Arc & Ledger Tax Reference
Decode IRS notices, understand tax deadlines, estimate penalties, and explore payment options.
Read-only reference for US federal tax notices, filing deadlines, penalty estimates, and resolution options. Explains IRS forms, FBAR/FATCA rules, quarterly tax payments, and rental income calculations using nonidentifying figures only.
Try asking Muse: "I got an IRS notice CP2000 dated last month, what does it mean and when do I need to respond?"
Source: Found in the official MCP Registry (com.arcandledger/tax-tools) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 53 min ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://mcp.arcandledger.com/directory/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 213ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 13
decode_irs_noticeUse 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.check_resolution_optionsUse 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.estimate_irs_penaltyUse 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.explain_tax_documentUse 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.deadline_calendarUse 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.check_fbar_fatcaUse 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_treaty_withholdingUse 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.check_itin_eligibilityUse 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_5472_obligationUse 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.estimate_quarterly_taxesUse 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_accountable_planUse 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_ruleUse 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_rental_incomeUse to estimate a basic rental-income result from nonidentifying figures and identify the modeled depreciation, passive-loss, and personal-use limitations.Recent checks
Link
https://mcp.arcandledger.com/directory/mcpQuestions about Arc & Ledger Tax Reference in Muse
How do I connect Arc & Ledger Tax Reference to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Arc & Ledger Tax Reference to help me. It is a free service with an MCP server at https://mcp.arcandledger.com/directory/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is Arc & Ledger Tax Reference working right now?
At the last check (September 28, 2026, 08:15 UTC) the endpoint was working, answering in 213ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is Arc & Ledger Tax Reference safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can Arc & Ledger Tax Reference do in Muse?
It exposes 13 tools, including decode_irs_notice, check_resolution_options, estimate_irs_penalty, explain_tax_document. For example, you could ask Muse: "I got an IRS notice CP2000 dated last month, what does it mean and when do I need to respond?"
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