Which of the following expressions is key for subtracting from NOI to calculate pre-tax cash flow?

The expression that is key for subtracting from Net Operating Income (NOI) to calculate pre-tax cash flow is the debt equation. This is because pre-tax cash flow represents the cash that remains after accounting for important financial obligations, particularly any debt service that must be paid on a property.

When calculating pre-tax cash flow, it is essential to subtract not just the operational costs covered in NOI but also any required payments towards principal and interest on debt. This allows for a realistic assessment of the cash flow that is available to the property owner or investor after covering these key financial responsibilities.

In understanding the various terms, the debt equation incorporates both the interest and principal components that need to be serviced. Therefore, accurately factoring in this equation is crucial for determining the true cash flow available before taxes are applied, making it an essential component in evaluations of property performance and investment decisions.