Pascaline

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ISO Exercise AMT Calculator beta

Form 6251 AMT on ISO exercises with the post-OBBBA exemption phaseout, minimum-tax-credit carryforward, plus NSO/RSU/ESPP and 83(b) analysis.

Get an API key Docs

Endpoints

  • POST /equity/calculate-tax
  • POST /equity/83b-analysis

MCP tools

  • calculate_equity_tax

Example

curl -X POST https://pascaline.io/equity/calculate-tax \
  -H 'content-type: application/json' \
  -H 'x-api-key: <keyId>.<secret>' \
  -d '{ ... }'

Responses include data_as_of, formula_version (2026.1), citations, and tier (beta). See the full reference and the verification process.

ISO AMT calculator API · Form 6251 API · incentive stock option tax API · 83(b) election calculator