Types | Oct 15, 2025

Interest-Only Mortgages: How They Work

Types

Interest-only mortgages allow borrowers to pay only the interest on the loan principal for a set initial period, typically 5 to 10 years. During this interest-only phase, monthly payments are lower than they would be for a standard amortizing loan where payments cover both principal and interest.

Key Features and Functionality

  1. Monthly Payments: During the interest-only period, payments consist solely of interest charges calculated on the remaining balance. This does not reduce the loan principal.

  2. Transition to Amortizing Payments: Once the interest-only period ends, the borrower must begin repaying both principal and interest. This can significantly increase monthly payments unless the borrower refinances the mortgage.

  3. Loan Term: Most interest-only mortgages have terms similar to standard mortgages, often 30 years in total, with the initial interest-only period followed by a typical amortizing schedule.

Eligibility Requirements

  • Credit Score: Borrowers usually need a higher credit score, often above 700, to qualify for an interest-only mortgage due to the increased payment risk after the interest-only period.
  • Income Verification: Proof of strong, stable income is crucial, as lenders need assurance of the borrower’s ability to handle ballooning payments post-transition.
  • Down Payment: A larger down payment, generally around 20% or more, might be required for securing favorable interest rates and terms.

Considerations Before Choosing an Interest-Only Mortgage

  • Payment Shock: Be prepared for how the mortgage payment will increase significantly once the interest-only period ends.
  • Equity Building: This mortgage type doesn’t build home equity during the interest-only period since payments are not reducing the principal.
  • Market Dependency: Consider future interest rate trends and property values, as these can affect refinancing options or selling property.

Interest-only mortgages may suit certain homeowners looking to maximize cash flow temporarily, but they require careful financial planning and consideration of future payment obligations. It’s advisable to assess your financial stability and long-term goals thoroughly before choosing this type of mortgage.