The Employer’s Guide to Offering a 401(k) Plan

May 10th, 2026

Most small business owners are well aware of how difficult it is to attract (and keep) great employees. It can be difficult to compete with larger employers on salary, which makes it all the more important to be able to offer some workplace benefits and a 401(k) plan ranks near the top of what job seekers look for.

If you’re a small or midsize business owner who hasn’t yet offered a retirement plan (or are reconsidering the one you have), this guide covers the basics you need to get started.

Why Offer a 401(k) in the First Place?

Beyond the recruiting and retention advantages, a 401(k) plan delivers real financial benefits to you as an employer:

• Contributions you make on behalf of employees are generally tax-deductible as a business expense.
• The administrative costs of running the plan may be deductible as well.
• If your business is new to offering a 401(k) (or certain other retirement plans, for that matter), you may qualify for a federal tax credit — up to $5,000 per year for the first three years — to offset startup costs.
• An additional $500 credit is available if you add an automatic enrollment feature.

In short, a well-designed 401(k) isn’t just a gift to your employees. It’s a smart financial move for your business.

The Basic Mechanics of Setting One Up

Setting up a 401(k) involves several moving parts, but the process is manageable when broken into steps.

First, you’ll need to choose a plan provider. This is typically a financial institution, brokerage or dedicated retirement plan administrator. They’ll help you establish a plan document — the legal foundation of your 401(k) that spells out all the rules governing eligibility, contributions, vesting and distributions.

Next, you’ll make decisions about plan design. Who is eligible to participate? When? Will you offer employer contributions? How will vesting work? These choices shape the experience for your employees and the cost to your business.

Once the plan is established, you’ll need to set up a trust. The trust will hold plan assets, select the investment options available to participants and create a process for employees to enroll and make contribution elections.

From there, you’ll perform ongoing administration. This includes payroll integration, recordkeeping and annual reporting to keep the plan running and compliant.

Traditional vs. Safe Harbor Plan Design

One of the most consequential design decisions you’ll make is whether to set up a traditional 401(k) or a safe harbor 401(k).

A traditional 401(k) gives you flexibility. You can choose whether to make employer contributions, and if so, how much. Same with vesting. The tradeoff is that traditional plans are subject to nondiscrimination testing. Specifically, they’re subject to the Actual Deferral Percentage (ADP) or Actual Contribution Percentage (ACP) tests, as well as the top heavy test, which are designed to ensure that highly compensated employees aren’t benefiting disproportionately compared to rank-and-file workers. If your plan fails these tests, you may be required to refund contributions to higher earners or make corrective contributions, which creates administrative headaches.

A safe harbor 401(k) comes in two types: classic and Qualified Automatic Contribution Arrangement (QACA), the latter of which includes automatic enrollment options.

Safe harbor 401(k)s differ from traditional 401(k)s in several ways, but most important are that:

• They largely sidestep the IRS nondiscrimination tests, with only a few exceptions.
• They require you to make employer contributions. Your contribution options are:
  • Basic match (Classic): 100% of the first 3% of compensation, then 50% on the next 2% of compensation (4% total)
  • Basic match (QACA): 100% of the first 1% of compensation, then 50% on the next 5% of compensation (3.5% total)
  • Enhanced match (Classic, QACA): Must be the same if not more of the basic match at each tier. (Commonly 100% match on the first 4% of compensation in classic plans, and the first 3.5% in QACA plans.)
  • Nonelective contribution (Classic, QACA): At least 3% of compensation regardless of salary deferrals.
• Employer contributions generally must vest 100% immediately.

Understanding Your Fiduciary Duties

When you sponsor a 401(k) plan, you take on fiduciary responsibilities, which aren’t to be taken likely.

A fiduciary is someone who is required by law to act in the best interest of plan participants, not in their own interest or the interest of the business. In practical terms, your fiduciary duties include:

• Duty of care: You must keep yourself as well-informed as possible so you can make good decisions on behalf of your beneficiaries.
• Duty of confidentiality: You must keep information confidential and not use that information for personal gain.
• Duty to disclose: You must always disclose relevant information that could impact your actions or ability to carry out your duties.
• Duty of good faith: When advancing the interests of the beneficiary, you must always act within legal constraints.
• Duty of loyalty: You must always act in the beneficiary’s best interest.
• Duty of prudence: You must make plan decisions, particularly around selecting and monitoring investment options, with a high level of care and risk awareness.

Employers who breach these duties can be held personally liable. Working with qualified advisors and documenting your decision-making process are two of the best ways to protect yourself.

Staying Compliant Over Time

A 401(k) isn’t a set-it-and-forget-it arrangement.

Ongoing compliance obligations include filing Form 5500 with the IRS each year, providing required disclosures to participants, and (for most plans) conducting an annual audit once the plan reaches 100 or more eligible participants.

Plan documents also need to be updated periodically to reflect changes in the law.

Legislation like the SECURE Act and SECURE 2.0 Act has introduced a range of changes to retirement plan rules in recent years, including expanded tax credits, new automatic enrollment requirements for many plans established after Dec. 29, 2022, and more. Staying current on these changes is part of responsible plan sponsorship.

Ready to Explore a 401(k) for Your Business?

Offering a 401(k) is one of the most meaningful benefits you can provide for your employees’ financial futures and for your own. But the rules are detailed, the fiduciary stakes are real, and the decisions you make at the outset will shape the plan for years to come. Getting expert guidance from the start can save you significant time, money and headaches.

McManamon & Co. is an accounting, tax, fraud, forensic and consulting firm serving small and midsize businesses across Northern Ohio and South Carolina. Our consulting team can help you think through the financial and tax dimensions of establishing a retirement plan, so you can make informed decisions and set your business up for success.

Call us at 440.892.8900 or contact us online to start the conversation.

Tags:  benefits, hiring, McManamon, McManamon & Co., small business, small business accounting | Posted in McManamon & Co., Retirement Planning