What is Constante del Préstamo?
Servicio de deuda anual (capital + intereses) expresado como porcentaje del monto original del préstamo, utilizado para evaluar rápidamente la viabilidad de un inmueble generador de ingresos.
Description
The loan constant (also called the mortgage constant) is the ratio of annual debt service to the total loan amount. It combines both principal repayment and interest into a single metric. For example, a AED 2M loan with annual payments of AED 160,000 has a loan constant of 8%. This metric is useful because if the property's cap rate exceeds the loan constant, the debt financing is positive, meaning borrowing enhances returns.
If a Dubai property has a 7% cap rate and the loan constant is 6%, the property earns more than its debt costs, positive debt financing. If the cap rate is 5% and the loan constant is 6%, the property cannot fully cover its debt service from NOI alone, requiring additional cash flow or capital from the investor.
Fórmula
Loan Constant = Annual Debt Service / Original Loan Amount × 100How to interpret
The loan constant is the most useful single number for quickly assessing whether a property can service its debt from operating income. Compare it directly to the cap rate: if the cap rate exceeds the loan constant, the investment has positive debt financing and the income covers debt service. If it falls short, additional cash contributions are needed to cover the gap.
Longer loan terms reduce the loan constant because a greater proportion of each payment is interest rather than principal, reducing the annual principal repayment burden. A 25-year mortgage has a lower loan constant than a 15-year mortgage at the same rate. This is why longer term mortgages generate better initial cash flow despite costing more in total interest.
Contexto del mercado de Dubái
UAE residential mortgages have maximum terms of 25 years, with most investors choosing 20-25 year terms to reduce monthly payments and loan constants. Commercial mortgages are typically shorter (5-10 years) with balloon payments, resulting in higher loan constants that require higher property yields to achieve positive debt financing.
Interest rate movements directly affect loan constants on variable-rate mortgages. The EIBOR increases of 2022-2023 raised loan constants notably for investors on variable rates, converting some previously positively levered investments to negative debt financing. Investors on fixed-rate periods were protected during this window, demonstrating the value of fixing rates when positive debt financing margins are narrow.
Frequently asked questions
The annual debt service (principal + interest) expressed as a percentage of the total original loan amount, used to quickly assess whether a property's income can support its financing.
The standard formula is: Loan Constant = Annual Debt Service / Original Loan Amount × 100. Applying it consistently lets you compare projects on a like-for-like basis, which is the point of the metric.
The loan constant is the most useful single number for quickly assessing whether a property can service its debt from operating income. Compare it directly to the cap rate: if the cap rate exceeds the loan constant, the investment has positive debt financing and the income covers debt service.
UAE residential mortgages have maximum terms of 25 years, with most investors choosing 20-25 year terms to reduce monthly payments and loan constants. Commercial mortgages are typically shorter (5-10 years) with balloon payments, resulting in higher loan constants that require higher property yields to achieve positive debt financing.
Oliva feeds Loan Constant into a proprietary 6-dimension score that rates eparticularly Dubai project on Financial Value, Market Dynamics, Location, Developer Trust, Risk, Macro Context, and Liquidity. This keeps comparisons consistent across hundreds of listings.
If a Dubai property has a 7% cap rate and the loan constant is 6%, the property earns more than its debt costs, positive debt financing. If the cap rate is 5% and the loan constant is 6%, the property cannot fully cover its debt service from NOI alone, requiring additional cash flow or capital from the investor.
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This content is for educational purposes only and does not constitute investment, financial, legal, or tax advice. Yields, returns, and market data referenced are historical or estimated and are not guaranteed. Capital is at risk. Seek independent professional advice before making investment decisions. Oliva is a licensed Dubai real estate advisor (DLD Broker Card: 92025, RERA BRN: 1573501). Read our Key Risks Disclosure and Disclaimer.