The Reserve Bank has lifted the cash rate four times in 2026, but its own officials stress that monetary policy works with a lag, meaning the full effect on household budgets is still unfolding.

When the Monetary Policy Board announces a rate decision at 2.30 pm, the change is immediate on paper. The effect on household budgets, spending and ultimately inflation is not. Governor Michele Bullock made this point in her Opening Statement to the House of Representatives Standing Committee on Economics on 18 September 2026, telling members that monetary policy works with a lag and that the full effects of recent rises were not yet visible.

Eleven days later, the Board raised the cash rate target by another 25 basis points to 4.60 per cent, effective 30 September. That means some of the tightening now in place has barely begun to register in the data.

A timeline of the 2026 tightening

The sequence below is drawn from RBA statements. Exact dates for the first three increases are not included in the material reviewed for this article, so they are described by their position in the year.

  • Early 2026: the first of three cash rate increases. Bullock said on 18 September that the cumulative 2026 increase was 75 basis points at that point, 50 basis points of which had come since her February parliamentary hearing.
  • Between February and August: two further increases, completing the 50 basis points referred to above.
  • 10–11 August: the Board held the cash rate at 4.35 per cent, judging policy "sufficiently restrictive" while remaining "alert to the upside risks to the inflation outlook and being ready to act should they materialise."
  • 13 August: Assistant Governor (Financial Markets) Christopher Kent said "the three cash rate increases earlier this year are having their intended effects", noting that lending and deposit rates had risen and housing credit growth had slowed.
  • 18 September: Bullock told the parliamentary committee that the full effects of recent rises were not yet visible.
  • 29 September: the Board unanimously raised the cash rate by 25 basis points to 4.60 per cent, effective 30 September. Total tightening in 2026 now stands at 100 basis points, based on the RBA's statements.
  • 1 October: the October Financial Stability Review (FSR) was released, assessing how households were coping.

The August pause is a useful marker: Kent's assessment, two days after that meeting, related only to the first three increases.

What the data already show

Even before the September increase, the pressure on budgets was rising. Kent said in August: "Scheduled mortgage payments have risen and are now close to their 2024 peak as a share of household disposable income."

The FSR, published after the September decision, put the share of variable-rate owner-occupiers with a cash-flow shortfall at a level that "remains relatively low at around 2 per cent". Most borrowers in that position have savings to cover the shortfall for at least six months, the FSR found. It also said the share in severe stress "will remain well below its 2024 peak".

On incomes, the FSR noted that real household disposable income per capita declined slightly over the first half of 2026, though it remains higher than its 2023 and 2024 averages.

The latest Financial Aggregates, for August 2026, show housing credit growth of 0.4 per cent in the month and 7.3 per cent over the year, and the Board's 29 September statement noted that new housing loans have declined noticeably.

Why the full effect has not arrived yet

The RBA's material does not set out in detail the mechanics of the lag in each channel, so this article does not attempt to estimate how long each takes. What the officials have said points to several features worth noting.

First, the latest increase is very recent. The 25 basis point rise took effect on 30 September. Data covering the weeks after that date have not yet been published in the RBA material reviewed here.

Second, the cash-flow channel is only one route. Bullock said on 29 September that borrowers have "less cash flow, and they've got less money to spend on things", but described that as one of several channels. She added: "according to our research, in fact, the most important channel is the exchange rate channel."

Third, savings buffers soften the initial impact. Bullock observed that "a lot of people have a mortgage, and then they have an offset account, which sits in the background," and that balances in those accounts have "actually grown quite a lot over the last decade or so." Buffers like these may allow some households to absorb higher repayments for a time.

Fourth, the labour market adjusts gradually. Bullock said the unemployment rate had risen "from 3.5 per cent over the past couple of years to 4.6 per cent", adding: "What it often means is that people might be taking longer to find a job." The August minutes forecast unemployment to rise gradually to 4.8 per cent by the end of 2028.

Where inflation sits on the timeline

The lag also runs to inflation itself. The August minutes forecast underlying inflation to stay above 3 per cent until mid-2027 and to be around 2½ per cent in late 2027. In her 18 September statement, Bullock said the Board's forecast at that time was for inflation to return to the midpoint of the 2–3 per cent target by late 2027.

For now, headline CPI stands at 4.0 per cent over the year to August 2026, while underlying inflation has been about 3.5 per cent for the past six months, according to the Governor, and the trimmed mean was 3.6 per cent in the June quarter.

The RBA has said its next forecast update is in November. The September CPI is due on 28 October and the Board's next decision at 2.30 pm on 3 November.

The bottom line

The RBA's message on timing is consistent: rate rises take time to work, and the full effect of 100 basis points of 2026 tightening is not yet visible. Scheduled mortgage payments were already close to their 2024 peak as a share of income by August, before the September increase. At the same time, the FSR found only around 2 per cent of variable-rate owner-occupiers in cash-flow shortfall, most with savings to draw on. How the remaining effects play out will become clearer as data covering the period after 30 September are released.