Real Estate Thinking

Debt Service

Debt service is a fixed obligation that must be paid whatever happens, so the coverage ratio (income ÷ debt payments) is the safety margin, and it reveals the fragility of any business with fixed costs.

  • Beginner
  • 9 min total
  • 12 chapters

What decision this helps you make: How to judge whether an asset's income can safely carry its debt, using the coverage ratio to insist on a real cushion, and applying the same lens to every fixed obligation.

What this topic is

Debt service is the total loan payments (principal + interest) required, and the debt service coverage ratio (NOI ÷ debt service) measures whether, and by how much, the asset's income covers them.

Why it matters

Debt payments are fixed while income is variable, so the coverage ratio is the safety margin: too thin, and a normal income dip means the loan can't be paid. That is the mechanism behind over-leverage failure.

Who should learn it

Anyone taking on debt or any fixed obligation: real estate investors, business borrowers, and operators with leases, contracts, or payroll to cover.

What you will understand

  • Debt service = the fixed loan payments (principal + interest)
  • DSCR = NOI ÷ debt service, the coverage / safety margin
  • Debt is fixed while income is variable, and the gap is the risk
  • Any fixed obligation needs a coverage cushion: the universal lesson

Prerequisites

Common misconception

"If the income covers the loan payments, the deal is safe." Barely covering the payments, at a coverage ratio near 1.0, is a knife-edge: any vacancy, repair, or slow month and the income no longer covers the fixed debt. Safety isn't covering the payments; it's covering them with a margin. The coverage ratio measures that margin, and a thin one is exactly how a deal that "worked on paper" fails when reality dips.