Common Mortgage Mistakes First-Home Buyers Still Make in 2026

Buying your first home is one of the biggest financial decisions you’ll make, and with so much information out there, it’s easy to slip into patterns that seem sensible at the time but cost you later. The good news: most of these mistakes are completely avoidable once you know what to look for. Here’s what we still see first-home buyers getting caught out by in 2026, and what to do instead.

1. Borrowing The Maximum And Calling It A Plan

Getting pre-approval for a large loan can feel like progress. And it is, but the maximum you can borrow and the amount you should borrow are two different numbers.

Lenders assess borrowing capacity based on your income, expenses, and current rate buffers. But they’re not accounting for every part of your life – childcare costs that might be coming, a car that needs replacing, an income pause if one partner takes leave. A loan that’s manageable at today’s rates can feel very different when rates move or circumstances change.

A practical starting point: use a mortgage offset calculator to model what your repayments look like across different loan sizes, then work backwards from a monthly repayment that gives you room to breathe, not just a number the bank will approve.

2. Underestimating What Buying Will Cost You

The deposit is what most first-home buyers focus on. It’s also only part of what you need.

On top of your deposit, you’ll typically need to budget for stamp duty (unless you qualify for an exemption or concession), lender’s mortgage insurance if your deposit is under 20%, building and pest inspections, conveyancing fees, council rates adjustments at settlement, and moving costs. In Queensland, first-home buyers purchasing under $800,000 may be exempt from stamp duty entirely, but it’s worth confirming your eligibility early, not on the day you sign.

A good rule of thumb: set aside at least 5% of the purchase price beyond your deposit to cover buying costs. For a $600,000 property, that’s roughly $30,000 in additional cash to have available.

3. Skipping Pre-Approval Or Treating It As A Guarantee

Pre-approval tells you what a lender is willing to offer based on your finances at a point in time. It’s a useful tool, and most buyers do get it. But two mistakes still come up regularly.

The first is skipping it entirely and making offers based on rough calculations. The second, and arguably the most common, is treating pre-approval as a guarantee and then changing your financial position before settlement. That means taking out a car loan, switching jobs, or running up a credit card balance in the months between pre-approval and settlement. Lenders re-verify your financial position before unconditional approval. Any material change can affect the outcome.

Once your pre-approval is in place, keep your finances as stable as possible until the loan is settled.

4. Choosing A Loan Based On The Interest Rate Alone

The advertised rate gets attention. But the loan that looks cheapest on rate comparison sites isn’t always the right loan for your situation.

A low fixed rate might look attractive right now, but it could lock you into a structure that limits extra repayments, charges significant break costs, or doesn’t include an offset account. A variable rate with a strong offset can save considerable interest over the life of the loan even with a higher headline rate, depending on how you manage your money.

The right loan depends on your income pattern, your savings habits, and your plans. If you’re likely to pay down the loan aggressively, check out how to pay off your mortgage in 10 years – it changes which loan features matter most. Not sure whether fixed or variable suits you? Our fixed vs variable home loan rates guide walks through the trade-offs clearly.

5. Not Using An Offset Account Effectively

An offset account is one of the most powerful features available on an Australian home loan, and one of the most underused.

The way it works: money sitting in your offset account reduces the balance the lender charges interest on each day. If you have a $550,000 loan and $30,000 sitting in your offset, you’re paying interest on $520,000. Over a 30-year loan, that daily reduction compounds significantly.

Where buyers go wrong is keeping their offset as a spare account they rarely use, rather than routing all income through it and keeping living expenses there until the bills are due. The longer money sits in the offset, the more interest it offsets. It’s a simple habit change with a meaningful financial impact.

6. Staying Loyal To The Wrong Lender

This is still the most financially costly mistake on the list, and it tends to happen gradually rather than all at once.

You get a home loan, the first year or two go fine, and then life gets busy. A rate review that never happens turns into two years, then five. Meanwhile, your lender has been offering new customers better rates than the one you’re sitting on, and you’re quietly paying the loyalty tax.

Research from comparison platforms has consistently shown that long-term mortgage holders pay significantly more than new customers at the same banks. Once you’ve built equity and a payment history, you’re in a strong position to negotiate, or to refinance with a Gold Coast mortgage broker who can quickly establish whether a better product is available.

A good check-in schedule: review your rate at least once a year, and properly assess your loan every two to three years.

7. Not Thinking Beyond The First Home

This one catches people by surprise. Many first-home buyers assume their first purchase and their property journey are separate conversations, but how you structure your first loan has a real impact on what you can do next.

An owner-occupier loan structured purely for your own comfort might not leave you well-positioned to access equity later, convert the property to an investment, or add a second property to your portfolio. The structure of your first loan matters for where you want to be in five to ten years, which is worth a conversation before you sign, not after.

If property investment is something you might consider down the track, our property investment loans page is a useful starting point for understanding how investor finance works alongside an owner-occupier loan.

Your Next Step

Most of these mistakes aren’t obvious in the moment, but they’re the kind of thing a broker spots quickly because they’ve seen the pattern before. If you’re preparing to buy your first home or want a second opinion on a loan you’ve already been offered, our team at GoMC can walk through your situation and tell you what looks right and what might be worth reconsidering.

Call us on 1300 855 244 or book a free discovery meeting, no obligation, just a clear conversation about where you stand.

Disclaimer: This article is general in nature and does not constitute financial advice. Please speak with a qualified professional about your individual circumstances.