Comparison Rate vs Interest Rate: How to Compare Home Loans

Comparison rate vs interest rate is a distinction worth understanding before a home-loan advertisement becomes a shortlist. The interest rate tells you the price applied to the loan balance. The comparison rate brings specified fees into a standard example. Neither number, by itself, tells you exactly what your own mortgage will cost.

Quick answer

A comparison rate combines the loan’s interest rate with specified fees and charges under a standard example. The interest rate is the rate used to calculate interest on the loan balance. Use the comparison rate as a screening tool, then compare costs for your actual amount, term and required features.

Comparison rate vs interest rate: the basic difference

The contractual interest rate is used to calculate interest under the loan terms. Fees such as an annual package charge can sit outside that rate. A loan with a lower interest rate can therefore cost more than expected if the fees are substantial relative to the balance and time you keep it.

The comparison rate combines the rate and specified costs into a single annual percentage under a defined example. Moneysmart’s home-loan guide recommends looking beyond the headline rate when comparing loans. The comparison figure is useful for identifying offers where fees deserve closer attention.

It is not a separate rate debited to the loan and it is not a personalised quote. Do not multiply your balance by the comparison rate and assume that produces the lender’s actual annual interest charge. Read the contractual rate and fee schedule separately.

Understand the standard example

Australian advertised home-loan comparison rates commonly use a $150,000 secured loan over 25 years. CommBank’s current home-loan warning explicitly identifies those assumptions and warns that different amounts, terms and charges can produce a different result.

That standardisation helps compare disclosed examples, but many borrowers have larger balances, shorter remaining terms or different repayment structures. A fixed dollar fee has a greater relative effect on a smaller loan than on a larger one. The ranking can therefore change when you apply your actual numbers.

Always read the warning attached to the advertised rate. If two examples use different assumptions or loan structures, do not treat their percentages as directly interchangeable. Ask the lender for a personalised cost illustration and, where available, a key facts sheet using your loan details.

A simple example of the effect of fees

Consider two invented variable loans with unchanged balances for one year. Loan A charges 6.00% interest plus a $400 annual fee. Loan B charges 6.08% with no annual fee. These are not actual offers, and the following arithmetic is not a formal comparison-rate calculation.

At the smaller balance, B costs less in this simplified illustration. At the larger balance, A costs slightly less because its lower interest rate outweighs the fixed fee. Real mortgages amortise, interest is calculated under the contract and other charges may apply, so a complete comparison needs a repayment model.

The example explains why you should not choose solely from a standard percentage. It also shows why ignoring fees is a mistake. Both the rate and the dollar charges belong in the decision.

What the comparison rate cannot tell you

A standard example does not know how much money you will keep in an offset, whether you will make extra repayments or when you will refinance. It cannot assign a personal value to convenient account access, support preferences or a feature you may never use.

Some possible costs are outside the figure. Read the lender’s warning and fee schedule for charges relevant to your plans, such as particular transaction costs or early-exit consequences. Do not assume “comparison” means “every cost under every possible scenario”.

Our offset versus redraw guide explains one feature distinction that requires separate assessment. If you expect to hold a substantial offset balance, model it consistently across the loans rather than assuming the advertised comparison rate includes that benefit.

Compare the same amount and remaining term

Use the amount you actually need to borrow, including any costs you intend to finance. Keep the remaining term consistent for an initial comparison. A loan with a longer term can show lower repayments while leaving you in debt for longer and increasing total interest.

Use Moneysmart’s mortgage calculator to compare repayment and interest scenarios. Record whether the interest rate is assumed constant and whether fees are paid upfront or financed. A model is only as useful as its assumptions.

If you deliberately choose a different term for affordability, show that as a separate option. Compare the total payments and remaining balance at a common future date, not just the monthly debit. This makes the cost of the cash-flow relief easier to understand.

Fixed and variable loans need extra care

A fixed-rate loan may have a promotional or fixed period followed by a different rate. Ask how the comparison rate treats the later period. It is not a prediction of what variable rates will actually be when the fixed period ends.

Check the fixed loan’s extra-repayment conditions, offset availability and break-cost provisions. These features can matter if you expect a large cash payment, a move or an early refinance. The advertised rate cannot decide whether those restrictions suit your plans.

For a split loan, compare each portion and the combined fees. Do not apply the fixed rate to the entire balance or assume an offset links to both portions. Request a clear schedule showing balances, rates, repayment types and relevant charges.

Interest-only and principal-and-interest are different structures

An interest-only repayment does not reduce principal during the interest-only period. It can therefore be lower than a principal-and-interest repayment without representing a cheaper loan. The later repayment obligation and total interest need separate consideration.

When screening offers, compare like repayment structures first. Then ask why a different structure is being considered and what it changes over the expected holding period. A rate table cannot answer the suitability question on its own.

If a lender’s estimate uses assumptions different from yours, request a revised calculation rather than manually adjusting one line and leaving the rest unchanged. Repayment amount, term and principal reduction interact, so piecemeal comparisons can be misleading.

Build a loan-specific comparison sheet

Keep the quote date and eligibility conditions. A rate available at a low loan-to-value ratio may not be available to your application. Likewise, a new-customer offer may not apply to an existing borrower changing products internally.

Refinancing adds costs outside the new loan headline

The new lender’s advertisement does not necessarily include what it costs to leave your existing loan. Discharge, break, settlement and other transaction costs can change the result. Our refinancing-cost guide provides a separate worksheet for those items.

Compare an internal retention offer too. Your current lender may offer a different rate or product without the same external switching costs, although fees and feature changes still need checking. A competitive new-loan comparison rate is a reason to investigate, not an instruction to refinance immediately.

If a cashback is offered, record its eligibility and timing separately. Do not count it twice through both a reduced upfront-cost line and an extra credit. Check the underlying recurring cost without the incentive to understand the longer-term structure.

Use the two rates in the right order

Start with the interest rate and comparison rate to identify a shortlist and potential fee-heavy offers. Next read the product documents and confirm eligibility. Finally model the actual loan amount, term, features and expected holding period using consistent assumptions.

If you need help applying the comparison to your circumstances, speak with a licensed lender or mortgage broker and ask for the reasoning behind the options. The CompareUs guide library provides educational explanations, but this article is not a personalised loan recommendation or an approval assessment.

Sources and review

Checked by the CompareUs Editorial Team on 27 September 2026 using Moneysmart loan-selection guidance, CommBank’s comparison-rate warning and Moneysmart’s calculator. The numerical loans are hypothetical; their simple annual cost arithmetic is not a regulatory comparison-rate calculation. Obtain current lender documents before acting.