2.2 Active Participant Status and Deductibility MAGI Phaseout Ranges

Statutory Framework: Active Participation and Deductibility (IRC § 219(g))

Under federal tax law, an individual's legal eligibility to contribute to a Traditional IRA is distinct from their ability to deduct that contribution on Form 1040. While any individual with eligible taxable compensation may contribute up to the annual statutory limit, the deductibility of that contribution is regulated by IRC Section 219(g).

Under IRC Section 219(g), deductibility is phased out only if two distinct conditions exist simultaneously:

1. The taxpayer (or their spouse, if married filing jointly) is an active participant in an employer-sponsored retirement plan for any part of the plan year ending with or within the taxpayer's taxable year; and
2. The taxpayer's Modified Adjusted Gross Income (MAGI) exceeds specific statutory phaseout thresholds.

If neither the taxpayer nor their spouse is an active participant in an employer plan, the Traditional IRA contribution is 100% fully deductible, regardless of how high their income or MAGI may be. A corporate executive earning $2,000,000 who is not covered by any employer retirement plan can deduct their entire Traditional IRA contribution (up to $7,500 for 2026).

---

Active Participant Definition and Plan Types (IRC § 219(g)(5))

IRC Section 219(g)(5) and Treasury Regulation § 1.219-2 establish precise legal criteria for determining whether an individual is an active participant. Active participation is formally communicated to the employee on IRS Form W-2, Box 13, where the employer marks the "Retirement plan" checkbox.

Statutorily Covered Employer Plans

Under Section 219(g)(5), an employer-sponsored retirement plan includes:

• Qualified pension, profit-sharing, or stock bonus plans under IRC Section 401(a) (including traditional 401(k) and Roth 401(k) plans).
• Qualified annuity plans under IRC Section 403(a).
• Tax-sheltered annuity arrangements under IRC Section 403(b).
• Simplified Employee Pension (SEP) plans under IRC Section 408(k).
• Savings Incentive Match Plan for Employees (SIMPLE) IRA plans under IRC Section 408(p).
• Qualified governmental plans established by the United States, a state, or a political subdivision (e.g., FERS, state employee retirement systems).

Critical Statutory Exception: Governmental Section 457(b) Plans

A critical technical point frequently tested on the CISP examination is that non-qualified deferred compensation plans under IRC Section 457(b) maintained by state or local governments or tax-exempt entities are not listed under IRC Section 219(g)(5)(A)(iii). Therefore, participation in a governmental Section 457(b) plan does not trigger active participant status. An employee whose only retirement plan is a governmental 457(b) plan is legally treated as a non-active participant for Traditional IRA deduction purposes.

Plan-Specific Participation Testing Rules

The statutory test for active participation varies depending on the legal structure of the employer's plan:

1. Defined Benefit Pension Plans: Under Treasury Regulation § 1.219-2(b), an employee is an active participant if they are eligible to participate under the plan's structural provisions for any portion of the plan year ending with or within the employee's tax year. This applies even if the employee chose not to accrue benefits, failed to make mandatory employee contributions, or had zero vested rights in accrued benefits.
2. Defined Contribution Plans (401(k), 403(b), Profit-Sharing): Under Treasury Regulation § 1.219-2(d), an individual is an active participant only if contributions or forfeitures are allocated to the individual's account during the plan year. This includes:
   • Elective salary deferrals made by the employee (pre-tax or Roth 401(k));
   • Employer matching contributions;
   • Employer nonelective or profit-sharing contributions; or
   • Reallocated plan forfeitures. Operational Rule: An employee who is eligible to participate in a 401(k) plan but elects zero salary reduction, receives no employer contributions, and receives no forfeitures during the plan year is not an active participant for that year, and Box 13 on Form W-2 should not be checked.
3. SEP and SIMPLE IRA Plans: These are treated like defined contribution plans. Under Pub. 590-A, an individual is covered for a tax year if amounts are contributed or allocated to their account for the plan year that ends with or within that tax year (for example, any employer SEP contribution or SIMPLE salary reduction made for that year).

---

Active Participant vs. Non-Active Spouse Rules (IRC § 219(g)(7))

Prior to 1998, under the historic "spousal taint" doctrine, if one spouse was an active participant in an employer plan, both spouses were treated as active participants and subjected to the lower phaseout limits, severely penalizing non-working spouses.

