Pass-through tax rules

Connect Remote server

claude mcp add --transport http pass-through-tax-rules https://passthroughtax.com/api/mcp

{
  "mcpServers": {
    "pass-through-tax-rules": {
      "url": "https://passthroughtax.com/api/mcp"
    }
  }
}

{
  "servers": {
    "pass-through-tax-rules": {
      "type": "http",
      "url": "https://passthroughtax.com/api/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://passthroughtax.com/api/mcp

Tools 4 found in our last check

• ptet_rules

  Elective pass-through entity tax for one state and tax year: eligibility, who elects, deadline, rate, owner credit or exclusion, estimates, and sunset. Returns not_covered when this server has no file. Informational, not tax advice.

• salt_cap

  Compute the federal SALT deduction cap under 26 USC 164(b)(6) and (b)(7) for a tax year, filing status, and modified adjusted gross income. Returns the cap and the steps, not the deduction. Years before 2018 are not_covered. MAGI is used to compute and is not written to the usag…

• bonus_conformity

  Whether a state conforms to IRC 168(k) bonus depreciation and IRC 179 for a tax year, its IRC conformity date, and the add-back or subtraction in plain terms. Unverified fields are null. Unknown states and years are not_covered.

• coverage

  List jurisdictions and tax years in this dataset. elective_ptet_2026 counts only 2026 files with an elective PTET. no_elective_ptet_2026 and not_effective_2026 are separate and are not PTET states for 2026.

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