Your rate could rise on Tuesday. The data arrives Wednesday

She is 34, with a $620,000 variable mortgage on a two-bedroom unit. If the Reserve Bank lifts the cash rate by 0.25 percentage points next Tuesday, her repayment rises by roughly $100 a month. She has no say in the timing, and neither, it turns out, does the most important piece of data.

She is a composite illustration used to show how the numbers work. She is not a real person, and her loan and repayment figures are illustrative estimates only (a 30-year principal-and-interest loan). Market pricing and RBA comments below are as reported by realestate.com.au.

A decision before the data

The RBA's monetary policy board meets next Tuesday. According to realestate.com.au's finance editor Hope Coumbe, markets were pricing an 88 per cent chance of a rate rise, even though three of the big four banks and a number of economists expect the board to hold until it has seen more data.

That data is the problem. The most recent published inflation figures cover only July. August's figures, which the report describes as crucial for the RBA's forecasts, are not due until 30 September, the day after the board decides.

RBA assistant governor Sarah Hunter said this week that "capacity pressures are manifesting as inflation" and that the risks are "skewed to the upside", meaning the bank is concerned inflation may be running higher than the statistics show. She also said the housing market "has now gone into a cyclical downturn".

Why this lands hardest on the most recent buyers

Borrowers who bought in the last two or three years carry the largest balances relative to income and the least equity buffer. A rise in a falling market squeezes them twice: repayments go up while the value of the asset securing the loan goes down. Many of them passed the bank's serviceability buffer, but that buffer was a test at approval, not a guarantee against a run of increases.

What to do before Tuesday

• Run your own numbers at +0.25 and +0.50. Use your actual balance and remaining term, not the lender's headline example.
• Check your offset and redraw. Money sitting in a savings account earning less than your mortgage rate is often better placed in an offset.
• Ask your lender for a rate review. Existing customers frequently pay more than new ones for the same product.
• If you invest, check rent against repayments on the exact street. Achieved rent, not advertised rent, and local vacancy tell you whether the property can carry a rise.

The limitation

Nobody knows what the board will decide, and market pricing can shift quickly. This article is general information only, not personal financial advice. Speak with a licensed adviser or broker about your own loan.

Source: realestate.com.au, "RBA drops fresh clue on rate hike as inflation warning grows", Hope Coumbe, first published 23 September 2026.