The most cost-effective and quickly implementable solution for calculating tax rates based on locality and region would be to check AppSource for a tax add-on. AppSource is a marketplace provided by Microsoft where you can find and deploy various third-party tax calculation add-ons that are specifically designed for this purpose. These add-ons can be easily integrated into existing systems like Dynamics 365 Finance, saving considerable time and development effort compared to creating custom solutions or maintaining tax tables manually.
The Microsoft Power Platform consists of Power Apps, Power Automate, and Power BI. Power Apps is a suite of apps, services, and connectors, as well as a data platform, that provides a rapid application development environment to build custom apps for your business needs. Power Automate, formerly known as Microsoft Flow, allows users to create automated workflows between applications and services to synchronize files, get notifications, collect data, and more. Power BI is a business analytics service that delivers insights to enable fast, informed decisions. These three products are integral components of the Power Platform and work together to empower users to analyze data, build solutions, automate processes, and create virtual agents. Azure Active Directory and Azure Machine Learning are not part of the Power Platform.