Will the RBA Lift Rates Again if the Middle East Oil Shock Persists? What Borrowers Should Watch Before 11 August

Key takeaway: The RBA has flagged that a persistent, conflict-driven oil shock could force further tightening. With the cash rate at 4.35%, inflation stuck at 4.0% and the next decision due on 11 August 2026, Australian borrowers should plan for rates staying higher for longer — not just for cuts.

Key numbers at a glance

Why is the RBA talking about supply shocks now?

Because the inflation problem Australia faces is increasingly a supply-side one. On 8 July 2026, RBA Assistant Governor (Economic) Sarah Hunter delivered a speech titled "Understanding Supply Shocks and Their Implications for Monetary Policy", setting out how the central bank decides when to "look through" a price shock and when to respond with interest rates.

The timing matters. Annual CPI inflation was 4.0% in May 2026 — a full percentage point above the top of the RBA's 2–3% target band — and the Monetary Policy Board left the cash rate unchanged at 4.35% at its June meeting. When a central bank publishes its thinking on supply shocks while inflation is stuck above target, it is preparing the ground for how it might react if a new shock arrives.

What does the Middle East conflict have to do with Australian mortgage rates?

Oil is the transmission channel. The Adviser reported on 9 July 2026 that persistent conflict-driven oil shocks are now firmly on the RBA's radar as a potential trigger for further tightening. A brief spike in petrol prices is something the RBA can normally look through, because it washes out of the annual figures. A persistent shock is different: higher fuel costs feed into freight, production and services prices, and — most dangerously for a central bank — into inflation expectations. Once households and businesses start expecting higher inflation, it becomes self-reinforcing, and the textbook response is tighter policy.

That is why the 11 August decision is genuinely live in both directions. Markets and bank economists have spent 2026 debating whether the next move is a cut or a hike, and a durable oil shock would strengthen the case for the latter.

"A temporary oil spike can be looked through; a persistent one that lifts inflation expectations cannot — and that is the scenario the RBA is now openly gaming out."

What this means for borrowers: the MPFG view

The practical lesson is to prepare rather than predict. Borrowers who budgeted for cuts in late 2026 should stress-test their repayments at today's 4.35% cash rate — and slightly above — before committing to a new purchase. Homeowners rolling off fixed rates, or sitting on an uncompetitive variable rate, may find that reviewing their loan now is worth more than waiting for a cut that may not come; consolidating higher-interest debts into one facility can also reduce total monthly commitments while the rate outlook is uncertain. For self-employed borrowers, higher-for-longer rates make serviceability assessments tighter at the big banks — which is where flexible income verification, such as Alt Doc lending using BAS statements or an accountant's letter, can keep a purchase or refinance on track. MPFG Capital's Easy Refinance (up to $7.5M) and Alt Doc products are designed for exactly this environment. Explore MPFG's loan products to see which structure fits your situation.

FAQ

Will the RBA raise interest rates at its August 2026 meeting?

No outcome is guaranteed. The cash rate has been 4.35% since 17 June 2026, and the next decision is due at 2.30pm on 11 August 2026. The RBA has signalled that a persistent oil shock from the Middle East conflict could push it toward further tightening, while softer inflation data would argue for holding or easing.

How would a Middle East oil shock affect my mortgage rate in Australia?

Not directly — but persistently higher oil prices lift transport and production costs, which feed into CPI inflation. If that keeps inflation above the RBA's 2–3% target band, the cash rate could stay higher for longer or rise again, which flows through to variable mortgage rates.

What can I do now if I'm worried about another rate rise?

Stress-test your repayments at a higher rate, review whether your current loan is still competitive, and consider consolidating expensive short-term debts. Self-employed borrowers who struggle with bank serviceability tests can also look at Alt Doc options with non-bank lenders such as MPFG Capital.

This article is general information only and does not constitute financial or credit advice. All applications are subject to credit assessment by MPFG Capital (ACL 553698).