Check whether the 2025 automatic-enrollment mandate applies. Review exceptions, payroll defaults, employee choices, matching cost and oversight.
October 28, 2024 · Financial Forte Staff
Historical article: prepared retrospectively using information available as of October 28, 2024.
Automatic enrollment can improve access to a retirement benefit, but it is also a payroll process that must work correctly for every affected employee. With new federal requirements beginning for certain plans in 2025, the first question is whether the mandate applies to your arrangement. The second is whether the documents, notices and systems are ready to carry it out.
Review the plan's establishment history, employer facts and applicable exceptions before assuming that every 401(k) or 403(b) must change. Section 414A generally applies for plan years beginning after December 31, 2024, but it contains important exceptions. The IRS has issued initial guidance on establishment dates and related issues.[1][2]
Determine whether the requirement applies
Plans or arrangements established before the December 29, 2022 enactment date may qualify for an exception. For a 401(k) cash-or-deferred arrangement, the IRS looks to when the terms providing for that arrangement were initially adopted. A 403(b) plan has a related but distinct establishment rule. Find the signed documents rather than relying on the first payroll deduction date.[2]
Other exceptions require a separate look at the employer and arrangement. The statutory timing tests are more useful than a snapshot of today's payroll:[1]
| Possible exception | What to establish |
|---|---|
| SIMPLE 401(k), governmental or church plan | The arrangement meets the applicable legal definition. |
| New business | The employer, including any predecessor, has existed for less than three years. |
| Small business | The mandate cannot apply earlier than one year after the end of the first taxable year in which the employer normally employed more than ten employees. |
For example, if a calendar-year employer first normally exceeds ten employees in 2024, that small-business timing rule prevents application before January 1, 2026. Other exceptions and the plan-year rules still need review.[1]
An employer joining a multiple-employer plan after enactment should not assume the older age of the overall plan supplies its own exception. The statute treats that situation separately. Likewise, a merger or change in plan structure needs review before someone concludes that the arrangement's original date resolves everything.[1][2]
Document the conclusion and the facts supporting it. An exception from this mandate does not prevent voluntary automatic enrollment, and an existing automatic feature does not necessarily satisfy every requirement of the new law.
Translate the rule into the participant's experience
For an affected arrangement, the statutory initial default contribution rate is between 3% and 10%, with annual one-percentage-point increases under the prescribed schedule until reaching at least 10% and no more than 15%. Employees retain the ability to elect a different rate or not contribute. The default is the instruction applied when the employee does not make an affirmative choice.[1]
The arrangement also needs the required permissible-withdrawal and default-investment features. Payroll automation alone is not the complete design. Coordinate the plan document, participant notice, recordkeeper settings and investment process with the administrator.[1]
Consider a hypothetical company that establishes a new calendar-year 401(k) in 2023, has been operating for eight years and normally employs 40 people. Assume no exception applies. Its 2025 implementation review should address the mandate rather than treating automatic enrollment as merely an optional feature.
Suppose the selected initial default is 3% and an employee has $50,000 of eligible annual pay, evenly earned. A full year at that default would direct $1,500 of employee pay into the plan. An affirmative 6% election would instead direct $3,000 under the same assumptions. At evenly paid monthly compensation, those full-year deferrals average $125 and $250 a month respectively. The employee's actual choice must take priority over the default.
The payroll effect also depends on pre-tax or Roth treatment and the relevant taxes. Do not describe the gross deferral as necessarily equal to the reduction in take-home pay. Employees need an understandable explanation of the choice, where to make it and when the election takes effect.
Model employer cost as participation changes
Higher participation can increase matching contributions when the plan uses a match. Model the actual formula rather than assuming the new law requires a particular employer contribution. Automatic enrollment and safe harbor design are related planning considerations, but they are not interchangeable labels.
For the hypothetical company, assume its existing match is 50% of employee deferrals up to 6% of eligible pay. An employee at the 3% default would receive a 1.5% match under that formula; an employee deferring 6% would receive 3%. On $50,000 of pay, those employer amounts are $750 and $1,500 respectively.
If twenty otherwise identical employees defer 3%, that illustrative match would total $15,000 for a full year. Those figures illustrate the stated ordinary matching formula, not a claim that it meets safe harbor requirements. Estimate the workforce effect using reasonable participation and election assumptions, then compare actual results after implementation. An optimistic enrollment forecast should not become an unexamined budget commitment.
Include administrative costs as well: notices, payroll testing, election support, exception handling and provider fees. A clear process can reduce avoidable corrections, but it still requires time and ownership.
Test the full process before the first affected payroll
Use sample cases covering an employee who makes no election, one who opts out, one who chooses another rate and one whose status changes. Verify the treatment of existing elections, eligibility dates and escalation schedules with the administrator rather than assuming every employee is handled identically.
For an ERISA-covered plan, selecting and monitoring the default investment is part of the fiduciary process. A provider's recommendation does not remove the need to understand the option, its costs and the applicable requirements. Retain the decision and oversight records.[3]
Track two outcomes after launch: whether payroll applied the intended election or default, and whether the resulting contributions reached the correct accounts on time. A strong participation number is not sufficient if employees were deducted at the wrong rate.
Start with a documented applicability decision, then assign each implementation step to a named owner. The benefit of automatic enrollment depends on employees receiving clear choices and the employer carrying them out accurately. That makes preparation before January valuable for both employee confidence and operational risk.
Related reading
- Retirement Plan Tax Credits: Model the Net Cost Carefully
- Moving From SIMPLE IRA to 401(k): Plan the Transition
Have more questions about automatic enrollment and retirement plan implementation? Email Dave at dave@financialforte.com to discuss your questions and next steps.
The contact invitation is current; it does not imply this contact path existed on the historical reference date.
Educational information, not personalized investment, tax, legal or benefits advice. Examples use hypothetical assumptions. Verify current rules and your circumstances before acting.
