Mortgage affordability describes the relationship between the ongoing costs of financing a property and the borrower’s income. The rule of thumb is that the costs of financing should not be more than a third (33%) of a borrower’s gross income. Lenders such as banks, insurers and pension funds check this in order to ensure that a borrower can afford the interest payments over the long term. Some lenders also grant mortgages when affordability is stretched, that is, when a borrower’s income covers less than a third of the financing costs. However, this is mostly on the condition that the product is a fixed-rate mortgage that is regularised to meet the standard affordability requirement of 33% over the course of its term.
Lenders need to know whether their customers can afford the ongoing costs of owning a home over the long term. This is why they pay close attention to affordability. This refers to the relationship between the total costs of having a mortgage and the household income of the borrower(s). The so-called affordability calculation is used to determine total costs. It’s important to note that the calculation for determining the ongoing costs of the mortgage is not based on the current or agreed (effective) interest rates. Instead, the calculation uses long-term average (imputed) interest rates – usually from 4.5% to 5%. This so-called imputed interest rate serves as an assurance on the part of the borrower in that it guarantees that they can still afford their payments even if mortgage rates rise. Maintenance and utility costs are set between 0.5% and 1% of the purchase price depending on the provider. To determine the exact percentage rate, the finance provider will draw on the age and energy efficiency of the property. Utilities for new builds or existing buildings that have been renovated to be made more energy efficient are lower than those for older buildings with high energy costs.
As a rule of thumb, the ongoing costs associated with the property should not be higher than one third (33%) of the household income. This includes all regular income including 13 months’ salary and any bonuses, with the latter typically only recognised at a reduced rate, e.g. 50% of the average bonus over the last three years.