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RETIREMENT • Defined Contribution Plans
Traditional 401(k): Definition, Contribution Limits, Tax Benefits & Rules
Comprehensive guide to Traditional 401(k) plans — contribution limits, pre-tax salary deductions, employer matching formulas, early withdrawal penalties, and RMD schedules.
By Elena Rostova, CFP® • Reviewed by Julian Chen, CFP®, RICP® • November 4, 2026
Key Takeaways
- Traditional 401(k) contributions are deducted pre-tax from wages, directly lowering adjusted gross income (AGI) for the current calendar year.
- For 2026, the individual elective deferral limit is $23,500, with an additional $7,500 catch-up for workers aged 50 and older.
- Employer matching contributions represent guaranteed return on capital and accumulate tax-deferred alongside employee elective deferrals.
- Withdrawals taken before age 59½ generally trigger ordinary income taxes plus a 10% IRS penalty, unless a qualifying exception applies.
2026 Retirement Limits IRS Statutory
401(k) Employee Elective Deferral $23,500
Catch-Up (Age 50+) +$7,500
Traditional & Roth IRA Limit $7,000
Catch-Up (Age 50+) +$1,000
SECURE 2.0 Super Catch-Up (60-63) $11,250
Higher Limit Window Ages 60, 61, 62, 63
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401(k) Contribution Limits (2026): Rules, Catch-Ups, and Employer Caps
Master the 2026 401(k) contribution limits, employee elective deferrals, super catch-up rules under SECURE 2.0, employer match caps, and combined Section 415(c) thresholds.
By Elena Rostova, CFP®
Retirement Planning
Traditional 401(k): Definition, Contribution Limits, Tax Benefits & Rules
Comprehensive guide to Traditional 401(k) plans — contribution limits, pre-tax salary deductions, employer matching formulas, early withdrawal penalties, and RMD schedules.
By Elena Rostova, CFP®