# 990.tax nonprofit lookup (remote · 990.tax)

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

- Trust score: 70/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-04

## Components

- remote · `990.tax`: 70/100 (this document), [markdown](https://verifymcp.io/servers/tax-990-nonprofit-lookup/990.md), [page](https://verifymcp.io/servers/tax-990-nonprofit-lookup/990)

## Channel facts

- Endpoint: `https://990.tax/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-04.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 67/100
  - AI-judged instruction clarity (good).
  - 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.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 94/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 83% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### 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.

### Claude

```bash
claude mcp add --transport http tax-990-nonprofit-lookup 'https://990.tax/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "tax-990-nonprofit-lookup": {
      "url": "https://990.tax/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tax-990-nonprofit-lookup": {
      "type": "http",
      "url": "https://990.tax/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.tax-990-nonprofit-lookup]
url = "https://990.tax/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tax-990-nonprofit-lookup": {
      "type": "remote",
      "url": "https://990.tax/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tax-990-nonprofit-lookup --url 'https://990.tax/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  tax-990-nonprofit-lookup:
    url: "https://990.tax/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "tax-990-nonprofit-lookup": {
      "Transport": "http",
      "Url": "https://990.tax/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add tax-990-nonprofit-lookup -t streamable-http -u 'https://990.tax/mcp'
```

### Other

```json
{
  "mcpServers": {
    "tax-990-nonprofit-lookup": {
      "type": "http",
      "url": "https://990.tax/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 70, +1)

- [security] 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
- [functional improvement] Stability: unverified → 0.03

### 2026-11-03 (score 69)

First indexed and scored.

## MCP tools (8)

### `search_nonprofits` (~108 tokens)

Search US 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.

Input parameters:

- `limit` (integer): Maximum results, 1-10 (default 5)
- `query` (string, required): Organization name (or part of it) or EIN
- `state` (string): Two-letter US state or territory code, e.g. TX

### `get_nonprofit_profile` (~171 tokens)

Get a 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).

Input parameters:

- `ein` (string, required): Employer Identification Number, 9 digits, with or without the dash (12-3456789)
- `include` (array): Extra sections to return; leave out for the compact profile

### `check_exempt_status` (~87 tokens)

Check tax-exempt status and missing years

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)).

Input parameters:

- `ein` (string, required): Employer Identification Number, 9 digits, with or without the dash (12-3456789)

### `which_990_form` (~212 tokens)

Which Form 990 an organization files

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.

Input parameters:

- `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

### `get_filing_due_date` (~173 tokens)

Form 990 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.

Input parameters:

- `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)

### `get_nonprofit_stats` (~130 tokens)

US nonprofit statistics

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.

Input parameters:

- `ntee_major` (string): With scope "ntee": NTEE major group letter, e.g. B (education)
- `scope` (string, required)
- `state` (string): With scope "state"

### `get_top_nonprofits` (~87 tokens)

Nonprofit rankings

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.

Input parameters:

- `limit` (integer): Default 10
- `list` (string, required)
- `state` (string): Two-letter US state or territory code, e.g. TX

### `explain_irs_reject_code` (~87 tokens)

Explain an IRS e-file 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.

Input parameters:

- `code` (string, required): Reject code, e.g. R0000-922-01

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/tax-990-nonprofit-lookup/990#diagnostics

## Score history

- 2026-11-04: 70
- 2026-11-03: 69

## Common questions

### 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.

## Links

- Remote endpoint: https://990.tax/mcp
- Website: https://990.tax/mcp
- Changelog RSS feed: https://verifymcp.io/servers/tax-990-nonprofit-lookup/990.xml
- Changelog JSON feed: https://verifymcp.io/servers/tax-990-nonprofit-lookup/990.json
- HTML version of this page: https://verifymcp.io/servers/tax-990-nonprofit-lookup/990