Irs 401k After Tax Limits 2024. The deadline to contribute to an individual retirement account (ira) for any given tax year is the due date of your federal income tax return of the following calendar year for most. For those with a 401 (k), 403 (b), or 457 plan through an employer, your new maximum contribution limit will go up to $23,000 in 2024.

Get tax information for retirement plans: Required minimum distribution, contribution limits, plan types and reporting requirements for plan administrators.