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Enrolled Agent tax tools: IRS notices, FBAR, LLC vs S-Corp, quarterly estimates & more.
About
Enrolled Agent tax tools: IRS notices, FBAR, LLC vs S-Corp, quarterly estimates & more.
Remote endpoints: streamable-http: https://mcp.arcandledger.com/mcp
Security Report
5.2
Moderate5.2Moderate RiskThis is a well-structured, stateless MCP server providing tax calculation tools via Cloudflare Workers. The server has no authentication (by design, as a public service) but implements appropriate rate limiting, input validation via Zod schemas, and comprehensive test coverage. Permissions are well-scoped to HTTP networking and environment variables for rate-limiting configuration, which aligns with the stated purpose. Minor code quality observations exist but do not present security risks. Supply chain analysis found 4 known vulnerabilities in dependencies (2 critical, 2 high severity).
4 files analyzed · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
Arc & Ledger Tax Tools - MCP server
A public, no-auth remote MCP server that exposes Arc & Ledger's free tax calculators and intake funnel as tools inside AI assistants (Claude, ChatGPT). Runs as a stateless Cloudflare Worker; nothing is filed, purchased, or stored.
- Endpoint:
https://mcp.arcandledger.com/mcp(Streamable HTTP) - Docs: https://www.arcandledger.com/mcp
- Privacy: https://www.arcandledger.com/mcp/privacy
Tools
| Tool | Purpose |
|---|---|
decode_irs_notice | Explain an IRS notice, its deadline, and what to do. |
check_fbar_fatca | FBAR / Form 8938 obligations, thresholds, catch-up. |
compare_llc_scorp | SE tax vs salary+distribution, CA franchise, break-even. |
estimate_quarterly_taxes | Federal + CA quarterly estimates with safe harbor. |
estimate_rental_income | Net rental income, depreciation, passive-loss allowance, 14-day rule. |
deadline_calendar | US filing deadlines + penalties for founders (1120/5472, 1040-NR, FBAR, BOI). |
check_itin_eligibility | ITIN eligibility, W-7 category, documents; Enrolled Agent prepares the W-7 and represents you. |
estimate_irs_penalty | Failure-to-file / failure-to-pay penalties + interest on a balance; abatement. |
compare_formation_states | Wyoming vs New Mexico vs Delaware vs California for a US LLC. |
check_sales_tax_nexus | Economic + physical (FBA) sales-tax nexus by state. |
get_fee_quote | Published fee range and line items for firm services. |
book_consultation | First-party booking link + office identity. |
Plus five prompts (three English, two Turkish for founders):
decode_my_irs_notice, am_i_required_to_file_fbar, should_i_be_an_scorp,
abd_sirket_vergi_takvimi, itin_almali_miyim.
And four read-only resources (arcledger://office, arcledger://services,
arcledger://fee-catalog, arcledger://tool-directory) so an assistant can
cite the firm's identity, service directory, and fee catalog directly.
Design
- Stateless Streamable-HTTP JSON-RPC handler (no sessions, no Durable
Objects). Uses the official
@modelcontextprotocol/sdktypes +zod. - No hardcoded prices or rates.
src/pricing.tsre-exports the website'ssrc/data/pricing.ts;src/rates.tsre-exportssrc/config/taxConstants2026.tsand adds only genuinely-new pieces (safe harbor, CA S-corp rate, Form 8938 matrix, CA 30/40/0/30). Both are the single sources of truth. - Shared response envelope: every tool returns the same
disclaimer, a first-partysource_url, and one first-partynext_stephandoff. - Privacy: inputs processed in memory; logs carry only tool name, timestamp, and coarse enums (never free text or dollar amounts). 30-day retention.
- Rate limiting: per-IP token bucket (60/min, burst 10) + the native
RATE_LIMITERbinding when bound.
Commands
npm install
npm test # 47 tests: protocol, HTTP surface, tool correctness, drift guard
npm run typecheck
npm run dev # wrangler dev (local)
npm run deploy # wrangler deploy (needs the Cloudflare account)
npm run gen:products # regenerate ../public/feeds/products.json from pricing.ts
node scripts/gen-examples.mjs # regenerate docs/worked-examples.json
Layout
src/
index.ts Worker entry: /mcp, /healthz, /version, CORS, rate limit
registry.ts The 6 tools + 3 prompts
pricing.ts Adapter -> website pricing.ts (SSOT for prices)
rates.ts Adapter -> taxConstants2026.ts + server-only tax constants
lib/ mcp (protocol), response, logging, rateLimit, tax, dates, schemas
tools/ one file per tool
data/notices.ts IRS notice registry
submissions/ Anthropic + OpenAI payloads + listing copy
assets/ logo, favicon, response screenshots + paired prompts
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