Which field type should be used to store financial data related to invoicing in data extensions?

The appropriate field type for storing financial data related to invoicing in data extensions is currency. This field type is specifically designed to handle monetary values, allowing for proper formatting and calculations necessary for financial applications. It typically supports a fixed number of decimal places and represents currencies accurately, which is crucial when managing financial transactions to avoid errors in representation and calculations.

While decimal, number, and float can store numerical values, they lack specific features that make currency more suitable for financial data. Decimal might seem like a close alternative for handling precise numerical values, but it doesn't inherently include the formatting and characteristics tailored for currency, such as managing different currency symbols or currency-specific calculations. This makes currency the optimal choice for invoicing data, ensuring clarity, precision, and appropriate handling of financial figures.