Most writing about employer 401(k) benefits is written to sell one. This page is written for the employer deciding whether to start or expand a plan, which means stating the benefits and the three costs in the same breath. The benefits are real: a plan is close to expected at many sizes, the tax treatment is favorable, and a match is one of the few benefits employees reliably value. The costs are a funding commitment, an administrative load, and a duty that does not go away when you outsource the work.
What the employer actually gets
Three things. A benefit that candidates ask about, which is worth something concrete in a market where several comparable offers are on the table. Favorable tax treatment of employer contributions, which makes the cost per dollar of perceived value good relative to cash. And a mechanism to move compensation into a form that vests over time, which a salary increase cannot do. Note that only the third of those does anything for retention by construction.
Cost one: the funding commitment, which scales with hiring
A match or a nonelective contribution is a percentage of pay, which means it grows with every hire and every raise. The IRS puts the 2026 elective deferral limit at $24,500, with an $8,000 catch-up at age 50 for traditional and safe harbor plans, so an employer matching a meaningful share of deferrals on a well-paid team is committing to a real number. It belongs in the headcount plan as a percentage of the roles it applies to, not as a benefits line.
Cost two: administration, and cost three: the duty
Administration is recordkeeping, testing, filings and participant communication, and it is buyable at a price. The duty is not. Selecting and monitoring the people who run the plan is a responsibility the employer holds as plan sponsor, and outsourcing the work does not outsource that. This site publishes no legal advice; what it will say is that the duty is written down, the Department of Labor publishes what it means, and an employer who has not read it has not finished the decision.
How to size it before you commit
Take the match or nonelective formula you are considering, apply it to your own salary list at a realistic participation and deferral rate, and put the annual figure beside your headcount plan for the next two years rather than this one. The number that matters is the commitment at the headcount you intend to reach, because that is when it is hardest to reverse. The free worksheet works the per-employee cost from your own figures.
Questions people ask about 401k benefits for employers
What is the strongest employer argument for a 401(k)?
Vesting. It is one of the few compensation instruments that can reward staying, which a salary increase cannot. The recruitment argument is real but weaker, because a plan is close to expected at many sizes and expected benefits win no offers.
What is the 2026 elective deferral limit?
The IRS puts it at $24,500 in 2026, subject to cost-of-living adjustments, with an $8,000 catch-up at age 50 for traditional and safe harbor 401(k) plans and a higher catch-up of $11,250 for the ages the rule names.
Does outsourcing the plan remove our responsibility?
No. Selecting and monitoring the providers is itself a duty the employer holds as plan sponsor. The Department of Labor publishes what that means and it is worth reading before signing, not after.
How should this appear in the headcount plan?
As a percentage of the pay of the roles it applies to, at the headcount you intend to reach rather than the one you have. A contribution formula is one of the few benefits costs that grows automatically with every hire and every raise.