12.3 Form 5329 Excise Taxes, SECURE 2.0 Penalty Reductions (25%/10%), and Form 8606 Basis Tracking

Statutory Mandate & Structural Architecture of Form 5329

While IRA custodians report contribution and distribution transactions on Forms 5498 and 1099-R, the legal duty of calculating, reconciling, and paying statutory excise taxes falls upon the account owner. This taxpayer compliance obligation is governed by IRS Form 5329 (Additional Taxes on Qualified Plans [Including IRAs] and Other Tax-Favored Accounts).

Form 5329 is an individual tax return filed under the authority of Internal Revenue Code Sections 72(t), 4973, and 4974. Although typically attached to the taxpayer's annual Form 1040, Form 5329 is legally a standalone tax return. If an individual is not required to file a federal income tax return (e.g., their gross income falls below the standard deduction threshold), but is liable for an early distribution penalty, an excess contribution excise tax, or an RMD shortfall, the taxpayer MUST file Form 5329 independently with the IRS, complete with their signature under penalties of perjury and check payment.

Part I: 10% Additional Tax on Early Distributions (IRC § 72(t))

Part I of Form 5329 calculates the 10% additional tax on early distributions from qualified retirement plans and IRAs under IRC § 72(t). When an IRA owner under age 59 1/2 receives a Form 1099-R with Code 1 in Box 7, the entire gross distribution is reported on Line 1 of Form 5329.

Claiming Statutory Penalty Exceptions on Line 2

If the distribution qualifies for a statutory exception under IRC § 72(t)(2), the taxpayer claims relief on Line 2 by entering the corresponding two-digit IRS exception number and the exempt dollar amount: The 2025 Form 5329 instructions number the exceptions 01–23 (and 99 if more than one applies). The numbers most relevant to IRAs are:

• 02: Substantially Equal Periodic Payments (SEPP) under IRC § 72(t)(2)(A)(iv), computed under Notice 2022-6;
• 03: Total and permanent disability under IRC § 72(m)(7);
• 04: Death of the account owner (IRC § 72(t)(2)(A)(ii));
• 05: Unreimbursed medical expenses exceeding 7.5% of Adjusted Gross Income (IRC § 72(t)(2)(B));
• 07: Health insurance premiums paid by certain unemployed individuals (IRC § 72(t)(2)(D));
• 08: Qualified higher education expenses for the taxpayer, spouse, child, or grandchild (IRC § 72(t)(2)(E));
• 09: Qualified first-time homebuyer distributions, up to a lifetime maximum of $10,000 (IRC § 72(t)(2)(F));
• 10: Distributions made because of an IRS levy (IRC § 72(t)(2)(A)(vii));
• 11: Qualified reservist distributions for active duty of at least 180 days (IRC § 72(t)(2)(G));
• 12: Distributions incorrectly coded as early (code 1, J, or S) although the owner was 59½ or older;
• 19: Qualified Birth or Adoption Distributions (QBAD) up to $5,000 per child (IRC § 72(t)(2)(H));
• 20: Distributions to terminally ill individuals certified by a physician (IRC § 72(t)(2)(L));
• 21: Corrective distributions of the income on excess contributions made by the return due date (SECURE 2.0 § 333);
• 22: Distributions to victims of domestic abuse, up to the lesser of an indexed $10,000 ($10,500 for 2026) or 50% of the account (IRC § 72(t)(2)(K));
• 23: Emergency personal expense distributions up to $1,000 per calendar year (IRC § 72(t)(2)(I)).

Qualified disaster recovery distributions are reported on Form 8915-F rather than claimed on line 2.

Any distribution amount remaining on Line 3 after deducting qualifying exceptions is multiplied by 10% (or 25% for SIMPLE IRA distributions carrying Code S) on Line 4 and transferred to Form 1040, Schedule 2.

Parts III & IV: The 6% Annual Excise Tax on Excess Contributions (IRC § 4973)

Under Internal Revenue Code Section 4973, an individual who deposits contributions exceeding statutory limits into a Traditional IRA (reported on Form 5329 Part III) or a Roth IRA (reported on Form 5329 Part IV) is subject to an annual 6% excise tax on the excess amount.

