Automatic Enrollment
Automatic enrollment is a 401(k) and other employer plan feature that enrolls eligible employees in the plan at a default contribution rate and investment allocation unless the employee affirmatively opts out, leveraging inertia to increase retirement plan participation rates.
Behavioral economics research, most notably from Richard Thaler and Shlomo Benartzi, established that employees default heavily toward inaction. Under traditional opt-in enrollment, many eligible workers never elect to participate even when participation would be clearly beneficial due to employer matching contributions. Automatic enrollment reverses the default to participation, significantly increasing plan participation rates — studies have consistently shown that automatic enrollment raises participation by 20 to 40 percentage points in populations where the feature is implemented.
The IRS recognizes three types of automatic enrollment safe harbor arrangements. A basic automatic contribution arrangement (ACA) automatically enrolls employees at a specified default deferral rate with no minimum escalation requirement, but the plan must meet nondiscrimination testing. A qualified automatic contribution arrangement (QACA) includes automatic escalation of the deferral rate by at least 1% per year until it reaches a minimum of 6%, and provides a safe harbor from top-heavy testing and ADP/ACP nondiscrimination tests if the employer makes specified contributions. An eligible automatic contribution arrangement (EACA) adds a 90-day permissible withdrawal window allowing accidentally enrolled employees to withdraw contributions without the 10% penalty.
The SECURE 2.0 Act of 2022 went further by mandating automatic enrollment for most newly established 401(k) and 403(b) plans starting in 2025. New plans must automatically enroll eligible employees at a default deferral rate of at least 3% but not more than 10%, with automatic annual escalation of 1% until the rate reaches at least 10% (and no more than 15%). Small businesses with 10 or fewer employees, businesses in their first three years of operation, church plans, and governmental plans are exempt from this mandate.
The default investment for automatically enrolled employees must be a qualified default investment alternative (QDIA). The DOL's QDIA regulations, issued in 2007, established safe harbors for three types of default investments: target-date funds, balanced funds, and managed accounts. A plan sponsor that selects a QDIA meeting the regulatory requirements is shielded from fiduciary liability for investment losses attributable to the default investment allocation, which was a critical protection needed to encourage widespread adoption of automatic enrollment.
Automatic escalation — also called auto-escalation or auto-increase — is a companion feature that automatically increases the default deferral rate over time, typically by 1% per year, until a specified cap is reached. Research shows that combining automatic enrollment with automatic escalation produces substantially higher account balances over a career than automatic enrollment alone, as participants tend to remain at whatever deferral rate they are set at rather than proactively adjusting it.