Maximum Solo 401k Contribution 2025. The standard 2025 maximum 401k contribution limit for employees is $23,500 (+$500 versus 2024). Find out how much you can contribute to your solo 401k with our free contribution calculator.
For tax year 2025, employees can defer $23,500 into their 401 (k) and iras, a modest increase from the $23,000 contribution limit in 2024. Learn to optimize your savings this year.