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What Is an Interest-Only Mortgage?

An interest-only mortgage is a type of home loan where the borrower is only required to pay the interest on the principal balance for a set period of time, typically during the initial years of the loan term. This differs from a traditional mortgage where the borrower makes regular monthly payments that cover both the interest and principal balance of the loan.

Interest-only mortgages can be attractive to borrowers because they generally offer lower monthly payments during the interest-only period. However, these loans carry unique risks and may not be the ideal choice for everyone. In this article, we'll outline the key features of interest-only mortgages, discuss their pros and cons, and provide tips on how to evaluate if an interest-only mortgage is right for you.

Key Features of Interest-Only Mortgages

Interest-only payment period: The defining feature of an interest-only mortgage is the initial period during which the borrower is only required to pay the interest on the principal balance of the loan. This period can vary in length but typically lasts for 5, 7, or 10 years. After the interest-only payment period ends, the borrower must begin making payments towards the principal balance.

Adjustable interest rates: Many interest-only mortgages feature adjustable interest rates, meaning the rate can change over time based on market conditions. These loans often have an initial fixed-rate period (usually during the interest-only period), followed by variable rates tied to a benchmark index, such as the London Interbank Offered Rate (LIBOR) or the U.S. Prime Rate.

Amortization schedule and payment changes: Once the interest-only period ends, the loan amortizes over the remaining term. This means that the monthly payments will increase significantly as they now include both interest and principal payments. Borrowers should be aware of these payment changes and ensure they can handle the higher mortgage payment once the interest-only period expires.

Pros of Interest-Only Mortgages

  • Lower initial monthly payments: One of the primary advantages of interest-only mortgages is the lower monthly payments during the interest-only period. Since you are only paying interest, your payments are considerably lower than they would be if you were paying both principal and interest. This can free up cash flow for other expenses, including home improvements or investing in other assets.
  • Greater payment flexibility: Interest-only mortgages give borrowers more payment flexibility during the interest-only period, as they can choose to make additional payments towards the principal balance of the loan if they have extra funds available. This allows borrowers to have control over their payments and make larger contributions when it's financially feasible.
  • Tax advantages: In some cases, borrowers may be able to deduct the full amount of their interest-only mortgage payments on their income taxes, depending on the specific terms of their loan and personal tax situation. This tax benefit can provide an additional financial incentive for choosing an interest-only mortgage.

Cons of Interest-Only Mortgages

  • Higher overall interest costs: Although interest-only mortgages offer lower initial payments, borrowers typically pay more interest over the life of the loan compared to a traditional mortgage. Since the principal balance does not decrease during the interest-only period, borrowers are essentially postponing principal payments and will pay interest on a larger balance for a longer period.
  • Payment shock: As mentioned earlier, once the interest-only period ends, your monthly mortgage payment will increase significantly as you start paying both principal and interest. This increased payment is often referred to as "payment shock" and may lead to financial strain if you are not prepared for the change.
  • Risk of negative amortization: In some cases, an interest-only mortgage may be negatively amortizing, meaning the monthly payment does not cover the full amount of interest accrued during that period. In these cases, the unpaid interest is added back to the principal balance, causing the total loan amount to increase rather than decrease. This can lead to a challenging financial situation where you owe more on the mortgage than the home is actually worth.
  • Limited home equity growth: By not paying down the principal balance during the interest-only period, your home equity will only increase through appreciation in the property's value. This can limit your financial flexibility if you need to tap into your home equity, through a home equity loan or line of credit, or if you plan to sell the home in the future.

Who Should Consider an Interest-Only Mortgage?

Interest-only mortgages are not suitable for every borrower due to the added risks and potential for increased overall costs. However, for certain individuals, these loans might make sense. Here are some situations in which an interest-only mortgage might be appropriate:

  • Borrowers with irregular or fluctuating income: If your income varies month to month, perhaps due to self-employment or seasonal work, an interest-only mortgage can provide flexibility and lower initial monthly payments. This can be helpful during periods of lower income, and you can make additional principal payments during periods of higher income.
  • Investment property owners: If you're purchasing an investment property, an interest-only mortgage may allow you to minimize monthly expenses while you wait for the property's value to appreciate or for rental income to cover the higher payments when the interest-only period ends.
  • Financially disciplined borrowers: If you're confident that you can use the additional monthly cash flow provided by the lower interest-only payments to invest in assets with a higher potential return, an interest-only mortgage might be suitable. However, this approach requires discipline and a well-thought-out financial plan.

Tips to Evaluate If an Interest-Only Mortgage Is Right for You

Before you decide to apply for an interest-only mortgage, consider the following tips to help evaluate if this loan product is the right fit for your financial situation:

  • Assess your long-term financial goals: Consider your long-term financial objectives, such as saving for retirement, investing in your child's education, or purchasing additional properties. Determine if an interest-only mortgage helps you achieve these goals or whether it introduces unnecessary risk to your financial plan.
  • Understand the risks: Familiarize yourself with the potential pitfalls associated with interest-only mortgages, such as the risk of negative amortization, payment shock, and limited home equity growth. Ensure that you fully appreciate these risks before committing to an interest-only mortgage.
  • Prepare for payment changes: Be proactive in planning for the increase in monthly payments after the interest-only period ends. Make a realistic assessment of your future income and expenses, considering potential changes in your financial situation, such as job loss, salary increases, or changes in your family size.
  • Consult a financial professional: If you're unsure about whether an interest-only mortgage is the right choice for you, consider speaking with a financial advisor or mortgage professional. They can help you evaluate your specific financial situation and provide guidance on the best mortgage product for your needs.


Interest-only mortgages can be an attractive option for borrowers seeking lower initial monthly payments and increased payment flexibility. However, these loans come with inherent risks and trade-offs that need to be carefully considered. By understanding the key features, pros, and cons of interest-only mortgages, and evaluating your financial situation and goals, you will be better equipped to determine if an interest-only mortgage is the right choice for you.

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