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Interactions Between the SALT Deduction and AMT Exemption

When considering the extension of the SALT cap in 2025, it’s important to understand the interaction between the SALT cap and the AMT exemption.

TOPLINE TAKEAWAYS:

  • High-income taxpayers in high-tax states already faced a cap on their SALT deductions prior to the TCJA because the AMT limited their SALT deduction at a lower level than most realize.
  • As a result, combining the TCJA’s higher AMT threshold and a more generous SALT cap could allow itemizers in high-tax states to deduct more SALT than they ever could.
  • Families in high-tax states pay lower taxes under the One Big Beautiful Bill (OBBB)– considering the totality of the changes – than if the TCJA were allowed to expire. This includes the vast majority of taxpayers earning $250,000 to $500,000.

    First Published on May, 12025