Arc & Ledger Tax Reference MCP Tools

Arc & Ledger Tax Reference exposes 13 tools. Each one has its own page with the configuration for every client that can run this server.

decode_irs_notice

decode irs notice
check_resolution_options Read-only

check resolution options
estimate_irs_penalty

estimate irs penalty
explain_tax_document

explain tax document
deadline_calendar

deadline calendar
check_fbar_fatca Read-only

check fbar fatca
check_treaty_withholding Read-only

check treaty withholding
check_itin_eligibility Read-only

check itin eligibility
check_5472_obligation Read-only

check 5472 obligation
estimate_quarterly_taxes

estimate quarterly taxes
estimate_accountable_plan

estimate accountable plan
estimate_augusta_rule

estimate augusta rule
estimate_rental_income

estimate rental income

This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what the server actually exposes, not what its listing claims.

Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.

Arc & Ledger Tax Reference MCP server