Firstbase

Summary

Firstbase is a founder-focused platform for starting and running a US business from abroad or at home. It automates LLC and C-Corporation formation, then supports ongoing operations: registered agent and multi-state compliance (Agent), a premium US business address and virtual mailbox (Mailroom), accrual bookkeeping with books closed on a schedule (Accounting), and corporate or personal tax filing for US-based and international founders. Firstbase One bundles core back-office pieces so teams can replace a patchwork of vendors with one operating system from incorporation through tax season.

Use cases & highlights

• Form a US LLC or C-Corp with guided filings and onboarding support
• Stay on top of registered agent, annual reports, and franchise tax with compliance tooling
• Use a premium US business address and virtual mailbox for legal and banking correspondence
• Run accrual bookkeeping aimed at tax-ready, investor-ready financials
• File corporate and personal taxes with support for international founders
• Bundle Mailroom, Agent, Accounting, and tax filing with Firstbase One when you want one subscription