12.3 IRC §401(a)(17) Annual Compensation Limit & Deemed / Partial Year Rules
Key Takeaways
- IRC §401(a)(17) imposes an absolute statutory ceiling on the annual compensation that can be recognized for any participant in a qualified plan ($345,000 in 2024, $350,000 in 2025, and $360,000 in 2026), indexed in $5,000 increments under §401(a)(17)(B).
- The §401(a)(17) cap applies to all plan operations: calculating employee deferral withholdings, determining employer matching and profit-sharing allocations, performing nondiscrimination testing (ADP/ACP and §401(a)(4)), and calculating top-heavy minimums.
- Under Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(A), the annual compensation cap must be prorated on a monthly or daily basis whenever a plan has a short plan year of less than 12 months (e.g., in an initial, amended, or terminating plan year).
- Under Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(B), the annual compensation cap is NEVER prorated for an individual participant simply because they enter mid-year or terminate mid-year in a full 12-month plan year.
- Under IRC §414(b), (c), and (m), all entities within a controlled group or affiliated service group share a single §401(a)(17) limit; family aggregation rules were repealed by the Small Business Job Protection Act of 1996 for plan years beginning after December 31, 1996.
12.3 IRC §401(a)(17) Annual Compensation Limit & Deemed / Partial Year Rules
[!NOTE] The Statutory Ceiling on Tax-Favored Benefits A foundational principle of the federal qualified retirement plan framework is that tax-sheltered retirement vehicles must not be utilized as disproportionate tax shelters for highly compensated executives. To enforce this policy, Congress enacted IRC §401(a)(17). Under this statutory mandate, a trust forming part of a pension, profit-sharing, or stock bonus plan constitutes a qualified trust under IRC §401(a) only if the annual compensation of each employee taken into account under the plan for any year does not exceed the statutory dollar limit. Any contribution allocated, benefit accrued, or nondiscrimination test conducted using compensation in excess of this statutory ceiling constitutes a catastrophic qualification defect.
For Qualified 401(k) Administrators (QKAs), IRC §401(a)(17) is not just a static dollar number found on an IRS annual table—it is an active operational compliance rule that dictates payroll system programming, mid-year entry calculations, short plan year proration, and multiple-employer aggregation.
Statutory Framework & Cost-of-Living Indexing: IRC §401(a)(17)(B)
Under IRC §401(a)(17)(B), the statutory compensation cap is indexed annually for inflation in accordance with regulations prescribed by the Secretary of the Treasury. Cost-of-living adjustments (COLA) are rounded down to the next lowest multiple of $5,000.
Historical and Recent Compensation Limits:
- 2023: $330,000
- 2024: $345,000
- 2025: $350,000
- 2026: $360,000
Scope of Application
The statutory compensation cap under IRC §401(a)(17) applies universally across four major operational plan areas:
- Allocation and Accrual Formulas: An employer contribution (whether matching, discretionary profit-sharing, or safe harbor) cannot be calculated on compensation exceeding the cap. An employee earning $600,000 in 2026 under a 5% profit-sharing formula receives an allocation based on $360,000 ($18,000), not $600,000 ($30,000).
- Participant Elective Deferrals: While the annual dollar limit on elective deferrals is governed separately by IRC §402(g) ($23,500 in 2025; $24,500 in 2026), plan payroll systems must track compensation up to the §401(a)(17) cap. Once an employee's recognized compensation reaches the cap, plan terms often cease deferral deductions.
- Nondiscrimination Testing: In performing the Actual Deferral Percentage (ADP) test, Actual Contribution Percentage (ACP) test, Section 410(b) Average Benefits Test, and Section 401(a)(4) general nondiscrimination testing, each participant's ratio must be calculated by dividing their contributions by compensation capped at the §401(a)(17) limit.
- Top-Heavy Minimum Allocations (IRC §416): Top-heavy minimum contributions (generally 3% of compensation for non-key employees) are calculated using compensation capped at the §401(a)(17) limit.
Which Limitation Year Applies?
Under Treasury Regulation §1.401(a)(17)-1(b)(3)(ii), the annual compensation limit applied to a plan year is the limit in effect for the calendar year in which the plan year begins. For example, for a fiscal plan year running from July 1, 2025 through June 30, 2026, the applicable §401(a)(17) limit is the 2025 limit ($350,000), because the plan year began in calendar year 2025.
The Short Plan Year Proration Rule: Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(A)
A critical compliance mandate frequently examined on ASPPA QKA exams is the mandatory proration of the §401(a)(17) cap when a plan operates for a short plan year (a plan year of less than 12 months).
