What is the term for the total amount spent including tax?

The correct answer is the total cost calculation, as this term specifically refers to the complete amount incurred when making a purchase, which includes both the base price of the item and any applicable taxes. When evaluating costs associated with purchasing goods or services, it is crucial to consider the total cost because this reflects the true expenditure from the buyer's perspective.

In practical terms, when a consumer goes to buy a product, the price displayed typically does not include taxes. Therefore, the calculation of the total cost gives an accurate figure that allows individuals to understand what their total financial commitment will be at the time of purchase. By using this term, it encompasses not only the price that is initially set but also the additional financial obligation created by taxation.

While other options touch on aspects of financial calculations, they do not specifically address the inclusive nature of taxes when determining what is actually spent during a transaction.