Taxlocus
Query citation-backed US sales tax rates, economic nexus, product taxability, and filing obligations while building checkout or billing.
Overview
TaxLocus MCP is a MCP server for the Build phase that delivers citation-backed US sales tax rates, economic nexus, taxability, and filing data for AI agents.
What is this MCP server?
- API remote at https://api.taxlocus.com/mcp (streamable-http, schema 2025-09-29)
- US sales tax rates, economic nexus thresholds, taxability, and filing surfaced for agents
- Citation-backed answers intended for defensible agent and builder research
- GitHub data repo (Ringzero787/taxlocus-data) and website taxlocus.com documented
- Purpose-built for AI agents automating ecommerce and SaaS compliance questions
What problem does it solve?
Indie sellers hit contradictory blog posts on nexus and rates and cannot trust hallucinated tax answers while coding checkout logic.
Who is it for?
US-facing SaaS and ecommerce solos wiring tax behavior into billing, carts, or internal compliance bots.
Skip if: Personal income tax filing, non-US VAT-only shops with no US nexus, or teams that refuse remote finance APIs.
What do I get? / Deliverables
Agents pull TaxLocus-backed, cited sales tax facts into integration work so rate tables and nexus checks align with documented sources.
- Cited US sales tax rate and rule lookups via agent tools
- Nexus and taxability context for integration design docs
- Filing-oriented pointers aligned with TaxLocus data scope
Recommended MCP Servers
Journey fit
Sales tax logic is wired during Build integrations (Stripe, carts, invoicing) even though compliance continues in Operate. Integrations is the shelf for MCP servers that embed third-party tax APIs into agent-driven backend and billing work.
How it compares
Citation-backed US sales-tax MCP for builders, not personal TaxAct filing guidance MCP.
Common Questions / FAQ
Who is TaxLocus MCP for?
Developers and solo operators building US sales tax into products who want agents to use cited rate, nexus, and taxability data.
When should I use TaxLocus MCP?
Use it while integrating checkout, subscriptions, or marketplace payouts and again in Operate when revenue triggers new nexus review.
How do I add TaxLocus MCP to my agent?
Register https://api.taxlocus.com/mcp as a streamable-http MCP server in your agent client following Skillselion’s MCP server instructions.