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| SHORT PLAN YEAR PRORATION UNDER IRC §401(a)(17) |
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| |
| Under Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(A), if a plan determines compensation over a |
| period of less than 12 months, the statutory limit MUST be prorated: |
| |
| Number of Months in Short Plan Year |
| Prorated Limit = ─────────────────────────────────────── × Full Annual Statutory Limit |
| 12 |
| |
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When Do Short Plan Years Occur?
- Initial Plan Establishment Mid-Year: An employer establishes a new calendar-year plan with an effective date of July 1, 2025. The initial plan year runs from July 1, 2025 through December 31, 2025 (a 6-month short plan year).
- Plan Year Change / Fiscal Year Amendment: An employer amends its plan year from a fiscal year ending June 30 to a calendar year ending December 31. This creates a 6-month short plan year running from July 1, 2025 through December 31, 2025.
- Plan Termination Mid-Year: An ongoing calendar-year plan is formally terminated effective September 30, 2026. The final plan year is a 9-month short plan year running from January 1, 2026 through September 30, 2026.
Short Plan Year Proration Reference Table
| Duration of Short Plan Year | Fraction of Year | 2024 Prorated Limit ($345,000) | 2025 Prorated Limit ($350,000) | 2026 Prorated Limit ($360,000) |
|---|---|---|---|---|
| 3 Months (1 Quarter) | 3 / 12 (25%) | $86,250 | $87,500 | $90,000 |
| 4 Months | 4 / 12 (33.33%) | $115,000 | $116,667 | $120,000 |
| 6 Months (Half Year) | 6 / 12 (50%) | $172,500 | $175,000 | $180,000 |
| 7 Months | 7 / 12 (58.33%) | $201,250 | $204,167 | $210,000 |
| 8 Months | 8 / 12 (66.67%) | $230,000 | $233,333 | $240,000 |
| 9 Months (3 Quarters) | 9 / 12 (75%) | $258,750 | $262,500 | $270,000 |
[!WARNING] Daily vs. Monthly Proration: If a short plan year does not consist of full calendar months, the proration must be calculated on a daily basis: multiplying the full annual limit by a fraction equal to the actual number of days in the short period divided by 365 (or 366 in a leap year).
Full-Year vs. Partial-Year Participation Rules
One of the most heavily tested, high-error operational concepts in retirement plan administration is the intersection between an individual employee who participates for only part of a plan year and the IRC §401(a)(17) compensation limit.
The Golden Rule: Never Prorate the Cap for an Individual!
Under Treasury Regulation §1.401(a)(17)-1(b)(3)(iii)(B):
The annual compensation limit is NEVER prorated for an individual employee simply because the employee was eligible to participate for only part of a 12-month plan year!
If a plan operates on a full 12-month calendar plan year, and an employee enters the plan on July 1 (participating for only 6 months) or terminates employment on March 31 (participating for only 3 months), the applicable statutory cap is the FULL annual limit (e.g., $360,000 in 2026). The cap is prorated only if the plan year itself is less than 12 months.
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| THE CRITICAL DICHOTOMY: SHORT PLAN YEAR VS. PARTIAL-YEAR PARTICIPANT |
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| |
| SCENARIO A: SHORT PLAN YEAR |
| • Plan Year: July 1, 2026 to December 31, 2026 (6 Months) |
| • The PLAN YEAR itself is less than 12 months. |
| • Result: MANDATORY PRORATION of the cap! |
| • 2026 Cap = $360,000 × (6 / 12) = $180,000. |
| |
| SCENARIO B: PARTIAL-YEAR PARTICIPANT IN A 12-MONTH PLAN YEAR |
| • Plan Year: January 1, 2026 to December 31, 2026 (12 Months) |
| • Employee enters the plan on July 1, 2026 (participates for 6 months). |
| • The PLAN YEAR is a full 12 months. |
| • Result: NO PRORATION of the statutory cap! |
| • Applicable statutory cap for the participant = $360,000! |
| |
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Plan Document Elections: Full-Year vs. Partial-Year Compensation
While the statutory §401(a)(17) limit is not prorated for an individual, the written plan adoption agreement governs how much of the employee's compensation is recognized for allocation purposes:
- Option A: Full-Year Compensation Election: The plan document specifies that allocations are determined based on compensation earned over the entire 12-month plan year, including compensation earned prior to satisfying the eligibility requirements and entering the plan.