Mechanics and Cumulative Nature of the 6% Excise Tax

The 6% excise tax is assessed on the lesser of the excess contribution amount or the fair market value of the IRA as of December 31. Crucially for CISP candidates, the 6% excise tax is cumulative: it is assessed every single year that the excess remains in the account as of December 31 until it is formally corrected.

Correction Methods to Extinguish the 6% Tax

1. Pre-Deadline Corrective Distribution (IRC § 408(d)(4)): If the taxpayer withdraws the excess contribution along with the Net Income Attributable (NIA) on or before the due date of their federal income tax return (including the automatic 6-month extension to October 15 under Treasury Regulation § 301.9100-2), no 6% excise tax is owed under IRC § 4973. The returned NIA is taxable as ordinary income for the year in which the excess contribution was made, and exception 21 on Form 5329 confirms it is not subject to the 10% additional tax.
2. Post-Deadline Removal (IRC § 408(d)(5)): If the deadline passes, the taxpayer must distribute the excess principal (without earnings). The 6% excise tax is owed for each tax year the excess remained in the account on December 31, but the tax ceases for subsequent years once distributed.
3. Absorption in Subsequent Tax Years: The taxpayer may absorb the excess by under-contributing in a subsequent calendar year, applying the unused contribution headroom under IRC § 219 against the prior excess.

Part IX: The RMD Shortfall Excise Tax Transformation (SECURE 2.0 Section 302)

Under Internal Revenue Code Section 4974, if an account owner or beneficiary fails to distribute the full Required Minimum Distribution (RMD) from an IRA, 401(k), 403(b), or 457(b) plan during the calendar year, an excise tax is imposed on the shortfall (the difference between the RMD amount required and the amount actually distributed).

Historical Penalty vs. SECURE 2.0 Landmark Relief

• Historical Rule (Pre-2023): Under former IRC § 4974(a), the excise tax was a draconian 50% of the shortfall amount. For an individual who missed a $20,000 RMD, the mandatory federal excise tax was $10,000.
• SECURE 2.0 Section 302 Reform (Effective Tax Year 2023 Onward): Section 302 of the SECURE 2.0 Act permanently slashed the statutory excise tax rate from 50% down to 25%.

The Statutory Correction Window and the 10% Penalty Tier (IRC § 4974(e))

In addition to reducing the baseline rate to 25%, SECURE 2.0 created an innovative lower-tier penalty under new IRC § 4974(e):

• The excise tax rate is further reduced from 25% down to 10% if the taxpayer corrects the shortfall during the statutory Correction Window.
• Definition of the Correction Window: The statutory correction window begins on the date the excise tax is imposed and ends on the earliest of:
  1. The date a notice of deficiency under IRC § 6212 is mailed to the taxpayer with respect to the tax;
  2. The date on which the excise tax is assessed by the IRS; or
  3. The last day of the second taxable year beginning after the end of the taxable year in which the tax is imposed.
• Operational Timeline Example: An IRA owner fails to take a $10,000 RMD for calendar year 2023, so the tax is imposed for taxable year 2023. The second taxable year that begins after the end of 2023 is 2025, so the correction window closes on December 31, 2025 (earlier if the IRS mails a deficiency notice or assesses the tax). If the taxpayer takes the $10,000 corrective distribution and files Form 5329 within that window, the excise tax liability is capped at 10% ($1,000) instead of 25% ($2,500).

Requesting a Reasonable Cause Waiver under IRC § 4974(d)

Taxpayers who miss an RMD are not obligated to pay the 25% or 10% excise tax if they qualify for an administrative waiver under IRC § 4974(d). The statute authorizes the IRS to grant a 100% waiver of the excise tax if the taxpayer demonstrates that:

1. The shortfall was due to reasonable error (e.g., severe illness, hospitalization, incorrect calculation provided by a financial institution, or death in the immediate family); AND
2. The taxpayer has taken, or is taking, reasonable steps to remedy the shortfall (i.e., taking the full corrective distribution immediately upon discovering the oversight).

