# Mexican Payroll & Tax Calculator MCP server

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

## Links
- Registry page: https://www.getdrio.com/mcp/dev-tinyapis-mx-fiscal
- Website: https://fiscal.tinyapis.dev

## Install
- Endpoint: https://fiscal.tinyapis.dev/mcp
- Auth: Not captured

## Setup notes
- Remote endpoint: https://fiscal.tinyapis.dev/mcp

## Tools
- calc_finiquito - Compute a Mexican finiquito/liquidación (severance) for a resignation or
an unjustified dismissal: prorated christmas bonus, vacations, vacation
premium, pending salary, and (for dismissal) 90-day + 20-day/year
severance and the seniority premium, with Art. 93 exemptions and
separation ISR. Do NOT compute this from memory — LFT bands, UMA
exemptions, and the SDI integration factor are table-driven. Returns
per-concept gross/exempt/taxable, totals, ISR, deductions, and net_total.
 Endpoint: https://fiscal.tinyapis.dev/mcp
- calc_isr - Compute Mexican ISR (income tax) withholding for a monthly or annual
income using the official SAT tables and employment subsidy. Do NOT
estimate ISR from memory — brackets and subsidy change yearly and must
come from this deterministic tool. Returns tax, subsidy_applied,
withholding, the period, and the tax-table year used.
 Endpoint: https://fiscal.tinyapis.dev/mcp
- calc_aguinaldo - Compute a Mexican aguinaldo (year-end bonus): gross, the UMA-based
exempt portion, the taxable portion, its ISR, and the net. Minimum 15
days by law. Do NOT compute from memory — the exemption is UMA-indexed
per year. Returns gross, taxable, exempt, isr, net, and the days used.
 Endpoint: https://fiscal.tinyapis.dev/mcp
- calc_imss - Compute Mexican IMSS social-security contributions: the SDI (integrated
daily wage by seniority) and SBC, plus employer/worker quotas for the
five insurance branches. The work-risk premium (rt_premium) is an input.
Provide either seniority_years (to derive the SDI) or an explicit sdi.
Do NOT compute from memory — quota tables and UMA caps are table-driven.
Returns sdi, sbc, employer_total, worker_total, grand_total, and a
per-branch breakdown.
 Endpoint: https://fiscal.tinyapis.dev/mcp

## Resources
Not captured

## Prompts
Not captured

## Metadata
- Owner: dev.tinyapis
- Version: 1.0.0
- Runtime: Streamable Http
- Transports: HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: Jul 22, 2026
- Source: https://registry.modelcontextprotocol.io