- Option B: Partial-Year Compensation Election (Entry Date to End): The plan document specifies that allocations are determined based strictly on compensation earned while an active participant (from the participant's plan entry date to the end of the plan year).
Worked Comparative Case Study: High-Earning Mid-Year Entrant
- Plan Year: January 1, 2026 through December 31, 2026 (Full 12-Month Plan Year; §401(a)(17) limit = $360,000).
- Formula: Discretionary Employer Profit-Sharing Contribution equal to 5% of compensation.
- Participant: Dr. Julian, hired January 1, 2026, enters the plan on July 1, 2026.
- Compensation: Julian earns $40,000 per month:
- Pre-Entry Earnings (Jan 1 to Jun 30): $240,000
- Post-Entry Earnings (Jul 1 to Dec 31): $240,000
- Total 12-Month Earnings: $480,000
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| COMPARATIVE ALLOCATION CALCULATION FOR DR. JULIAN (2026) |
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| |
| METHOD 1: PLAN ELECTS FULL-YEAR COMPENSATION |
| 1. Determine Total Earnings: $240,000 + $240,000 = $480,000. |
| 2. Apply Statutory §401(a)(17) Cap: Lesser of $480,000 or $360,000 = $360,000. |
| 3. Calculate 5% Profit-Sharing Allocation: |
| Allocation = 5% × $360,000 = $18,000. |
| |
| METHOD 2: PLAN ELECTS PARTIAL-YEAR COMPENSATION (FROM ENTRY DATE) |
| 1. Determine Post-Entry Earnings (Jul 1 to Dec 31): $240,000. |
| 2. Apply Statutory §401(a)(17) Cap: |
| The cap is NOT prorated to $180,000! The applicable cap is the full $360,000. |
| Recognized Comp = Lesser of Post-Entry Earnings ($240,000) or Cap ($360,000) = $240,000. |
| 3. Calculate 5% Profit-Sharing Allocation: |
| Allocation = 5% × $240,000 = $12,000. |
| |
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Notice that under Method 2, Julian receives an allocation on the full $240,000 earned after entry because $240,000 is less than the $360,000 annual limit. A common exam trap is to prorate the cap to $180,000 under Method 2, which would incorrectly limit Julian's recognized pay to $180,000 and yield a $9,000 contribution!
Timing of Reaching the Cap: Payroll & Matching Mechanics
When a participant's annualized compensation exceeds the §401(a)(17) limit, the plan administrator and payroll department must manage the timing of when the cap is reached during the plan year.
1. The Payroll Cutoff Method ("Hit the Cap and Stop")
Most automated payroll software systems track year-to-date (YTD) compensation chronologically on a pay-period by pay-period basis. Under the payroll cutoff method:
- Compensation is recognized each pay period until cumulative YTD earnings reach the statutory limit (e.g., $360,000 in 2026).
- Once cumulative earnings hit $360,000, the payroll system automatically sets recognized compensation to $0 for all remaining pay periods in that plan year.
- Impact on 401(k) Deferrals & Matching: If an executive earning $60,000 per month defers 6% of salary, and the employer provides a 100% match up to 6% per pay period:
- By the end of June (Month 6), the executive has earned $360,000 ($60,000 × 6). Cumulative compensation hits the cap.
- For July through December (Months 7 to 12), payroll recognizes $0 in compensation. Therefore, zero elective deferrals are withheld, and zero matching contributions are allocated during the second half of the year!
2. The Matching True-Up Allocation
In plans that calculate matching contributions on a per-payroll-period basis, an executive who hits the §401(a)(17) cap early in the year may be severely shortchanged on employer matching dollars compared to an employee who spreads their deferrals over all 12 months. To rectify this disparity, plan documents frequently include an optional Matching True-Up Provision:
- At the end of the plan year, the administrator recalculates the match based on the employee's total annual deferrals (up to the §402(g) limit) and total annual compensation (up to the §401(a)(17) limit).
- If the annual calculation yields a higher matching figure than the sum of the per-payroll matches actually deposited, the employer makes a year-end "true-up" contribution to fund the difference.
Multiple Employers, Controlled Groups & Family Aggregation Repeal
Single Controlled Group Ceiling: IRC §414(b), (c), and (m)
Under the controlled group and affiliated service group provisions of IRC §414, all corporations, trades, or businesses under common control are treated as a single employer for qualified plan purposes:
- An employee who works for two separate corporate entities that are members of the same parent-subsidiary or brother-sister controlled group does not receive two separate §401(a)(17) limits.
