Tools
Practical tools for startup tax decisions.
We build calculators and references for the questions founders actually ask us — free, no email, no signup. Just the answer.
Startup tax calendar
Key federal and state tax deadlines for startups, in one place, with a downloadable calendar for Apple, Google, and Outlook.
International Tax Filing Checker
Find out which U.S. tax returns and international reporting forms may apply to your business, including foreign ownership, subsidiaries, and bank accounts.
Check my filing requirements Featured toolR&D tax credit calculator
Estimate your federal R&D credit based on employee wages, contractors, supplies, and cloud costs. Compare calculation methods and see whether your startup could use the credit against payroll taxes.
Estimate your credit Featured toolDelaware franchise tax calculator
Estimate Delaware franchise tax using both calculation methods — and understand why the amount on your Delaware notice may be much higher than what you ultimately owe.
Calculate your tax Calculator83(b) Election Calculator
Find your 30-day filing deadline, including weekends and holidays, and compare estimated taxes with and without the election.
Calculate your deadlineMore founder tax tools are coming. Have a calculation you wish existed? We build these from real client questions.
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