go into these accounts each year, and the contribution limits are indexed for inflation. The employee deferral limit is shared across all 401(k), 403(b) and Thrift Savings Plan accounts you have, while a governmental 457(b) has a separate limit of the same size. Your own deferrals are always 100% vested, and so is all money in a SEP or SIMPLE IRA. In other plans, employer money can follow a vesting schedule no slower than a three-year cliff or a six-year graded schedule that vests 20% a year from year two.
- Employee deferrals: $24,500 for 2026.
- Age-50 catch-up: $8,000 more, or $11,250 in the years you turn 60 through 63.
- Total additions from you and your employer: $72,000, not counting catch-ups.
- Pay that can count toward contributions: the first $360,000.
- Catch-ups for workers whose prior-year FICA wages from the employer topped $150,000 must go in as Roth from 2026.
Defined contribution vs. defined benefit: pros and cons
The two designs answer the same question in opposite ways. A defined benefit plan fixes the income and leaves the employer to fund it. A defined contribution plan fixes the input and leaves the income to you: how much you save, how you invest and how fast you spend it later. Neither is simply better, and the table below lines up the rules.
Fees deserve special attention because they compound. The Department of Labor shows that on a $25,000 balance growing 35 years at 7%, paying 1.5% a year in fees instead of 0.5% leaves the account 28% smaller at retirement.
- Pro: you own the account, so vested money moves with you when you change jobs and can pass to heirs.
- Pro: you choose how much to save, how to invest and, in many plans, whether to use Roth or pre-tax money.
- Con: nothing is promised; weak markets, high fees or saving too little all shrink the result.
- Con: the balance is not an income, so you carry the risk of outliving it unless you buy an annuity with part of it.
- Con: easy access tempts people to cash out when they change jobs, losing years of tax-deferred growth.
Withdrawals, rollovers and RMDs
A defined contribution plan pays out a balance, not an income, so in retirement you turn that balance into a paycheck yourself. You can leave it invested and draw on it at a sustainable rate, convert part of it to lifetime income, or move it to an IRA. A distribution paid to you has 20% federal tax withheld even if you plan to roll it over, so a direct transfer is simpler.
Withdrawals before 59½ usually owe a 10% additional tax on top of income tax, but the rule of 55 waives it if you leave the employer in or after the year you turn 55. Required minimum distributions begin at 73 for most people born 1951–1959 and at 75 for those born in 1960 or later. If you still work for the employer and are not a 5% owner, the plan can let you wait until you retire. Roth accounts inside the plan owe no RMDs during your life.
Illustrative numbers
Thirty years of contributions at two net returns
- B
- Current account balance
- C
- Yearly contributions from you and your employer
- r
- Annual return after fees
- n
- Years until retirement
This assumes level yearly contributions and a steady return; real balances move with markets and pay raises.
Employee deferral, 10% of $80,000 salary$8,000 a year
Employer contribution, 4% of salary$3,200 a year
Years of contributions, starting from $030
Balance at a 6% net annual returnabout $885,000
Balance at a 5% net annual returnabout $744,000
The same $11,200 a year ends about $141,000, or 16%, apart because of one percentage point of return, whether lost to fees or to a more cautious mix. Neither balance is promised. If the employer’s share is a 401(k) match, deferring too little to earn all of it lowers every figure above.
At a glance
Defined contribution vs. defined benefit plans (2026)
| Feature | Defined contribution plan | Defined benefit plan |
|---|---|---|
| What is promised | Nothing beyond the account balance | A set benefit, usually monthly for life |
| Who funds it | Employee deferrals, often plus employer money | Mainly the employer; many public plans add employee contributions |
| Investment risk | The employee | The employer |
| Risk of outliving the money | The employee, unless the balance buys an annuity | Pooled by the plan |
| Federal insurance | None; PBGC does not insure these plans | PBGC for most private-sector plans |
| 2026 federal limit | $72,000 of total additions a year | $290,000 annual benefit |
| Employer money vests within | 3 years (cliff) or 6 years (graded) | 5 years (cliff) or 7 years (graded) |
| When you change jobs | Vested balance can roll to an IRA or new plan | Benefit usually waits in the plan until retirement age |
Put it in your plan
DC plan in MoneyWhatIf
In MoneyWhatIf, each workplace account records its balance, tax treatment and contributions, with your own contribution kept separate from the employer’s. The plan fits contributions to a 2026 rule snapshot, including $24,500 of employee deferrals, $72,000 of total additions under 50 and the age 60–63 higher catch-up, and scales after-tax requests down together when take-home pay cannot cover them. A match written as “50% of the first 6% of pay” pays the 3% of pay it promises. The 2026 rule that some higher earners’ catch-ups must be Roth is not modeled.
Common questions
DC plan FAQs
Is a 401(k) a defined contribution plan?
Yes. A 401(k) is the most common defined contribution plan: you defer part of your pay into an account in your name, your employer may add money, and your balance depends on contributions and investment results. A 403(b), the Thrift Savings Plan and profit-sharing plans work the same way, while a traditional pension does not.
What happens to my defined contribution plan when I leave my job?
Your own contributions and any vested employer money stay yours. You can usually leave the account in the old plan, move it to your new employer’s plan, or roll it into an IRA with a direct transfer. Cashing out is also possible, but it is taxed as income and, before 59½, usually adds a 10% additional tax. Unvested employer contributions are forfeited.
Is Social Security a defined contribution plan?
No. Social Security works more like a defined benefit plan: your benefit comes from a formula based on up to 35 years of your highest indexed earnings and the age you claim, not from an account balance. The payroll tax you pay goes to the program’s trust funds, not to an account in your name. It is a government program, so ERISA and PBGC do not apply.
What is the difference between a defined contribution plan and an IRA?
A defined contribution plan is sponsored by an employer, allows larger contributions ($24,500 of deferrals for 2026) and can include employer money. An IRA is opened by you, holds only $7,500 for 2026 plus a $1,100 catch-up from age 50, and usually offers a wider choice of investments. The rule of 55 applies to workplace plans but not to IRAs.