401(k) Plans for Startups

When you're building a startup, retirement benefits feel like a problem for later. But "later" has a cost — in talent you lose to companies that already offer a 401(k), in tax savings you miss every year you wait, and in your own retirement timeline as a founder.

The reality is that setting up a 401(k) is more affordable and simpler than most founders expect — especially with the tax credits introduced by SECURE 2.0. Here's how to think about it at each stage of growth.

When Should a Startup Offer a 401(k)?

There's no single right answer, but here are the milestones that typically trigger the conversation:

• Pre-revenue / solo founder: A Solo 401(k) lets you shelter up to $69,000/year in pre-tax income with minimal paperwork. If you're paying yourself, this should be in place from day one.
• First 2–5 hires: This is when a 401(k) becomes a competitive advantage. Engineers and experienced operators expect retirement benefits. A plan signals that your company is serious and stable.
• Fundraising milestones: After a Seed or Series A round, you have the cash flow to support employer contributions and the mandate to attract top talent. Investors expect you to build a real benefits package.
• 10+ employees: At this point, the absence of a 401(k) is a liability in recruiting. It's also where SECURE 2.0 tax credits make the net cost close to zero.

SECURE 2.0 Tax Credits Change the Math

The SECURE 2.0 Act introduced tax credits specifically designed to make retirement plans affordable for small and new businesses. For startups, this is a game-changer:

• Startup credit (Section 45E): Up to 100% of plan administrative costs are covered by a tax credit for the first three years, capped at $5,000 per year. For businesses with 50 or fewer employees, this means your recordkeeping, compliance testing, and TPA fees can be fully offset.
• Employer contribution credit: An additional credit of up to $1,000 per employee for employer contributions made during the first five years of the plan. This phases down — 100% for years 1–2, 75% for year 3, 50% for year 4, and 25% for year 5.
• Auto-enrollment credit: A $500 credit per year for up to three years for plans that include automatic enrollment.

For a startup with 10 employees, these credits can offset the full cost of the plan — administration and employer contributions — for the first two to three years. After that, the tax deduction on employer contributions continues to reduce the effective cost.

Which Plan Type Fits a Startup?

Your plan choice depends on your stage and headcount. Here's how to think about it:

Solo Founder / Pre-Hire

Open a Solo 401(k) immediately. It costs nothing to administer until assets exceed $250,000, gives you the highest possible contribution limit, and includes a Roth option. When you make your first hire, you'll need to transition to a standard plan — but the assets roll over seamlessly.

Early Stage (2–15 employees)

A Safe Harbor 401(k) is almost always the right call. It eliminates nondiscrimination testing (which startups often fail because founders are highly compensated relative to early employees) and the required employer contribution is predictable and tax-deductible. Pair it with a bundled provider like Guideline or Human Interest for turnkey administration.

Growth Stage (15–50+ employees)

At this point, your plan is a core part of your compensation package. You may want to explore enhanced match formulas, profit-sharing tiers, or even a cash balance plan layered on top of a 401(k) for maximum founder contributions. This is where working with an advisor who specializes in plan design pays for itself.

Plan Design Tips for Startups

• Use auto-enrollment at 6%: This dramatically increases participation rates (from ~40% to 90%+), helps your plan pass compliance tests, and qualifies you for the $500 auto-enrollment tax credit.
• Start with a basic Safe Harbor match: The basic match formula (100% on the first 3%, 50% on the next 2%) costs roughly 4% of payroll for participating employees — a manageable and predictable expense.
• Include a Roth option: Many startup employees, especially younger ones, prefer Roth contributions. It costs you nothing to include and makes the plan more attractive.
• Keep the investment menu simple: A target-date fund series and a handful of low-cost index funds is all you need. Overloading the menu with options leads to decision paralysis and lower enrollment.
• Set a reasonable vesting schedule: A 3-year cliff or 4-year graded vesting schedule on employer contributions protects you if employees leave early while still being fair.

Common Startup Mistakes

• Choosing a SEP IRA "for now": SEP IRAs are simpler but only allow employer contributions — employees can't defer their own salary. Once you offer a SEP, switching to a 401(k) requires terminating the SEP and communicating the change. Starting with a 401(k) avoids this transition.
• Ignoring the founder's own retirement: Many startup founders are so focused on the business that they neglect their personal retirement savings. A properly designed 401(k) is one of the most tax-efficient ways to build personal wealth.
• Not budgeting for employer contributions: If you choose a Safe Harbor plan, the employer match is a commitment, not a suggestion. Budget for it alongside payroll. Factor in the SECURE 2.0 credits when calculating your actual net cost.
• Late payroll deposits: Startups running fast often miss the 7-business-day deposit window for employee contributions. Automate this through payroll integration from day one — it's a compliance requirement, not a nice-to-have.

The Bottom Line

A 401(k) isn't just an enterprise benefit anymore. SECURE 2.0 credits, modern bundled providers, and cloud payroll integration have made it realistic for a 5-person startup to offer the same quality retirement plan as a Fortune 500 company — often at near-zero net cost for the first few years.

For a full walkthrough of plan types, costs, compliance, and setup timelines, see our complete guide to setting up a 401(k) for your business.