Retirement accounts are containers with rules. In a given year the IRS may raise the amount an employee can defer into a 401(k), or the amount that can go into an IRA. Those figures are limits on contributions. They are not yields.
The IRS sets those limits in an annual notice. For 2026, the employee deferral limit is $24,500, up from $23,500. The IRA limit is $7,500, and the ordinary catch-up is $8,000 for workers 50 and older. A higher catch-up, $11,250, applies at ages 60 to 63. None of it is an investment result.