Mexican Payroll & Tax Calculator for ChatGPT

dev.tinyapis/mx-fiscal

Deterministic Mexican payroll & tax math: finiquito, ISR, aguinaldo, IMSS (2026 tables).

client:ChatGPT transport:streamable-http tools:4

Install Mexican Payroll & Tax Calculator in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://fiscal.tinyapis.dev/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs