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990.tax nonprofit lookup MCP Server

by 990 Your server? Claim it
answering

990.tax nonprofit lookup is answering right now. Last checked 9 min ago. It exposes 8 tools.

IRS records on US nonprofits: exempt status, revocations, Form 990 financials, due dates, stats.

Uptime history 4 days of history
4 days agonow
100.0%
Uptime 24h
91 of 91 checks
8
Tools
read from the server
398 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check 990.tax nonprofit lookup every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

run in your terminal
claude mcp add nonprofit-lookup --transport http https://990.tax/mcp
Settings → Connectors → Add custom connector, then paste this address
https://990.tax/mcp
~/.codex/config.toml
[mcp_servers.nonprofit-lookup]
url = "https://990.tax/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "nonprofit-lookup": {
      "url": "https://990.tax/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "nonprofit-lookup": {
      "type": "http",
      "url": "https://990.tax/mcp"
    }
  }
}

Available tools 8

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

nonprofit
get_nonprofit_profile
One organization's IRS record: exempt status, 501(c) subsection, NTEE category, ruling year, deductibility (Publication 78), fiscal year end, which return it files, last filing, and the latest e-filed financial summary. Optional sections: financials (up to 5 years of revenue, expenses, assets from e-filed Form 990/990-EZ/990-PF), officers (up to 15 officers, directors and key employees with compensation from the latest e-filed return), filing_history (e-Postcards and e-filed returns).
get_nonprofit_stats
Counts and totals for US tax-exempt organizations from IRS public data: national, one state, or one NTEE major category (A-Z). Active organizations, 990-N filers, revocations, and revenue, assets, employees and pay from e-filed returns; national adds e-Postcard filers by year, revocations by month and organizations by category.
exempt
check_exempt_status
Whether the IRS automatically revoked an organization's tax exemption (revocation, posting and reinstatement dates), and which of its last three ended accounting years have no return on the IRS public files. Three consecutive missing years revoke the exemption (IRC 6033(j)).
explain
explain_irs_reject_code
Plain-English meaning of an IRS Modernized e-File business rule reject code for Forms 990-N, 990-EZ, 990 and 8868 (e.g. R0000-922-01), the IRS rule text, and how to fix it.
filing
get_filing_due_date
Due date of a Form 990-N, 990-EZ, 990 or 990-PF for a fiscal year end and tax year, moved off weekends and legal holidays, the Form 8868 extended due date (none for the 990-N), days remaining, and late-filing consequences. Give the fiscal year end month or an EIN. Tax year = the calendar year the accounting year begins in; default is the latest ended year.
nonprofits
search_nonprofits
Find US tax-exempt organizations by name or EIN in IRS records. Returns up to 10 matches with EIN, city, state, exempt status (active, revoked, reinstated, terminated) and the latest form filed.
top
get_top_nonprofits
Ranked lists from e-filed Form 990 returns, national (25) or per state (10): highest-paid executives, largest by revenue, most money raised, richest by net assets, biggest employers.
which
which_990_form
Which annual return applies under the IRS thresholds: 990-N (gross receipts normally $50,000 or less), 990-EZ (under $200,000 and assets under $500,000), 990, 990-PF, or none (churches, group-return members). With an EIN, missing amounts come from the IRS Business Master File. Cites the IRS rule.

Endpoints

URLTransportStateLatencyChecked
https://990.tax/mcp streamable-http answering 433 ms 9 min ago

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990.tax nonprofit lookup — questions

Answers built from our own checks of this server.

What can 990.tax nonprofit lookup do?
It exposes 8 tools, read directly from the server on our last check. Among them: check_exempt_status, explain_irs_reject_code, get_filing_due_date, get_nonprofit_profile, get_nonprofit_stats, get_top_nonprofits and 2 more. 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 990.tax nonprofit lookup working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 398 ms. The bar chart above shows every period we have measured.
How do I connect 990.tax nonprofit lookup?
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 990.tax nonprofit lookup need an API key?
No. 990.tax nonprofit lookup completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is 990.tax nonprofit lookup?
It answers our handshake in 398 ms on average, which is faster than 33% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.