Debt Amortization

Measured as

Ending balance = beginning balance - principal payments

Misused when

• Confusing amortization with interest-only periods.
• Ignoring prepayment penalties when accelerating principal.
• Mixing accounting amortization with actual cash repayments.

Operator takeaway

• Amortization reduces interest expense over time as the balance falls.
• Model amortization explicitly in cash forecasts and covenants.
• Separate principal from interest to avoid overstating operating expense.
• Tie Debt Amortization to the same balance-sheet date, scenario, and decision memo you are using elsewhere in the model.
• Document which claims, costs, or adjustments your team includes before comparing numbers across forecasts, covenants, or valuation work.

Next decision

• Read Loan amortization: how monthly payments and total interest work if the decision depends on interpretation, policy, or trade-offs beyond the raw formula.
• Decide whether Debt Amortization belongs in cash planning, valuation, or debt monitoring so the number is used in the right model.