iPlanner is a general planning and budgeting tool - a business simulator, which helps entrepreneurs to perceive better the functioning of his/her business. A Web-based application enables a small business manager to prepare rolling budgets, forecasts or a complete business plan. It is a novel Web-based software which helps a decision maker to foresee and play through what-if situations. iPlanner automatically generates solutions to expected economic performance, business value and financial results. The quality of decisions will improve, as the expected situations can be played through in the computer. Thanks to business simulation, the opportunities and objectives of the company become clearer and it is possible to prevent crises and avoid management errors. iPlanner shows what the cash flows, profitability and financial position of the company will be like in the future. It will be easy to determine additional financing needs, select timing for capital expenditures and plan the payment of dividends. The entrepreneur will learn about the business value of his or her company.