990.tax nonprofit lookup
REMOTE · 990.TAX
IRS records on US nonprofits: exempt status, revocations, Form 990 financials, due dates, stats.
Available components
Last scanned (18 hours ago)
Scores higher than 55% of remote servers
Reachable. Last reached 4 Nov 2026.
Category Finance and Payments
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1173 tokens (~146/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management3
- Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage94
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 83% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “search_nonprofits” rewrote its description, which is the text the model reads security
- Stability: unverified → 0.03 ▲ functional
- 3 Nov 26 69
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://990.tax/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=990.tax | CN=WE1,O=Google Trust Services,C=US | 18 Sept 2026 | 17 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 64f2bfbc3b9bc8ac131c65aba97066a0 |
| SANs: 990.tax, *.990.tax | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of 990.tax. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| tax. | present | 3385 | 8 | Verified |
| 990.tax. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://990.tax/mcp | Verified | 200 | |
| http (plaintext) | http://990.tax/mcp | HTTPS enforced | 301 | https://990.tax/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
check_exempt_status Check tax-exempt status and missing years ~87
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)).
| Name | Type | Req | Description |
|---|---|---|---|
| ein | string | yes | Employer Identification Number, 9 digits, with or without the dash (12-3456789) |
No output schema declared.
No examples provided.
explain_irs_reject_code Explain an IRS e-file reject code ~87
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.
| Name | Type | Req | Description |
|---|---|---|---|
| code | string | yes | Reject code, e.g. R0000-922-01 |
No output schema declared.
No examples provided.
get_filing_due_date Form 990 due date ~173
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.
| Name | Type | Req | Description |
|---|---|---|---|
| ein | string | – | Employer Identification Number, 9 digits, with or without the dash (12-3456789) |
| fiscal_year_end_month | integer | – | Month the accounting year ends, 1-12 (12 = December 31) |
| form | string | – | Default 990-N |
| tax_year | integer | – | – |
No output schema declared.
No examples provided.
get_nonprofit_profile Get a nonprofit profile ~171
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).
| Name | Type | Req | Description |
|---|---|---|---|
| ein | string | yes | Employer Identification Number, 9 digits, with or without the dash (12-3456789) |
| include | array | – | Extra sections to return; leave out for the compact profile |
No output schema declared.
No examples provided.
get_nonprofit_stats US nonprofit statistics ~130
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.
| Name | Type | Req | Description |
|---|---|---|---|
| ntee_major | string | – | With scope "ntee": NTEE major group letter, e.g. B (education) |
| scope | string | yes | – |
| state | string | – | With scope "state" |
No output schema declared.
No examples provided.
get_top_nonprofits Nonprofit rankings ~87
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.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Default 10 |
| list | string | yes | – |
| state | string | – | Two-letter US state or territory code, e.g. TX |
No output schema declared.
No examples provided.
search_nonprofits Search US nonprofits ~108
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.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum results, 1-10 (default 5) |
| query | string | yes | Organization name (or part of it) or EIN |
| state | string | – | Two-letter US state or territory code, e.g. TX |
No output schema declared.
No examples provided.
which_990_form Which Form 990 an organization files ~212
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.
| Name | Type | Req | Description |
|---|---|---|---|
| ein | string | – | Employer Identification Number, 9 digits, with or without the dash (12-3456789) |
| gross_receipts | number | – | Gross receipts, normally the 3-year average for organizations 3+ years old, in USD |
| is_509a3_supporting_org | boolean | – | Supporting organization under section 509(a)(3) |
| is_church | boolean | – | Church, integrated auxiliary, or convention or association of churches |
| is_private_foundation | boolean | – | – |
| total_assets | number | – | Total assets at year end, in USD |
No output schema declared.
No examples provided.
How do I install the 990.tax nonprofit lookup MCP server?
990.tax nonprofit lookup is a hosted endpoint at https://990.tax/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · 990.tax
claude mcp add --transport http tax-990-nonprofit-lookup 'https://990.tax/mcp'
What is the 990.tax nonprofit lookup MCP server?
990.tax nonprofit lookup is an MCP server listed in the public MCP registry as tax.990/nonprofit-lookup. IRS records on US nonprofits: exempt status, revocations, Form 990 financials, due dates, stats. This page covers its hosted endpoint (https://990.tax/mcp).
Is the 990.tax nonprofit lookup MCP server safe to use?
990.tax nonprofit lookup scores 70 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the 990.tax nonprofit lookup MCP server expose?
990.tax nonprofit lookup exposes 8 tools: search_nonprofits, get_nonprofit_profile, check_exempt_status, which_990_form, get_filing_due_date, and 3 more. Their descriptions and schemas cost roughly 1,055 tokens of context every time the server is loaded.
Does the 990.tax nonprofit lookup MCP server require authentication?
No. We connected to 990.tax nonprofit lookup without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the 990.tax nonprofit lookup MCP server still maintained?
990.tax nonprofit lookup is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.