As a small business owner, you care a lot. You show it by working long hours, perfecting your products and services, and doing well by your team. But what if you’re missing out on one of the easiest ways to show that care? A Safe Harbor 401(k) plan can help your team build security for the future while maximizing your own retirement savings, too.
You’ve probably thought about retirement in some fashion, whether it’s independently with a financial advisor, or by selling your business someday (40% of small business owners plan to fund their retirement this way), or maybe you’re putting it off until business feels more stable.
In this article, you’ll see how a particular type of 401(k)—a Safe Harbor plan—can top all these methods. Spoiler: Owners on Gusto 401(k) Safe Harbor plans save 2.9x more than those who aren’t.¹
What Safe Harbor 401(k) plans actually are
Safe Harbor 401(k) plans were designed to help business owners who wanted to save for retirement alongside their teams but were hampered by compliance testing that is designed to keep 401(k) plans fair and balanced.
A Safe Harbor plan strikes a deal with business owners, which looks like this: If you make a certain contribution to your employees’ 401(k) accounts then the IRS won’t prevent you from maximizing your own contributions to the plan—even if your contributions are much larger than theirs. This means you won’t have to worry about balancing your own contributions against what your team chooses to contribute in order to avoid a refund.
With a Safe Harbor 401(k) plan, compliance is simplified and every party can benefit—the owner, the business, and employees.
What it means for you as an owner
Choosing a Safe Harbor 401(k) plan design can significantly affect how much owners can save. At Gusto, owners using Gusto 401(k) Safe Harbor plans save 2.9x more (a 11.6% deferral rate) than owners with other plan designs that limit how much they can defer based on what their team is deferring (a 4% deferral rate).¹
There are benefits to your business, too. With tax-deductible contributions and SECURE Act credits,³ the net cost is often lower than you might expect. Plus, you get to build your own retirement savings too.
Here’s how it works out:
Increased owner savings. With no compliance cap, you may actually be able to reach your contribution limits, which is $24,500 in 2026 (with an $8,000 extra in catch-up contributions for ages 50-59 or 64+, or $11,250 catch-up for ages 60-63).⁴ Plus, as your own employee, you can double-dip by receiving your employer match too. At Gusto, owners with Gusto 401(k) Safe Harbor plans are 3.3x as likely to hit the recommended 15% savings rate.¹
Tax credits for employer contributions. When you contribute to Safe Harbor employee 401(k) plans, you can claim up to $1,000 in tax credits per eligible employee for up to five years (the amount decreases by year).³
Tax credits help cover plan costs. The SECURE Acts provide tax credits for new plans, including credit for plan startup and automatic enrollment.³ (With Gusto, you don’t have to worry about forgetting to claim the tax credits. We’ll prepare the SECURE Act tax forms for you.⁷)
The example below shows how the math could work in your favor.
Example: Marta, owner of a marketing agency
Marta started her own marketing agency that employs nine other people.⁵ She's always thought a 401(k) plan would cost the business, with little benefit for her.
When she looked into a traditional 401(k), her tax advisor warned her that nondiscrimination testing could limit how much she could personally contribute if her team's participation was low as she is the only owner/HCE. Since she pays herself $200,000/year, that would cap her own contributions around $12,000/year (assuming her team’s average deferral rate was 4%), significantly below the IRS contribution limit.
By starting a Safe Harbor 401(k) instead, her situation changes:
Standard 401(k) (capped by testing) | Safe Harbor 401(k) | |
Marta's personal retirement savings | $12,000 (her employee deferral only with no match) | $32,500 (Her $24,500 employee deferral + 4% employer match) |
She’d be able to contribute nearly 3x more into her own retirement account.
But what would that advantage cost the business?
Under the Safe Harbor plan, Marta needs to contribute to her nine employees’ 401(k) plans. The average employee salary is $60,000, and with her choice of the 4% match, the business could end up contributing up to $2,400 to each employee if they all defer enough for the max match. For comparison, giving all 9 employees a 4% raise would end up costing the business ~$33k more over the first six years, and they wouldn’t get the tax savings benefit either. See how it nets out for the first six years of the plan with the included tax credits:
Year 1 | Year 2 | Year 3 | Year 4 | Year 5 | Year 6 | 6-Yr Total | |
Plan fee minus tax credits | $0 | $0 | $0 | $2,750 | $2,750 | $2,750 | $8,250 |
Net match cost | $12,600 | $12,600 | $14,850 | $17,100 | $19,350 | $21,600 | $98,100 |
Total cost to offer 401(k) | $12,600 | $12,600 | $14,850 | $19,850 | $22,100 | $24,350 | $106,350 |
Cost of 4% raise instead | $23,256 | $23,256 | $23,256 | $23,256 | $23,256 | $23,256 | $139,536 |
Figures are for illustration only and will vary based on plan design, employee census, and your specific tax situation. Assumes all employees other than Marta earn under $100,000. 3, 5
For about a $12,600 cost in year one, Marta gained an extra $20,500 in her own retirement savings that will compound over time, while providing a valuable benefit for her team.
