What Is the 403(b) Universal Availability Requirement?

The 403(b) universal availability requirement means that if your plan lets any employee make salary-deferral contributions, you generally have to offer that same chance to every other eligible employee in the organization. It replaces the complex nondiscrimination testing that 401(k) plans use with a simpler, more direct standard: if one person can save, nearly everyone can save. Getting it wrong triggers corrective contributions, potential loss of the plan’s tax benefits, and real administrative cleanup.

Which Employers the Rule Applies To

Two kinds of employers can sponsor a 403(b): tax-exempt organizations under Section 501(c)(3), such as hospitals, charities, and private universities, and public educational institutions like state universities and local school districts.¹ Once the plan allows salary deferrals, universal availability applies automatically.

Churches and qualified church-controlled organizations are the major exception. The statute exempts contracts purchased by a church from the nondiscrimination requirements that include universal availability,¹ and the IRS confirms that elective-deferral universal availability does not apply to churches or qualified church-controlled organizations as defined in IRC Section 3121(w)(3).² A church-affiliated school or hospital that operates separately from the church itself should confirm its status before assuming the exemption applies.

What the Rule Actually Covers

Universal availability is only about elective deferrals, meaning the contributions employees choose to make from their own paychecks. It does not force the employer to match, to make a profit-sharing contribution, or to fund the plan in any way. Those employer-paid contributions are governed by separate nondiscrimination rules. The mandate here is narrower: if the plan permits any employee to reduce salary and route it into a 403(b), that same option has to be open to virtually every other eligible employee.³

The right to defer also includes the right to designate deferrals as Roth contributions, if the plan permits them.³ An employer cannot offer traditional pre-tax deferrals to everyone but limit the Roth option to a subset.

Which Employees You Can Exclude

The rule sounds absolute, but the regulations carve out several categories a plan may leave out without violating universal availability:

Employees eligible to make elective deferrals under another 403(b), a 401(k), or a 457(b) plan sponsored by the same employer.²
Employees expected to contribute $200 or less per year.¹
Non-resident aliens with no U.S.-source income from the employer.³
Students performing services at the school, college, or university where they are enrolled and regularly attending classes, as described in IRC Section 3121(b)(10).⁴
Employees who normally work fewer than 20 hours per week.³

One category that is not on that list: collectively bargained employees. Unlike some other retirement-plan rules, the 403(b) universal availability requirement does not let an employer exclude workers just because they are covered by a union contract.³ Administrators used to 401(k) rules regularly get caught by this.

The Part-Time Exclusion Is Trickier Than It Looks

“Normally works fewer than 20 hours per week” is not a matter of glancing at a schedule. In an employee’s first year, the employer looks at whether the worker is reasonably expected to log fewer than 1,000 hours. For each later plan year, the employer checks whether the employee actually worked fewer than 1,000 hours.²

Then the once-in-always-in rule bites. If a part-time employee crosses the 1,000-hour threshold in any 12-month measurement period, that employee becomes eligible and can never be excluded under the part-time exception again, even if hours later drop.² A teacher’s aide who picks up extra shifts one year and hits 1,000 hours has permanently crossed the line. You need hour-tracking that catches those transitions, because missing one is a universal availability failure.

SECURE 2.0 Long-Term Part-Time Employees

For plan years beginning after December 31, 2024, SECURE 2.0 added a second eligibility pathway for long-term part-time employees in 403(b) plans that are subject to ERISA. Under this rule, the plan cannot require a waiting period longer than two consecutive 12-month periods in each of which the employee worked at least 500 hours, provided the employee is also at least 21.⁵

What that means in practice: an ERISA-covered 403(b) plan that had been excluding a part-time worker who logged 500 hours in both 2025 and 2026 must let that employee begin making elective deferrals. The 1,000-hour bar is no longer the only trigger. Governmental and church plans, which are not subject to ERISA, are not affected.⁵

2026 Deferral Limits Every Eligible Employee Must Be Allowed to Reach

The effective-opportunity standard requires that eligible employees be allowed to defer up to the applicable IRS limits, so the current numbers matter. For 2026:

Basic elective deferral: $24,500.⁶
Age 50+ catch-up: $8,000, for participants who are at least 50 by year-end (except those aged 60 through 63).⁶
Age 60–63 enhanced catch-up: $11,250, a higher catch-up added by SECURE 2.0 for participants who turn 60, 61, 62, or 63 during the year.⁶
15-year service catch-up: up to an additional $3,000 per year, with a $15,000 lifetime cap, for employees with at least 15 years of service at certain 403(b) employers including public schools, hospitals, and churches.⁷

A plan that caps deferrals below these limits for some employees while allowing others the full amount would fail the effective-opportunity test. Each employee must be allowed to defer up to the lesser of the statutory limits or the contract’s maximum.³

Effective Opportunity and the Annual Notice

Listing an employee as eligible on paper is not enough. The regulations require that every eligible employee receive an “effective opportunity” to participate, and the IRS judges that on facts and circumstances. Three factors carry the most weight: whether the employee actually received notice of the right to participate, how much time they had to make an election, and whether any conditions on elections discouraged participation.³

