Small Business 401(k) Costs: Setup, Fees, and Tax Credits

Small business 401(k) costs typically run between $2,000 and $7,000 per year in operating fees before employer contributions, with a one-time setup charge of a few hundred to a few thousand dollars on top. The range is wide because expenses scale with headcount, plan design, and provider. Federal tax credits introduced by the SECURE 2.0 Act can erase most or all of those fees for the first several years, so the sticker price and the real out-of-pocket price often look very different.

One-Time Setup Fees

Launching a 401(k) requires a plan document that complies with IRS and Department of Labor rules. Most providers charge a one-time setup fee of roughly $500 to $3,000. That covers drafting the document, configuring eligibility rules and loan provisions, integrating with payroll, and producing enrollment materials. More complex designs cost more. Some bundled providers roll setup into higher ongoing fees rather than billing it upfront.

Setup usually includes initial employee education so workers understand their investment options and contribution elections. Once the recordkeeping platform is live and employees are enrolled, recurring costs take over.

Ongoing Administrative Fees

Administrative fees keep the plan operational: recordkeeping, processing deferrals, generating statements, and maintaining the participant portal. Providers structure these charges differently. Some charge a flat annual fee, commonly $750 to $2,500. Others charge per participant, typically $20 to $100 a head per year. Many combine the two. A separate trustee fee may apply if you hire a third party to hold legal custody of plan assets.

When you compare provider quotes, ask exactly what the annual fee covers. Some administrators bundle nondiscrimination testing and Form 5500 preparation into the base price; others break them out as add-ons that can add several hundred dollars.

Investment Fees Participants Pay

Investment fees are the harder-to-see part of the cost picture. Every mutual fund or target-date fund on the plan’s menu charges an expense ratio, expressed as a percentage of assets under management. Ratios range from around 0.03% for basic index funds to 1.5% or more for actively managed funds. The money comes directly out of participant account balances, so employees bear this cost even though they rarely think about it. A Department of Labor publication on 401(k) fees notes that plan administration fees, investment fees, and individual service fees are the three main categories, and that even small differences in fees can substantially reduce retirement savings over time.¹

Many providers also collect revenue sharing payments from the mutual fund companies whose funds appear on the plan menu. The fund company pays the recordkeeper a portion of its expense ratio in exchange for tracking share ownership for each participant. This isn’t inherently bad, but it means part of what employees pay in investment fees subsidizes the plan’s administrative costs rather than being charged transparently to the employer. Ask any prospective provider whether investment fees include revenue sharing and what the all-in cost to participants looks like.

As the plan sponsor, you have a fiduciary duty to ensure fees are reasonable for the services provided. That doesn’t mean picking the cheapest option available, but you do need to review periodically what participants pay and whether cheaper alternatives exist. Benchmarking every two or three years against comparable plans is the practical way to stay on the right side of that obligation.

Employer Contributions

Over time, employer contributions dwarf every other 401(k) expense. A traditional plan doesn’t technically require the employer to contribute anything, but most businesses offer some kind of match to attract and retain workers.

The most common formula matches 50 cents on the dollar up to 6% of salary, which translates to a 3% employer cost on the compensation of every participating employee. Some companies match dollar for dollar on a smaller percentage. Actual budget impact depends on participation rates and salary levels, so modeling your own payroll is worth the time before committing.

Profit-sharing contributions are an alternative that gives the business more breathing room. Instead of tying contributions to employee deferrals, you contribute a percentage of annual profits. You can contribute generously in strong years and scale back when revenue drops. Total combined employer and employee contributions for any single participant can’t exceed the annual limit under Internal Revenue Code Section 415, which for 2026 is $72,000, or $80,000 for catch-up-eligible employees.² Employee elective deferrals are capped at $24,500 for 2026, with an $8,000 catch-up for those 50 and older and $11,250 for participants aged 60 through 63.³

One SECURE 2.0 change affects contribution budgets indirectly. Most new 401(k) plans must now enroll employees automatically, which pushes participation toward near-universal levels. Budget your match cost against that assumption rather than the 60% to 70% participation rates common before auto-enrollment became standard.

Safe Harbor Contribution Formulas

A safe harbor 401(k) is worth understanding because it eliminates the annual nondiscrimination testing that trips up many small businesses. In exchange, you commit to one of these employer contribution formulas:

Basic match: 100% of the first 3% of compensation each employee defers, plus 50% of the next 2%, which works out to 4% of compensation for employees who defer at least 5%.
Enhanced match: at least as generous as the basic match at every tier. A common version is a dollar-for-dollar match on the first 4% of compensation.
Nonelective contribution: 3% or more of every eligible employee’s compensation, regardless of whether they contribute themselves.

Safe harbor contributions generally must vest on a faster schedule than standard employer contributions, and you must provide employees written notice at least 30 days before the start of each plan year explaining the formula and their rights.⁴ For many small businesses, the guaranteed contribution cost is worth it because it removes the risk of failed nondiscrimination tests and the corrective distributions that follow.

