What is the debt service coverage ratio?

it is the amount of cash flow available to meet annual interest and principal payments on debt.

In corporate finance, DSCR (debt service coverage ratio) is the amount of cash flow available to meet annual interest and principal payments on debt.
This ratio should ideally be over1.
In general, it is calculated by: Net Operating Income / total debt service

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the amount of cash available with the company annually to meet is debt obligations- interest and principal repayment