After four rate rises in 2026, the borrowers coping best are often those with a buffer: savings set aside, or repayments made ahead of schedule. Canstar reported that a meaningful share of customers at the major banks have no mortgage buffer at all, which leaves them exposed to any further rises or setbacks.
Here's how to build one.
What a mortgage buffer is
A buffer is money you can draw on to keep paying your mortgage if something changes. It might be:
- Savings in an offset account
- Extra repayments you can redraw
- Repayments made in advance, putting you ahead of schedule
How much is enough?
Common targets:
- Minimum: one month of repayments
- Comfortable: three months
- Strong: six months or more
On a $3,800 monthly repayment, three months is about $11,400.
Where to keep it
Offset account
Money in an offset reduces the balance you pay interest on, while staying available. $20,000 in offset on a 6.49% loan saves about $1,300 in interest a year, tax-free in effect, because you're not earning taxable interest.
Redraw
Extra repayments reduce your loan and can usually be redrawn. Be aware that some lenders can restrict redraw access in some circumstances, and redraw can be less flexible than an offset.
Savings account
Better than nothing, but interest earned is taxable and usually less than your mortgage rate.
For most borrowers, an offset is the best home for a buffer.
How to build a buffer
1. Pay the "next rise" now
If rates go up another 0.25%, your repayment rises. Start paying that amount extra now. On a $600,000 loan, that's roughly an extra $100 a month.
2. Keep paying your old repayment after a rate cut
When rates eventually fall, keep paying the same amount. The difference builds your buffer automatically.
3. Pay fortnightly
Paying half your monthly repayment every fortnight means 26 half-payments, or 13 monthly payments a year. That's an extra month's repayment each year.
4. Direct windfalls
Tax refunds, bonuses and gifts can go straight into your offset.
5. Round up
Round your repayment up to the next $50 or $100. You won't notice it much, and it adds up.
6. Refinance and keep paying the same
If you refinance to a lower rate, keep your repayment at the old level. On a 0.50% rate cut, that's close to $200 a month into your buffer on a $600,000 loan.
Using your buffer wisely
A buffer is for genuine needs: job loss, illness, a big rate rise, an urgent repair. Try not to use it for holidays or upgrades. If you do dip in, make a plan to rebuild.
Buffers and borrowing
Lenders like to see savings. A healthy offset balance can help when you refinance, apply for a top-up or buy your next property.
Frequently asked questions
Is it better to have a buffer or pay down my loan faster?
With an offset account, you get both. Money in offset reduces interest while staying accessible.
Does a buffer affect my credit score?
No, but it can help your next loan application.
How do I get an offset account?
Many variable loans include one, sometimes as part of a package. If yours doesn't, it may be worth refinancing.
Want help setting up a buffer that works? Call Finfident on 0424 545 654. We'll make sure your loan structure is working as hard as you are.
This article is general information only and doesn't take into account your objectives, financial situation or needs. Figures, rates and scheme rules are current as at October 2026 and can change. Finfident Finance Brokers (ABN 94 679 280 801) is Credit Representative 569374 of Outsource Financial Pty Ltd (ACN 131 090 705), Australian Credit Licence 384324.