Categories › Business & Finance › Accounting & invoicing
Get the US federal tax numbers right, with the IRS document each one comes from.
Remote server: your requests and data go to tax.openkrill.app. Claude Code: claude mcp add --transport http tax-numbers https://tax.openkrill.app/mcp · Claude app: Settings → Connectors → Add custom connector.
The tools this server listed when we connected to it, in its own words.
get_tax_parameters — 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", get_mileage_rate — 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", "tax_deadlines — 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 destimate_federal_tax — 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 tax_duty — 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 14submit_feedback — Send feedback, a bug report or a tool request to the maintainers of the tools on this server: a missing tool, missing or stale data, or a toget_feedback_reply — Read the maintainers' reply to feedback you sent with submit_feedback, given its ticket id. Returns status pending until a reply is ready, tNot tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.