403b vs 401k in 2026: Key Differences, Contribution Limits & Which Is Better
Compare 403(b) and 401(k) retirement plans. Contribution limits, tax treatment, employer matching, investment options, the 15-year catch-up rule, and which plan is right for your situation in 2026.
403(b) vs 401(k) — Key Facts
| 403(b) vs 401(k) — Key Facts | ||
|---|---|---|
| Feature | 403(b) Plan | 401(k) Plan |
| IRC Section | Section 403(b) | Section 401(k) |
| Also known as | Tax-Sheltered Annuity (TSA) plan | N/A |
| Eligible employers | Public schools, 501(c)(3) nonprofits, churches, ministers | Private-sector employers, some government entities |
| 2026 employee contribution limit | $24,500 (under age 50) | $24,500 (under age 50) |
| 2026 catch-up (age 50+) | $8,000 | $8,000 |
| 2026 enhanced catch-up (age 60–63) | $11,250 (SECURE 2.0) | $11,250 (SECURE 2.0) |
| 15-year service catch-up | Up to $3,000/year additional (lifetime max $15,000) | Not available |
| 2026 total annual additions limit | $72,000 (employee + employer) | $72,000 (employee + employer) |
| Employer match | Permitted but less common | Permitted and widely offered |
| Investment options | Annuity contracts, mutual fund custodial accounts, retirement income accounts (church plans) | Broad plan menu: mutual funds, target-date funds, index funds, company stock |
| Roth option | Available if plan permits | Available if plan permits |
| ERISA coverage | Not always — governmental and church plans typically exempt | Yes (except governmental plans) |
| Loans | Permitted if plan allows | Permitted if plan allows |
| Hardship withdrawals | Permitted if plan allows | Permitted if plan allows |
| RMDs (traditional) | Required beginning at age 73 (SECURE 2.0) | Required beginning at age 73 (SECURE 2.0) |
| RMDs (Roth) | Not required during owner's lifetime (SECURE 2.0) | Not required during owner's lifetime (SECURE 2.0) |
| Sources | IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — 401(k) and Profit-Sharing Plan Contribution Limits | IRS — COLA Increases for Dollar Limitations | |
What Is a 403(b) Plan?
A 403(b) plan is a tax-advantaged retirement savings plan available to employees of public schools, tax-exempt organizations under IRC Section 501(c)(3), and certain ministers. Also known as a tax-sheltered annuity (TSA) plan, the 403(b) allows employees to contribute a portion of their salary on a pre-tax or Roth (after-tax) basis into individual retirement accounts, where the funds grow tax-deferred until withdrawal.
Under IRC Section 403(b), eligible employers that may sponsor a 403(b) plan include public school systems (including elementary and secondary schools and colleges or universities), tax-exempt organizations established under IRC Section 501(c)(3) (such as hospitals, charities, religious organizations, and cultural institutions), cooperative hospital service organizations, civilian faculty and staff of the Uniformed Services University of the Health Sciences (USUHS), and employees of public school systems organized by Indian tribal governments. Self-employed ministers are also eligible to participate.
Individual accounts in a 403(b) plan can be funded through three types of investment vehicles: annuity contracts provided through an insurance company, custodial accounts invested in mutual funds, or retirement income accounts set up for church employees that may be invested in either annuities or mutual funds. A 403(b) plan cannot be funded with life insurance contracts issued after September 24, 2007.
A 403(b) plan that allows any employee to make elective deferrals must extend the same opportunity to all employees under a “universal availability” rule, with limited exceptions for employees working fewer than 20 hours per week, students performing certain services, and other specified categories.
Sources: IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — Publication 571, Tax-Sheltered Annuity Plans (403(b) Plans) | IRS — 403(b) Plan Fix-It Guide: 403(b) Plan Overview
What Is a 401(k) Plan?
A 401(k) plan is an employer-sponsored defined contribution retirement plan governed by IRC Section 401(k). The plan allows employees to contribute a portion of their pre-tax or after-tax (Roth) wages to an individual investment account, where funds grow tax-deferred until withdrawal. The 401(k) is the most widely used employer-sponsored retirement plan in the private sector.
Any employer can offer a 401(k) plan, including for-profit corporations, partnerships, sole proprietorships, and some governmental entities. The plan is regulated under the Employee Retirement Income Security Act of 1974 (ERISA), which establishes fiduciary standards, reporting requirements, and participant protections. ERISA does not apply to governmental plans.
