Mortgage stress isn’t just about rates, it’s about income risk
When we talk about mortgage stress, the conversation almost always goes straight to interest rates. And that makes sense- rates have risen sharply over the past few years, and households have felt it. But focusing solely on rates misses a bigger, and often more important part of the story. Mortgage stress isn’t just about what your rate is. It’s about how stable your income is.
Traditionally, housing stress is defined as spending more than 30% of your income on housing costs. But that number only tells part of the story. For example, two households might both spend 35% of their income on their mortgage. One earns a high, stable income with strong job security. The other relies on overtime, bonuses, or casual work. On paper, they look the same. In reality, they’re not even close. That’s because mortgage stress is really about what’s left over- and how predictable it is.
The income gap is widening the pressure
Recent data from the RBA highlights this clearly. Among lower-income borrowers, the share spending more than one-third of their income on mortgage repayments jumped to around 45% after rate rises began. For higher-income households, that figure is closer to 5%. Same interest rates. Very different outcomes. Why? Because income acts as a buffer. Higher-income households typically have more flexibility, more savings, and lower relative spending on essentials. Lower-income households don’t have that margin.
Stability matters more than ever
There’s another layer to this: income volatility.
In today’s environment, many households aren’t relying on a single, predictable salary. We’re seeing more:
- Self-employed or small business income
- Casual or contract work
- Bonus or commission-based earnings
These can work well in good times- but they can also fluctuate quickly and when your income drops, even temporarily, your mortgage doesn’t. That’s where real stress shows up- not just when rates rise, but when income falls.
Not all 30% is created equal
Even the commonly used “30% rule” has its limitations. The ABS notes that spending more than 30% of income on housing doesn’t automatically mean financial stress, particularly for higher-income households who still have plenty left after repayments. On the flip side, a household spending less than 30% can still struggle if income is low or unstable.
So the real question isn’t just:
“What percentage are you paying?”
It’s:
“What happens if your income changes?”
The real risk most borrowers ignore
Here’s the uncomfortable truth: most borrowers plan for rate rises, but far fewer plan for income risk.
We stress-test loans for higher interest rates.
We build buffers for repayments going up.
But how often do we plan for:
- Reduced work hours
- A business slowdown
- Time off due to illness or family commitments
That’s where mortgage stress tends to catch people off guard.
A more resilient approach
So what does this mean in practice? It means shifting the focus from chasing the lowest rate to building a more resilient financial position.
That might include:
- Keeping a larger cash buffer
- Avoiding over-committing based on peak income
- Structuring debt with flexibility (offset accounts, redraw)
- Reviewing income protection and insurance
Because ultimately, your mortgage is only as sustainable as your income is reliable.
What to do if you’re feeling the pressure
If you’re already experiencing financial stress, the most important step is to act early—not wait until things become unmanageable. Start by speaking with your lender; Australian banks are required to offer hardship assistance, which may include temporary repayment reductions or loan restructuring.
At the same time, review your cash flow honestly. Cutting non-essential spending can create immediate breathing room. You can also access free, independent support through the National Debt Helpline (1800 007 007), which provides practical guidance.
The key is to take control early- because the sooner you act, the more options you’ll have.
So, in essence interest rates matter but they’re only half the equation. In today’s environment, where cost of living is high and income can be less predictable, the real driver of mortgage stress isn’t just how much you pay, it’s how secure your income is while you’re paying it.
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