Form 8881 is how a small employer claims four tax credits for offering a workplace retirement plan: the startup costs credit, the employer contributions credit, the auto-enrollment credit and the military spouse participation credit. To qualify you generally can't have had more than 100 employees who earned at least $5,000 from you in the year before, and the credits flow into the general business credit.
Everything below comes from the IRS Instructions for Form 8881 (Rev. December 2025), as of October 2026.
The four credits at a glance
| Part | Credit | Amount | How long |
|---|---|---|---|
| I, section 1 | Startup costs (section 45E) | 100% of qualified startup costs with 1 to 50 employees, 50% with 51 to 100, limited to the greater of $500 or the lesser of $250 per eligible non-highly compensated employee or $5,000 | The first credit year and the next 2 tax years |
| I, section 2 | Employer contributions (section 45E) | A percentage of employer contributions, up to $1,000 per employee | The first year the plan is effective and the next 4 |
| II | Auto-enrollment (section 45T) | $500 a year | The first year you add an eligible automatic contribution arrangement and the next 2 |
| III | Military spouse participation (section 45AA) | $200 per military spouse plus up to $300 of employer contributions for them | 3 successive tax years per employee |
The contributions credit shrinks each year
The employer contributions credit is 100% of qualifying contributions in the first and second years, 75% in the third, 50% in the fourth and 25% in the fifth, always capped at $1,000 per employee. If you had more than 50 employees in the preceding year, the percentage drops by 2% for each employee over 50. Elective deferrals don't count, and nor do contributions for an employee paid wages above $105,000 by you that year. A defined benefit plan doesn't qualify for this credit.
Here's the insight most owners miss: the startup credit can cover the whole cost of setting up the plan for an employer with 50 or fewer staff, but you must reduce your deduction for those startup costs, and for those contributions, by the credit you claim. It's a credit instead of a deduction, not on top of one.
Who's an eligible employer
- No more than 100 employees who received at least $5,000 of compensation from you in the tax year before the first credit year.
- For the startup and contributions credits: during the 3 tax years before, you didn't maintain a qualified employer plan with contributions or accruals for substantially the same employees.
- Members of a controlled group, businesses under common control and an affiliated service group count as one employer, and each member claims its share.
For the startup credit, the plan must have at least one eligible employee who isn't highly compensated.
What counts as a startup cost
Qualified startup costs are expenses paid or incurred to set up or administer an eligible employer plan, or to educate employees about retirement in connection with the plan. The first credit year is usually the year the plan takes effect, but you can elect to make the year before it the first credit year. The instructions give the example of a calendar-year employer whose plan starts on January 1, 2025: it can treat 2024 as the first credit year and claim startup costs paid in 2024 on its 2024 return.
Rules for the auto-enrollment and military spouse credits
The $500 auto-enrollment credit applies to the first tax year you include an eligible automatic contribution arrangement, as defined in section 414(w)(3), in a qualified employer plan, and to each of the following 2 years as long as you keep the arrangement at some point in that year. It uses the same 100-employee test but not the 3-year no-prior-plan rule.
The military spouse credit needs an eligible defined contribution plan. Military spouses you employ must be able to join no later than 2 months after they start, must immediately get the same employer contributions a comparable participant would get after 2 years of service, and must be immediately vested in benefits from employer contributions. The credit runs for 3 successive tax years per employee, starting with the first year that employee participates after the plan was adopted or amended to qualify.
Claiming it
- Check the eligibility tests above for the year before your first credit year.
- Part I, section 1: enter qualified startup costs and apply the 100% or 50% rate and the dollar limit.
- Part I, section 2: work out the contributions credit per employee on lines 6a to 6g.
- Part II: claim $500 if you added an eligible automatic contribution arrangement.
- Part III: claim the military spouse credit for each eligible employee.
- Carry the totals to Form 3800, and reduce your deductions by the credits.
If your only source of these credits is a partnership or S corporation, you don't file Form 8881; you report them directly on Form 3800. You can also choose not to claim the section 45E credit for a year by simply not claiming it on that year's return.
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The verdict
If you have 50 or fewer employees and no plan in the last 3 years, Form 8881 can make a new 401(k) or similar plan close to free to set up for 3 years and cut the cost of your contributions for 5. Add automatic enrollment and there's another $500 a year. Once the plan exists, keep its annual filing on Form 5500 (or Form 5500-EZ for a one-participant plan) on time.
Frequently asked questions
What is Form 8881?
It's the form small employers use to claim credits for retirement plan startup costs, employer contributions, automatic enrollment and military spouse participation.
How much is the small employer pension plan startup credit?
100% of qualified startup costs for employers with 1 to 50 employees and 50% for 51 to 100, limited to the greater of $500 or the lesser of $250 per eligible employee or $5,000, for 3 years.
Who qualifies for the Form 8881 credits?
Employers with no more than 100 employees who received at least $5,000 of compensation in the previous year. The startup and contributions credits also need no similar plan in the 3 years before.
How much is the auto-enrollment credit?
$500 for the first year you include an eligible automatic contribution arrangement and $500 for each of the next 2 years.
Can I deduct startup costs and take the credit?
No. You must reduce your deduction for startup costs by the amount of the credit.