Investment options in a 401(k) are selected by the plan sponsor and typically include mutual funds, index funds, target-date funds, company stock (in some plans), and stable value funds. The investment menu is generally broader than what is available in a 403(b) annuity contract but narrower than a self-directed IRA.
Employer matching contributions are common in 401(k) plans. When an employer offers a match, the employer contributes additional funds to the employee’s account based on the employee’s own contributions, up to a specified percentage of the employee’s compensation. Matching contributions are subject to a vesting schedule that determines when the employee gains full ownership of the employer’s contributions.
Sources: IRS — 401(k) and Profit-Sharing Plan Contribution Limits | IRS — 401(k) Limit Increases to $24,500 for 2026
403(b) vs 401(k): Key Differences
While the 403(b) and 401(k) share many structural similarities — both are defined contribution plans offering pre-tax and Roth contributions with the same annual elective deferral limit — several important differences affect which employees have access to each plan, how contributions are structured, and what investment options are available.
Eligible Employers
The most fundamental difference between a 403(b) and a 401(k) is which employers can offer each plan. A 403(b) is restricted to public schools, 501(c)(3) tax-exempt organizations, churches, and certain ministers. A 401(k) is available to any employer in the private sector and some governmental entities. An employee cannot choose between a 403(b) and a 401(k) — the plan type is determined by the employer’s organizational classification.
Investment Options
A 403(b) plan limits investment vehicles to annuity contracts (from insurance companies), custodial accounts invested in mutual funds, and retirement income accounts for church employees. Historically, many 403(b) plans offered only annuity products, which may carry higher fees and surrender charges compared to mutual fund investments available in 401(k) plans. However, 403(b) custodial accounts that invest in mutual funds offer a broader range of options than annuity-only plans.
A 401(k) plan provides a menu of investment options selected by the plan sponsor. These typically include mutual funds, index funds, target-date funds, and in some cases company stock and stable value funds. While the 401(k) menu is limited to what the employer selects, the range of available investment types is generally broader than what a 403(b) annuity contract offers.
The 15-Year Service Catch-Up (403(b) Only)
The 403(b) plan offers a unique additional catch-up contribution that is not available in 401(k) plans. Under IRC Section 402(g)(7), an employee who has completed at least 15 years of service with the same eligible 403(b) employer (a public school, hospital, home health service agency, health and welfare service agency, church, or convention or association of churches) may make additional elective deferrals above the standard limit. The additional amount is the least of $3,000, $15,000 minus the total additional deferrals made under this rule in prior years, or $5,000 multiplied by years of service minus total elective deferrals made by the employer on the employee’s behalf in prior years.
This means a 403(b) participant with 15+ years of service could potentially contribute up to $27,500 in 2026 (the standard $24,500 limit plus $3,000 under the 15-year rule), even before age-based catch-up contributions are applied. If the participant is also age 50 or older, the law requires deferrals exceeding the standard limit to be applied first to the 15-year catch-up and then to the age 50 catch-up.
ERISA Coverage
Most 401(k) plans are governed by ERISA, which requires fiduciary responsibility, plan document requirements, vesting schedules, annual reporting (Form 5500), and participant disclosures. Governmental 401(k) plans are exempt from ERISA.
ERISA coverage for 403(b) plans depends on the employer type and level of employer involvement. Governmental 403(b) plans (such as those offered by public schools) and church 403(b) plans are typically exempt from ERISA. Non-governmental 403(b) plans maintained by 501(c)(3) organizations may or may not be subject to ERISA. Plans that are funded solely by employee salary deferrals with no employer contributions and minimal employer involvement may qualify for a “safe harbor” exemption from ERISA under DOL regulation 29 CFR 2510.3-2(f). Plans with employer contributions or significant employer involvement are generally subject to ERISA.
Employer Matching
Both 403(b) and 401(k) plans may offer employer matching contributions, but matching is significantly more common in 401(k) plans. Many private-sector employers use matching contributions as a competitive benefit for recruitment and retention. In the nonprofit and public school sectors, budget constraints and the historical structure of 403(b) plans as employee-funded arrangements mean that employer matching is less frequently offered, though it is permitted and is becoming more common.
Nondiscrimination Testing
401(k) plans are subject to nondiscrimination testing under IRC Sections 401(k) and 401(m), which ensure that highly compensated employees (HCEs) do not disproportionately benefit from the plan compared to non-highly compensated employees. Plans that fail these tests must take corrective action, such as returning excess contributions to HCEs.
