In September 2026, the key 401(k) changes are higher contribution limits, a larger catch-up for ages 60–63, and mandatory Roth catch-ups for some higher-paid workers. New plan-document deadlines and paper-statement rules also deserve attention. A 401(k) is an employer-sponsored retirement account funded through payroll deductions, often with employer contributions. Social Security updates matter because they affect how much retirement income workers may need from their own savings.
Official resources:
- Read the official guidance from Dol — Use this primary source to verify the official guidance.
- Read the official guidance from Irs — Use this primary source to verify the official guidance.
Table of Contents
- How much can you contribute in 2026?
- Who must make Roth catch-up contributions?
- What should participants expect from plan documents?
- How do Social Security updates affect planning?
- What should you do before year-end?
How much can you contribute in 2026?
The employee elective-deferral limit—the amount contributed from your pay—is $24,500 in 2026. That is $1,000 more than the 2025 limit. Participants age 50 or older can contribute another $8,000 if their plan permits catch-ups. This produces a potential employee contribution of $32,500, subject to compensation and plan terms.
People turning 60, 61, 62, or 63 during 2026 may qualify for an $11,250 super catch-up instead. Their potential employee contribution reaches $35,750. The IRS also raised the annual-additions limit to $72,000, excluding catch-ups, and capped usable compensation at $360,000, according to IRS Notice 2025-67. The $72,000 limit includes applicable employee and employer additions rather than serving as a second employee-deferral allowance. Check payroll records and the plan's summary materials before assuming every contribution category is available.
Who must make Roth catch-up contributions?
Beginning in 2026, catch-up-eligible employees whose 2025 wages from the sponsoring employer exceeded $150,000 must use after-tax Roth treatment for 2026 catch-up contributions when their plan offers Roth catch-ups. Regular contributions up to the standard $24,500 limit are separate from this catch-up rule. Roth contributions do not reduce current taxable income.
This can change take-home pay for affected workers who previously made pre-tax catch-ups, even when their contribution amount stays the same. The IRS explains the wage test and Roth requirement in its current catch-up contribution guidance. Before increasing contributions, confirm:.
- Your 2025 wages from the employer sponsoring the plan.
- Your age at the end of 2026.
- Whether the plan permits catch-ups and Roth contributions.
- How payroll will classify contributions after reaching $24,500.
What should participants expect from plan documents?
Most nongovernmental plans that are not collectively bargained generally have until December 31, 2026, to adopt SECURE 2.0-related amendments. Governmental and certain collectively bargained plans have later deadlines. That amendment deadline does not postpone compliance. Employers and administrators must operate plans under applicable rules now, even if formal documents are updated later.
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Defined-contribution plans generally must also provide at least one paper benefit statement per calendar year for plan years beginning after 2025. The Labor Department temporarily will not enforce that requirement against administrators using a good-faith, reasonable interpretation while final electronic-disclosure rules remain pending, as described in Field Assistance Bulletin 2026-02. Participants should review each new statement for contribution totals, employer additions, beneficiary information, and contact instructions. Ask the administrator for clarification when payroll records and the statement do not match.
How do Social Security updates affect planning?
Social Security benefits increased 2.8% in 2026. The OASDI taxable-wage ceiling is $184,500, while workers below full retirement age can earn $24,480 before the retirement earnings test begins withholding benefits. As of September 2026, SSA has not announced the 2027 cost-of-living adjustment. The agency says the official announcement will come in October 2026, so earlier figures are projections rather than confirmed benefit increases.
The 2026 Trustees' intermediate projection places depletion of the Old-Age and Survivors Insurance reserves in the fourth quarter of 2032. Continuing income would then cover 78% of scheduled benefits, according to the 2026 Trustees Report summary. That projection is not a scheduled benefit cut. It does, however, show why a retirement plan should test whether personal savings can cover more of the income target instead of assuming every scheduled Social Security dollar will arrive.
What should you do before year-end?
Start with the contribution rate shown in payroll and estimate whether it will reach your intended annual amount. Workers aiming for the maximum may need to revise payroll elections, especially after a raise, bonus, job change, or missed contribution period.
Then review the plan rather than relying only on national limits. A legal maximum does not guarantee that a plan offers Roth contributions, catch-ups, the super catch-up, or every employer-contribution feature.
- Confirm your age-based catch-up category.
- Determine whether the Roth catch-up wage rule applies.
- Compare year-to-date deferrals with the appropriate annual limit.
- Read the newest benefit statement and plan notices.
- Treat the 2027 Social Security COLA as unknown until SSA's October announcement.
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