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Arc & Ledger Tax Reference MCP server

online · 100% uptime
by arcandledger.com·com.arcandledger/tax-tools·v0.15.1
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Read-only US tax reference for notices, deadlines, filing screens, and clearly labeled estimates.

A85/100grade A
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A85/100

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Arc & Ledger Tax Reference tools (13)

write = sends, deletes, buys or posts
  • check_5472_obligationFree

    Use to screen common Form 5472 triggers for a foreign-owned US disregarded entity or corporation. The result is a general filing screen and does not prepare or file the form.

  • check_fbar_fatcaFree

    Use to screen general FBAR and Form 8938 thresholds from aggregate balance, filing status, residence, and account-count facts. Do not request account numbers, institution names, or statements.

  • check_itin_eligibilityFree

    Use to screen general ITIN reason categories, whether a return is commonly attached, and supporting-document requirements. Never request or process an actual ITIN, passport, or identity document.

  • check_resolution_optionsFree

    Use to screen general IRS payment and collection alternatives from a rough balance, filing-compliance status, ability-to-pay category, and coarse tax-account type when known. This is an educational fit screen, not a promise that the IRS will approve an option.

  • check_treaty_withholdingFree

    Use to explain general US withholding rules, documentation, and supported US-Turkey treaty rates for a payment category. Treaty eligibility and source rules depend on the full facts.

  • deadline_calendarFree

    Use to return common federal filing and payment dates for a selected filer or entity type. The user must verify the date for weekends, holidays, extensions, fiscal years, and special facts.

  • decode_irs_noticeFree

    Use when a user provides the code from an IRS notice or letter and wants a general explanation, the usual response window, or the next procedural step. Do not request the notice itself or any taxpayer identifier.

  • estimate_accountable_planFree

    Use to estimate potentially reimbursable business expenses under an accountable-plan scenario, including the split 2026 business-mileage rates. The result does not establish a plan or determine substantiation.

  • estimate_augusta_ruleFree

    Use to screen the fewer-than-15-days home-rental rule under IRC 280A(g) and calculate conditional amounts. Keep the owner-side income exclusion separate from the business-side requirements for ordinary and necessary use and reasonable rent.

  • estimate_irs_penaltyFree

    Use to estimate selected federal failure-to-file, failure-to-pay, and underpayment amounts from nonidentifying figures. The result is an estimate and does not replace an IRS account transcript.

  • estimate_quarterly_taxesFree

    Use to estimate federal quarterly tax payments from nonidentifying income, entity, withholding, and prior-year tax figures. Return the assumptions, safe-harbor context, and due dates.

  • estimate_rental_incomeFree

    Use to estimate a basic rental-income result from nonidentifying figures and identify the modeled depreciation, passive-loss, and personal-use limitations.

  • explain_tax_documentFree

    Use when a user names a US tax form or information document and wants to understand its purpose, common fields, or usual return treatment. Do not request or accept the document itself.

Public scan report

scanner v0.1.9 · 2026-09-24 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 684ms20/20
  • Tool poisoning13 tool descriptions checked15/15
  • Auth qualityopen endpoint, read-only tools10/15
  • Maintenancelast push 56 days ago12/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10
Overall 85/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Arc & Ledger Tax Reference compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
85/100
higher than 70% of 48,255 servers
Tools
13
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
140 ms
faster than 75% of 30,031 servers

What its tools let an agent do: 13 read

Install Arc & Ledger Tax Reference in Claude Code, Cursor or VS Code

claude mcp add --transport http tax-tools https://mcp.arcandledger.com/directory/mcp
Add to Cursor

What the publisher says

From the Arc & Ledger Tax Reference repository's README, as published. We do not edit it. Read it on GitHub

Arc & Ledger Tax Help MCP server

A public remote Model Context Protocol server for general US tax information, screening tools, estimates, and firm-specific service tools. It runs as a stateless Cloudflare Worker and requires no Arc & Ledger account or authentication.

The project exposes two surfaces:

  • Complete docs: https://www.arcandledger.com/mcp/
  • Directory docs: https://www.arcandledger.com/mcp/directory/
  • MCP privacy policy: https://www.arcandledger.com/mcp/privacy/
  • Support: https://www.arcandledger.com/mcp/support/

Every result is general information, not tax advice, and creates no practitioner-client relationship. The tools do not file, transmit, sign, certify, authorize payment, or access a taxpayer account.

Connect

No API key, OAuth flow, or Arc & Ledger account is required. For the reviewed educational surface, use:

https://mcp.arcandledger.com/directory/mcp

For local Claude Code testing:

claude mcp add --transport http arc-ledger-tax-reference https://mcp.arcandledger.com/directory/mcp

The complete endpoint remains available to users who intentionally want the firm-specific public tools documented on the main MCP page.

Directory tool set

The directory edition is the surface proposed for the OpenAI Plugins Directory and Anthropic Software Directory.

Each directory result:

  • cites an official IRS or FinCEN page;
  • includes a shared general-information limitation;
  • tells the calling model to preserve exact returned figures and dates;
  • contains no Arc & Ledger service, contact, booking, payment, or upload link.

The directory edition intentionally excludes firm quotations, consultations, document collection, service matching, formation-state comparisons, sales-tax nexus screens, and reasonable-compensation ranges. Those tools either have a commercial purpose, rely on changing state data, or need more professional judgment than a short deterministic screen should imply.

Privacy and safety

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Arc & Ledger Tax Reference: common questions

Is Arc & Ledger Tax Reference MCP server safe?
Yes, by our scan: it is graded A (85/100). Read the Arc & Ledger Tax Reference safety report
How do I install Arc & Ledger Tax Reference?
It runs remotely at mcp.arcandledger.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Arc & Ledger Tax Reference need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Arc & Ledger Tax Reference maintained?
The last commit was 96 days ago (2026-07-31). The latest release is v0.15.1.
Is Arc & Ledger Tax Reference up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does Arc & Ledger Tax Reference compare with other MCP servers?
safety score 85/100 (higher than 70% of 48,255 servers); tools 13 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.