403(b) plans are subject to a different nondiscrimination framework. Under IRC Section 403(b)(12), employer contributions (other than in governmental or church plans) must satisfy nondiscrimination requirements. However, 403(b) plans that accept only employee salary deferrals are subject to the “universal availability” requirement rather than the ADP/ACP testing used for 401(k) plans.
Sources: IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — 403(b) Contribution Limits | IRS — Publication 571 | IRS — 403(b) Plans: Catch-Up Contributions
Contribution Limits 2026: 403(b) and 401(k)
Both the 403(b) and 401(k) share the same IRS-set contribution limits for 2026. These limits are adjusted annually for cost-of-living increases under IRS Notice 2025-67.
| Limit Type | 2026 Amount | Applies To |
|---|---|---|
| Employee elective deferral limit (under age 50) | $24,500 | 403(b) and 401(k) |
| Catch-up contribution (age 50+) | $8,000 | 403(b) and 401(k) |
| Enhanced catch-up (age 60–63, SECURE 2.0) | $11,250 | 403(b) and 401(k) |
| 15-year service catch-up | Up to $3,000/year (lifetime max $15,000) | 403(b) only |
| Total annual additions (employee + employer, under age 50) | $72,000 | 403(b) and 401(k) |
| Total annual additions (age 50+, with catch-up) | $80,000 | 403(b) and 401(k) |
| Total annual additions (age 60–63, with enhanced catch-up) | $83,250 | 403(b) and 401(k) |
| Annual compensation limit for calculating contributions | $360,000 | 403(b) and 401(k) |
Combined deferral limit across plans: Employees who participate in both a 403(b) and a 401(k) (for example, through separate employers) must combine their elective deferrals across all plans. The total combined deferrals cannot exceed $24,500 for 2026 (plus any applicable catch-up amounts). The 457(b) plan has a separate limit that does not need to be combined with 403(b) or 401(k) deferrals.
Maximum deferral scenarios for 2026:
A 403(b) participant under age 50 with fewer than 15 years of service may contribute up to $24,500. A 403(b) participant under age 50 with 15+ years of service may contribute up to $27,500 ($24,500 + $3,000 under the 15-year rule). A 403(b) participant aged 50–59 or 64+ with 15+ years of service may contribute up to $35,500 ($24,500 + $3,000 + $8,000). A 403(b) participant aged 60–63 with 15+ years of service may contribute up to $38,750 ($24,500 + $3,000 + $11,250).
Sources: IRS — 403(b) Contribution Limits | IRS — 401(k) Contribution Limits | IRS Notice 2025-67 (PDF) | IRS — 401(k) Limit Increases to $24,500 for 2026
Employer Matching: 403(b) vs 401(k)
Both 403(b) and 401(k) plans permit employer matching contributions, but the prevalence and structure of matching differ between the two plan types.
In 401(k) plans, employer matching is widespread. Common matching formulas include 100% of employee contributions up to 3% of compensation, 50% of contributions up to 6% of compensation, or fixed dollar amounts. All employer matching contributions in a 401(k) are subject to a vesting schedule that determines when the employee gains full ownership of the matching funds.
In 403(b) plans, employer matching contributions are less common due to the organizational characteristics of eligible employers. Many public school systems and smaller nonprofits do not offer matching contributions. When matching is offered, the employer’s contributions follow the same general rules as 401(k) matching: contributions are tax-deductible for the employer, not included in the employee’s current taxable income, and subject to vesting schedules.
The total of employee and employer contributions to either plan cannot exceed $72,000 for 2026 (or the employee’s compensation, if less). This limit applies to 403(b) and 401(k) plans alike.
Employers who contribute to a 403(b) plan for an employee may continue to make nonelective contributions for up to five years following the employee’s separation from service, based on the employee’s includible compensation during the last year of service.
Sources: IRS — 403(b) FAQs | IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — Publication 571
Investment Options
The investment options available in a 403(b) versus a 401(k) represent one of the most significant practical differences between the two plans.
403(b) Investment Options
Under IRS rules, 403(b) plan accounts can only be held in three types of investment vehicles: annuity contracts issued by insurance companies, custodial accounts invested in mutual funds (or group trusts), and retirement income accounts available to church employees. The 403(b) plan cannot be funded with individual stocks, bonds, ETFs, real estate, or self-directed brokerage windows (unless accessed through a custodial account that permits such investments).
Historically, many 403(b) plans were heavily weighted toward annuity contracts. Annuity products may carry higher fees than mutual fund investments, including mortality and expense (M&E) charges, surrender charges for early withdrawals from the annuity, and administrative fees. However, the shift toward 403(b)(7) custodial accounts has given participants in many plans access to low-cost index mutual funds comparable to those available in 401(k) plans.
