# tax-engine MCP server

Deterministic Czech OSVC tax tools for 2026: tax, insurance, deadlines, VAT and exchange rates.

## Links
- Registry page: https://www.getdrio.com/mcp/cz-freelax-tax-engine
- Website: https://freelax.cz/connect

## Install
- Endpoint: https://freelax.cz/api/mcp
- Auth: Not captured

## Setup notes
- Remote endpoint: https://freelax.cz/api/mcp

## Tools
- compute_year (Full-year OSVČ tax computation) - Computes a full Czech OSVČ tax year from personal facts: income tax with credits (children, spouse, deductions), social and health insurance, monthly set-aside, safe-to-spend, flat-tax band and regime-eligibility evaluation. All figures come from the deterministic Freelax engine, never from the model. Endpoint: https://freelax.cz/api/mcp
- calc_set_aside (Monthly tax set-aside calculator) - How much of a monthly OSVČ income to set aside for Czech income tax, social and health insurance, and what remains safe to spend. Supports mixed §7 business + §9 rental income and the paušální daň (flat tax) regimes. Endpoint: https://freelax.cz/api/mcp
- compare_regimes (Standard vs paušální daň comparison) - Compares the standard OSVČ regime against paušální daň (flat tax) for a yearly income, including tax credits that would be lost with the flat tax (children, spouse), and recommends the cheaper regime. Endpoint: https://freelax.cz/api/mcp
- calc_flat_tax_settlement (Paušální daň year-end settlement) - Given the paušální daň band you paid and the actual annual income, computes whether you owe a doplatek (top-up), get a vratka (refund), or must exit the flat-tax regime (income above 2,000,000 CZK). Endpoint: https://freelax.cz/api/mcp
- estimate_penalty (Late-payment penalty estimate) - Estimates the Czech penalty/interest for a late payment or filing: repo rate + 8 p.p. for insurance and tax interest (3.5% H1 / 3.75% H2 2026), 3 grace days for tax payments, 200 CZK health aggregation floor and the 1,000 CZK tax non-assessment threshold. A dated estimate is rejected when its required rate period falls outside the implemented history. Endpoint: https://freelax.cz/api/mcp
- convert_eur_czk (EUR → CZK conversion (ČNB rate)) - Converts an EUR amount to CZK using the Czech National Bank daily exchange rate (the rate used for Czech tax purposes). Reports the rate, its publication date and whether a stale cached ČNB publication had to be used. Fails closed when no verified ČNB rate is available. Endpoint: https://freelax.cz/api/mcp
- get_filing_deadlines (DPFO filing deadline (daňové přiznání)) - Deadline for the Czech personal income tax return (DPFO) for a given tax year, per filing route: paper, self-filed electronic, or via tax advisor. Weekend and holiday shifts are applied. Endpoint: https://freelax.cz/api/mcp
- get_prehled_deadlines (Přehled deadlines (ČSSZ + zdravotní pojišťovna)) - Filing deadlines for the annual OSVČ Přehled o příjmech a výdajích for both social insurance (ČSSZ) and the health insurer, per tax-return filing route, plus the payment due date (8 calendar days after the filing deadline). Endpoint: https://freelax.cz/api/mcp
- czech_working_days (Czech holidays and working-day shifts) - Czech public holidays for a year (including movable Easter feasts) and, for a specific date, whether it is a working day and the next working day a statutory deadline would shift to. Endpoint: https://freelax.cz/api/mcp
- check_flat_tax_eligibility (Paušální daň eligibility check) - Screens whether an OSVČ may enter or stay in the paušální daň (flat tax) regime: public health insurance participation (decisive for foreigners), VAT-payer status, income ceiling 2,000,000 CZK, side income and secondary activity. Returns reasons with severity. Endpoint: https://freelax.cz/api/mcp
- get_flat_tax_band (Paušální daň band lookup) - Which paušální daň band (pásmo 1/2/3) an annual income falls into given the expense flat-rate, the current monthly payment for that band, and the next income threshold to watch. Endpoint: https://freelax.cz/api/mcp
- check_thresholds (Statutory income threshold monitor) - Checks an annual income against the four statutory thresholds: VAT registration 2,000,000 CZK, immediate VAT registration 2,536,500 CZK, the 23% higher tax bracket, and the paušální daň eligibility ceiling. Reports approaching (90%), exceeded and remaining amounts. Endpoint: https://freelax.cz/api/mcp
- check_io_trigger (Identified person (identifikovaná osoba) trigger check) - Checks whether buying services from abroad (Google Ads, Meta, ChatGPT, hosting…) or selling services to EU businesses has made an OSVČ an identifikovaná osoba under § 6h/§ 6i ZDPH, with the 15-day registration deadline (§ 97) and fact-freshness handling. Verdict: ok / check / act_now. Endpoint: https://freelax.cz/api/mcp
- get_rule_source (Rule citation and verification lookup) - For a Czech OSVČ tax topic, returns the governing rule with current values, primary-source citations (zákon, ČSSZ, VZP, Finanční správa) with verification dates, and related Freelax articles. Topics: pausalni_dan, identifikovana_osoba, dph_registrace, zalohy, prehledy, penale, danove_pasmo_23, vedlejsi_cinnost. Endpoint: https://freelax.cz/api/mcp

## Resources
Not captured

## Prompts
Not captured

## Metadata
- Owner: cz.freelax
- Version: 1.0.0
- Runtime: Streamable Http
- Transports: HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: Aug 1, 2026
- Source: https://registry.modelcontextprotocol.io