How Affordability Assessments Work

Before approving a loan, lease or line of credit, most financial institutions and many landlords carry out some form of affordability assessment. The purpose is to estimate, as accurately as possible, whether the applicant will realistically be able to meet the repayment or rental obligation over time without undue financial strain.

What information is typically used

Affordability assessments generally rely on a combination of documented income and declared or estimated expenses. Common sources of information include recent payslips, bank statements covering several months, and existing credit agreements visible on a credit report. Some assessments also ask applicants to declare their own monthly expenses directly, which are then checked for reasonableness against typical costs for a household of that size and income level.

The debt to income ratio

One of the most widely used measures in affordability assessment is the debt to income ratio, which compares total monthly debt repayments to total monthly income. This ratio gives a quick indication of how much of a person's income is already committed before any new obligation is added. A lower ratio generally indicates more available capacity, while a higher ratio suggests that adding a new repayment could create strain, even if income itself appears sufficient.

Different institutions may set different thresholds for what they consider an acceptable ratio, and the exact calculation can vary depending on which debts and which income sources are included.

Why declared expenses matter

Income alone does not determine affordability. Two applicants with identical income can have very different levels of disposable income once essential living costs are taken into account. This is why many affordability assessments ask for a breakdown of regular expenses such as housing costs, transport, insurance, dependants and existing debt, rather than relying on income figures alone.

Stress testing and buffers

More thorough affordability assessments sometimes include a form of stress testing, checking whether the applicant could still manage repayments if circumstances changed, such as an interest rate increase on a variable rate loan, or a modest reduction in income. This approach is intended to reduce the risk of approving commitments that only remain affordable under ideal conditions.

Common reasons an application may be assessed as unaffordable

Existing debt repayments already take up a large proportion of income
Declared expenses leave very little surplus income each month
Income is irregular, seasonal or difficult to verify
Recent credit history shows missed payments or frequent reliance on short term credit
The proposed repayment, combined with existing commitments, would leave little or no buffer for unexpected costs

What applicants can do to present an accurate picture

Since affordability assessments rely heavily on documentation, applicants are generally better served by providing accurate, complete and up to date records rather than estimates. Settling or reducing existing debt before applying, keeping bank statements free of unnecessary irregularities, and being realistic rather than optimistic about monthly expenses all tend to produce a more accurate and often more favourable assessment.

Affordability assessment is a safeguard, not an obstacle

While affordability checks can feel like a hurdle, particularly when an application is declined or reduced in size, their underlying purpose is protective. A properly conducted affordability assessment aims to prevent both the lender and the borrower from entering into an agreement that is likely to become unsustainable, which ultimately serves the long term financial interests of the applicant as much as the institution granting the credit.