Acorn9
Insights

Startup tax, explained.

Tax, accounting, and fundraising — from an AI-native tax & accounting firm built for startups.

Tax

The First-Year Startup Tax Checklist (2026)

Every federal and state tax task a new startup owes in year one: EIN, the S-election clock, your first return, payroll, and why domestic firms skip BOI.

Acorn 9 team
Fundraising

Burn Rate and Runway: A Founder's Primer

What burn rate and runway actually mean, how to calculate them, and the runway investors expect at each stage — with an interactive calculator.

Acorn 9 team