Taiwan Tax MCP Server

台灣稅務資訊查詢服務：綜合所得稅計算、營業稅稅籍查詢、稅率級距表、報稅行事曆與稅收統計。

Tools

| Tool | Description | Required Params | |------|-------------|-----------------| | calculate_income_tax | 計算綜合所得稅（含稅率級距） | annualIncome: number | | lookup_business_tax | 查詢營業稅稅籍登記資料（依統一編號或名稱） | keyword: string | | get_tax_brackets | 取得現行所得稅稅率級距表 | (none) | | get_tax_calendar | 取得報稅行事曆（各稅目申報期限） | (none) | | get_tax_statistics | 查詢稅收統計資料 | (none) |

Endpoints

| Path | Transport | Description | |------|-----------|-------------| | POST /mcp | MCP Streamable HTTP | Claude Desktop / Cursor / MCP clients | | POST / | JSON-RPC 2.0 | Legacy — Composer backward compatible | | GET / | HTTP | Server info |

Quick Start

Prerequisites

• None — all data sources are public open data

Development

npm install
npm run dev    # http://localhost:8787
npm test       # 63 tests

Environment Variables

| Variable | Required | Description | |----------|----------|-------------| | SERVER_NAME | Auto | Set in wrangler.toml | | SERVER_VERSION | Auto | Set in wrangler.toml |

Usage Example

# MCP Streamable HTTP — list tools
curl -X POST http://localhost:8787/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

# Call a tool — 計算綜合所得稅
curl -X POST http://localhost:8787/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"calculate_income_tax","arguments":{"annualIncome":1000000,"deductions":120000}}}'

Data Source

• API: FIA 營業稅稅籍資料 CSV (https://eip.fia.gov.tw/data/BGMOPEN1.csv)
• API: 政府開放資料平台 (https://data.gov.tw/api/v2/rest/datastore)
• Auth: None (public open data)
• Rate Limit: N/A (public endpoints)

File Structure

src/
  index.ts         — Hono HTTP entry + /mcp route
  mcp-server.ts    — McpServer factory (Zod schemas)
  mcp-handler.ts   — Legacy JSON-RPC handler
  client.ts        — API client (FIA CSV + data.gov.tw)
  types.ts         — TypeScript types
  tools/           — Tool implementations
tests/             — Vitest tests (63 tests)
wrangler.toml      — Worker config
package.json       — Dependencies