Dividend Calculator

The Dividend Calculator is a free online tool that instantly computes annual, monthly, and daily dividend income — both before and after tax — from your investment amount and dividend yield. It fully supports Japanese securities account tax classifications: NISA (completely tax-exempt), Tokutei/Specified (20.315% withholding), and Ippan/General (same 20.315% combined rate of 15.315% income tax + 5% resident tax).

Enable the DRIP (Dividend Reinvestment Plan) mode to simulate the powerful effect of compounding by reinvesting all dividends over time, with a year-by-year breakdown of principal, earned dividends, and cumulative dividends across up to 30 years. Perfect for evaluating high-dividend stocks, comparing index fund distributions, and assessing the tax-free benefits of NISA accounts. Ideal for retirement planning, passive income estimation, and making informed investment decisions. All processing runs entirely in your browser with no financial data ever transmitted externally — your investment information remains completely private and secure.