The Taxpayer Relief Act of 1997 added IRC Section 219(g)(7), creating a separate, significantly higher phaseout threshold for a non-active spouse married to an active participant. When married taxpayers file a joint return (MFJ):

• The active participant spouse is evaluated under the active participant MFJ phaseout range ($126,000–$146,000 for 2025; $129,000–$149,000 for 2026).
• The non-active spouse is evaluated under the much higher spousal phaseout range ($236,000–$246,000 for 2025; $242,000–$252,000 for 2026).

If the couple's joint MAGI is $180,000 in 2025, the active spouse cannot deduct any portion of their $7,000 IRA contribution. However, the non-active spouse can deduct 100% of their $7,000 contribution because their joint MAGI is below the $236,000 spousal threshold.

---

Calculating Modified Adjusted Gross Income (MAGI)

For IRA deductibility purposes, Modified Adjusted Gross Income (MAGI) is calculated pursuant to IRC Section 219(g)(3)(A). The calculation begins with Adjusted Gross Income (AGI) from Form 1040, Line 11, and requires adding back specific statutory deductions and exclusions:

**MAGI Formula**: MAGI = AGI + Statutory Add-Backs

Mandatory Add-Back Items:

1. The deduction for Traditional IRA contributions under IRC Section 219;
2. The student loan interest deduction under IRC Section 221;
3. The foreign earned income exclusion and foreign housing exclusion under IRC Section 911;
4. The foreign housing deduction under IRC Section 911;
5. The exclusion of interest from qualified U.S. savings bonds used for higher education under IRC Section 135 (Form 8815); and
6. The exclusion of employer-provided adoption assistance benefits under IRC Section 137 (Form 8839).

Other above-the-line deductions—such as educator expenses, health savings account (HSA) contributions, and self-employed health insurance deductions—remain subtracted from income and are not added back when computing MAGI for IRA deductibility.

---

Comprehensive Phaseout Ranges: 2025 and 2026

The IRS indexes IRA deductibility phaseout thresholds annually for inflation under IRC Section 219(g)(8). The phaseout ranges for tax years 2025 and 2026 (IRS Notice 2025-67) are presented below:

Key Exam Observation: Married individuals who live together at any time during the taxable year but file separate tax returns (MFS) face a severe statutory penalty: their phaseout begins at $0 of MAGI and completely phases out at $10,000. If their MAGI exceeds $10,000, zero deduction is permitted. However, if married spouses live apart for the entire 365 days of the taxable year and file MFS, IRC Section 219(g)(4) allows them to use the Single active participant phaseout limits.

---

Mathematical Deduction Formula and Statutory Rounding Rules

When a taxpayer's MAGI falls within the statutory phaseout range, the allowable deduction is calculated using the proportionate phaseout formula prescribed by IRC Section 219(g)(2):

• Phaseout Ratio = (MAGI - Phaseout Lower Limit) / Phaseout Range Width
• Reduction Amount = Maximum Allowable Contribution × Phaseout Ratio
• Tentative Deductible Limit = Maximum Allowable Contribution - Reduction Amount

The Two Mandatory Statutory Adjustments

1. Rounding Up to the Next Multiple of $10 (IRC § 219(g)(2)(C)): If the tentative deductible limit is not an exact multiple of $10, federal law mandates that it must be rounded UP to the next higher multiple of $10. For example, if the calculation yields $4,131.25, the deductible limit is rounded up to $4,140.
2. The $200 Minimum Deduction Floor (IRC § 219(g)(2)(B)): If the mathematical formula results in an allowable deduction that is greater than $0 but less than $200, the allowable deduction is automatically fixed at $200. However, if MAGI equals or exceeds the absolute top of the phaseout bracket, the deduction is strictly $0. The $200 floor applies only while MAGI is strictly inside the phaseout window.

Step-by-Step Calculation Walkthrough

Scenario: Brian, age 42, is a single active participant in a 401(k) plan. For tax year 2025, his MAGI is $84,350. He contributes the $7,000 statutory maximum to his Traditional IRA.

