SAT calculations without hallucination: surcharges, ISR, CFDI, IMSS and payroll — deterministic and verified against the law. Connect it to Claude or your MCP client.
▸ amount 50,000 · due Feb-17 · paid Jun-20
months late: 5 (day-by-day, CFF 21)
surcharges: $5,175.00
TOTAL due: $55,175.00
// verified vs LIF 2026 Art. 11
▸
Models hallucinate rates, and SAT values change every year.
Asking an LLM to compute surcharges or ISR from memory yields plausible but wrong numbers.
UMA, ISR tariffs, surcharges, the Severance & Old-Age curve: it all moves. A hardcoded value is already wrong.
Here the number comes from a deterministic engine over verified current values — zero hallucination in the figure.
SAT compliance + payroll, verified against primary sources.
Late-payment surcharges + inflation update (CFF 17-A/21).
UMA, minimum wage, surcharge & installment rates, with source.
Obligations and deadlines by regime (day 17 + non-working days).
Factors to choose a tax regime — informs, doesn't decide.
Validate a CFDI 4.0's coherence before stamping.
Estimate annual ISR by regime (Art. 152 tariff).
Monthly salary withholding (Art. 96 − employment subsidy).
IMSS worker/employer contributions (2026 CyV curve, SBC, 25-UMA cap).
Year-end bonus: gross, exempt (30 UMA), taxable and ISR.
Severance or dismissal settlement, with indemnities (LFT).
No install. Connect the endpoint and go.
The current-values tool, free and keyless. 50 calculations/month with a free key.
All 10 tools, unlimited. Your API key arrives by email on subscribe. Cancel anytime.
Remote MCP (streamable-http). Works in Claude and any MCP client.
// endpoint
https://menteorama-fiscal-mcp.menteorama.workers.dev/mcp
// authorization
Authorization: Bearer mk_live_…
No. It's informational and deterministic. Confirm every decision with your accountant before filing or paying.
Yes. Every value is verified against official sources (LIF, CFF, LISR, Anexo 8 RMF, DOF) and kept up to date — not hardcoded by the model.
It's a remote MCP server (streamable-http). Add the endpoint to Claude or your MCP client with your API key in the Authorization: Bearer header.
Yes. The Pro subscription is monthly and cancelable anytime; you revert to the Free plan automatically.
Verified, deterministic SAT numbers, inside your agent.
Informational, not tax advice. Verify with your accountant.