Arc & Ledger Tax Reference is answering right now. Last checked 15 min ago. It exposes 13 tools. Last commit 31 Jul 2026.
Read-only US tax reference for notices, deadlines, filing screens, and clearly labeled estimates.
Uptime history
48 days of history
48 days agonow
100.0%
Uptime 24h
91 of 91 checks
13
Tools
read from the server
169 ms
Response time
average over 24h
0
Stars
last commit 31 Jul 2026
What changed 11
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 10 August 2026. No other catalogue keeps this.
15 Sep
a tool changed version
14 Sep
a tool changed version
12 Sep
a tool changed version
11 Sep
a tool changed version
8 Sep
a tool changed version2 times that day
7 Sep
a tool changed version
31 Aug
a tool changed version
27 Aug
a tool changed version
24 Aug
a tool changed version
10 Aug
a tool changed version
and 1 more, back to 10 August 2026
Nothing serious here today
Today is the operative word: we check Arc & Ledger Tax Reference every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.
run in your terminal
claude mcp add tax-tools --transport http https://mcp.arcandledger.com/directory/mcp~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"tax-tools": {
"url": "https://mcp.arcandledger.com/directory/mcp"
}
}
}~/.codex/config.toml
[mcp_servers.tax-tools]
url = "https://mcp.arcandledger.com/directory/mcp".cursor/mcp.json
{
"mcpServers": {
"tax-tools": {
"url": "https://mcp.arcandledger.com/directory/mcp"
}
}
}.vscode/mcp.json
{
"mcpServers": {
"tax-tools": {
"url": "https://mcp.arcandledger.com/directory/mcp"
}
}
}Available tools 13
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
estimate
estimate_accountable_plan
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_rule
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_penalty
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_taxes
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_income
Use to estimate a basic rental-income result from nonidentifying figures and identify the modeled depreciation, passive-loss, and personal-use limitations.
5472
check_5472_obligation
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.
deadline
deadline_calendar
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
decode_irs_notice
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.
explain
explain_tax_document
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.
fbar
check_fbar_fatca
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.
itin
check_itin_eligibility
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.
resolution
check_resolution_options
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.
treaty
check_treaty_withholding
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.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://mcp.arcandledger.com/directory/mcp | streamable-http | answering | 80 ms | 15 min ago |
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Arc & Ledger Tax Reference — questions
Answers built from our own checks of this server.
What can Arc & Ledger Tax Reference do?
It exposes 13 tools, read directly from the server on our last check. Among them: check_5472_obligation, check_fbar_fatca, check_itin_eligibility, check_resolution_options, check_treaty_withholding, deadline_calendar and 7 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 Arc & Ledger Tax Reference 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 169 ms. The bar chart above shows every period we have measured.
How do I connect Arc & Ledger Tax Reference?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Arc & Ledger Tax Reference need an API key?
No. Arc & Ledger Tax Reference completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Arc & Ledger Tax Reference?
It answers our handshake in 169 ms on average, which is faster than 73% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Arc & Ledger Tax Reference open source?
We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.