Which factors determine how a mortgage lender calculates variable interest rates?

• A. (i) and (ii) only.
• B. (i), (ii) and (iii).
• C. (i) only.
• D. (i) and (iii) only.

Answer: (B)

Variable mortgage rates move with multiple moving parts, not a single number. The rate a lender quotes is usually built from three broad factors: a base or reference rate that follows market conditions (often linked to a central bank rate or a similar benchmark), the lender’s own funding costs and margin (which cover risk and profit), and borrower- or loan-specific characteristics (such as loan-to-value ratio, credit risk, loan type, and terms).

If the reference rate climbs, the overall rate tends to rise, because the base part of the price has increased. The lender also adjusts the margin based on how risky the loan is and how costly it is for the lender to fund or securitize it; a higher LVR, weaker credit profile, or a more expensive funding arrangement can push the margin higher. Finally, the specific features of the loan—for example, the repayment type, term length, or product discounts—can tweak the price up or down.

All three of these areas are considered in setting a variable rate, which is why the best answer includes them together. If any one of these factors were ignored, the rate wouldn’t accurately reflect current costs, risk, and loan terms.