While many businesses and HR teams want to offer a 401(k) plan, compliance requirements and the possibility of administrative headaches might make it seem not worth it.
Luckily, there's a type of 401(k) plan that can help make offering retirement benefits easy: a Safe Harbor 401(k) plan.
What is a Safe Harbor 401(k) plan?
A Safe Harbor 401(k) plan is a special kind of retirement plan that automatically satisfies most annual nondiscrimination testing1, enables all employees to maximize their contributions, and reduces administrative work. This type of plan requires sponsors to make an employer contribution, which can encourage more employees to participate in the plan. When plan sponsors take this step, the IRS provides the plan sponsors with a "safe harbor" from certain nondiscrimination tests — and the consequences of failing those tests.¹
If this concept is new to you, you're not alone. Data from a recent survey found that more than half of retirement benefit decision-makers are unaware of, or unfamiliar with, Safe Harbor 401(k) plans.²
Of those who did know what a Safe Harbor 401(k) plan is, only one-third of them could correctly identify the plan design's marquee benefit — that it's a 401(k) plan design that satisfies most of the annual nondiscrimination tests.²
What are the benefits of a Safe Harbor 401(k) plan?
Below we'll take a look at just a few of the many ways a Safe Harbor 401(k) plan can help you, your employees, and your business:
1. Avoid the consequences of failing nondiscrimination testing1
Nondiscrimination testing is designed to prevent 401(k) plans from benefiting highly compensated employees (HCEs) at a disproportionately higher rate than non-highly compensated employees (NHCEs). The consequences of failure are either that HCEs receive a partial refund of their contributions or that the employer has to make additional contributions to NHCE employees' accounts (or a combination of both) — neither of which are ideal outcomes.
The nondiscrimination tests a Safe Harbor 401(k) plan automatically satisfies include:
Actual Deferral Percentage (ADP) test
Actual Contribution Percentage (ACP) test
In exchange for making a mandatory employer contribution, a Safe Harbor 401(k) plan shields you from most nondiscrimination testing, the administrative burden of compliance, and the results of failing those tests. Failing nondiscrimination testing can be common for small businesses and can prevent owners and HCEs from maximizing their savings each year. That's because all employees are benefiting from the plan — not just the ones earning the highest salaries.
2. Help employees maximize contributions with fewer worries
When you offer a Safe Harbor 401(k) plan with a match, employees have a easy path to saving for retirement. They may choose to contribute more knowing they're taking advantage of a great benefit: the employer match. And highly compensated employees will be even more motivated to maximize their 401(k) contributions without the risk of having their contributions refunded due to failing the nondiscrimination tests.
There are a few options for how you can contribute to Safe Harbor 401(k) plans, explained here. As long as you make a specified matching or non-elective contribution, you typically won't have surprise refunds or additional employer contributions at the end of the plan year.
3. Plan sponsors can save money on taxes
As the plan sponsor, you can enjoy additional tax savings for making Safe Harbor contributions. Employer contributions may be deductible as a business expense on your federal income tax return and are also generally free from payroll taxes.4
In fact, you may get more value out of these retirement plan contributions than from an outright bonus because of the variety of tax savings opportunities a Safe Harbor 401(k) plan offers.4
4. New plan sponsors can receive more than $16,500 in tax credits4
If you're an employer starting a new 401(k) plan, you could see significant tax savings from the SECURE Acts. These tax credits can directly lower your costs for setting up and running the plan.
Here's how the SECURE 1.0 Act (2019) and 2.0 Act (2022) can help new plans:
Small Business Retirement Plan Startup Tax Credit: This credit helps with the costs of setting up, administering, and educating employees about your new plan. Small businesses with up to 50 employees qualify for 100% of this credit. Small businesses with more than 50 but fewer than 100 employees can receive an annual tax credit up to 50% of start-up costs. The credit is a maximum of $250 per NHCE eligible employee but not more than $5,000 per year nor less than $500 per year, for each of the first three years. Qualified startup costs include the ordinary and necessary costs to set up and administer the plan (such as Form 5500) as well as money spent on employee education about the plan.
Automatic Enrollment Tax Credit: If your plan includes an eligible automatic contribution arrangement (EACA) or a qualified automatic contribution arrangement (QACA) feature, you can claim an additional tax credit of $500 per year for the first three years your plan includes the feature. If you use Gusto Retirement, all our 401(k) plans have auto-enrollment enabled by default, making it more likely you can claim this credit.
