DoubleTaxation

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "doubletaxation": {
      "type": "http",
      "url": "https://doubletaxation.app/api/mcp"
    }
  }
}

9 tools

• list_versions

  Lists the 18 versions of DoubleTaxation. Each version is written for taxpayers of one home state (in its language) and compares it with 21 other countries. Call this first if you are not sure which version fits the user.

• list_countries

  Lists the countries that can be checked against the home state of a version: whether a tax treaty is in force (title, dates, link), whether per-income treaty rules and tax burden data exist, plus the allowed citizenship options and years for check_residency.

• check_residency

  Determines the person's tax residence between the version's home state and another country, step by step. Without all answers it returns status "needs_answer" and the next question (id, text, options); ask the user and call again with all answers collected so far. When complete…

• tax_burden

  Income tax and social contributions on an annual salary in one or more countries (OECD Taxing Wages method: single person, no children, full-year employee). Returns net pay, personal rate, tax wedge and marginal rate, sorted from lowest to highest personal rate. 21 countries are…

• count_days

  Counts days of stay per country from the trips the user provides (country, from, to) under each country's own counting rule (calendar year, tax year, any 12 months, US substantial presence test, continuous stay): days in the counting period, the day threshold for tax residence…

• next_steps

  What to do once the tax residence is known (the same blocks as under the result on doubletaxation.app and in check_residency "done"): how to get a certificate of residence, obligations of a resident (returns, deadlines), obligations and options of a non-resident with income from…

• exit_tax_check

  Whether a country levies an exit (departure) tax on individuals who give up tax residence: who pays and on what (assets, thresholds, prior residence period), deferral or relief (e.g. moving within the EU/EEA), the legal norm with a link and the date checked.

• regime_search

  Special and preferential tax regimes for individuals (newcomers / impatriates, employees, self-employed, investors, pensioners) in 21 countries. Filter by country, kind, status and free text. Returns per regime: official name, who it is for, the benefit, duration, how to apply…

• compare_business_forms

  Business tax calculator for a resident of one country and one sector (activity): every legal form (sole proprietor, own company) under every available tax system — total tax and contributions, what remains, rate, line items, why a system is unavailable for the sector or amount…

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