Pascaline

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§199A QBI Deduction beta

The §199A qualified business income deduction with the post-OBBBA phase-in ranges, SSTB determination, W-2/UBIA limits, and aggregation benefit.

Get an API key Docs

Endpoints

  • POST /qbi/calculate-deduction
  • POST /qbi/sstb-guidance

MCP tools

  • calculate_qbi_deduction

Example

curl -X POST https://pascaline.io/qbi/calculate-deduction \
  -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.

199A QBI deduction calculator API · qualified business income API · SSTB determination API