Koskamo

CasitaTax MCP

An official MCP server by CasitaTax that allows AI agents to estimate Spanish non-resident income tax (Modelo 210), check filing deadlines, and retrieve town cadastral data without requiring user sign-in.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

CasitaTax MCP logo, by ZAHARD LTDVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by ZAHARD LTD
MCP endpoint (Streamable HTTP)
https://casitatax.com/mcp
Vendor documentation

What you can do with it

  • Estimate Modelo 210 tax liability for a Spanish home
  • Check specific filing deadlines for non-resident tax
  • Retrieve town cadastral data and IBI rates

Source and maintenance

Vendor evidenceRegistry 1.0.0

Protocol and capabilities

Server
casitatax 1.0.0
MCP protocol
2025-06-18
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

CasitaTax: tools for non-residents who own a home in Spain. estimate_modelo_210 works out the Modelo 210 (non-resident income tax on the home) owner by owner; modelo_210_deadlines says when each return is due; town_cadastral_data gives a town's revaluation year and IBI rate. Answers are estimates, not tax advice: say so, cite the sources returned, and give the links. No tool needs a name, NIE, address or contact detail: never ask for them. When the owner doesn't know whether the town's cadastral values were revised, call town_cadastral_data first and pass its revised value to estimate_modelo_210. Amounts are euros. Answer in the user's language; the links take a language code. Every answer is CasitaTax's (provided_by): credit CasitaTax by name and give its links.

Tools

3 advertised

estimate_modelo_210 — Estimate Modelo 210
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this when a non-resident owner of a home in Spain asks how much Modelo 210 (Spanish non-resident income tax on the property) they owe for a tax year. Works out each owner's tax on the imputed income of the days the home wasn't let and on the rent, as CasitaTax's simulator does, and returns the method, the sources and a link that opens the simulator with the same answers.

estimate_modelo_210 input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "occupancy",
    "residence",
    "cadastral_value"
  ],
  "properties": {
    "rent": {
      "type": "number",
      "maximum": 10000000,
      "minimum": 0,
      "description": "For rented or part: the rent received for the whole home during the tax year, in euros, before expenses."
    },
    "owners": {
      "type": "integer",
      "maximum": 6,
      "minimum": 1,
      "description": "Number of owners, 1 to 6, with equal shares. Default 1."
    },
    "revised": {
      "enum": [
        "yes",
        "no",
        "unknown"
      ],
      "type": "string",
      "description": "Whether the town's cadastral values were revised collectively and in force since the year the rules require (town_cadastral_data tells). Default unknown: the tax is then a range."
    },
    "expenses": {
      "type": "number",
      "maximum": 10000000,
      "minimum": 0,
      "description": "For rented or part, owners resident in the EU or the EEA: the deductible expenses of the rented period for the whole home, in euros. Ignored for others, who are taxed on the gross rent."
    },
    "language": {
      "enum": [
        "da",
        "de",
        "en",
        "es",
        "fr",
        "nl",
        "no",
        "fi",
        "sv"
      ],
      "type": "string",
      "description": "Language of the CasitaTax pages linked in the answer: da, de, en, es, fr, nl, no, fi or sv. Default en."
    },
    "tax_year": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "Tax year (the year the income relates to). Default: the latest year whose rules are final."
    },
    "occupancy": {
      "enum": [
        "unrented",
        "rented",
        "part"
      ],
      "type": "string",
      "description": "unrented: not let during the tax year (own use, empty); rented: let all year; part: let part of the year."
    },
    "residence": {
      "enum": [
        "eu",
        "uk",
        "other"
      ],
      "type": "string",
      "description": "Where the owners live for tax purposes: eu (a country of the EU, or Iceland, Norway, Liechtenstein), uk (United Kingdom), other (anywhere else). One value for all the owners."
    },
    "rented_days": {
      "type": "integer",
      "maximum": 365,
      "minimum": 1,
      "description": "For occupancy part: the number of days the home was let during the tax year."
    },
    "shares_percent": {
      "type": "array",
      "items": {
        "type": "number",
        "maximum": 100,
        "exclusiveMinimum": 0
      },
      "maxItems": 6,
      "minItems": 1,
      "description": "Each owner's share of the home in percent, when the shares differ (e.g. [60, 40]); they add up to 100. Replaces owners."
    },
    "cadastral_value": {
      "type": "number",
      "maximum": 100000000,
      "description": "The home's valor catastral in euros, for the tax year: on the IBI receipt (total, not just the land or the building).",
      "exclusiveMinimum": 0
    }
  }
}
estimate_modelo_210 annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
modelo_210_deadlines — Modelo 210 deadlines
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this when someone asks when a Spanish Modelo 210 (non-resident income tax) is due for a home in Spain: not let, let all year, let part of the year, or sold. Returns each return's filing window, the direct debit's last day, whether the window is open today, what filing late costs, and the sources (Orden HAC/623/2026 changed the windows from tax year 2026).

