Most small business owners assume offering a retirement plan is an expense they cannot afford. Here is the part the conversation usually skips: for a company with 50 or fewer employees, the federal government will reimburse 100% of the cost of starting and running that plan for the first three years — and then hand you a second credit worth up to $1,000 per employee for the contributions you make on their behalf.
That is not a deduction. It is a dollar-for-dollar tax credit. A business that spends $5,000 a year administering a new 401(k) can wipe out $5,000 of its tax bill. Stack the contribution credit on top, and a small employer can plausibly run a retirement plan for the first few years at little or no net cost.
This is the Section 45E credit, supercharged by the SECURE 2.0 Act. Most eligible businesses never claim it — usually because nobody told them it existed or their payroll provider quietly set up the plan without flagging the tax form. This guide walks through who qualifies, exactly how much each credit is worth, the traps that shrink it, and how to claim it on Form 8881.
What Section 45E Actually Covers
Section 45E of the Internal Revenue Code gives eligible small employers a tax credit for the cost of establishing and administering a new qualified retirement plan. "Qualified plan" is broad — it includes 401(k) plans, SEP-IRAs, SIMPLE IRAs, and defined benefit plans.
There are really two credits living inside Section 45E, and they work very differently:
- The startup cost credit — covers the administrative cost of the plan itself.
- The employer contribution credit — added by SECURE 2.0, covers the money you contribute to employees' accounts.
Form 8881 also carries two smaller credits in adjacent code sections: the auto-enrollment credit (Section 45T) and the military spouse credit (Section 45AA). We will cover all four, but the two Section 45E credits are where the real money is.
Who Qualifies as an Eligible Employer
You are an eligible employer for a given year if you meet all three of these tests:
- The 100-employee test. You had no more than 100 employees who each received at least $5,000 in compensation in the year before the first credit year.
- The non-highly-compensated employee test. At least one employee covered by the plan is not a highly compensated employee (a NHCE). In practice this means an owner-only plan does not qualify — you need at least one rank-and-file worker in the plan.
- The no-recent-plan test. You did not maintain a qualified plan covering substantially the same employees during the three tax years immediately before the first year you are eligible for the credit.
That last rule matters. The credit is designed to reward new plans. If you terminated a 401(k) two years ago and start a fresh one, you generally have to wait out the three-year window before the new plan qualifies.
One more wrinkle: businesses under common control are treated as a single employer. You cannot spin up a small subsidiary to game the headcount test.
Credit #1: The Startup Cost Credit
This credit covers the ordinary and necessary costs of setting up the plan, administering it, and educating employees about it — think third-party administrator fees, recordkeeping charges, and the cost of enrollment meetings.
How much you get depends on your size:
| Number of employees | Percentage of qualified startup costs |
|---|---|
| 1–50 employees | 100% |
| 51–100 employees | 50% |
The dollar cap is the greater of $500, or the lesser of:
- $250 multiplied by the number of NHCEs eligible to participate in the plan, or
- $5,000.
So a business with 20 eligible non-highly-compensated employees can support a cap of $5,000 (20 × $250 = $5,000). A business with just three eligible NHCEs is capped at $750.
The credit is available for three years — the first credit year and the two that follow. A 1–50 employee business can therefore recover up to $15,000 of administrative costs over three years.
Watch the no-double-dip rule. You cannot both claim the credit for an expense and deduct that same expense. If you claim a $5,000 startup cost credit, you must reduce your deductible plan expenses by $5,000. The credit is still far more valuable than the deduction — a credit cuts tax dollar-for-dollar, while a deduction only saves you your marginal rate — but you do not get both.
Credit #2: The Employer Contribution Credit
This is the SECURE 2.0 addition, and it is the one most owners have never heard of. It rewards you for the actual contributions you make to employees' retirement accounts — matching contributions or nonelective contributions.
Here is how it works:
- The credit is a percentage of employer contributions, capped at $1,000 per employee per year.
- It is available for five years, starting with the year the plan becomes effective.
- The percentage declines each year: 100% in years 1 and 2, 75% in year 3, 50% in year 4, and 25% in year 5.
A concrete example. Suppose you have 15 employees, the plan is brand new, and you contribute $1,200 to each employee's account. The credit looks at $1,000 per employee (the cap), so your credit base is $15,000.
- Year 1: 100% × $15,000 = $15,000
- Year 2: 100% × $15,000 = $15,000
- Year 3: 75% × $15,000 = $11,250
- Year 4: 50% × $15,000 = $7,500
- Year 5: 25% × $15,000 = $3,750
Over five years, that single credit is worth $52,500 — for contributions you were going to make to retain your team anyway.
Two important limitations:
- High earners are excluded. Contributions made for any employee who earns more than the wage threshold (roughly $105,000 for 2026, indexed annually) do not count toward the credit. This keeps the benefit aimed at rank-and-file workers, not owners and executives.
- Elective deferrals do not count. Only your money — the employer match or nonelective contribution — counts. The salary your employees defer from their own paychecks is not part of the credit base.
The 51-to-100 Employee Phase-Out
If you have between 51 and 100 employees, the contribution credit shrinks. The applicable percentage is reduced by 2 percentage points for every employee over 50 you had in the preceding year.
