In 2024, you're allowed to contribute up to $23,000 to a 401(k). In 2025, that amount rises to $23,500. Workers over 50 are also eligible to make catch-up contributions. For both 2024 and 2025, the catch-up contribution amount is $7,500. However, starting in 2025, employees aged 60-63 have a higher catch-up contribution limit of $11,250.
These limits are much higher than what you find with IRAs, and they enable you to set aside a fairly large sum annually.
Most 401(k)s are tax-deferred, so your contributions reduce your taxable income each year. You must pay taxes on your distributions in retirement, but you may be in a lower tax bracket by then, in which case you would save money. Some employers also offer Roth 401(k)s. You pay taxes on contributions to these accounts now, but you'll get tax-free withdrawals in retirement.
Some employers also match a portion of their employees' 401(k) contributions, which can make the task of saving for retirement a little easier. Each company has its own rules about matching, so consult with your HR department to learn how yours works.