401(k) Investment Options
A 401(k) plan offers a broader range of potential investment types, though the actual options are limited to whatever the plan sponsor selects. Typical 401(k) investment menus include index funds, actively managed mutual funds, target-date funds, stable value funds, money market funds, and in some plans, a self-directed brokerage option and company stock.
The Department of Labor’s fiduciary rules under ERISA require 401(k) plan sponsors to select and monitor investments prudently, which has driven a trend toward lower-cost investment options in 401(k) plans.
Sources: IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — 403(b) Written Program Requirements | IRS — Publication 571
403(b) vs 401(k) for Teachers and Nonprofit Employees
Teachers, school administrators, hospital workers, and employees of charitable organizations are among the most common 403(b) participants. Understanding how the 403(b) works in these specific employment contexts is important for maximizing retirement savings.
Public School Employees
Public school employees — including teachers, administrators, and support staff involved in the day-to-day operations of a school — are eligible for a 403(b) plan. In many states, school employees participate in both a 403(b) plan (for voluntary salary deferrals) and a defined benefit pension plan (for guaranteed retirement income). The 403(b) serves as a supplemental savings vehicle in addition to the pension.
Public school 403(b) plans are governmental plans exempt from ERISA. This means they are not subject to ERISA’s fiduciary standards, vesting requirements, or Form 5500 filing obligations, though they must still comply with IRS rules under IRC Section 403(b) and applicable state regulations.
The 15-year service catch-up is particularly relevant for teachers and school administrators who spend their entire career with one school district. An employee with 15 or more years of service at the same public school system may be eligible to contribute an additional $3,000 per year above the standard deferral limit, up to a lifetime maximum of $15,000. This provision is exclusive to the 403(b) and is not available under any 401(k) plan.
501(c)(3) Nonprofit Employees
Employees of hospitals, universities, museums, charities, social service agencies, and other 501(c)(3) organizations are eligible for 403(b) plans. These plans may be subject to ERISA if the employer is involved in plan administration and makes employer contributions, or exempt from ERISA if the plan is funded entirely by employee salary deferrals with minimal employer involvement.
Some large nonprofit employers offer both a 403(b) plan and a 457(b) plan. A 457(b) governmental plan has its own separate contribution limit ($24,500 for 2026), which does not need to be combined with 403(b) or 401(k) deferrals. An employee who participates in both a 403(b) and a governmental 457(b) could potentially defer up to $49,000 in 2026 ($24,500 in each plan) before any catch-up contributions.
Church Employees
Church employees and ministers have access to retirement income accounts under IRC Section 403(b)(9), which can be invested in either annuities or mutual funds. Church plans are generally exempt from ERISA. Self-employed ministers are treated as employed by a tax-exempt organization and may participate in a 403(b) plan. Church employees may be subject to different rules regarding includible compensation calculations.
Sources: IRS — IRC 403(b) Tax-Sheltered Annuity Plans | IRS — 403(b) Plan Fix-It Guide: Eligible Employers | IRS — Publication 571 | IRS — 403(b) Contribution Limits
Which Is Better: 403(b) or 401(k)?
The choice between a 403(b) and a 401(k) is determined by the employer, not by the employee. An employee of a public school or 501(c)(3) organization will have access to a 403(b) plan. An employee of a for-profit company will have access to a 401(k) plan. The following comparison identifies the structural advantages of each plan type for employees evaluating their retirement savings options.
| Advantage | Plan Type | Explanation |
|---|---|---|
| Higher potential contribution | 403(b) | The 15-year service catch-up allows up to $3,000/year additional deferrals ($15,000 lifetime) — not available in 401(k) plans |
| Broader investment options | 401(k) | 401(k) plans generally offer a wider menu of funds and may include a self-directed brokerage option |
| More common employer matching | 401(k) | Matching is more prevalent in the private sector than in public schools and nonprofits |
| ERISA protections | 401(k) | ERISA provides fiduciary standards, vesting rules, and participant protections; many 403(b) plans are ERISA-exempt |
| Dual-plan savings potential | 403(b) | Employees of employers offering both a 403(b) and a 457(b) can defer to both plans with separate limits, potentially doubling their annual contributions |
| Lower fees (trend) | 401(k) | ERISA's fiduciary requirements have pushed 401(k) plans toward lower-cost investment options; some 403(b) annuity products carry higher fees |
| Post-separation employer contributions | 403(b) | Employers may continue nonelective contributions for up to 5 years after an employee's separation from service |
| Sources: IRS — 403(b) FAQs | IRS — 403(b) Contribution Limits | IRS — Publication 571 | ||
Frequently Asked Questions
What is the difference between a 403(b) and a 401(k)?
