Nundina › Discover calendars › Retirement Contribution Deadlines calendar › 💼 401(k) Employee Contribution Deadline (Tax Year 2026)💼 401(k) Employee Contribution Deadline (Tax Year 2026)31 December 2026Last day to make employee elective-deferral contributions to a calendar-year 401(k) for tax year 2026 - unlike an IRA, there is no following-year grace period. Verified via IRS guidance, 2026-07.Retirement Contribution Deadlines calendarMore from this calendar

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