Congress has enacted a series of income tax laws designed to halt the growth of abusive tax avoidance transactions. These provisions include the disclosure of reportable transactions. Each taxpayer that has participated in a reportable transaction and that is required to file a tax return must disclose information for each reportable transaction in which the taxpayer participates. Use Form 8886 to disclose information for each reportable transaction in which participation has occurred. Generally, Form 8886 must be attached to the tax return for each tax year in which participation in a reportable transaction has occurred. If a transaction is identified as a listed transaction or transaction of interest after the filing of a tax return (including amended returns), the transaction must be disclosed either within 90 days of the transaction being identified as a listed transaction or a transaction of interest or with the next filed return, depending on which version of the regulations is applicable. See the regulations under section 1.6011-4 for more information. Material advisors with respect to any reportable transaction must also disclose information about the transaction on Form 8918. This requirement applies to material advisors who provide material aid, assistance, or advice on any reportable transaction after October 22, 2004. One reportable transaction that must be disclosed is a loss transaction. Losses that must be reported on Forms 8886 and 8918 If a taxpayer claims a loss under § 165 of at least one of the following amounts on a tax return, then the taxpayer has participated in a loss transaction and must file Form 8886. If an advisor provides material aid, assistance, or advice on a transaction that results in a taxpayer claiming a § 165 loss of at least one of the following amounts and meets other filing requirements; then the advisor is a material advisor and must file Form 8918. For individuals, at least $2 million in a single tax year or $4 million in any combination of tax years. For corporations (excluding S corporations), at least $10 million in any single tax year or $20 million in any combination of tax years. For partnerships with only corporations (excluding S corporations) as partners (looking through any partners that are also partnerships), at least $10 million in any single tax year or $20 million in any combination of tax years, whether or not any losses flow through to one or more partners. For all other partnerships and S corporations, at least $2 million in any single tax year or $4 million in any combination of tax years, whether or not any losses flow through to one or more partners or shareholders. For trusts, at least $2 million in any single tax year or $4 million in any combination of tax years, whether of not any losses flow through to one or more beneficiaries. A loss from a foreign currency transaction under Internal Revenue Code section 988 is a loss transaction if the gross amount of the loss is at least $50,000 in a single tax year for individuals or trusts, whether or not the loss flows through from an S corporation or partnership. Taxpayers whose filed return does not reflect a section 165 loss that equals or exceeds the applicable threshold amount have not participated in a loss transaction. If you are a partner, shareholder, or beneficiary of a pass-through entity, you have participated in a loss transaction if your tax return reflects a section 165 loss allocable to it from the pass-through entity that equals or exceeds the applicable threshold amount. Losses that do not have to be reported on Forms 8886 and 8918: Losses from casualties, thefts, and condemnations Losses from Ponzi Schemes Losses from the sale or exchange of an asset with a qualifying basis Losses arising from any mark-to-market treatment of an item Certain Swap losses (see Notice 2006-16 ) For additional information on losses that do not have to be reported on Form 8886, see Revenue Procedure 2004-66 and Revenue Ruling 2009-9.