1. Identify Phaseout Bracket: Single active participant for 2025 is $79,000 to $89,000 (width = $10,000).
2. Calculate Excess MAGI: $84,350 - $79,000 = $5,350.
3. Compute Phaseout Fraction: $5,350 / $10,000 = 0.535.
4. Compute Reduction: $7,000 × 0.535 = $3,745.
5. Compute Tentative Deduction: $7,000 - $3,745 = $3,255.
6. Apply $10 Rounding Rule: $3,255 is not a multiple of $10; rounding up to the next higher multiple of $10 produces $3,260.
7. Result: Brian deducts $3,260 on Schedule 1 (Form 1040). The remaining $3,740 ($7,000 - $3,260) represents a designated nondeductible contribution reported on Form 8606.

---

Nondeductible Contributions, Basis Tracking, and Form 8606 Compliance

Under IRC Section 408(o), taxpayers whose deductions are partially or fully phased out are legally permitted to make nondeductible Traditional IRA contributions up to the full annual contribution limit ($7,500, or $8,600 if age 50+, for 2026).

Mandatory Filing of IRS Form 8606

Any individual who makes a nondeductible contribution to a Traditional IRA must file IRS Form 8606 (Nondeductible IRAs) with their Form 1040 individual income tax return. Form 8606 accomplishes three vital tax functions:

1. It formally notifies the IRS of the nondeductible character of the contribution under IRC Section 408(o)(2).
2. It establishes and tracks cumulative cost basis (after-tax money) in the taxpayer's Traditional IRAs.
3. It calculates the non-taxable pro-rata recovery percentage when distributions or conversions occur in future years.

Statutory Penalties for Form 8606 Non-Compliance

IRC Section 6693 imposes specific civil monetary penalties regarding Form 8606:

• Failure to File Penalty (IRC § 6693(b)(2)): A taxpayer who fails to file Form 8606 when making a nondeductible contribution is subject to a $50 penalty for each failure, unless reasonable cause is proven.
• Overstatement of Basis Penalty (IRC § 6693(b)(1)): An individual who overstates the amount of designated nondeductible contributions on Form 8606 is subject to a $100 penalty, unless the overstatement is due to reasonable cause.

---

Other Tax Issues: The Saver's Credit

Deductibility is not the only tax benefit tied to an IRA contribution. Under IRC § 25B, the Retirement Savings Contributions Credit (Saver's Credit) gives eligible low- and moderate-income savers a nonrefundable credit of 50%, 20%, or 10% of up to $2,000 of contributions per person to traditional or Roth IRAs and employer plans. The saver must be at least 18, not a full-time student, and not claimed as someone else's dependent, and contributions are reduced by certain recent distributions.

Source: IRS Notice 2025-67. A traditional IRA contribution can therefore produce both a deduction and a credit, while a Roth contribution can still earn the credit. Beginning with tax years after 2026, SECURE 2.0 § 103 replaces the credit with the Saver's Match, a federal matching contribution deposited directly into the saver's IRA or plan, so custodians should expect to receive these deposits in the future.

Realistic Bank Custodial Advisory Scenario: Tax Reporting vs. Account Administration

A common compliance issue handled by bank IRA administrators involves customer confusion regarding Form 5498 and deductibility:

Case: Danielle, a senior vice president at a regional hospital, participates in a 403(b) plan and earned $165,000 in 2025. She files as Single and contributes $7,000 to her Traditional IRA at Riverview Community Bank. In May 2026, Danielle receives her IRS Form 5498 from the bank. Box 1 displays "Traditional IRA contributions: $7,000." Danielle contacts the bank's trust operations supervisor, demanding an amended Form 5498 showing "$0 deductible / $7,000 nondeductible," expressing concern that the IRS will audit her for claiming an improper deduction.

The Bank Administrator's Statutory Response: The trust operations supervisor correctly explains that under the Form 5498 instructions, IRA trustees and custodians are not required to report whether a contribution is deductible, and the participant is not required to tell them. Custodians have no legal knowledge of an individual's total gross income, spousal participation status, or tax return filing choices. Form 5498 reports gross regular contributions deposited into the account.

Deductibility is determined exclusively by the taxpayer when preparing Form 1040. Because Danielle's MAGI of $165,000 exceeds the 2025 Single active participant phaseout ceiling of $89,000, she must claim $0 deduction on Form 1040 Schedule 1 and must file Form 8606 to report the $7,000 as nondeductible basis. The bank's Form 5498 is completely accurate as issued.