Step-by-Step Waiver Procedure on Form 5329 Part IX

To claim a waiver under IRC § 4974(d), the taxpayer must adhere to a specific filing protocol on Form 5329 Part IX:

1. Execute Corrective Distribution: The account owner must immediately disburse the missed RMD amount from the IRA.
2. Complete Part IX Lines:
   • Lines 52a and 53a: The RMD and the amount actually distributed for plans whose full shortfall was distributed during the correction window (taxed at 10% on line 54a).
   • Lines 52b and 53b: The RMD and the amount distributed for all other plans (taxed at 25% on line 54b).
3. Write 'RC' on the Form: On the dotted line next to line 54a and/or 54b, the taxpayer writes RC (for reasonable cause) and the shortfall to be waived in parentheses, for example RC ($15,000). The waived amount is subtracted, and the result is entered on line 54a or 54b.
4. Complete Line 55: Line 55 totals lines 54a and 54b. If the entire shortfall is waived, the tax is $0; any tax shown must be paid while the IRS reviews the request.
5. Attach Statement of Explanation: The taxpayer must attach a formal written letter explaining the facts constituting reasonable cause, stating the exact date the corrective distribution was completed, and providing documentation (such as bank transaction confirmation statements).

Form 8606: Tracking Nondeductible Contributions & Basis (IRC § 408(o))

Under Internal Revenue Code Section 408(o), any taxpayer who makes a nondeductible contribution to a Traditional IRA must report the contribution to the IRS on Form 8606 (Nondeductible IRAs). Form 8606 tracks after-tax basis across the taxpayer's lifetime, ensuring that basis is recovered tax-free upon distribution or conversion.

Structural Overview of Form 8606

• Part I (Traditional IRAs): Tracks current-year nondeductible contributions, calculates total cumulative basis, and computes the nontaxable portion of distributions and conversions using the aggregate pro-rata rule.
• Part II (Conversions from Traditional, SEP, or SIMPLE IRAs to Roth IRAs): Applies the basis recovery percentage from Part I to Roth conversions, determining the taxable conversion amount subject to ordinary income tax.
• Part III (Distributions from Roth IRAs): Governs nonqualified distributions from Roth IRAs, applying the statutory ordering rules under IRC § 408A(d)(4).

The Aggregate Pro-Rata Formula under IRC § 408(d)(2)

A core concept on the CISP examination is the mandatory calculation of tax-free basis recovery under IRC § 408(d)(2). An IRA owner cannot selectively designate a distribution as coming solely from after-tax basis; every distribution and conversion contains a proportionate blend of basis and pre-tax assets.

Nontaxable Percentage = Total IRA Basis (Prior Year Basis + Current Nondeductible Deposits) / [Total Dec 31 FMV of ALL Traditional/SEP/SIMPLE IRAs + Current Distributions + Current Conversions]

Application Mechanics

• Aggregation Rule: The denominator must include the December 31 fair market value of ALL Traditional IRAs, SEP IRAs, and SIMPLE IRAs owned by the individual, including those at different banks.
• Nontaxable Amount: Multiply the Nontaxable Percentage by the current year's distributions.
• Remaining Basis: Subtract the nontaxable amount from Total Basis to establish the taxpayer's ending basis, which carries forward to Line 2 of next year's Form 8606.

Form 8606 Parts II & III: Conversions and Roth Distribution Ordering

Part II: Conversions to Roth IRAs

When a taxpayer executes a conversion to a Roth IRA, Form 8606 Part II draws from the Part I pro-rata calculation. Basis is allocated proportionately between distributions and conversions. Only the pre-tax portion of the conversion is added to the taxpayer's taxable income on Form 1040.

