Penalties Abusive tax shelters

These penalties are known as Investor (participant) penalties.

  1. Noneconomic Substance Transaction Understatement (NEST) penalty

    Why you received this penalty

    You entered into a transaction that did not have economic substance resulting in understatement.

    Visit R&TC 19774 for more information.

    Penalty

    • 40% of the understatement
    • 20% of the understatement if the transaction is adequately disclosed

    Relief of penalty

    To request relief from the penalty:

    Complete form Request for Chief Counsel to Relieve Penalties (FTB 626)

    • Attach a statement specifying the facts and reasons supporting the request for relief from the penalty
    • FTBs Chief Counsel may reduce all or a portion of the penalty once assessed

    The taxpayer cannot appeal or challenge the Chief Counsel's decision.

    R&TC 19774

  2. Interest based penalty

    Why you received this penalty

    You entered into a transaction that did not have economic substance resulting in understatement.

    Visit R&TC 19774 for more information.

    Penalty

    100% of the interest payable on the additional tax for that transaction.

    Relief of penalty

    • 50% of the interest payable on the additional tax for that transaction reported on your amended return
    • 100% of the interest payable on the additional tax for that transaction not reported on your amended return

    R&TC 19777

  3. Accuracy Related Penalty (ARP)

    Why you received this penalty

    You met one of the ground(s) under IRC Section 6662.

    Penalty

    • 20% of the underpayment of tax.
    • 40% of the underpayment of tax in certain circumstances.

    Visit Penalty Reference Chart (FTB 1024) for more information.

    Relief of penalty

    Visit IRC 6664 for more information.

    R&TC 19164

  4. Reportable Transaction Accuracy Related Penalty

    Why you received this penalty

    You have additional tax related to a reportable or listed transaction.

    Penalty

    • 20% of the understatement
    • 30% of the understatement, if you did not report the transaction (IRC 6011)

    Relief of penalty

    Complete form Request for Chief Counsel to Relieve Penalties (FTB 626)

    • Attach a statement specifying the facts and reasons supporting the request for relief from the penalty
    • FTBs Chief Counsel may reduce all or a portion of the penalty once assessed

    The taxpayer cannot appeal or challenge the Chief Counsel's decision. Chief Counsel relief does not apply to listed transactions.

    R&TC 19164.5

  5. Failure to disclose reportable and listed transaction penalty

    Why you received this penalty

    You met all of the following:

    • You participated in a reportable or listed transaction
    • You did not report it per R&TC 18407
    • Your taxable income is over $200,000

    Penalty

    Listed transaction

    $30,000 for each unreported listed transaction

    Relief does not apply to listed transactions.

    Reportable transaction (other than listed)

    $15,000 for each unreported reportable transaction

    Relief of penalty

    Complete form Request for Chief Counsel to Relieve Penalties (FTB 626)

    • Attach a statement specifying the facts and reasons supporting the request for relief from the penalty
    • FTBs Chief Counsel may reduce all or a portion of the penalty once assessed

    The taxpayer cannot appeal or challenge the Chief Counsel's decision.

    R&TC 19772

Last updated: 09/24/2025