New investment models have been developed to mimic real investment conditions, considering payments of tax and interest multiple times a year. These models help assess the effectiveness of a company's investment program and strategy accurately. By analyzing four investment models, it was found that more frequent payments of tax and interest can either decrease or increase the project's value, depending on whether it is for equity owners or both equity and debt owners. For equity owners, annual payments are better, while for both equity and debt owners, more frequent payments lead to higher project value. These findings can help companies make better decisions about their investments and strategies.