What Is an Offset Mortgage?

What Is an Offset Mortgage?

An offset mortgage combines traditional mortgage features with one or more deposit accounts at the same financial institution. This approach utilizes funds from the deposit accounts to reduce the mortgage balance, resulting in lower monthly payments. While offset mortgages are common in many countries, they are not currently allowed by U.S. tax laws. Choosing an offset mortgage as a repayment option is beneficial to borrowers because they can make smaller payments towards the principal rather than the interest.


In home financing, an offset mortgage combines a traditional mortgage with one or more deposit accounts from the same financial institution. This innovative approach empowers homeowners to leverage the savings balance in their deposit accounts to offset the mortgage balance, resulting in reduced interest payments.

While offset mortgages have become commonplace in numerous countries, including the U.K., they remain ineligible for implementation in the United States, primarily due to existing tax laws. The most analogous alternative available in the U.S. is represented by the all-in-one mortgage.

Exploring Offset Mortgage Dynamics

Offset mortgages present an appealing avenue for diligent savers seeking financial efficiency. While the linked savings account remains interest-free throughout the loan tenure, it is essential to note that most savings accounts typically yield a modest 1% to 3% per annum or less.

Given that mortgage interest rates tend to exceed those of savings accounts significantly, any savings accrued translate into a net advantage for the borrower. Furthermore, the forfeited interest on the savings account transforms into non-taxable payments contributing to the mortgage.

Typically non-interest bearing, the savings account enables the bank to generate a positive return on maintained balances. The interest calculation centers on the outstanding loan balance, deducting the cumulative savings across one or more deposit accounts. Despite continued access to the savings account, withdrawing funds results in a higher principal balance for subsequent mortgage payments. The flexibility of linking multiple savings accounts, including those of family members, to the offset mortgage further allows for a reduction in the principal amount, consequently minimizing interest on the remaining balance.

Offset Mortgage Illustration

Illustrating the application of an offset mortgage, the Smith family currently holds a principal amount of $225,000 with a 5% interest rate. Concurrently, they maintain a savings balance of $15,000 with the same lender, with no withdrawals in the past month. The calculation for the forthcoming interest payment on the offset loan involves deriving it from the reduced balance of $210,000, obtained by subtracting the savings account balance from the loan principal ($225,000 – $15,000 = $210,000).

Advantages of Utilizing an Offset Mortgage

Opting for an offset mortgage provides an enticing avenue for repaying a mortgage loan. The borrower can channel modest payments toward reducing the principal rather than servicing the interest. This strategic approach accelerates the reduction of the loan balance.

Simultaneously, since these payments contribute to the borrower's savings account, the borrower retains access to their funds if necessary. This flexibility encompasses the dual benefits of swift mortgage repayment and the advantages of accumulating savings in an investment account.


The offset mortgage concept intertwines traditional mortgage elements with deposit accounts, enabling borrowers to use these accounts to decrease the mortgage balance and consequently reduce monthly payments. While offset mortgages are prevalent globally, U.S. tax laws currently prohibit their implementation. Opting for an offset mortgage is advantageous for borrowers, allowing them to direct smaller payments towards the principal instead of interest, fostering efficient repayment and retaining flexibility. This financial strategy not only expedites mortgage reduction but also provides the dual benefits of swift repayment and savings accumulation in an investment account.

Offset Mortgage
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