Free financial calculators for founders

Seven free, no-login calculators covering QSBS, exit take-home, dilution, ISO/AMT exercise, capital gains, 83(b) election, and secondary sales. Each calculator returns a plain-English result and a breakdown you can share with your CPA.

• QSBS Calculator — Free QSBS calculator. Estimate the federal capital gains excluded under IRC §1202 from your acquisition date, cost basis, holding period, and state.
• Exit Take-Home Calculator — Estimate what you actually keep from an acquisition or IPO after liquidation preferences, transaction costs, escrow, QSBS, and federal + state tax.
• Dilution Calculator — Model founder dilution across priced rounds. Add raise, pre-money valuation, and option pool top-up to see ownership % and implied value.
• Option Exercise and AMT Calculator — Estimate AMT on ISO exercise and the AMT crossover — the max shares you can exercise this year AMT-free. Supports ISOs and NSOs, all 50 states.
• Capital Gains Tax Calculator — Estimate federal and state capital gains tax on a stock sale, including NIIT. Compares short-term vs long-term treatment from your holding period.
• 83(b) Election Calculator — Compare tax outcomes with and without an 83(b) election on restricted stock across the vesting schedule. Includes the 30-day IRS filing deadline note.
• Secondary Sale Calculator — Estimate proceeds and tax on a private secondary sale, including QSBS exclusion, NIIT, state tax, and a transfer-restriction check for company ROFR.