At a minimum, the plan must give each employee at least one chance per plan year to start, stop, or change a deferral election. That applies equally to part-time and full-time workers. The notice needs to explain the right to enter into a salary reduction agreement, describe how to start or change deferrals, and leave enough time to actually make a decision before the election period closes.²

An effective opportunity also cannot exist if the employer ties other benefits or rights to whether the employee participates in the 403(b), which would undermine the voluntary nature of the election.³

Delivering the Notice Electronically

Treasury Regulation Section 1.401(a)-21 permits electronic delivery of enrollment notices, but with safeguards. Under the alternative-method safe harbor, the electronic system has to give the employee effective access to the notice, tell them they can request a paper copy at no charge, present the information in a way no less understandable than a paper document, and alert the employee to the significance of the notice at delivery. It also has to protect against unauthorized access and produce accurate records later.⁸ A mass email with a vague subject line and a buried link is unlikely to clear the bar.

Fixing a Universal Availability Failure

Mistakes happen. A group of employees was never offered the chance to defer, or the annual notice went out to full-time staff and missed the part-timers. The IRS provides a structured correction process, and speed matters.

The baseline fix requires two things: offer each improperly excluded employee the chance to participate going forward, and make a corrective contribution for the missed deferral opportunity. The standard corrective contribution is 50% of the employee’s missed deferral, adjusted for lost earnings through the correction date.⁹

Since no one knows what the excluded employee would actually have chosen, the IRS uses a safe-harbor assumption: the missed deferral equals the greater of 3% of compensation or the maximum deferral rate at which the plan gives a 100% match. The 50% corrective contribution on that amount typically works out to 1.5% of compensation per year of exclusion. If the plan offered a match, the employer also has to restore the match that would have applied.⁹

Reduced Amounts for Quick Fixes

Catch it fast and the number drops:

Failure lasting less than three months: the corrective contribution drops to zero if correct deferrals begin within the three-month window and the employer gives affected employees a special notice within 45 days of restoring the deferral opportunity.⁹
Failure lasting longer than three months but corrected within two plan years: the corrective contribution drops from 50% to 25% of the missed deferral if the excluded employee is still employed, correct deferrals begin by the last day of the second plan year after the failure started, and the special notice goes out within 45 days.⁹

The gap between month two and month four can be the difference between owing nothing and owing 25% of missed deferrals for every affected employee across every year of the failure. For a large school district or hospital system, that math adds up fast.

Correction Programs

The IRS’s Employee Plans Compliance Resolution System offers three paths. The Self-Correction Program requires no application or IRS filing; minor errors can be corrected any time, and more significant ones generally must be fixed within two years. The Voluntary Correction Program requires a submission on Form 14568 and is appropriate when the error is significant or the employer wants IRS approval of the correction method. The Audit Closing Agreement Program applies when the IRS discovers the error during an audit, and involves a negotiated sanction on top of the correction.⁹

What Happens If You Ignore a Failure

An employer that leaves a universal availability failure alone risks the plan’s tax-favored status. Under the statute, a 403(b) plan must meet the nondiscrimination requirements of Section 403(b)(12) for contributions to be excluded from employees’ gross income.¹ A universal availability failure is a nondiscrimination failure, and the tax shelter unravels.

Disqualification cascades. Employees may have to include employer contributions in gross income for the years the plan was out of compliance. The plan’s trust loses its tax-exempt status. Distributions cannot be rolled over into an IRA or another eligible retirement plan. Contributions become subject to Social Security, Medicare, and federal unemployment taxes that would otherwise not apply.¹⁰ The employer’s deduction for contributions is also limited or eliminated.

In practice, the IRS strongly prefers that employers use the correction programs, and most universal availability failures are resolved through self-correction or a voluntary submission long before disqualification is a realistic threat. That is exactly why prompt identification matters. An error that sits uncorrected for years becomes exponentially more expensive and harder to fix cleanly.

1
Office of the Law Revision Counsel. 26 USC 403 – Taxation of Employee Annuities
2
Internal Revenue Service. 403(b) Plan – The Universal Availability Requirement
3
eCFR. 26 CFR 1.403(b)-5 – Nondiscrimination Rules
4
Office of the Law Revision Counsel. 26 USC 3121 – Definitions
5
Internal Revenue Service. Notice 2024-73 – Additional Guidance with Respect to Long-Term, Part-Time Employees
6
Internal Revenue Service. Notice 2025-67 – 2026 Amounts Relating to Retirement Plans and IRAs
7
Internal Revenue Service. Retirement Topics – 403(b) Contribution Limits
8
Internal Revenue Service. Treasury Decision 9294 – Use of Electronic Media for Providing Employee Benefit Notices
9
Internal Revenue Service. 403(b) Plan Fix-It Guide – Universal Availability Failure
10
Internal Revenue Service. Tax Consequences of Plan Disqualification