Loan Constant

The loan constant is the annual debt service (principal plus interest) divided by the loan balance, expressed as a percentage — a useful comparison metric across loans with different rates and amortizations.

What it means

Loan Constant = Annual Debt Service ÷ Loan Amount. A 30-year fixed at 7% has a loan constant of about 7.98%. A 25-year fixed at 6.5% has a loan constant of about 8.10%.

The loan constant makes it easy to compare loan offers that differ in amortization and rate. It also feeds directly into the DSCR and cash-on-cash calculations when underwriting leverage.

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