Two of the most common retirement savings tools are IRAs (Individual Retirement Accounts) and 401(k)s. While they both offer tax advantages, their legal structures and rules differ in key ways.
Sponsorship and Setup
Legally, 401(k)s are employer-sponsored retirement plans governed by the Employee Retirement Income Security Act (ERISA). Employers set them up and often include matching contributions. In contrast, IRAs are opened individually, independent of employers, and are regulated under the Internal Revenue Code.
Contribution Limits
For 2025, the contribution limit for a 401(k) is $23,500, with an extra catch up $7,500 for those 50 or older. For an IRA, the limit is $7,000, with a $1,000 catch-up. These limits are set by the IRS and legally enforced.
Investment Choices
A 401(k) is tied to a plan administrator who selects investment options. You typically choose from a limited menu. An IRA, gives you full control, allowing investments in stocks, bonds, ETFs, and more. Generally speaking, if the custodian of your IRA allows an investment on their platform you are able to select it for your IRA.
Withdrawal Rules and Penalties
Both accounts penalize early withdrawals before age 59½ (10% plus income tax) however 401(k)s may offer loans, which IRAs legally don’t allow. Required Minimum Distributions (RMDs) also differ slightly: RMDs start at age 73, but Roth IRAs are exempt while Roth 401(k)s aren’t, unless rolled over into an Roth IRA.
Protection from Creditors
ERISA provides strong federal protection for 401(k) assets in bankruptcy and lawsuits. IRAs are protected, but only up to a limit ($1.5 million in bankruptcy as of 2025), and creditor protection varies by state.
Ultimately, the right choice depends on your employment situation and how much flexibility and control you want. Legally, both IRAs and 401(k)s serve the same goal—retirement—but they get there under different rules.