Defined contribution plan: how it works and how it differs from a pension

A defined contribution plan is an employer retirement plan in which money is paid into an individual account in your name, and your eventual benefit is whatever that account is worth when you draw on it. The contributions are defined, by you, your employer or both, but the outcome is not: it depends on how much goes in, how the investments perform and what the plan costs. The 401(k) is the best-known example, alongside the 403(b), the governmental 457(b), the federal Thrift Savings Plan and profit-sharing plans.

The contrast is with a defined benefit plan, the traditional pension, where the employer promises a set income in retirement based on a formula and carries the investment risk. This guide explains how defined contribution plans work, the main types, the rules on contributions, vesting and withdrawals, and how the two designs compare. It uses no current-year dollar limits, because the IRS adjusts them each year.

How a defined contribution plan works

The mechanics are simple once you separate the stages.

1. Contributions go in. You may choose to defer part of your salary, either pre-tax (traditional) or after-tax (Roth, where the plan offers it). Your employer may add matching or non-elective contributions.
2. You choose the investments. Most plans offer a menu of funds, often including target-date funds, index funds and a stable value or money market option. If you do not choose, your money usually goes into the plan's default investment.
3. The account grows or shrinks. Investment returns, positive or negative, and plan fees are applied to your account. Nothing is guaranteed by the employer.
4. You draw on it. In retirement you take withdrawals, roll the money to an IRA, buy an annuity, or a combination. Required minimum distributions start at the age set by law.

The key feature is that the account belongs to you, subject to vesting. If you change jobs, the vested balance goes with you, either left in the old plan, rolled to the new employer's plan or rolled to an IRA.

The main types of defined contribution plan

Plan	Typical employer	Notes
401(k)	Private-sector employers	Employee deferrals plus optional employer contributions; may offer a Roth option
403(b)	Public schools, hospitals, charities	Similar to a 401(k); older plans may hold annuity contracts
Governmental 457(b)	State and local governments	Its own deferral limit; withdrawals on leaving service are not subject to the 10% additional tax
Thrift Savings Plan (TSP)	Federal employees and the military	Low-cost index funds; its own withdrawal rules
Profit-sharing plan	Any employer	Employer contributions, often discretionary from year to year
Money purchase pension plan	Any employer	Employer must contribute a fixed percentage each year
ESOP	Companies sharing ownership	Invests primarily in employer stock
SIMPLE IRA and SEP IRA	Smaller employers	IRA-based plans; lighter administration

Our guide to the 403(b) plan covers the nonprofit and public-school version in more detail. Many employers combine features, for example a 401(k) with a profit-sharing component.

Contributions and the annual limits

Two separate federal limits apply to most of these plans:

• The elective deferral limit, under IRC §402(g), caps how much you can defer from your own pay into 401(k), 403(b) and similar plans in a year. It is a per-person limit across all your plans, not per employer. Governmental 457(b) plans have a separate limit.
• The annual additions limit, under IRC §415(c), caps the total of your deferrals, employer contributions and any forfeitures allocated to your account in one plan for the year.

People above a certain age can make additional catch-up contributions, and SECURE 2.0 introduced a higher catch-up amount for a narrow age band and a requirement for some higher earners to make catch-ups on a Roth basis. All of these figures change each year. Check the IRS's current-year retirement plan limits page rather than relying on a number quoted elsewhere.

Employer contributions come in a few common forms: a match (for example, a percentage of what you defer, up to a cap), a non-elective contribution paid to all eligible employees whether or not they defer, and profit-sharing contributions that may vary year to year. The plan document sets the formula.

Vesting: what you keep if you leave

Your own deferrals are always 100% vested. Employer contributions can be subject to a vesting schedule, which means you earn the right to them over time. For defined contribution plans, federal law allows employers to use either:

• A cliff schedule, where you become fully vested after no more than three years of service, or
• A graded schedule, where vesting builds up gradually and reaches 100% after no more than six years.

Employers can be more generous than this, and some vest immediately. Certain safe harbor contributions must be fully vested. If you leave before you are fully vested, the unvested part is forfeited and goes back to the plan. Our guide to 401(k) vesting explains how years of service are counted.

How defined contribution plans are taxed

The tax treatment depends on whether you contribute on a traditional or Roth basis.

Traditional (pre-tax) contributions reduce your taxable wages in the year you make them, although Social Security and Medicare taxes still apply. Growth is tax-deferred. Withdrawals are taxed as ordinary income.

Roth contributions are made from after-tax pay. Qualified withdrawals, including the growth, are tax-free once the five-year and age (or disability or death) conditions are met. Since 2024, designated Roth accounts in workplace plans are no longer subject to lifetime required minimum distributions for the original owner.

