Firstbase

Incorporation, compliance, bookkeeping, and taxes for US startups — in one place.

launchedb2bpaidLegal & Finance / US incorporation & back office

About

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.

Key Features

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

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