Tax residence, treaty tie-breaker, next steps, exit tax, special tax regimes, business forms.
Connect Remote server
claude mcp add --transport http doubletaxation https://doubletaxation.app/api/mcp{
"mcpServers": {
"doubletaxation": {
"url": "https://doubletaxation.app/api/mcp"
}
}
}{
"servers": {
"doubletaxation": {
"type": "http",
"url": "https://doubletaxation.app/api/mcp"
}
}
}Settings > Connectors > Add custom connector
URL: https://doubletaxation.app/api/mcpTools 10 found in our last check
list_versionsLists the 24 versions of DoubleTaxation. Each version is written for taxpayers of one home state (in its language) and compares it with 27 other countries. Call this first if you are not sure which version fits the user.
list_countriesLists 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_residencyDetermines 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_burdenIncome 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_daysCounts 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 a…
next_stepsWhat 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_checkWhether 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_searchSpecial 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_formsBusiness 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,…
explain_residencyAnswers general questions about tax residence and the theory behind it from the monograph by DoubleTaxation's legal expert, Yevhen Marynchak, "The Financial-Legal Link Between an Individual and the State" (2nd edition, 2020): 893 questions and answers covering what resident stat…
Details
| Endpoint | https://doubletaxation.app/api/mcp (Streamable HTTP) |
| First published | 6 Nov 2026 |
| Last updated | 6 Nov 2026 |
| Registry name | app.doubletaxation/doubletaxation |
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