Employer contributions have traditionally been made on a pre-tax basis. SECURE 2.0 allows plans to let employees elect to receive matching or non-elective contributions as Roth, in which case they are included in the employee's income for the year.

Withdrawals taken before age 59½ are generally subject to a 10% additional tax on the taxable amount unless an exception applies, such as separation from service in or after the year you turn 55 for 401(k) and 403(b) plans. Governmental 457(b) plans are not generally subject to the 10% additional tax on distributions after you leave the employer.

Taking money out in retirement

When you retire or leave the employer, you usually have several options:

• Leave the money in the plan, if the balance meets the plan's minimum, and draw on it according to the plan's withdrawal options
• Roll it to an IRA, which often gives a wider investment choice; a direct rollover avoids mandatory 20% federal withholding
• Roll it to a new employer's plan, if that plan accepts rollovers
• Take a lump sum, which is fully taxable for pre-tax money in the year received
• Buy an annuity, either through an in-plan option or by rolling to an IRA and purchasing one there

Our 401(k) rollover guide covers direct and indirect rollovers and the 60-day rule. If you hold employer stock in the plan, the net unrealized appreciation rules may be worth reviewing before rolling it over.

Required minimum distributions from pre-tax balances begin at the age set under SECURE 2.0, currently 73 for people reaching that age now and scheduled to rise to 75 in later years. If you are still working for the employer sponsoring the plan and do not own more than 5% of the company, many plans let you delay RMDs from that plan until you retire.

Defined contribution vs defined benefit

The difference between the two designs comes down to who carries which risks.

Feature	Defined contribution	Defined benefit (pension)
What is promised	A contribution formula, not an outcome	A retirement income formula
Investment risk	Employee	Employer
Longevity risk	Employee, unless they buy an annuity	Employer, through lifetime payments
Benefit depends on	Contributions, returns, fees	Salary, years of service, plan formula
Portability	Vested balance moves with you	Benefit usually stays with the plan until retirement
Federal insurance	Not insured by the PBGC	Most private-sector plans insured by the PBGC, up to limits
Visibility	Account balance on every statement	Projected benefit, harder to value
Typical payout	Withdrawals, rollover or annuity	Monthly annuity, sometimes a lump sum option

A defined benefit plan suits someone who stays with one employer for a long career and values certainty. A defined contribution plan suits a mobile workforce and gives the employee control, but it also hands them decisions about saving rates, investments and drawdown that a pension takes care of. Our article on the defined benefit plan explains pension formulas and payouts in detail.

The shift from pensions to defined contribution plans in the private sector over recent decades means many people now reach retirement with an account balance rather than a promised income. Turning that balance into a dependable income is the planning problem that follows.

Turning a defined contribution balance into income

Because a defined contribution plan does not promise income, the retiree has to decide how to draw it down. Common approaches include a sustainable withdrawal rate, a bucket strategy that holds near-term spending in cash, or buying an annuity with part of the balance to cover essential costs.

Some plans now offer in-plan lifetime income options, and the SECURE Act of 2019 introduced a fiduciary safe harbor for employers choosing an annuity provider and required plan statements to show an illustration of the account balance as monthly lifetime income. Those illustrations are estimates based on assumptions set by the Department of Labor, not quotes.

Illustrative example only. Suppose a retiree has a $400,000 balance. If they withdrew 4% in the first year, that would be $16,000 before tax. If they instead used $150,000 to buy an immediate annuity and the insurer's quote at the time were, say, 7% a year, that would provide $10,500 a year for life, with $250,000 left invested. These figures are hypothetical. Annuity quotes vary with age, interest rates and contract terms, and change frequently; verify current quotes before acting. The how long will my money last calculator can help test withdrawal assumptions.

Frequently asked questions

What is a defined contribution plan in simple terms?

It is an employer retirement plan with an individual account in your name. You, your employer or both put money in, you choose the investments, and what you get in retirement is whatever the account is worth. A 401(k) is the most common example.

Is a 401(k) a defined contribution plan?

Yes. The 401(k) is the most widely used defined contribution plan in the private sector. The 403(b), governmental 457(b), Thrift Savings Plan and profit-sharing plans are also defined contribution plans.

What is the main difference between defined contribution and defined benefit plans?

A defined benefit plan promises a specific retirement income and the employer carries the investment risk. A defined contribution plan promises only the contributions, so the employee carries the investment and longevity risk and the final benefit depends on the account balance.

Is a defined contribution plan protected if my employer goes bankrupt?

Plan assets are held in trust separately from the employer's business assets under ERISA, so creditors of the employer generally cannot reach them. The value of your account can still fall with the markets, and the PBGC does not insure defined contribution plans.

This article is general education, not personal financial or tax advice. Contribution limits, RMD ages and plan rules change, so check current IRS and Department of Labor guidance, read your plan's summary plan description and speak to a qualified professional before acting.