Most lenders advertise one rate and approve another.
Your advertised variable rate means nothing until a credit assessor runs your income through serviceability and decides what discount you qualify for. FIFO civil engineers with project-based contracts or rotating rosters often land a smaller discount than permanent salaried workers, even when the income is higher. That gap costs you thousands over the loan term, and most brokers won't tell you which lenders treat FIFO income the same as base salary when calculating your rate.
How lenders calculate your actual interest rate
Every lender starts with a standard variable rate, then applies a discount based on your deposit size, loan amount, and how they classify your employment. A civil engineer on a two-year mining project contract with a 15% deposit might be offered 0.40% off the standard rate at one lender and 0.70% off at another, purely because the second lender's credit policy treats contract income as stable employment. The difference on a $600,000 loan is roughly $90 per month, or close to $32,000 over a 30-year term. Rate discounts also depend on whether you take out an offset account, package your loan with other products, or borrow above a certain threshold. Some lenders increase the discount at $500,000, others at $750,000. If your loan amount sits just below a threshold, borrowing an extra $10,000 might reduce your rate enough to offset the additional interest on that amount.
Fixed vs variable: what works for shift patterns
A fixed rate locks your repayments for one to five years, which suits engineers who want certainty during a project cycle or plan to salary sacrifice while rates are steady. A variable rate moves with the market and lets you make extra repayments without penalty, which works if you're funnelling roster bonuses or shutdown pay into the loan between swings. Some lenders let you fix up to 100% of the loan, others cap it at 90% and require the remainder to stay variable. If you fix the full amount and rates drop, you're stuck unless you're willing to pay break costs. If you fix nothing and rates climb, your repayments increase every time the lender adjusts its variable rate. A split loan divides the balance between fixed and variable portions, so you get partial protection and partial flexibility. Consider a civil engineer borrowing $700,000 who fixes $500,000 at 5.89% for three years and leaves $200,000 variable at 6.20%. Repayments on the fixed portion stay the same regardless of rate movements. The variable portion can be paid down faster during high-income months without penalty, and if rates fall, that portion benefits immediately.
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Offset accounts and how they cut interest without changing your rate
An offset account is a transaction account linked to your home loan. Every dollar in the offset reduces the balance on which interest is calculated. If your loan balance is $650,000 and you hold $40,000 in the offset, you pay interest on $610,000. The account earns no interest itself, but the interest you avoid is equivalent to earning your loan rate tax-free. For FIFO workers who accumulate cash between rosters or hold funds for upcoming tax bills, an offset often saves more than a term deposit would earn after tax. Not all loan products include an offset. Some lenders charge a higher interest rate or annual fee to access one. Compare the cost of the offset feature against the interest you'll actually save based on the average balance you expect to hold. If you're only keeping $5,000 in the account, the benefit is minimal. If you're holding $50,000 or more consistently, the saving can exceed $3,000 per year at current variable rates.
Rate discounts lenders don't advertise
Most lenders publish a standard variable rate and a headline discount for new borrowers, but additional discounts exist for specific circumstances. Some lenders offer an extra 0.10% to 0.15% off if you're refinancing from a competitor, especially if you're bringing across a loan above $400,000. Others reduce your rate if you're borrowing to buy new construction or a property in a regional area they're targeting. Package discounts apply when you bundle your home loan with a credit card, transaction account, or insurance product through the same lender. The package might cost $395 per year but deliver a 0.20% rate reduction, which saves $1,200 annually on a $600,000 loan. Some lenders also offer profession-based discounts for engineers, though these are rarely promoted publicly and depend on the lender's risk appetite at the time you apply. You won't see these discounts on a comparison website. A broker who understands which lenders are discounting FIFO income this quarter will get you a lower rate than you'd find by applying direct. Lenders adjust their risk settings and discount structures every few months, so a lender who wasn't competitive six months ago might now be offering the lowest rate for your situation.
How loan structure affects your interest rate over time
Interest-only loans let you pay interest without reducing the principal for a set period, usually one to five years. The rate is often 0.30% to 0.50% higher than a principal and interest loan, and repayments jump significantly once the interest-only period ends. This structure suits investors or buyers who plan to sell or refinance within a few years, but it's rarely the right choice for an owner-occupied purchase unless you're redirecting the cash flow into higher-return investments. A principal and interest loan reduces your balance with every repayment, which builds equity and lowers the amount you're charged interest on each month. Repayments are higher, but you own more of the property sooner. Some civil engineers on long rosters prefer interest-only for the first few years to keep repayments low while adjusting to the roster, then switch to principal and interest once income is stable. If you're planning to do this, confirm the lender allows the switch without refinancing. Some will, some won't, and if you have to refinance to change the structure, you'll pay application fees and possibly a higher rate if market conditions have shifted.