A 403(b) is a tax-sheltered annuity plan available to employees of public schools, 501(c)(3) tax-exempt organizations, and certain ministers under IRC Section 403(b). A 401(k) is an employer-sponsored retirement plan available to private-sector employers under IRC Section 401(k). Both share the same annual contribution limit ($24,500 for 2026) and offer pre-tax and Roth contribution options. Key differences include eligible employers, investment vehicle options, the 15-year service catch-up (403(b) only), and the prevalence of employer matching.
Is a 403(b) the same as a 401(k)?
No. While both are tax-advantaged defined contribution retirement plans with similar contribution limits, they differ in eligible employers, available investment vehicles, ERISA coverage, nondiscrimination testing requirements, and the availability of the 15-year service catch-up provision. A 403(b) is restricted to public schools, nonprofits, and churches. A 401(k) is available to private-sector employers.
What is the 403(b) contribution limit for 2026?
The 2026 elective deferral limit for a 403(b) plan is $24,500 for employees under age 50. Employees aged 50 and over may contribute an additional $8,000 in catch-up contributions ($32,500 total). Employees aged 60–63 may contribute an enhanced catch-up of $11,250 ($35,750 total). Employees with 15+ years of service at the same eligible 403(b) employer may also be eligible for an additional $3,000 per year under the 15-year service catch-up rule.
Can I have both a 403(b) and a 401(k)?
Yes. An employee who works for two different employers — one offering a 403(b) and another offering a 401(k) — may participate in both plans. However, the combined elective deferrals across all plans (403(b), 401(k), and SARSEP) cannot exceed $24,500 for 2026, plus any applicable catch-up contributions.
What is the 15-year catch-up rule for 403(b) plans?
Employees who have completed 15 or more years of service with the same eligible 403(b) employer may increase their elective deferral limit by the least of $3,000, $15,000 minus total additional deferrals made under this rule in prior years, or $5,000 times years of service minus total employer deferrals in prior years. This provision is exclusive to 403(b) plans and is not available in 401(k) plans.
Can I roll over a 403(b) to a 401(k) or IRA?
Yes. Eligible distributions from a 403(b) may be rolled over to a 401(k), traditional IRA, Roth IRA (subject to income tax on converted amounts), or another 403(b). Similarly, eligible distributions from a 401(k) or traditional IRA may be rolled into a 403(b), if the 403(b) plan permits incoming rollovers. Roth 403(b) amounts may only be rolled to another Roth account.
Are 403(b) plans covered by ERISA?
Not always. Governmental 403(b) plans (such as those offered by public schools) and church 403(b) plans are generally exempt from ERISA. Non-governmental 403(b) plans maintained by 501(c)(3) organizations may be exempt from ERISA if they are funded solely by employee salary deferrals with minimal employer involvement. Plans with employer contributions or significant employer involvement in administration are typically subject to ERISA.
What is a 401(a) plan and how does it differ from a 403(b)?
A 401(a) plan is an employer-sponsored defined contribution retirement plan established by government agencies and certain nonprofits. Unlike a 403(b), which may accept both employee and employer contributions, a 401(a) is typically funded primarily or exclusively by the employer. Contribution amounts and participation are set by the employer rather than being employee-directed. Both plan types are subject to the same $72,000 total annual additions limit for 2026.
Official Government Sources
All information on this page is compiled exclusively from official U.S. government (.gov) sources:
- IRS — IRC 403(b) Tax-Sheltered Annuity Plans
- IRS — 403(b) Contribution Limits
- IRS — 403(b) Plans: Catch-Up Contributions
- IRS — 403(b) FAQs
- IRS — 403(b) Plan Fix-It Guide: Overview
- IRS — 403(b) Plan Fix-It Guide: Eligible Employers
- IRS — 403(b) Written Program Requirements
- IRS — Publication 571, Tax-Sheltered Annuity Plans (403(b) Plans)
- IRS — 401(k) and Profit-Sharing Plan Contribution Limits
- IRS — 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
- IRS — COLA Increases for Dollar Limitations on Benefits and Contributions
- IRS Notice 2025-67 — 2026 COLA Adjustments (PDF)
- IRS — Publication 4482, 403(b) Tax-Sheltered Annuities for Participants (PDF)
Update History
March 2026: Initial publication. All URLs verified functional.