A home loan works best when it fits the way you actually spend. Budgeting is not about cutting out every coffee on the way to the Sorrento foreshore. It is about knowing your numbers, so your loan supports your life rather than squeezing it.
If you are weighing up a home loan, or wondering whether your current one still suits you, this article is for you. The one thing to take away: build your budget first, then choose the loan structure around it.
How Much Home Loan Can You Afford to Repay?
The amount you can afford is the repayment you can keep making comfortably, not the maximum a lender will offer. A lender's figure is a ceiling, and your budget decides where you sit beneath it.
Start with your monthly take-home pay. Subtract fixed costs like insurance, utilities, groceries, childcare and car expenses. Then set aside a buffer for the months that go sideways. What remains is your real repayment capacity. Our borrowing capacity calculator gives a useful starting point, and our mortgage repayment calculator shows what different loan amounts could look like month to month.
My view: aim to land well under your maximum. Lower repayments leave room for rate changes, school fees and the occasional holiday. The trade-off is that you may buy a little less property, or take longer to build equity.
Calculating Home Loan Repayments With a Rate Buffer
Calculating home loan repayments is most useful when you test them at more than one rate. Variable rates can move, so a budget that only works at today's rate is fragile.
As an example, take a loan of $800,000 over 30 years on principal and interest at an illustrative rate of 6.75% p.a. Repayments would be roughly $5,189 a month. Now test it at 7.75% p.a., and the repayment rises to roughly $5,731 a month, about $542 more. Neither rate is a forecast. They simply show the gap your budget would need to absorb.
If that extra $542 would hurt, that is useful information before you commit. It could point you towards a smaller loan amount, a larger deposit, or a different structure.
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Offset Account or Redraw: Which Helps Your Budget More?
An offset account is a transaction account linked to your loan, and the balance in it is deducted from the amount your interest is charged on. Money sitting there could reduce interest while staying available for everyday spending.
Consider a household that keeps $20,000 in a linked offset account against an $800,000 loan at the illustrative 6.75% p.a. Interest is calculated on $780,000 instead, so they are charged interest as if the loan were $20,000 smaller. That is about $1,350 a year in interest not charged, at that illustrative rate. Their repayment stays the same, but more of it goes towards the principal over time. The money is still there if the roof needs fixing.
The trade-off: loans with a full offset can carry higher rates or annual fees compared with basic loans. If your offset balance stays low, those costs may outweigh the benefit. Compare home loan options with your likely savings habits in mind. Interest savings can also have tax consequences in some situations, so speak with your accountant.
Should You Split Your Loan Between Fixed and Variable?
A split loan divides your balance into a fixed portion and a variable portion. It suits people who want some repayment certainty while keeping flexibility on the rest.
The fixed part gives you a known repayment for the fixed period. The variable part usually allows extra repayments and offset features, though fixed portions often limit these. If rates fall, the fixed part will not follow them down, and breaking a fixed rate early can involve costs. Our fixed rate expiry calculator can help you plan for when a fixed term ends.
I like splits for buyers with a tight budget who still want savings flexibility. They are not for everyone, and a single variable loan can be more straightforward to manage.
When Interest Only Makes Sense in a Budget
Interest only repayments cost less each month, but they do not reduce what you owe during that period. They suit specific goals, such as short-term cashflow needs, and are less suited to long-term home ownership plans.
When the interest-only period ends, repayments switch to principal and interest over the shorter remaining term, so they usually rise. A budget that only works on interest only repayments is a warning sign. Read more on interest only loans before choosing this route.
A Sorrento Scenario: Budget First, Loan Second
Consider a couple buying a home near Sorrento who are told they could borrow more than they feel comfortable repaying. Their situation: two incomes, one child in childcare, and a wish to keep weekend travel and savings going.
They map out spending over three months and set a repayment ceiling they would be happy with, even if rates rose by one percentage point. That led them to borrow less than their maximum. Their broker compared loan packages, chose a variable loan with a linked offset, and set up automatic transfers into it on payday.
The outcome: repayments stayed within their ceiling, their savings sat in the offset instead of a separate account, and they did not need to make lifestyle cuts. It is an illustration only, but the order matters. Budget first, then loan.
If you are buying with a smaller deposit, ask about lenders mortgage insurance, as it can add to your costs. Our page on low deposit loans explains how it works. If you are local, our team also covers Sorrento and the wider Peninsula.
Review Your Loan When Your Budget Changes
Your loan should be checked whenever your income, family or spending changes. A loan that suited you three years ago may no longer match your budget.
A quick loan health check can show whether your rate, features and fees still make sense. If not, refinancing may be worth exploring, though switching can involve fees, so the numbers need to stack up first.
Call one of our team or book an appointment at a time that works for you. We will walk through your budget with you, compare loan options from lenders across Australia, and help you choose a structure you feel good about.
Frequently Asked Questions
How much of my income should go towards home loan repayments?
There is no single right figure. Build your budget first, include a buffer, and choose a repayment you could keep making comfortably even if rates rise.
What is an offset account and does it help with budgeting?
An offset account is a transaction account linked to your loan. Its balance reduces the amount interest is charged on, while the money stays accessible. Some loans with offsets carry higher rates or fees, so weigh the cost against your likely balance.
Is a split loan a good idea?
A split loan combines a fixed portion for repayment certainty with a variable portion for flexibility. The trade-off is that fixed portions can limit extra repayments and may involve break costs.
Why should I test my repayments at a higher rate?
Variable rates can change, so testing a higher rate shows whether your budget could cope. For example, moving from 6.75% to 7.75% p.a. on an $800,000 loan over 30 years adds roughly $542 a month, as an illustration.