Say you have 75 employees. That is 25 over the threshold, so the credit is reduced by 50% (25 × 2%). In year 1, instead of a 100% applicable percentage, you get 50%. In year 3, instead of 75%, you get 25%. A business with 100 employees (50 over the threshold) sees the contribution credit phase out entirely.
The startup cost credit also drops to 50% in this range. The clear message: the bigger the benefit, the smaller you need to be. Businesses with 50 or fewer employees get the full, undiluted package.
Credits #3 and #4: Auto-Enrollment and Military Spouse
Form 8881 carries two more credits worth knowing about:
- Auto-enrollment credit (Section 45T): Add an eligible automatic contribution arrangement to your plan and claim a flat $500 per year for three years — $1,500 total. SECURE 2.0 already requires most new 401(k) and 403(b) plans to auto-enroll, so for many businesses this credit is essentially free money for doing something they had to do anyway.
- Military spouse credit (Section 45AA): Employers that make plan participation easy for military spouses can claim $200 per military spouse plus up to $300 of contributions made for that spouse, for up to three years per employee.
These stack with the two Section 45E credits. A small employer launching a plan in 2026 can realistically be claiming the startup cost credit, the contribution credit, and the auto-enrollment credit all in the same year.
How to Claim It: Form 8881
The mechanics are straightforward:
- File Form 8881 — "Credit for Small Employer Pension Plan Startup Costs" — with your business income tax return. The form has separate parts for each of the four credits.
- The credit flows into the General Business Credit (Form 3800), which aggregates all your business credits and applies the ordering and limitation rules.
- Because it is part of the general business credit, an unused Section 45E credit generally carries back one year and forward up to 20 years if you cannot use it all in the current year. A pre-revenue startup with no tax liability does not lose the credit — it banks it.
A few practical tips:
- Know your first credit year. You can elect to begin the credit in the tax year the plan becomes effective, or the year before. Coordinate this with your accountant — starting early or late can change which years your costs fall into.
- Keep clean records of plan expenses. Separate the third-party administrator invoices, recordkeeping fees, and education costs from your other operating expenses. The cleaner that paper trail, the faster the credit gets calculated and the better it holds up if questioned.
- Track employer contributions per employee. Because the contribution credit caps at $1,000 per person and excludes high earners, you need contribution and compensation data at the individual-employee level, not just a lump-sum total.
A Bookkeeping Setup That Makes the Credit Easy
The single biggest reason eligible businesses underclaim Section 45E is messy records. When plan administration fees are buried inside a generic "professional fees" or "payroll expense" account, nobody can tell at tax time exactly what was spent or which costs qualify.
The fix is simple: give the retirement plan its own home in your chart of accounts. Create a dedicated expense account for plan administration costs and a separate one for employer retirement contributions. When the auditor or your CPA asks "what did you spend on the plan?", the answer is one report away — and the credit calculation practically writes itself.
This is exactly the kind of clarity plain-text accounting is built for. In a system like Beancount.io, you can tag every plan-related transaction and pull a clean total for any date range in seconds. A dedicated Fava dashboard view lets you watch plan costs and contributions accumulate against the credit caps throughout the year, so nothing is left on the table when you file.
Common Mistakes That Shrink the Credit
- Assuming an owner-only plan qualifies. It does not. You need at least one non-highly-compensated employee covered by the plan.
- Forgetting the three-year lookback. Restarting a plan too soon after terminating an old one disqualifies you until the window clears.
- Double-dipping on the deduction. Claiming the credit and deducting the same expense is an error that invites adjustment.
- Missing the contribution credit entirely. Many businesses claim the startup cost credit but never realize the separate, larger contribution credit exists.
- Ignoring the per-employee data. Without individual compensation and contribution figures, you cannot apply the $1,000 cap or the high-earner exclusion correctly.
- Letting the payroll provider file silently. Bundled "set up a 401(k)" services often establish the plan without ever generating or prompting Form 8881. The plan exists; the credit goes unclaimed.
Is It Worth It?
Run the numbers for a typical 15-person business launching a 401(k) in 2026:
- Startup cost credit: up to $5,000/year × 3 years = $15,000
- Contribution credit: up to roughly $52,500 over 5 years (from the earlier example)
- Auto-enrollment credit: $500/year × 3 years = $1,500
That is close to $69,000 in federal tax credits over five years for a business that decided to help its employees save for retirement. For many small employers, the credits cover the entire cost of running the plan during its early years — turning what felt like an unaffordable benefit into a near break-even one, with a more competitive compensation package as the bonus.
Keep Your Plan Costs Organized from Day One
The Section 45E credit rewards businesses that can clearly document what they spent setting up a retirement plan and what they contributed to employees' accounts. That documentation only exists if your books are structured to produce it. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in — so isolating plan expenses and employer contributions for Form 8881 is a quick query, not a year-end scramble. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
This article is for general informational purposes and is not tax or legal advice. Retirement plan rules and credit amounts are detailed and indexed annually — consult a qualified tax professional or plan advisor about your specific situation.