Compliance Costs

Unless you’ve adopted a safe harbor design, your plan must pass annual nondiscrimination tests. The Actual Deferral Percentage and Actual Contribution Percentage tests verify that contributions for rank-and-file employees are proportional to those for owners and highly compensated employees.⁵ Some third-party administrators bundle testing into their annual fee. As a standalone service, expect $500 or more depending on plan complexity.

Failing these tests is more than an inconvenience. The plan must either refund excess contributions to highly compensated employees or make additional employer contributions to bring the plan into compliance. Either fix costs money, and the refund option can frustrate the owners and key employees who were counting on those deferrals.

Most 401(k) plans must also file Form 5500 with the Department of Labor each year. Professional preparation typically runs $300 to $1,000, and some administrators include it in bundled fees. The penalty for filing late is steep: up to $2,529 per day with no maximum, and the figure adjusts annually for inflation.⁶

Once your plan covers 100 or more participants at the start of the plan year, an independent financial audit by a CPA becomes mandatory. Audits typically run $8,000 to $15,000 per year, making the jump from 99 to 100 participants one of the most expensive thresholds in 401(k) administration. If you’re hovering near that number, understand the DOL’s counting rules before crossing the line.

Federal law also requires every person who handles plan funds to be covered by a fidelity bond protecting against fraud or dishonesty. The bond must equal at least 10% of the plan assets handled during the prior year, with a minimum of $1,000 and a maximum of $500,000, or $1,000,000 for plans that hold employer securities or participate as a pooled employer plan.⁷ For a small plan with $300,000 in assets, a bond of at least $30,000 typically costs a few hundred dollars a year in premiums. The bond is separate from optional fiduciary liability insurance, which covers you personally if you make a fiduciary mistake.

Tax Credits That Offset Most of the Cost

Federal tax credits can make the first several years of a 401(k) surprisingly cheap. These reduce your tax bill dollar for dollar, not just taxable income.

Startup Cost Credit

Businesses with 50 or fewer employees who earned at least $5,000 can claim a credit equal to 100% of eligible startup and administrative costs, up to $5,000 per year, for the plan’s first three years. Businesses with 51 to 100 employees get a credit worth 50% of those costs, subject to the same $5,000 cap.⁸ For a small employer paying $3,000 or $4,000 a year in administrative and recordkeeping fees, this credit can wipe out the expense entirely.

Employer Contribution Credit

A separate credit covers actual employer contributions to employee accounts. For businesses with 50 or fewer employees, the credit equals a percentage of contributions per participant, up to $1,000 per employee per year, on a declining schedule:

Years one and two: 100% of contributions, up to $1,000 per employee
Year three: 75%
Year four: 50%
Year five: 25%

After year five, the credit expires.⁸ For a business with 10 employees receiving the maximum credit, that’s up to $10,000 back on your tax return in each of the first two years.⁹

Automatic Enrollment Credit

Plans that include an automatic enrollment feature qualify for an additional $500 per year credit for three years. It applies both to new plans launched with auto-enrollment and to existing plans that add the feature.⁸

When a Cheaper Plan Type Makes More Sense

If you’re a business owner with no employees other than a spouse, a solo 401(k) offers the same contribution limits as a full 401(k) with far less overhead. There’s no nondiscrimination testing, no Form 5500 filing requirement for plans with less than $250,000 in assets, and many providers offer them with no annual administrative fees.¹⁰ The moment you hire employees who meet the plan’s eligibility requirements, you must include them, and standard testing and compliance costs kick in.

A SIMPLE IRA is often the cheapest plan to administer for businesses with roughly 100 or fewer employees. Setup is typically free or close to it, and ongoing administrative fees are minimal compared to a 401(k). The tradeoff is lower contribution limits: the 2026 employee deferral cap is $17,000, compared to $24,500 for a 401(k).³ Employers must either match employee contributions dollar for dollar up to 3% of compensation or make a flat 2% nonelective contribution for all eligible employees. For an owner who wants to maximize personal retirement savings or needs a Roth option and loan provisions, the 401(k) is worth the extra cost. For a business that just wants to offer something simple and affordable, the SIMPLE IRA delivers.

1
U.S. Department of Labor. A Look at 401(k) Plan Fees
2
Office of the Law Revision Counsel. 26 U.S. Code 415 – Limitations on Benefits and Contribution Under Qualified Plans
3
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026
4
Internal Revenue Service. Failure to Provide a Safe Harbor 401(k) Plan Notice
5
Internal Revenue Service. 401(k) Plan Fix-It Guide – The Plan Failed the 401(k) ADP and ACP Nondiscrimination Tests
6
Internal Revenue Service. 401(k) Plan Fix-It Guide – You Haven’t Filed a Form 5500 This Year
7
Office of the Law Revision Counsel. 29 U.S. Code 1112 – Bonding
8
Internal Revenue Service. Retirement Plans Startup Costs Tax Credit
9
Internal Revenue Service. Instructions for Form 8881
10
Internal Revenue Service. One-Participant 401(k) Plans