Part III: Roth IRA Nonqualified Distribution Ordering Rules

Under IRC § 408A(d)(4) and Treasury Regulation § 1.408A-6, nonqualified distributions from Roth IRAs (reported with Code J in Box 7 of Form 1099-R) are statutorily ordered as follows on Form 8606 Part III:

1. Tier 1 (Regular Annual Contributions): Distributed first. Always 100% tax-free and penalty-free, regardless of the owner's age or holding period.
2. Tier 2 (Conversions and Rollovers): Distributed second, on a First-In, First-Out (FIFO) basis. Within each conversion year, taxable conversion amounts are distributed before nontaxable conversion amounts. Taxable conversion amounts distributed within five years of the conversion by an individual under age 59 1/2 are subject to a 10% early withdrawal recapture penalty under IRC § 72(t).
3. Tier 3 (Earnings): Distributed last. Taxable as ordinary income and subject to the 10% premature distribution penalty unless a statutory exception applies.

Penalties for Form 8606 Non-Compliance under IRC § 6693(b)

Congress enacted specific civil penalties under IRC § 6693(b) to enforce compliance with Form 8606 basis tracking:

• Failure to File Form 8606 (IRC § 6693(b)(2)): A taxpayer who is required to file Form 8606 for any tax year (e.g., made a nondeductible contribution) and fails to do so must pay a penalty of $50 for each failure, unless reasonable cause is proven.
• Overstatement of Nondeductible Contributions (IRC § 6693(b)(1)): If an individual overstates the amount of designated nondeductible contributions made for any taxable year on Form 8606 without reasonable cause, the individual is liable for a penalty of $100 for each overstatement.

Comprehensive Comparison Table: Penalties, Excise Taxes & Reporting Forms

Bank Administrative Scenario: Missed RMD Remediation & Form 5329/8606 Execution

Client Harold (age 77) maintains a Traditional IRA with Pinnacle Wealth Management holding $450,000 in assets. Harold made $30,000 in nondeductible contributions during the late 1990s, properly tracked on Form 8606. Harold's calculated Required Minimum Distribution for calendar year 2024 was $18,000.

In early November 2024, Harold suffered a severe stroke and was hospitalized through January 2025. As a result, Harold failed to take his $18,000 RMD by the December 31, 2024 deadline. In February 2025, Harold's daughter and legal attorney-in-fact, Karen, reviews the account statements, identifies the missed distribution, and contacts Pinnacle's CISP trust operations manager.

The CISP manager guides Karen and Harold's CPA through the statutory remediation steps:

1. Immediate Corrective Distribution: On February 15, 2025, the bank disburses an $18,000 corrective distribution to Harold. The bank notes that because the distribution occurs in calendar year 2025, it will be reported on Harold's 2025 Form 1099-R (issued in January 2026), coded as Code 7. It cannot be reported on a 2024 Form 1099-R.
2. Form 5329 Reasonable Cause Waiver Request: The CPA prepares Form 5329 for Harold's 2024 tax return:
   • In Part IX, report the $18,000 RMD and the $0 distributed in 2024 on the lines for plans whose shortfall was fully distributed during the correction window (lines 52a and 53a on the current form);
   • Next to line 54a, write RC and ($18,000), subtract the waived amount, and enter $0;
   • Line 55 therefore shows $0 tax;
   • Attach a letter explaining Harold's sudden incapacitating stroke, hospital admission records, and transaction confirmation proving the full $18,000 corrective distribution was completed on February 15, 2025.
3. Evaluation of SECURE 2.0 Fallback Rates: The manager explains that if the IRS were to deny the reasonable cause waiver, SECURE 2.0 Section 302 protects Harold from the former 50% penalty ($9,000). Because Harold took the corrective distribution during the statutory correction window (which, for a 2024 RMD, runs through December 31, 2026), his maximum liability would be capped at the reduced 10% rate ($1,800), rather than the 25% standard rate ($4,500).
4. Form 8606 Basis Protection: The manager alerts the CPA to ensure that when Harold files his 2025 Form 1040, Form 8606 Part I must be completed. Under the pro-rata formula, a portion of Harold's cumulative $30,000 nondeductible basis will be allocated to the $18,000 distribution, ensuring that Harold recovers after-tax funds tax-free and maintains accurate basis ledgers without triggering the $50 failure penalty under IRC § 6693(b)(2).