When to lock in a rate and when to let it move
If you're pre-approved or under contract and rates are rising, most lenders let you lock in a fixed rate for 90 days while you settle. If rates fall during that window, you're still bound to the locked rate unless the lender offers a one-time re-lock option. If rates are falling or stable, leaving your application on a variable rate until settlement means you benefit from any cuts before the loan starts. Once the loan is active, switching from variable to fixed usually takes one to two weeks and doesn't require a full application, though the lender will reassess your loan-to-value ratio and may require a new valuation if property values have dropped since you purchased. Switching from fixed to variable before the fixed term ends triggers break costs, which can run into tens of thousands of dollars depending on how far rates have moved since you fixed. Some lenders calculate break costs more aggressively than others, so if you think you'll want to refinance or sell before the fixed term ends, choose a variable loan or a shorter fixed term from the start.
What FIFO income does to your interest rate eligibility
Some lenders treat FIFO income as non-standard employment and either increase the rate, reduce the discount, or decline the application outright. Others assess it the same as permanent full-time work, provided you've been in the role for three months and can show payslips covering at least two full roster cycles. The difference isn't always obvious until you're deep into the application process. A civil engineer with 18 months of continuous FIFO income through the same employer should be assessed at the standard rate, but if the lender's policy requires 24 months of employment history, you'll either be declined or offered a higher rate under a low-doc or alt-doc policy. Mortgages for FIFO workers are assessed differently depending on whether the lender considers your roster a permanent arrangement or a fixed-term contract. If your contract is renewed annually but the role is ongoing, some lenders will treat it as permanent. Others won't, and you'll need a broker who knows which credit policies are written for mining industry employment.
Comparing rates without wasting time on applications
Applying for a home loan triggers a credit enquiry, and multiple enquiries in a short window can lower your credit score if they're not lodged strategically. A broker can compare rates across 30 or more lenders without submitting a formal application until you've chosen the best option. This is particularly useful for FIFO applicants, because some lenders will decline your income structure at the credit assessment stage even if their advertised rate looks competitive. If you apply direct and get declined, that enquiry stays on your file for five years. If a broker pre-qualifies your income with the lender's credit team before applying, you avoid the decline and the enquiry. When comparing rates, look at the comparison rate as well as the advertised rate. The comparison rate includes most fees and gives a more accurate picture of the total cost. A loan with a 6.10% advertised rate and a $600 annual fee might have a comparison rate of 6.18%, while a loan at 6.15% with no ongoing fees might have a comparison rate of 6.16%. The second loan costs less over time despite the higher headline rate.
How refinancing resets your rate and your options
If you've been in your current loan for two years or more, your interest rate is probably higher than what new borrowers are being offered today. Lenders don't reduce your rate automatically. Refinancing to a new lender or renegotiating with your current lender can drop your rate by 0.50% to 1.00%, depending on how long you've been paying the old rate. Home loan refinancing for FIFO workers also lets you restructure the loan, access equity, or switch from interest-only to principal and interest without starting a new 30-year term. Some lenders offer retention rates if you threaten to leave, but the discount is usually smaller than what you'd get by refinancing. Refinancing costs roughly $1,500 to $3,000 in application fees, valuation, and discharge costs, though many lenders will waive the application fee or refund it at settlement if you're bringing across a loan above a certain size. If refinancing saves you $200 per month, the upfront cost is recovered in under a year.
Your interest rate isn't static, and neither is the lending market. Call one of our team or book an appointment at a time that works for you.
Frequently Asked Questions
How do lenders decide what interest rate discount I get?
Lenders apply discounts based on your deposit size, loan amount, employment type, and whether you take an offset account or package. FIFO civil engineers may receive a smaller discount if the lender classifies contract income as non-standard, even when the income is stable and higher than permanent roles.
Should I fix my interest rate or keep it variable on a FIFO income?
A fixed rate suits engineers who want certainty during a project cycle, while a variable rate allows penalty-free extra repayments from roster bonuses. A split loan gives you both: partial protection if rates rise and flexibility to pay down the variable portion faster.
How much does an offset account save compared to just paying extra off the loan?
An offset account reduces the balance on which interest is calculated, so every dollar in the account saves you interest at your loan rate. For FIFO workers holding $40,000 or more between rosters, the saving can exceed $2,500 per year at current variable rates without locking the funds away.
Can I get a lower interest rate if I refinance my current home loan?
Refinancing after two or more years can reduce your rate by 0.50% to 1.00%, depending on how long you've been on the old rate. Lenders offer better rates to new borrowers than they do to existing customers, so refinancing often delivers a lower rate and better loan features.
Do lenders charge FIFO workers a higher interest rate than permanent employees?
Some lenders increase the rate or reduce the discount for FIFO income, while others assess it the same as permanent full-time work. The difference depends on the lender's credit policy and how they classify contract or roster-based employment, which is why working with a broker who knows FIFO-friendly lenders matters.
