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Tax Numbers

Get US federal tax figures, each with the IRS document it came from.

Price
Free
API key
None
Limit
60 calls a minute
Tools
5
Ask your assistant
What is the 2026 standard deduction for a single filer?

What it does

  • 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

2 more in the full text.

Tools

  • get_tax_parametersLook up US federal tax figures
  • get_mileage_rateLook up the IRS mileage rate
  • tax_deadlinesList US federal tax deadlines
  • estimate_federal_taxEstimate US federal income tax
  • tax_dutyCheck VAT or sales tax registration duty

Connect

https://tax.openkrill.app/mcp

Claude Code:

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

Hermes Agent:

printf 'n\ny\n' | hermes mcp add tax --url https://tax.openkrill.app/mcp

Go further

Full text for agents: tax.md, llms.txt. Version 1.1.0, 2026-10-18.