Tax Shelter Disclosure Rules: Reportable and Listed Transactions for HNW Taxpayers

The Five Categories of Reportable Transactions

Under Treasury Regulation §1.6011-4, a transaction is reportable if it falls into any of the following categories.

Listed transactions

A listed transaction is the same as, or substantially similar to, a type of transaction the IRS has determined to be a tax avoidance transaction and identified as a listed transaction in a notice, regulation, or other published guidance.

Confidential transactions

A confidential transaction is offered under conditions of confidentiality and involves a minimum advisor fee: $250,000 if the taxpayer is a corporation (or a partnership or trust whose owners are all corporations) and $50,000 in other cases.

Transactions with contractual protection

These are transactions in which the taxpayer or a related party has the right to a full or partial refund of fees if the intended tax consequences are not sustained, or in which fees are contingent on realizing the tax benefits.

Loss transactions

A loss transaction generates a loss under IRC §165 at or above specified thresholds. For a corporation, or a partnership whose partners are all corporations, the threshold is $10 million in a single year or $20 million in any combination of years. For individuals, S corporations, trusts, and other partnerships, it is $2 million in a single year or $4 million in any combination of years. Individuals and trusts also report foreign currency losses under IRC §988 of $50,000 or more in a single year. IRS guidance excludes certain types of losses from this category.

Transactions of interest

A transaction of interest is the same as, or substantially similar to, a type of transaction the IRS has identified as a transaction of interest in published guidance. The IRS uses this category for transactions it views as having potential for tax avoidance but about which it wants more information.

Examples of Listed Transactions

The IRS publishes a list of listed transactions on its website. Examples include:

• Inflated partnership basis transactions, often called “Son of BOSS,” identified in Notice 2000-44.
• Syndicated conservation easement transactions in which promotional materials suggest a charitable deduction of at least 2.5 times the investment. In Green Valley Investors, LLC v. Commissioner, 159 T.C. No. 5 (2022), the Tax Court held that the IRS’s earlier identification of these transactions in Notice 2017-10 was issued without the notice-and-comment procedures required by the Administrative Procedure Act and set the notice aside. The IRS then issued final regulations, Treasury Regulation §1.6011-9, published October 8, 2024.
• Certain micro-captive insurance transactions. Final regulations published January 14, 2025 (Treasury Regulations §§1.6011-10 and 1.6011-11) identify some micro-captive arrangements as listed transactions and others as transactions of interest, using objective factors such as loss ratios and financing arrangements.

How Disclosure Works

Form 8886, Reportable Transaction Disclosure Statement, is attached to the tax return for each taxable year in which the taxpayer participates in a reportable transaction. When a transaction is disclosed for the first time, a copy must also be sent to the IRS Office of Tax Shelter Analysis (OTSA).

If a transaction becomes a listed transaction or a transaction of interest after the taxpayer has filed a return reflecting participation, and the assessment period for that year is still open, a disclosure statement generally must be filed with OTSA within 90 calendar days after the transaction is identified.

When a partnership or S corporation participates in a reportable transaction, both the entity and its owners may have disclosure obligations. A taxpayer who is unsure whether a transaction is reportable may file a protective disclosure under the regulations. Material advisors have separate obligations under IRC §§6111 and 6112, including filing Form 8918 and maintaining lists of the persons they advised.

Penalties for Failing to Disclose

IRC §6707A

The penalty for failing to include required information about a reportable transaction is 75% of the decrease in tax shown on the return as a result of the transaction (or that would have resulted if the transaction were respected). The minimum penalty is $5,000 for an individual and $10,000 for other taxpayers. The maximum is $10,000 for an individual and $50,000 for other taxpayers, increased to $100,000 and $200,000 for listed transactions. The IRS may rescind the penalty in limited circumstances, but not for a listed transaction.

IRC §6662A

A 20% accuracy-related penalty applies to a reportable transaction understatement attributable to a listed transaction or to another reportable transaction with a significant purpose of tax avoidance or evasion. The rate increases to 30% if the transaction was not adequately disclosed.

Extended assessment period

Under IRC §6501(c)(10), if a taxpayer fails to disclose a listed transaction as required, the time to assess tax with respect to that transaction does not expire until one year after the earlier of the date the IRS receives the required information or the date a material advisor provides the required list information in response to an IRS request.

The Bottom Line

Taxpayers who hold complex investments or have been offered a tax-motivated arrangement should confirm whether Form 8886 is required for each year of participation. If a required disclosure was missed, the timing and method of correcting it deserve careful review.