The maximum amount that an employee or employer can contribute to a 401(k) plan is adjusted periodically to account for inflation. As of 2020, the basic limits on employee contributions are $19,500 per year for workers under age 50 and $26,000 for those 50 and up (including the $6,500 catch-up contribution). If the employer also contributes—or if the employee elects to make additional, non-deductible after-tax contributions to their traditional 401(k) account (if allowed by their plan)—the total employee/employer contribution for workers under 50 is capped at $57,000, or 100% of employee compensation, whichever is lower. For those 50 and over, the limit is $63,500.