A system and method for forecasting tax effects of financial transactions is provided. The system and method include a series of web pages. The web pages allow a user to 1) determine their federal and state tax rates, 2) describe the asset they wish to sell. Additional web pages then display the tax consequences of the sale of the asset along with the details of the calculations used to evaluate those consequences. Still more web pages can be used to describe an asset to buy. In this case, the displayed consequences are expanded to compare the benefit of holding the current asset against the benefit of acquiring the new asset.