Form 8881: Small Employer Pension, Auto-Enrollment, Military Spouse

To fill out Form 8881, work through only the parts that match the credits your small business qualifies for — startup costs and employer contributions in Part I, auto-enrollment in Part II, and the military spouse credit in Part III — then carry the totals to Form 3800 and file it with your annual business return. The December 2025 revision runs 15 lines across those three parts, and most employers complete just one or two of them.

Before You Start

Confirm you’re an eligible employer. Under Section 45E, that means your business had no more than 100 employees who received at least $5,000 in compensation during the preceding tax year.¹ Count everyone over that pay threshold, not just plan participants. Your plan must also cover at least one non-highly compensated employee; if only owners or high earners are eligible, no credit is available.² For 2026, an employee is highly compensated if they owned more than 5% of the business in the current or preceding year, or earned more than $160,000 in 2025.³

One boundary worth checking now: the startup costs credit is off the table if your business, a predecessor, or another member of your controlled group maintained a retirement plan covering substantially the same employees during the three tax years before the first credit year.² Closing an old plan and opening a new one for the same workforce doesn’t reset that clock. SEPs, SIMPLE IRAs, and qualified plans like 401(k)s all count as eligible plan types.⁴

Have these numbers on hand before you open the form:

Employees paid $5,000 or more in the preceding tax year
Non-highly compensated employees eligible to participate in the plan
Qualified startup costs paid or incurred (plan setup fees, administration fees, employee education)
Employer contributions made for each employee, excluding elective deferrals and excluding employees who earned more than $105,000 in wages
Whether the plan includes an eligible automatic contribution arrangement
Any qualifying military spouses participating in the plan

The Four Credits on One Form

Form 8881 bundles four separate credits, each with its own rules. You can claim more than one in the same year — they stack.

The startup costs credit equals 50% of qualified startup costs, or 100% if you would still be eligible using a 50-employee cutoff.² The annual cap is the greater of $500 or $250 times the number of eligible non-highly compensated employees, up to $5,000. It runs three years: the first credit year plus the two that follow.

The employer contribution credit is capped at $1,000 per employee per year and phases down over five years: 100% in the plan’s establishment year and the year after, then 75%, 50%, and 25%.⁵ Employers with 50 or fewer employees get the full percentages. From 51 to 100 employees, the percentage drops by 2 points for each employee over 50, so an employer with 75 employees claiming during a “100%” year actually gets 50%.⁴ Contributions for employees earning more than $105,000 don’t count, and defined benefit plans don’t qualify.⁶

The auto-enrollment credit is a flat $500 per year for three years if your plan includes an eligible automatic contribution arrangement.⁷ Adding auto-enrollment to an existing plan starts the three-year window in that year.

The military spouse credit is up to $500 per qualifying military spouse per year for three successive years: $200 for participation plus up to $300 for employer contributions on that spouse’s behalf.⁸ The plan has to let military spouses enroll within two months of hire, vest them immediately in employer contributions, and treat them, for contribution purposes, as if they had two years of service. A military spouse for this credit is a non-highly compensated employee whose spouse is an active-duty member of the uniformed services as of the hire or rehire date. Written certification from the employee — naming the spouse’s rank, service branch, and name — is enough support.⁹

Part I: Startup Costs and Employer Contributions

Part I has three internal sections.

Section 1 (lines 1–5) handles startup costs. On Line A, enter the number of employees who received at least $5,000 in compensation during the tax year before your first credit year.⁶ Line 2 uses that count to set your credit base. Line 3 asks for non-highly compensated employees eligible to participate. Lines 4 and 5 walk through the math; the final startup credit on line 5 is the smaller of your credit percentage applied to costs, or the statutory cap (the greater of $500 or $250 times the line 3 number, up to $5,000).

Section 2 (lines 6a–6g) is the employer contribution credit. Line 6a takes your total employee count from the preceding tax year. Working from your records, calculate the qualifying contributions for each individual employee: drop anyone who earned over $105,000, and cap each employee’s counted contributions at $1,000 (or the higher per-employee ceiling that applies as the percentage phases down in later plan years). Enter the aggregate on line 6c. Line 6g applies the applicable percentage for your plan year.⁶

Section 3 (lines 7 and 8) adds the two credits together for the Part I total.

Part II: Auto-Enrollment

If your plan includes an eligible automatic contribution arrangement, enter the credit on line 9. For a standalone employer that’s simply $500. If you’re part of a controlled group or affiliated service group, compute your proportionate share of the $500, attach a statement showing the calculation, and write “See Attached” next to line 9.⁶ Lines 10 and 11 finish the section.

Part III: Military Spouse

Enter the number of qualifying military spouses who participated in your plan during the tax year, and the employer contributions made on their behalf. The form applies the per-spouse limits — $200 for participation and up to $300 for contributions — and produces the total on line 15.

Filing and What Happens to the Totals

Form 8881 doesn’t go to the IRS on its own. The credit totals from each part feed into Form 3800, General Business Credit, which combines all your business tax credits.¹⁰ That combined credit reduces the tax on your annual return: Form 1120 for C corporations, Form 1120-S for S corporations, Form 1065 for partnerships, or Schedule C with Form 1040 for sole proprietors and single-member LLCs.

Reduce your business deductions by the credit amount. A $3,000 startup costs credit means your deductible plan expenses go down by $3,000, and the same rule applies to the employer contribution credit against your deduction for employer contributions.⁶ You still come out ahead, since a dollar-for-dollar credit beats a deduction, but skipping the adjustment can trigger a notice.

If your credits exceed your tax for the year, unused amounts carry back one year or forward up to 20 years under the general business credit rules.¹¹

The First Credit Year Election

Your first credit year is normally the year the plan becomes effective, but you can elect to treat the preceding year instead.² If your plan is effective January 2026 and you paid setup costs in 2025, the election lets you start on your 2025 return. That moves the entire credit window a year earlier.

Mistakes That Trigger Notices

The most common error is miscounting employees for the 100-employee test. The count is for the preceding tax year and only includes employees who received at least $5,000 in compensation. Part-time workers who earned less don’t count toward the ceiling.

Claiming the employer contribution credit for elective deferrals — the money employees themselves put in — is another frequent mistake. Only employer-side contributions qualify, and only for employees earning $105,000 or less.⁶

Controlled-group employers sometimes each claim a full credit. All entities treated as a single employer under the aggregation rules share one set of credits and have to allocate proportionately.²

And the deduction offset. Taking the full credit and the full deduction for the same expenses creates a discrepancy IRS matching is built to catch.

1
Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts
2
Office of the Law Revision Counsel. 26 USC 45E – Small Employer Pension Plan Startup Costs
3
Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions
4
Internal Revenue Service. Retirement Plans Startup Costs Tax Credit
5
Office of the Law Revision Counsel. 26 US Code 45E – Small Employer Pension Plan Startup Costs
6
Internal Revenue Service. Instructions for Form 8881 (12/2025)
7
Office of the Law Revision Counsel. 26 USC 45T – Auto-Enrollment Option for Retirement Savings Options Provided by Small Employers
8
Office of the Law Revision Counsel. 26 USC 45AA – Military Spouse Retirement Plan Eligibility Credit for Small Employers
9
Internal Revenue Service. Instructions for Form 8881
10
Internal Revenue Service. About Form 8881, Credit for Small Employer Pension Plan Startup Costs
11
Office of the Law Revision Counsel. 26 US Code 39 – Carryback and Carryforward of Unused Credits