Definition
A 403(b) plan is a defined contribution plan established under Internal Revenue Code Section 403(b) that is available to employees of public schools, certain tax-exempt organizations, and certain ministers, and that permits pre-tax or Roth salary deferrals into annuity contracts or custodial mutual fund accounts.
Why it matters
The 403(b) plan is the dominant retirement plan form in the nonprofit, education, and religious employer sectors, and it covers a substantial share of teachers, university faculty, hospital employees, and other tax-exempt-organization workforces. Its structural features overlap substantially with the 401(k) plan but differ in the eligible employer types, the permissible investment vehicles, and specific catch-up rules, and those differences shape what analytical and distribution options are available.
How it works
A 403(b) plan operates as a defined contribution plan under Internal Revenue Code Section 403(b), with elective deferrals limited to two investment vehicle types by statute: annuity contracts (originally the exclusive vehicle, historically referred to as "tax-sheltered annuities") and custodial mutual fund accounts introduced by later amendments. For 2026, elective deferrals are capped at $24,500 with an $8,000 age-50 catch-up and an $11,250 SECURE 2.0 catch-up for participants age 60 through 63; the total limit on combined participant and employer contributions is $72,000 (source: IRS Notice 2025-67). A 403(b) plan may also permit a service-based catch-up of up to $3,000 per year for participants with 15 or more years of service with the same qualifying employer, subject to a $15,000 lifetime cap. Distribution restrictions parallel those of the 401(k) plan: separation from service, death, disability, plan termination, age 59½, or financial hardship. 403(b) plans sponsored by private-sector tax-exempt employers are subject to ERISA; church plans and governmental plans are exempt from ERISA and operate under separate statutory regimes.
In practice
If you participate in a 403(b) plan, the operative decisions parallel those in a 401(k): how much to defer, whether to elect pre-tax or Roth treatment, how to allocate across the plan's investment options, and how to handle the balance at retirement or job change. Two features of 403(b) plans warrant specific attention. First, the investment menu is often structured differently than a typical 401(k) — historically dominated by fixed and variable annuity contracts, with mutual fund options added later — and the mix of vehicle types can affect fees, guarantees, and distribution options. Second, if you have 15 or more years of service with the same qualifying employer, the service-based catch-up may permit additional deferrals beyond the standard age-based catch-up. A professional advising on 403(b) decisions should be able to name the specific vehicles available, the fees and features of each, and the applicability of the service-based catch-up.
In the Longevity Standard Framework
The 403(b) plan is the primary defined contribution structure for the education and nonprofit workforce, and the cost-of-income framework applies to 403(b) balances at decumulation identically to how it applies to 401(k) balances. The annuity contract vehicles that dominate legacy 403(b) portfolios have historical significance: the earliest 403(b) plans were structured as tax-sheltered annuities and were, for many participants, the first widely available lifetime-income-capable retirement savings arrangement. Contemporary 403(b) plans commonly include both annuities and mutual funds.
Related terms
- Defined contribution plan
- 401(k) plan
- 457(b) plan
- Tax-sheltered annuity
- Elective deferral
- Group annuity contract
- Employee Retirement Income Security Act
- In-plan lifetime income option