Solo 401 K Contribution Limits 2024. The contribution limit for 401(k)s, 403(b)s, most 457 plans and the federal government's thrift savings plan is $23,000 for 2024, up from $22,500 in 2023. $69,000 for 2024 (up from $66,000 in 2023);

The total solo 401 (k) contribution limit is up to $69,000 in 2024. For 2024, an employee can contribute up to $23,000.