If you work for a public school, a 501(c)(3) nonprofit, or a hospital, your retirement plan is almost certainly a 403(b), not a 401(k) — the two share most of the same contribution math, but 403(b)s carry one genuinely unusual rule that doesn’t exist anywhere else in the retirement system.
The 2026 Baseline Numbers
The maximum employee deferral into a 403(b) for 2026 is $24,500, identical to the 401(k) limit, and the combined employee-plus-employer cap is $72,000. Standard age-based catch-up contributions add $8,000 for participants 50–59 and 64+, and the SECURE 2.0 “super catch-up” for ages 60–63 raises that to $11,250 — the same figures used across most employer plans, covered in our 2026 contribution limits guide.
The 15-Year Rule: 403(b)’s Unique Extra Catch-Up
Employees with 15 or more years of service at a qualifying employer (a public school, hospital, church, or certain other nonprofits — this rule doesn’t exist for 401(k)s) may be eligible for an additional catch-up of up to $3,000 per year, subject to a $15,000 lifetime maximum. Not every 403(b) plan offers it, and eligibility depends on your average contribution history, not just tenure.
Stacking Order When You Qualify for Both
A long-tenured employee 50 or older can potentially use both the 15-year rule and the age-based catch-up in the same year — but the IRS requires a specific order: contributions above the standard $24,500 limit count against the 15-year catch-up first, and only the amount exceeding that gets applied to the age-based catch-up. Getting the order backward doesn’t cost you money, but it can exhaust your $15,000 lifetime 15-year cap faster than necessary.
Annuity Contracts vs. Custodial Accounts
403(b) plans come in two structural flavors: 403(b)(1) annuity contracts, historically sold through insurance-company reps directly to teachers (and historically criticized for high fees and surrender charges), and 403(b)(7) custodial accounts holding mutual funds, generally with lower costs. Many public-school 403(b) menus still include both — checking which structure your contributions actually sit in matters as much as the contribution limit itself.
The Employer Match Gap
Unlike most 401(k)s, a meaningful share of nonprofit and school-district 403(b) plans offer no employer match at all, simply because nonprofit budgets don’t always build one in — don’t assume “my employer has a retirement plan” means free matching money is on the table the way it usually is in the private sector.
The Bottom Line
If you’ve been with the same nonprofit, school, or hospital for 15+ years, ask your plan administrator directly whether the 15-year catch-up is available — it’s a genuinely underused provision specific to this one plan type, and most participants have never heard of it.
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