- The employee is subject to a single, aggregated §401(a)(17) limit ($360,000 in 2026) applied across all compensation received from all entities within the controlled group.
Multiple Unrelated Employers
If an individual is concurrently employed by two completely unrelated employers (entities that share no common ownership under IRC §414):
- A separate IRC §401(a)(17) compensation limit applies to each unrelated employer.
- Example: An executive earns $300,000 from Employer A and $200,000 from unrelated Employer B in 2026. Employer A can recognize the full $300,000 under Plan A, and Employer B can recognize the full $200,000 under Plan B, resulting in $500,000 of total recognized compensation across the two independent plans.
The Historic Repeal of Family Aggregation
Prior to 1996, the Internal Revenue Code contained an onerous "family aggregation" rule under former IRC §414(q)(6) and former IRC §401(a)(17). Under that old law, a 5% owner (or one of the top 10 most highly compensated employees) and their spouse and lineal descendants under age 19 were treated as a single employee, sharing a single §401(a)(17) limit.
[!IMPORTANT] Family Aggregation Repealed! Under the Small Business Job Protection Act of 1996 (SBJPA), Congress repealed the family aggregation rules effective for plan years beginning after December 31, 1996. On modern ASPPA QKA exams, spouses, parents, and children employed by the same family business each have their own separate, full IRC §401(a)(17) annual compensation limit ($360,000 each in 2026). Any exam answer choice that aggregates family members under a single compensation cap is an obsolete historical distractor!
Common ASPPA QKA Exam Traps
- Exam Trap 1: Prorating the Cap for a Mid-Year Entrant: The single most common math error on ASPPA exams is prorating the §401(a)(17) cap for an employee who enters on July 1 in a 12-month calendar plan year (e.g., capping them at $180,000 instead of $360,000). Remember: never prorate for an individual participant; prorate only when the plan year itself is short.
- Exam Trap 2: Falling for the Family Aggregation Distractor: Exam questions love to describe a family-owned corporation where the husband earns $300,000 and the wife earns $200,000, and ask for their combined recognized compensation. Family aggregation was repealed in 1996! Husband gets $300,000; wife gets $200,000. Both are under the $360,000 cap; combined recognized comp is $500,000.
- Exam Trap 3: Confusing §401(a)(17) with §415(c) Annual Additions: Candidates frequently conflate the compensation cap ($360,000 in 2026) with the annual additions limit ($72,000 in 2026). §401(a)(17) is the maximum compensation base; §415(c) is the maximum dollar contribution that can be added to an account.
- Exam Trap 4: Short Limitation Year vs. Short Plan Year: In rare cases, a plan may have a 12-month plan year but a short limitation year (or vice versa). The §401(a)(17) cap is prorated based on the period for which compensation is determined under the plan terms.
- Exam Trap 5: Controlled Group Double-Dipping: If an executive works for Subsidiary X and Subsidiary Y within a controlled group, candidates often apply the $360,000 cap separately to each company. In a controlled group, all entities share a single aggregate cap.
An employer establishes a new calendar-year 401(k) profit-sharing plan with an initial effective date of June 1, 2026, resulting in a 7-month short plan year ending December 31, 2026. The statutory annual compensation limit under IRC §401(a)(17) for the 2026 calendar year is $360,000. An executive earns $35,000 per month ($245,000 during the 7-month short plan year). Under Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(A), what is the maximum compensation that can be recognized for this executive for allocation purposes in the short plan year?
A profit-sharing plan operates on a full 12-month calendar plan year (January 1 through December 31, 2026). The written plan document specifies that allocations are based on 'compensation earned while an active participant.' An employee meets the plan's statutory age and service requirements and enters the plan on July 1, 2026. The employee earns $20,000 per month ($120,000 from January 1 to June 30, and $120,000 from July 1 to December 31, totaling $240,000 for the year). Under Treas. Reg. §1.401(a)(17)-1(b)(3)(iii)(B), what is the participant's recognized compensation for profit-sharing allocations for the 2026 plan year?
Corporation Alpha owns 100% of Corporation Beta. Both entities sponsor separate 401(k) profit-sharing plans for their respective employees. In 2026, an executive performs services for both companies, receiving $250,000 in compensation from Corporation Alpha and $200,000 in compensation from Corporation Beta (total compensation = $450,000). The statutory §401(a)(17) limit for 2026 is $360,000. How is the statutory compensation limit applied to this executive?