Research on budget simulation calculation model under changing business environment

In the ever-changing international economic situation, companies must cope with multiple challenges including the instability of market demand, fluctuations in resource costs, and continuous changes in policies and regulations. This study is committed to developing and verifying a simulation budget forecasting model that can adapt to the ever-changing business environment of enterprises, with the aim of assisting companies in the scientific formulation of budget strategies. With the help of mathematical models, this study incorporates stochastic differential equations into it, deeply simulates the uncertainty of market demand and cost, and discusses its application effect in the real business environment in detail. The experimental output shows that the constructed model has a very small average error value in estimating sales revenue and expenditure, and it can accurately map the actual business operation status. The budget simulation model not only improves the accuracy of budget forecasting, but also enhances the ability of enterprises to adapt to market changes. In a changing business environment, the model effectively assists enterprises in financial management and decision-making.