# Tax Numbers Get US federal tax figures, each with the IRS document it came from. It is free, with no sign-up and no key. ## What it does Get the US federal tax numbers right, with the IRS document each one comes from. Ask "what are the 2026 tax brackets for a married couple?", "what is the standard deduction for head of household?", "what was the IRS mileage rate on 15 March?", "when is the next estimated tax payment due?" or "roughly how much federal tax on 90,000 dollars of wages and 30,000 dollars of freelance income?". Tax Numbers holds the federal income tax figures for tax years 2025 and 2026: brackets, standard deduction, long-term capital gains thresholds, the Social Security wage base and self-employment tax, 401(k) and IRA limits, the standard mileage rates, and the filing and estimated-payment deadlines. Every figure comes with the Revenue Procedure, notice or IRS page it was read from, and every answer says when the table was last verified. A year is added only after all of its figures have been checked. It can also work out a simple federal estimate: standard deduction only, with self-employment tax, long-term capital gains and the Additional Medicare Tax. Every estimate lists its assumptions and what it leaves out (credits, state tax, alternative minimum tax, itemized deductions and more), and says it is an estimate and not tax advice. It also answers a seller's question about registration: tax_duty takes where you sell from, where your buyers are (an EU country, the United Kingdom or a US state), what you sell and your yearly sales, and says whether you must register, the limit, the standard rate and how often you file. Every answer links the official tax authority page it comes from, shows the day that page was read and ends with a note to check with an accountant. It covers the 27 EU member states with the One Stop Shop limit of 10,000 euros, the United Kingdom and 14 US states. A place that is not in the table gets an explicit not covered answer with the list of places that are, never a guess. Reduced rates, local taxes, sales to businesses and domestic limits inside an EU country are not included. It does not fill in or file returns, give advice on what to do, or cover US state income tax. Your figures are used for the one calculation and are not stored; the only lasting record is a daily count of calls per tool. - Looks up federal tax brackets, standard deduction and capital gains thresholds with IRS citations - Gives the Social Security wage base and self-employment tax rules - Gives 401(k) and IRA contribution limits - Finds the IRS standard mileage rate for any date - Lists filing and estimated-payment deadlines for a tax year - Estimates federal tax with stated assumptions and exclusions - Says if a seller must register for VAT or sales tax in the EU, UK or a US state, with limit, rate and filing - Adds an official source link, the check date and an accountant note to every duty answer ## Who it is for Anyone who asks an AI assistant a question like this one: “What is the 2026 standard deduction for a single filer?” Roles that use it at work: Compliance reader. Role guides that use it: [Compliance reader](https://tools.openkrill.app/for/compliance-reader). ## Price Tax Numbers is free to use. There is no sign-up, no account and no API key. Calls are limited to 60 calls a minute per network and 5000 calls a day per server, shared by all callers. Repeat questions are answered from a cache. ## Tools it offers - `get_tax_parameters`: Look up US federal tax figures - `get_mileage_rate`: Look up the IRS mileage rate - `tax_deadlines`: List US federal tax deadlines - `estimate_federal_tax`: Estimate US federal income tax - `tax_duty`: Check VAT or sales tax registration duty ## Connect The MCP server is `https://tax.openkrill.app/mcp` (streamable HTTP). It needs no key. Claude Code, in one command: ``` claude mcp add --transport http tax https://tax.openkrill.app/mcp ``` Hermes Agent, in one command that answers its two setup questions (no key, enable all tools): ``` printf 'n\ny\n' | hermes mcp add tax --url https://tax.openkrill.app/mcp ``` Or add these lines to `~/.hermes/config.yaml`, under an existing `mcp_servers:` key if the file has one. Start a new Hermes session after either step. ``` mcp_servers: tax: url: https://tax.openkrill.app/mcp ``` Any other agent: give it this page's Markdown address, `https://tools.openkrill.app/tools/tax.md`, and ask it to connect Tax Numbers. Install guides, each checked with a real call: [Tax Numbers in ChatGPT](https://tools.openkrill.app/integrations/tax/chatgpt), [Tax Numbers in Claude](https://tools.openkrill.app/integrations/tax/claude), [Tax Numbers in Cursor](https://tools.openkrill.app/integrations/tax/cursor), [Tax Numbers in VS Code](https://tools.openkrill.app/integrations/tax/vscode), [Tax Numbers in Pi](https://tools.openkrill.app/integrations/tax/pi). ## Job recipes for agents Step-by-step recipes that walk an agent through 3 jobs with this server's tools: - Look up US federal tax figures, with `get_tax_parameters` - Check VAT or sales tax registration duty, with `tax_duty` - Look up the IRS mileage rate, with `get_mileage_rate` [Download the recipes as SKILL.md](https://tools.openkrill.app/skills/tax-jobs/SKILL.md). Save it as `tax-jobs/SKILL.md` in your agent's skills folder. A connected MCP client gets the same recipes from `prompts/list` on the gateway, `https://api.openkrill.app/gateway/mcp`. It is listed under Research and public facts in the [full tool list](https://tools.openkrill.app/tools). The same facts in plain text are in [llms.txt](https://tools.openkrill.app/llms.txt). Source: the Tax Numbers listing, version 1.1.0. As of 2026-10-18.