Employer Contribution Tax Credit: If you are a small employer (less than 100 employees) for contributions you make to the plan, you can claim up to $1,000 each year, per eligible employee (for employees earning under $100,000), for up to five years (100% for years 1 and 2, 75% for year 3, 50% for year 4 and 25% for year 5). The amount of the credit is reduced for sponsors with more than 50 employees. This additional credit means your total tax savings could be much higher than the combined $16,500 from the other two credits, especially if you contribute to many employees' accounts.
5. A Safe Harbor 401(k) plan can help you retain top talent
According to the SHRM Employee Benefits Survey, retirement benefits are the most important benefits to employees after health insurance. Employees are increasingly recognizing the significance of saving for retirement. To attract and retain top talent, offering a 401(k) plan — especially one with an employer contribution — can be just as impactful as a competitive salary and healthcare coverage.
By offering a company-sponsored 401(k) plan, you are not only providing a generous and popular benefit, you're also investing in your employees' retirement and incentivizing them to save for their future. This can help you recruit and keep new talent in an increasingly competitive marketplace.
6. Safe Harbor 401(k) plans are flexible for businesses of any size
There's a common misconception that Safe Harbor 401(k) plans are best-suited for small businesses. But in reality, with several Safe Harbor match and non-elective formulas to choose from, these plans offer the flexibility to fit in budgets of all shapes and sizes.
Though we've already touched on the benefits above, a Safe Harbor 401(k) plan can be a great solution for any employer looking to:
Simplify administration and avoid annual nondiscrimination testing: With a Safe Harbor 401(k) plan, you can bypass most of the complicated and time-consuming nondiscrimination testing required for traditional 401(k) plans.
Maximize contributions for HCEs: Safe Harbor 401(k) plans let any employee who wants to maximize their deferral do so.
Reap the tax benefits: A Safe Harbor 401(k) plan can provide tax advantages for both employers and employees.
Boost employee participation: Because Safe Harbor 401(k) plans require an employer contribution, they may encourage higher employee participation.
Attract and retain talent: Offering a 401(k) plan with a required employer contribution can demonstrate a commitment to employees, potentially making your company more attractive to new hires and helping retain your most valuable talent.
Need help setting up a Safe Harbor 401(k) plan? Gusto Retirement can help
While Safe Harbor 401(k) plans do have more requirements and regulations than a regular 401(k) plan, with the right provider, they don't have to be more complicated to administer than other retirement savings plans. At Gusto Retirement, we make it easy by handling most participant notice and disclosure requirements, employee and employer contributions, and timing requirements.5
See how other companies like yours are benefiting from sponsoring a Safe Harbor 401(k) plan and remember: October 1 is the final deadline for starting a new Safe Harbor 401(k) plan for 2026.
FAQs
What are the contribution requirements for a Safe Harbor 401(k)?
Employers must make either a matching contribution (typically matching 100% of the first 3% of employee deferrals plus 50% of the next 2% for traditional safe harbor or 100% up to 1% of employee deferrals plus 50% on next 5% for QACA safe harbor plans) or a non-elective contribution of at least 3% of compensation for all eligible employees, regardless of whether employees contribute. The specific formula can vary — Gusto Retirement explains the options here.
What tax credits are available when starting a Safe Harbor 401(k)?
New small plan sponsors can qualify for more than $16,500 in combined tax credits across three programs: the Small Business Retirement Plan Startup Credit (up to $5,000/year for 3 years), the Automatic Enrollment Credit ($500/year for 3 years), and the Employer Contribution Credit (up to $1,000 per eligible employee per year for 5 years). Consult a tax professional to determine your specific eligibility.
Who benefits most from a Safe Harbor 401(k) plan?
Small business owners and highly compensated employees generally benefit most, since Safe Harbor status eliminates the risk of contribution refunds due to failed nondiscrimination tests. However, any business that wants to simplify plan administration, boost employee participation, and offer a competitive retirement benefit can benefit from this plan design.
What is the deadline to start a Safe Harbor 401(k)?
October 1 is the deadline to establish a new Safe Harbor 401(k) plan for the current plan year (2026). Plans started after that date can still be set up as a traditional 401(k) but won't qualify for Safe Harbor treatment until the following year.
