Pass-through tax rules MCP Server

by passthroughtax Your server? Claim it

answering

Pass-through tax rules is answering right now. Last checked 1 min ago. It exposes 4 tools.

Cited, tax-year-dated rules for state PTET, the federal SALT cap, and bonus-depreciation conformity.

Uptime history 20 hours of history · worst hour 0%

20 hours agonow

50.7%

Uptime 24h

38 of 75 checks

Tools

read from the server

614 ms

Response time

average over 24h

open, no key

Access

streamable-http

Pass-through tax rules does not always answer

Over the last week it answered 50.7% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add pass-through-tax-rules --transport http https://passthroughtax.com/api/mcp

Settings → Connectors → Add custom connector, then paste this address

https://passthroughtax.com/api/mcp

~/.codex/config.toml

[mcp_servers.pass-through-tax-rules]
url = "https://passthroughtax.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "pass-through-tax-rules": {
      "url": "https://passthroughtax.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "pass-through-tax-rules": {
      "type": "http",
      "url": "https://passthroughtax.com/api/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

bonus

bonus_conformity

Whether a state conforms to IRC 168(k) bonus depreciation and IRC 179 for a tax year, its IRC conformity date, and the add-back or subtraction in plain terms. Unverified fields are null. Unknown states and years are not_covered.

coverage

coverage

List jurisdictions and tax years in this dataset. elective_ptet_2026 counts only 2026 files with an elective PTET. no_elective_ptet_2026 and not_effective_2026 are separate and are not PTET states for 2026.

ptet

ptet_rules

Elective pass-through entity tax for one state and tax year: eligibility, who elects, deadline, rate, owner credit or exclusion, estimates, and sunset. Returns not_covered when this server has no file. Informational, not tax advice.

salt

salt_cap

Compute the federal SALT deduction cap under 26 USC 164(b)(6) and (b)(7) for a tax year, filing status, and modified adjusted gross income. Returns the cap and the steps, not the deduction. Years before 2018 are not_covered. MAGI is used to compute and is not written to the usage log.

Endpoints

URL	Transport	State	Latency	Checked
https://passthroughtax.com/api/mcp	streamable-http	answering	318 ms	1 min ago

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Pass-through tax rules — questions

Answers built from our own checks of this server.

What can Pass-through tax rules do?

It exposes 4 tools, read directly from the server on our last check. Among them: bonus_conformity, coverage, ptet_rules, salt_cap. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Pass-through tax rules working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 38 of 75 checks got a reply (50.7%), average response time 614 ms. The bar chart above shows every period we have measured.

How do I connect Pass-through tax rules?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Pass-through tax rules need an API key?

No. Pass-through tax rules completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Pass-through tax rules?

It answers our handshake in 614 ms on average, which is faster than 20% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.