Maxing Out a 401(k) After Changing Jobs: How to Avoid Double Contributions

Published on 2026-10-21 · Free Educational Guide · 100% Client-Side Suite

Maxing Out a 401(k) After Changing Jobs

Switching jobs during the calendar year is one of the most common causes of accidental 401(k) overcontributions. If you are aiming to max out your retirement savings across multiple employers, you must actively track and coordinate your contributions yourself.

1. The Unified Individual Limit (IRC §402(g))

The most critical legal rule to understand is that the IRS 401(k) elective deferral limit applies to you as an individual taxpayer, not to your specific job or employer.

  • For 2026, the statutory limit is $24,500 (or $32,500 if you are age 50 or older).
  • If you worked for Company A from January to June and contributed $15,000, you have only $9,500 of remaining contribution room for the rest of 2026 at Company B.

2. Why Your New Employer Will Not Stop You

Automated payroll systems (like ADP, Paychex, or Workday) are programmed to automatically cut off employee 401(k) contributions once you hit the annual statutory limit.

However, your new employer's payroll system starts at $0. Company B has zero visibility into what Company A deducted from your paychecks. If you instruct Company B to withhold $2,000 per month across seven paychecks, Company B will happily deduct $14,000—pushing your total annual contributions to $29,000 and creating a $4,500 excess deferral.

3. How to Find Your Prior Year Contributions

To calculate your remaining contribution room accurately:

  1. Locate your final paystub from your previous employer.
  2. Look for the line item labeled "401(k) Deferral," "Pre-Tax Retirement," or "Roth 401(k)."
  3. On your annual Form W-2 (which you will receive in January), this cumulative amount is reported in Box 12 under Code D (for pre-tax deferrals) or Code AA (for designated Roth deferrals).
  4. Subtract this exact number from the 2026 statutory limit ($24,500 for under 50).

4. The Penalties of an Excess Deferral

If you accidentally exceed the annual limit across multiple employers, the IRS treats the excess severely through double taxation:

  • The excess contribution is included in your taxable gross income in the year contributed.
  • When you eventually withdraw the excess funds in retirement, the money is taxed a second time as ordinary income.

How to Fix an Excess Contribution Before April 15

If you discover you overcontributed across two jobs, you can fix the error penalty-free:

  1. Contact one of your plan administrators immediately (usually the second employer).
  2. Request an "Excess Deferral Distribution."
  3. The plan administrator will refund the excess amount plus any attributable earnings before the tax filing deadline (typically April 15 of the following calendar year).
  4. You will receive a Form 1099-R reporting the refund as taxable income for the year contributed.

Plan your exact per-paycheck target at your new employer with our 401(k) Contribution Per Paycheck Calculator to ensure you hit the cap without overcontributing!