See what a Safe Harbor 401(k) plan would cost your business.
What it means for your team
Offering a retirement match is proven to increase the chances that your employees will save. Among Gusto 401(k) customers, when employers offer a Safe Harbor plan, about 9 out of 10 employees participate.1
You’re also giving your team a chance to save in a way they couldn’t otherwise, since 401(k)s are only available through employers (and IRAs have much lower savings limits).
As a business owner, it feels good to be able to provide your team with tools to help them today and tomorrow. A Safe Harbor 401(k) can make that legacy last longer than their tenure at your company.
The deadline reality of Safe Harbor
If you decide to opt into a new Safe Harbor plan, IRS rules dictate that your plan needs to be live by October 1 to qualify for the 2026 tax year. If you already offer a 401(k) plan, you generally have until December 1 to add a Safe Harbor match provision for the next year.³ These deadlines come up quickly—and every year you wait is a year you and your team miss out on tax-deductible savings.
If you hire employees in certain states including California, New York, or Illinois, offering a retirement plan may not even be optional. State retirement mandates already require many employers to offer a retirement benefit—either via a state run IRA program or a qualified alternative like a 401(k).⁸ With that in mind, a Safe Harbor plan might make the most financial sense for you and your business.
How Gusto Retirement makes offering Safe Harbor plans simple
Investing in your future doesn’t take long when you have Gusto Retirement on your team.
If you decide you should get a Safe Harbor 401(k), Gusto Retirement will handle your plan setup, administration, and compliance⁶—and prepare the tax forms you need to get SECURE Act tax credits.⁷ Join the 60%1 of Gusto 401(k) customers who’ve chosen a Safe Harbor plan1 today.
Calculate how much a Safe Harbor 401(k) would cost your business.
FAQs
Why do I need a Safe Harbor provision to max out my 401(k) as an owner?
The IRS runs nondiscrimination testing each year to make sure a 401(k) plan doesn't disproportionately benefit HECs and "key employees,” which usually includes owners. If your team's participation or savings rate is low, that testing can cap your contributions well below the IRS limit, sometimes by tens of thousands of dollars. A Safe Harbor provision automatically satisfies most testing requirements, in exchange for guaranteeing a contribution to your employees' accounts.²
Is a Safe Harbor 401(k) better than a traditional 401(k) for owners?
For owners who want to contribute close to the IRS maximum but aren’t sure if their employees will do the same, a Safe Harbor plan can be more advantageous. A Safe Harbor plan removes the compliance cap that traditional plans impose when employee participation is low.2 In Marta’s example above, that difference meant contributing $32,500 instead of being capped near $12,000.⁵
Do I have to match every employee's contribution with Safe Harbor?
Yes, a Safe Harbor plan requires a defined employer contribution, either a match (commonly 4% of pay for participating employees) or a non-elective contribution (typically 3% of pay for all eligible employees, whether or not they participate). The exact formula you choose affects both your cost and available tax credits.³
How much does a Safe Harbor 401(k) cost a small business?
The cost to sponsor a Safe Harbor 401(k) depends on your employee count, salaries, and match formula, but startup tax credits and employer contribution credits can offset most of the expense in the early years. In the example in this article, a nine-employee agency's net cost came out to roughly $12,600 in year one after credits, far less than the $21,600 price of the match itself.3, 5
What's the deadline to set up a Safe Harbor 401(k)?
To qualify for the current tax year, new plans generally need to be active by October 1, and businesses adding a Safe Harbor match provision to an existing 401(k) have until December 1 to add for the next year. Adding a Safe Harbor nonelective provision to an existing plan has more liberal deadlines. Missing these dates may mean waiting until the following year to start saving at the higher rate.³
Disclosures
¹ Based on Gusto internal analytics as of June 2026.
² In general, Safe Harbor 401(k) plans automatically satisfy Top Heavy requirements. One exception is for plan years in which the employer makes discretionary contributions (such as profit sharing contributions) in addition to Safe Harbor contributions. Removing Safe Harbor contributions mid-year will also require plans be subject to all compliance testing.
³ This content is for informational purposes only and is not intended to be taken as tax advice. You should consult a tax professional to determine what types of tax credits or deductions your company is eligible to claim.
⁴ May be adjusted annually to account for IRS cost-of-living adjustments.
⁵ These are hypothetical examples for illustrative purposes only and do not represent any current or past client accounts.
⁶ All plans of related entities must be administered by Gusto Retirement in order to provide compliance testing.
⁷ Tax credit services provided by Gusto, Inc. Please contact a financial, tax, and/or legal advisor to determine if their applications and products are appropriate for your specific circumstance. Gusto is not a fiduciary when providing this service.
⁸ This information is general in nature and is for informational purposes only. It should not be used as a substitute for specific tax, legal and/or financial advice that considers all relevant facts and circumstances. Deadlines, fees, and other program details are subject to change by the state without notice and should be checked prior to making any decisions.
