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Categories › Business & Finance › Accounting & invoicing

cz.freelax/tax-engine

MCP serverVerified domain · freelax.czRemote● LiveFree to try

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

Install

Remote server: your requests and data go to freelax.cz. Claude Code: claude mcp add --transport http tax-engine https://freelax.cz/api/mcp · Claude app: Settings → Connectors → Add custom connector.

What it can do

The tools this server listed when we connected to it, in its own words.

  • compute_year — Computes a full Czech OSVČ tax year from personal facts: income tax with credits (children, spouse, deductions), social and health insurance
  • calc_set_aside — 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 m
  • compare_regimes — Compares the standard OSVČ regime against paušální daň (flat tax) for a yearly income, including tax credits that would be lost with the fla
  • calc_flat_tax_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 m
  • estimate_penalty — 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 202
  • convert_eur_czk — Converts an EUR amount to CZK using the Czech National Bank daily exchange rate (the rate used for Czech tax purposes). Reports the rate, it
  • get_filing_deadlines — Deadline for the Czech personal income tax return (DPFO) for a given tax year, per filing route: paper, self-filed electronic, or via tax ad
  • get_prehled_deadlines — Filing deadlines for the annual OSVČ Přehled o příjmech a výdajích for both social insurance (ČSSZ) and the health insurer, per tax-return f
  • czech_working_days — Czech public holidays for a year (including movable Easter feasts) and, for a specific date, whether it is a working day and the next workin
  • check_flat_tax_eligibility — Screens whether an OSVČ may enter or stay in the paušální daň (flat tax) regime: public health insurance participation (decisive for foreign
  • get_flat_tax_band — 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, an
  • check_thresholds — Checks an annual income against the four statutory thresholds: VAT registration 2,000,000 CZK, immediate VAT registration 2,536,500 CZK, the
  • check_io_trigger — Checks whether buying services from abroad (Google Ads, Meta, ChatGPT, hosting…) or selling services to EU businesses has made an OSVČ an id
  • get_rule_source — For a Czech OSVČ tax topic, returns the governing rule with current values, primary-source citations (zákon, ČSSZ, VZP, Finanční správa) wit

KitScout test notes

Not tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.

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