Verified Numbers
Current, source-cited US federal tax and business constants for AI agents, including mileage rates, SE tax, income tax brackets, and retirement limits.
How to pay
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Free
Predictable monthly cost with included usage. Best for steady, high-volume traffic.
- Unlimited tools within plan limits
- One API key, billed once a month
- Cancel any time
Your AI's tax numbers are stale. The IRS made a rare mid-year mileage change effective July 1, 2026: the business rate jumped from 72.5 to 76 cents per mile (Announcement 2026-11). Any model trained before July reports the old number with full confidence. Try it: ask your model for the current rate, then call get_mileage_rate here and compare.
9 deterministic tools, every response source-cited:
- Mileage rates and deductions (handles both 2026 rate periods)
- Self-employment tax with wage-base cap and Additional Medicare
- Federal income tax via Rev. Proc. 2025-32 brackets
- Standard deduction, retirement and HSA limits, quarterly deadlines
- Quarterly estimated-tax calculator with safe-harbor comparison
- Full data provenance tool: what was verified, when, against which source
Built to be trusted:
- Primary source (IRS/SSA) and last-verified date in every payload
- Refuses rather than guesses: out-of-scope requests raise errors, never fabricated numbers
- Pure lookup and arithmetic. No LLM calls, no external requests, sub-millisecond responses
- Maintenance SLA: constants re-verified quarterly and within 7 days of any IRS announcement
Pricing: Free 50 requests/month, enough to evaluate every tool. Then $0.01 per request. Pay only for what you use.
Code is MIT: github.com/jfortier93/verified-numbers-mcp
Educational reference only. Not tax, legal, or financial advice. Federal only in v1; state constants on the roadmap.