What it means
When a lender offers a fixed rate, it is effectively selling the borrower insurance against rising rates and charging a small premium for it. That premium shows up as a starting rate a little higher than the floating equivalent, which is why floating loans often look cheaper at the moment of signing.
Whether the fixed rate turns out to be better depends entirely on what rates do afterwards, which nobody knows in advance. The main business case for fixing is predictability rather than cost.
A company that can forecast its interest expense precisely can budget with confidence, price long contracts more accurately, and reassure lenders and investors that a rate shock will not derail it. For businesses with thin margins or heavy borrowing, that certainty is often worth more than the chance of saving a fraction of a percentage point.
Fixed rates are usually attached to a fixed period rather than the whole life of a loan. A common structure is a five-year fixed term on a fifteen-year loan, after which the loan reverts to a floating rate or is refixed at whatever rates then apply.
This means fixing does not remove interest rate risk; it postpones it to a known future date, which is itself valuable because it can be planned for. Breaking a fixed rate early is where borrowers get caught out.
Because the lender has arranged its own funding to match, early repayment usually triggers a break cost or prepayment penalty that can run to several per cent of the outstanding balance. That cost is highest exactly when rates have fallen, which is precisely when a borrower most wants to refinance.
Fixed rates also appear on the investing side, in term deposits, fixed rate savings accounts and conventional bonds. The same logic applies in reverse: the depositor gives up flexibility and the chance of higher returns in exchange for a known outcome.
In both directions, the underlying question is simply who is being paid to carry the uncertainty.
In practice
Real-world examples
Example 1
A dental practice borrows $600,000 at a fixed 6.5% over ten years to buy its premises. The owner accepts a slightly higher starting rate than the variable option because the practice's revenue is stable and predictable monthly costs make the partnership's profit share easy to plan.
Example 2
A property developer fixes the rate on a construction loan for the eighteen-month build period only. The certainty protects the project budget while the building is unsaleable, and the developer plans to repay in full on completion rather than carry the debt long term.
Example 3
A logistics company holding $4,000,000 of debt splits it deliberately, fixing 60% and leaving 40% floating. The mix caps the damage from a rate spike while still allowing part of the cost to fall if rates decline.
Think of it
A fixed interest rate is like booking a holiday package where the total price is locked the moment you pay. Even if flights and hotel prices double later, your holiday costs you nothing extra.
Formula
Calculation
Annual Interest = Principal x Fixed Annual Rate
Total Interest Over the Term = Annual Interest x Number of Years (for an interest-only loan)
Worked example. A manufacturer borrows $250,000 on a five-year interest-only facility at a fixed rate of 6% a year.
Annual interest = $250,000 x 6% = $15,000.
Total interest over five years = $15,000 x 5 = $75,000.
The payment is $15,000 every year no matter what happens to market rates, and the $250,000 principal is repaid at the end.
Now compare a floating alternative. Suppose the floating option started at 5% but, over the five years, the rate averages 7.5% as central bank policy tightens.
Average annual interest on the floating loan = $250,000 x 7.5% = $18,750.
Total floating interest over five years = $18,750 x 5 = $93,750.
The fixed rate borrower pays $93,750 - $75,000 = $18,750 less over the term, which is 25% below the floating cost. Had rates instead averaged 4.5%, the floating loan would have cost $250,000 x 4.5% x 5 = $56,250, and the fixed rate borrower would have paid $18,750 more for the certainty.Case study
Seen in the real world
Here is an illustrative, fictional example. Wrenfield Nurseries operated eleven childcare centres and funded its expansion with $3,200,000 of floating rate debt, mainly because the introductory rate was 1.2 percentage points below the fixed quote. Fees to parents were set annually and could not be raised mid-year, so the business had rigid revenue and flexible costs, which is the wrong way round.
Over two years the floating rate climbed from 5.4% to 8.9%, adding around $112,000 a year to interest costs the company could not pass on until the next fee review. The finance director calculated that fixing at the outset would have cost roughly $38,000 extra in year one and saved considerably more than that in year two alone.
At the next refinancing Wrenfield fixed 75% of its borrowing for five years and left the balance floating to preserve some flexibility for early repayment. In this fictional case the decision was framed not as a bet on interest rates, but as matching the flexibility of the debt to the flexibility of the revenue.
Watch out
Common mistakes
- Choosing a fixed rate purely because it is lower than the current floating rate, or rejecting it purely because it is higher. The comparison that matters is against expected rates across the whole term, not against today's number.
- Ignoring break costs when fixing. Early repayment of a fixed rate loan usually carries a penalty designed to compensate the lender, and borrowers who expect to sell an asset or refinance soon can be trapped by it.
- Assuming a fixed rate means a fixed monthly payment forever. On a loan with a fixed period shorter than its full term, the payment changes at the end of that period, and on amortising loans the split between interest and principal shifts throughout.
Questions
People also ask
Is a fixed rate better than a floating rate?
Neither is universally better; fixed suits businesses that need budget certainty or have inflexible revenue, while floating suits those that can absorb swings or expect to repay early.
Can I fix only part of my borrowing?
Yes, splitting a facility between fixed and floating portions is common and gives partial protection while keeping some flexibility and some benefit if rates fall.
What happens at the end of a fixed rate period?
The loan typically reverts to the lender's standard variable rate unless you refix or refinance, so it pays to start shopping around several months before the date.