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AI-powered. Human-reviewed. Built to scale.

Financial infrastructure
for growing companies.

Your wait is over. MainStreet.ai is the all-in-one fintech suite built for startups and small businesses.

Get started free Book a demo
Illustration of a MainStreet building connected to Entity Formation, Banking, R&D Tax Credits, Expense Tracking and Bookkeeping. Note reads: All the financial tools your business needs. In one place.

R&D Tax Credits

Turn innovation into capital.

  • Identify qualifying R&D expenses
  • Maximize eligible credits
  • IRS-compliant documentation
Check Eligibility
Total credits identified$174M+for our customers

Bookkeeping

Accurate books. Real insights.

  • AI-powered transaction matching
  • Monthly books in 1-2 days
  • CFO-ready financial statements
Bench My Books (opens in a new tab)
Customers report80% lesstime on bookkeeping

Entity Formation

Launch your business the right way.

  • Form in all 50 states
  • Compliant docs and EIN
  • Cap table ready from day one
Start Formation (opens in a new tab)
Businesses formed25,000+and countingTrusted by founders nationwide

Banking

Modern business banking, built for startups.

  • Multi-account management
  • Fast approvals & wires
  • FDIC insured up to $10M+
Open Account

Expense Tracking

Every dollar tracked. Zero guesswork.

  • Real-time receipt capture
  • Auto-categorization
  • Syncs to your books
Track Expenses (opens in a new tab)