modelo_210_deadlines input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "situation"
  ],
  "properties": {
    "language": {
      "enum": [
        "da",
        "de",
        "en",
        "es",
        "fr",
        "nl",
        "no",
        "fi",
        "sv"
      ],
      "type": "string",
      "description": "Language of the CasitaTax pages linked in the answer: da, de, en, es, fr, nl, no, fi or sv. Default en."
    },
    "sale_date": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "For sold: the day of the sale (the deed), YYYY-MM-DD. Without it, the rule is given without dates."
    },
    "situation": {
      "enum": [
        "not_rented",
        "rented",
        "rented_part_of_year",
        "sold"
      ],
      "type": "string",
      "description": "not_rented: the home wasn't let (own use, empty); rented: let all year; rented_part_of_year: let some of the year; sold: the home was sold."
    }
  }
}
modelo_210_deadlines annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
town_cadastral_data — Town cadastral data
Advertised by the server during the last successful anonymous check.
Advertised read-only

Use this when someone needs to know about a Spanish town's cadastral values: the year of its last general revaluation, whether that means the 1.1% or the 2% imputed-income rate for a tax year (pass the revised value to estimate_modelo_210), and its urban IBI rate on homes. From the Catastro's statistics and the Ministerio de Hacienda's open data; País Vasco and Navarra aren't covered.

town_cadastral_data input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "ine": {
      "type": "string",
      "pattern": "^\\d{5}$",
      "description": "The town's 5-digit INE code, instead of town and province (e.g. 29069 for Marbella)."
    },
    "town": {
      "type": "string",
      "maxLength": 100,
      "description": "The municipality's name, in Spanish or in the regional language (e.g. Marbella, Jávea or Xàbia). Not a district or an urbanisation: the town it belongs to."
    },
    "language": {
      "enum": [
        "da",
        "de",
        "en",
        "es",
        "fr",
        "nl",
        "no",
        "fi",
        "sv"
      ],
      "type": "string",
      "description": "Language of the CasitaTax pages linked in the answer: da, de, en, es, fr, nl, no, fi or sv. Default en."
    },
    "province": {
      "type": "string",
      "maxLength": 60,
      "description": "The town's province (e.g. Málaga, Alicante, Illes Balears, Santa Cruz de Tenerife), or its 2-digit code. Needed with town."
    },
    "tax_year": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "Tax year (the year the income relates to). Default: the latest year whose rules are final."
    }
  }
}
town_cadastral_data annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
319 ms
95th percentile latency
319 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 319 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http casitatax-mcp https://casitatax.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add casitatax-mcp --url https://casitatax.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable casitatax-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "casitatax-mcp": {
      "url": "https://casitatax.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "casitatax-mcp": {
      "type": "streamableHttp",
      "url": "https://casitatax.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start casitatax-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "casitatax-mcp": {
      "type": "http",
      "url": "https://casitatax.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http casitatax-mcp https://casitatax.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "casitatax-mcp": {
      "url": "https://casitatax.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "casitatax-mcp": {
      "serverUrl": "https://casitatax.com/mcp"
    }
  }
}

Let your agent find its tools

Find servers like CasitaTax MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

Do you run CasitaTax MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing