What it means
The rate you are offered is not one number pulled from the air. It reflects the general level of interest rates in the economy, the lender's own funding costs and margin, and then your specific risk profile as judged by deposit size, credit history, income stability and the type of property.
Fixed and variable rates answer different questions. A fixed rate buys certainty of payment for a defined period at a modest premium, while a variable rate usually starts lower but transfers the risk of rate rises from the lender to the borrower.
The effect of small differences is easy to underestimate. Half a percentage point sounds trivial in conversation but compounds across hundreds of payments on a large balance, which is why shopping the rate is one of the highest-value hours a borrower will ever spend.
Quoted rates also need care. The headline rate excludes fees, so the annual percentage rate, which folds arrangement fees and certain costs into a single comparable figure, is the number to compare when two offers look close.
For businesses, the commercial mortgage rate works the same way but with more variables. Lenders price on the property type, lease quality, tenant covenant and the borrower's trading history, and commercial rates are usually fixed for shorter periods with a balloon payment or refinancing point at the end.
In practice
Real-world examples.
Example
A borrower with a 25% deposit and a strong credit record is quoted 5.9%, while a colleague buying a similar house with a 5% deposit and a thinner credit file is quoted 6.8%. On a $350,000 loan that gap is worth about $3,150 in the first year alone.
Example
A property investor takes a five-year fixed rate at 6.3% rather than a variable rate starting at 5.8%. Rates rise by 1.5 percentage points over the following two years, and the fixed choice turns out to have been cheaper as well as calmer.
Example
A restaurant group refinances a $2,000,000 commercial mortgage as its fixed period ends. Because the business now has three years of stable trading and a longer lease on the anchor site, the lender prices the new facility 0.7 percentage points below the old one.
Formula
Calculation
Monthly payment = P x r / (1 - (1 + r) to the power of -n), where P is the loan, r is the annual rate divided by 12 and n is the total number of payments
Consider a $400,000 loan over 30 years, so n is 360. At 6.5%, the monthly rate is 0.065 / 12 = 0.00541667 and the payment is $2,528.27. At 7.0%, the monthly rate is 0.07 / 12 = 0.00583333 and the payment rises to $2,661.21. The difference is $2,661.21 - $2,528.27 = $132.94 a month, which is about $1,595 a year, and across all 360 payments the higher rate costs $132.94 x 360 = $47,858 more. Half a percentage point, in other words, is worth roughly the price of a family car over the life of the loan.Case study
Seen in the real world.
Silverpath Dental is an invented practice used purely as an illustrative example of rate shopping. The owner needed a $650,000 commercial mortgage on a converted premises and accepted the first offer she received from her own bank at 7.4%, mainly because the relationship manager was helpful and the paperwork was familiar.
Before completion, an accountant persuaded her to ask a broker for a second view. Two lenders quoted 6.7% on the same security, and on a 20-year term the lower rate reduced the monthly payment by roughly $274, or about $3,283 a year, against a broker fee of $2,500 paid once.
The illustrative point is not that her bank behaved badly, but that a lender has no obligation to offer its best price to a customer who has not asked for one. A single week of comparison recovered its cost within the first year and kept paying for nineteen more.
Watch out
Common mistakes.
- Comparing headline rates while ignoring arrangement fees, which can make a marginally lower rate the more expensive deal overall.
- Assuming the rate advertised in a lender's marketing is the rate you will be offered, when the best pricing is usually reserved for large deposits and clean credit files.
- Treating a low introductory variable rate as a permanent saving, without calculating what the payment becomes if the benchmark rises two percentage points.
Questions
People also ask.
What is the difference between the interest rate and the annual percentage rate?
The interest rate is the cost of borrowing alone, while the annual percentage rate folds in fees and certain other costs to give a figure that is comparable between offers.
Can I negotiate my mortgage rate?
Often yes, particularly if you have a competing written offer, a large deposit or an existing relationship, because lenders would rather shave their margin than lose the loan.
Does a shorter term give a lower rate?
Frequently yes, and it also cuts total interest sharply, though the monthly payment is higher, so the trade is between cash flow now and total cost later.
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