MCP server

Tax Numbers

app.openkrill/tax

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Get the US federal tax numbers right, with the IRS document each one comes from.

Website Source

At a glance

Type

MCP server

Publisher

openkrill.app (verified by the MCP Registry)

Status

Working at last check

Tools

7

Token cost

About 2,958 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http tax https://tax.openkrill.app/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.tax]
url = "https://tax.openkrill.app/mcp"

Gemini CLI

{"mcpServers":{"tax":{"httpUrl":"https://tax.openkrill.app/mcp"}}}

Cursor

{"mcpServers":{"tax":{"url":"https://tax.openkrill.app/mcp"}}}

VS Code

{"servers":{"tax":{"type":"http","url":"https://tax.openkrill.app/mcp"}}}

Antigravity

agy mcp add tax https://tax.openkrill.app/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"tax","server_url":"https://tax.openkrill.app/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"tax","server_url":"https://tax.openkrill.app/mcp"}

Tools

• estimate_federal_tax ~639 tokens
  Use this when the user wants a rough US federal income tax figure, for example "how much federal tax on $90,000 of wages", "estimate my tax with $40,000 of freelance income", "what is my marginal rate". Pass the tax year, filing_status (single, mfj, mfs, hoh) and wages in dollars, and optionally sel
• get_mileage_rate ~243 tokens
  Use this when the user asks for the IRS standard mileage rate on a day, for example "what was the business mileage rate on 15 March 2026", "how much per mile can I deduct for charity driving", "medical mileage rate in 2025". Pass the date (YYYY-MM-DD); the rate in force that day is returned in cents
• get_tax_parameters ~438 tokens
  Use this when the user asks for a published US federal tax figure, for example "what are the 2026 tax brackets for married filing jointly", "standard deduction for head of household in 2025", "long-term capital gains thresholds", "Social Security wage base", "401(k) contribution limit". Pass the tax
• tax_deadlines ~294 tokens
  Use this when the user asks when a US federal individual tax date falls, for example "when is the 2025 return due", "when is the extension deadline", "when is the next estimated tax payment due". Pass the tax year (the year the income was earned) and optionally as_of (today, YYYY-MM-DD) to get the n
• tax_duty ~767 tokens
  Use this when a seller asks whether they must register for VAT or sales tax in a place, for example "I sell e-books from Germany and made 14,000 EUR to buyers in France, do I need to register?" or "my US company sells SaaS with 150,000 USD of sales to Texas, do I owe sales tax?". Pass seller_country

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