Repaying the mortgage

Foreign currency mortgage

In some countries with currencies that tend to depreciate, foreign currency mortgages are common, enabling lenders to lend in a stable foreign currency, whilst the borrower takes on the currency risk that the currency will depreciate and they will therefore need to convert higher amounts of the domestic currency to repay the loan.

Repaying the mortgage

In addition to the two standard means of setting the cost of a mortgage loan (fixed at a set interest rate for the term, or variable relative to market interest rates), there are variations in how that cost is paid, and how the loan itself is repaid. Repayment depends on locality, tax laws and prevailing culture. There are also various mortgage repayment structures to suit different types of borrower.

Capital and interest

The most common way to repay a loan is to make regular payments of the capital (also called the principal) and interest over a set term. This is commonly referred to as (self) amortization in the U.S. and as a repayment mortgage in the UK. A mortgage is a form of annuity (from the perspective of the lender), and the calculation of the periodic payments is based on the time value of money formulas. Certain details may be specific to different locations: interest may be calculated on the basis of a 360-day year, for example; interest may be compounded daily, yearly, or semi-annually; prepayment penalties may apply; and other factors. There may be legal restrictions on certain matters, and consumer protection laws may specify or prohibit certain practices.
Depending on the size of the loan and the prevailing practice in the country the term may be short (10 years) or long (50 years plus). In the UK and U.S., 25 to 30 years is the usual maximum term (although shorter periods, such as 15-year mortgage loans, are common). Mortgage payments, which are typically made monthly, contain a capital (repayment of the principal) and an interest element. The amount of capital included in each payment varies throughout the term of the mortgage. In the early years the repayments are largely interest and a small part capital. Towards the end of the mortgage the payments are mostly capital and a smaller portion interest. In this way the payment amount determined at outset is calculated to ensure the loan is repaid at a specified date in the future. This gives borrowers assurance that by maintaining repayment the loan will be cleared at a specified date, if the interest rate does not change.

Interest only

The main alternative to a capital and interest mortgage is an interest-only mortgage, where the capital is not repaid throughout the term. This type of mortgage is common in the UK, especially when associated with a regular investment plan. With this arrangement regular contributions are made to a separate investment plan designed to build up a lump sum to repay the mortgage at maturity. This type of arrangement is called an investment-backed mortgage or is often related to the type of plan used: endowment mortgage if an endowment policy is used, similarly a Personal Equity Plan (PEP) mortgage, Individual Savings Account (ISA) mortgage or pension mortgage. Historically, investment-backed mortgages offered various tax advantages over repayment mortgages, although this is no longer the case in the UK. Investment-backed mortgages are seen as higher risk as they are dependent on the investment making sufficient return to clear the debt.
Until recently it was not uncommon for interest only mortgages to be arranged without a repayment vehicle, with the borrower gambling that the property market will rise sufficiently for the loan to be repaid by trading down at retirement (or when rent on the property and inflation combine to surpass the interest rate).