401(k) Auto-Enrollment: New Secure 2.0 Act Rules

Retirement planning in the United States is undergoing a significant structural shift due to the SECURE 2.0 Act. While this legislation includes dozens of provisions, the mandate for automatic enrollment is arguably the most impactful change for employers and workers alike. Starting in 2025, the way employees join company retirement plans will fundamentally change from an “opt-in” system to an “opt-out” system.

Understanding the New Auto-Enrollment Mandate

The SECURE 2.0 Act, signed into law in late 2022, aims to increase retirement readiness across the country. The centerpiece of this effort is the requirement found in Section 101 regarding automatic enrollment.

Effective for plan years beginning after December 31, 2024, virtually all new 401(k) and 403(b) plans must automatically enroll eligible employees. This means that if you start a new job at a company that recently launched a retirement plan, a portion of your paycheck will be directed into a retirement account by default. You do not need to fill out paperwork to join; you only need to fill out paperwork if you wish to decline participation.

The Specifics of Contribution Rates

The law is very specific about how much money is diverted into these accounts. It removes the guesswork for employers by setting strict floors and ceilings for contribution rates.

  • Initial Enrollment Rate: Employers must enroll staff at a rate of at least 3% but not more than 10% of their eligible wages.
  • Automatic Escalation: Enrollment is just the first step. The legislation requires an automatic increase feature. The contribution rate must increase by 1% each year following the initial enrollment.
  • The Ceiling: This annual increase continues until the contribution reaches at least 10%, but it cannot exceed 15%.

For example, if an employee earning $60,000 is enrolled at 3%, they will contribute $1,800 in year one. In year two, the system will automatically bump them to 4%, then 5%, and so on, until they hit the statutory cap or the cap set by the specific plan.

Which Companies Are Affected?

It is vital to note that this mandate does not apply to every single business in America immediately. Congress included a “grandfather clause” and several exemptions to protect small businesses and existing plan sponsors.

The Grandfather Clause

The most significant exemption applies to existing plans. If a company established their 401(k) or 403(b) plan before December 29, 2022, they are generally exempt from the mandatory auto-enrollment rules. They can choose to add auto-enrollment voluntarily, but the law does not force them to modify their current plan structure.

Specific Exemptions

Even for plans created after the 2022 cutoff, the law provides exceptions for businesses that might struggle with the administrative or financial burden:

  1. Small Businesses: Companies with 10 or fewer employees are exempt. Once a company grows beyond 10 employees, they generally have a grace period before they must comply.
  2. New Businesses: Companies that have been in business for less than three years are not required to implement auto-enrollment. This allows startups to stabilize their cash flow before managing complex benefits compliance.
  3. Governmental and Church Plans: These organizations are generally not subject to the new mandate.

Employee Rights and Opting Out

A common misconception is that this law forces employees to save against their will. This is false. The SECURE 2.0 Act changes the default action, but it preserves employee choice.

Employees retain the right to:

  • Opt-out completely: An employee can choose to contribute 0% of their paycheck.
  • Change the rate: An employee can manually adjust their contribution to be lower or higher than the automatic settings.
  • Withdraw early contributions: Under permissible withdrawal rules, if an employee is auto-enrolled but decides within 90 days that they do not want to participate, they can withdraw their contributions without the typical 10% early withdrawal penalty. They will only pay income tax on the amount.

The goal of the legislation is to overcome “inertia.” Behavioral finance studies show that when employees must fill out a form to join a plan, many procrastinate and never join. When they are added automatically, the vast majority stay in the plan and begin building wealth.

Default Investments

If an employee is automatically enrolled, they often do not select a specific mutual fund or stock for their savings. In these cases, the employer must direct the contributions into a Qualified Default Investment Alternative (QDIA).

Typically, a QDIA is a target-date fund. For instance, a 30-year-old employee might be defaulted into a “Target Retirement 2060 Fund.” These funds are diversified and automatically adjust their risk level, becoming more conservative as the employee approaches retirement age. This ensures that unwilling or passive investors are not left in cash or high-risk assets by mistake.

Tax Credits for Employers

To encourage compliance and offset costs for smaller businesses, the government offers significant tax credits.

  • Startup Cost Credit: Small employers (under 50 employees) can claim a tax credit for 100% of the administrative costs to set up a new plan, up to $5,000 per year for the first three years.
  • Employer Contribution Credit: There is an additional credit for employer matching contributions. This credit can be up to $1,000 per employee. It covers 100% of the contribution in the first and second years, then drops to 75%, 50%, and 25% in subsequent years before phasing out.

These incentives make it financially viable for small businesses to offer plans that comply with the new auto-enrollment regulations.

Frequently Asked Questions

Does this affect my current 401(k) plan? If your company’s plan existed before December 29, 2022, they are likely not required to change anything. However, if your company starts a new plan in 2025 or later, these rules will apply.

Can I stop the automatic contribution increases? Yes. While the plan must automatically increase your rate by 1% annually, you can log into your retirement account portal and freeze your rate or change it to whatever percentage you prefer.

What happens if I change jobs? If you move to a new employer with a plan created after the 2022 cutoff, you will likely be auto-enrolled again, even if you opted out at your previous job. You will need to make a new election to opt out or adjust your rate at the new company.

Is there a maximum amount I can be forced to contribute? The law caps the automatic escalation at 15%. However, the IRS sets an annual limit on total 401(k) employee deferrals ($23,000 for 2024). The auto-enrollment percentage cannot cause you to exceed this federal dollar limit.