Debt Coverage Ratio (DCR) or Debt Service Coverage Ratio (DSCR) is a widely used ratio in the case of buy-to-let property and in general income-producing property.

This is the case because the DCR ratio is one of the two critical indicators used by bank loan officers in evaluating mortgage loan requests by property investors. When evaluating a mortgage loan request, besides the debt coverage ratio, the other critical indicator used by bank loan officers is the Loan To Value (LTV) Ratio. The loan amount given needs to satisfy both criteria.
The Debt Coverage Ratio (DCR) is the ratio of the annual net operating income (NOI) over the annual debt service, or the annual mortgage payment in the case of real estate. For example, if the property has an annual NOI of $100,000 and a loan with an annual mortgage payment of 80,000, then the DCR will be:
DCR = Annual NOI / Annual Debt Service =100,000/80,000 =1.25
The calculated DCR of 1.25 implies that the property net operating income is 1.25 higher than the annual payment required to service the mortgage loan. If the debt coverage ratio is smaller than 1, it indicates that the property produces insufficient income to cover both operating expenses and the mortgage payment, which is what lenders want to avoid. Within this context, lenders are usually requiring a DCR of at least 1.2, which means that property net operating income needs to be at least 1.2 times higher than the mortgage payment.
The minimum DCR required by banks varies depending on prevailing local and global economic and real estate market conditions. In particular, in times of economic downturn and weak real estate markets during which there is increased risk that the NOI of the property may decline and the DCR fall below the minimum benchmark required by the bank to approve the loan, and even below 1, banks are requiring a higher DCR, so they are protected against future declines of NOI.
If the property has more than one mortgages then the debt service used to calculate this ratio will be the sum of the annual payments due for all loans.
Required DCR and Maximum Loan