Not tax, legal, or accounting advice — the published math, with its source.bizphoton.com publishes calculators and verified government figures for education and planning. It is not tax, legal, accounting, or financial advice, and using this site does not create a professional relationship. Every changing figure links the official source it came from. For advice about your own business, consult a licensed professional in your state.

Developers

BizPhoton exposes four developer surfaces: an MCP server for AI assistants, public versioned rule packs, embeddable calculator widgets, and llms.txt. Everything is backed by the same verified data our own pages use — every response and every pack carries its provenance. Almost no calculator site publishes its underlying figures; this one does, on purpose, because being the machine-readable source of record is worth more than the page views it might cost.

MCP server

Streamable-HTTP Model Context Protocol endpoint:

https://api.cosyslabs.com/bizphoton/mcp

Tools are generated from the same registry that powers the site’s calculators, so the live list is always the server’s own tools/list response. Every tool response cites the rule pack it computed from — packId, verifiedDate, and the official sourceUrl — and carries the estimate-only disclaimer, so an assistant can never present a figure without the caveat and the source that belong to it. Coverage follows the clusters of the site, with tools landing as each cluster’s rule packs are verified:

Break-Even & Pricing
Employer Costs & Payroll Taxes
LLC & Startup Costs
BizForce AI Suite

See the MCP quickstart for Claude Desktop and ChatGPT setup.

Public rule packs

Every changing figure on this site (the Social Security wage base, Medicare and federal unemployment rates, state new-employer unemployment rates and taxable wage bases, state LLC filing and annual fees, franchise-tax obligations, Canadian incorporation fees) lives in a versioned JSON rule pack, published read-only:

https://bizphoton.com/rulepacks/index.json   — pack directory
https://bizphoton.com/rulepacks/<packId>.json — individual packs

Each pack includes provenance fields: packId, effectiveYear, sourceUrl (the agency document it was transcribed from), verifiedDate, and status (verified, pending, stale, or projected). If you consume a pack, honor status — a stale rate should fail loud, not silently, and a projected figure carries the method that produced it and must be labeled as a projection wherever you show it. A state with no pack means we could not open an official source for it, not that it has no rate. The data page describes the dataset in full.

llms.txt

AI crawlers and agents should start at /llms.txt, which maps the site’s tools, rule packs, and compliance notes in a machine-friendly format.

Embeddable widgets

Embed any calculator with a single iframe using the /embed/<slug> pattern:

<iframe
  src="https://bizphoton.com/embed/<tool-slug>"
  width="100%"
  height="620"
  style="border:none;border-radius:12px"
  title="Calculator name"
></iframe>

No API key required.

Attribution requirements

Embeds include an attribution link back to bizphoton.com — it and the disclaimer beneath it must remain visible and unmodified.
If you republish figures from our rule packs, cite both the official source (sourceUrl) and this site as the transcription source.
Bulk scraping or redistribution of the site or rule packs without written permission is not allowed — ask us instead.
Anything you build on this data inherits our framing: estimates only, not tax, legal, or accounting advice, and never a promise about what someone will owe or save.

Contact

Integration or partnership inquiries: [email protected]