Reading the RBA Cycle Through Austranext Banks

A working note on the gap between cash-rate futures and bank share pricing in the weeks around RBA meetings.

Australian bank equities tend to price in policy shifts earlier than the headline decision, and the spread between cash-rate futures and bank share momentum is one of the cleaner signals on the ASX. This piece walks through the last four RBA cycles and shows where the divergence opened up and closed. It also covers the practical limits of the signal when offshore funding costs move independently of the domestic curve.

Start with what the futures curve is actually saying. Thirty-day interbank cash-rate futures carry the market's implied path for the cash rate, and they reprice continuously. Bank shares, by contrast, reprice in bursts — often on a single analyst note, a funding update, or a quarterly result. That mismatch in reaction speed is where the signal lives. When the curve moves two or three meetings ahead of the bank index, the divergence is usually worth watching rather than trading outright.

Across the cycles I looked at, the divergence opened in the four to six weeks before the meeting and closed within roughly ten sessions after the statement. The pattern was not uniform. In two of the four cycles the bank index led the curve instead, which is the case that catches most people out — it usually means the market is pricing something other than the cash rate, such as net interest margin expectations or offshore wholesale funding.

That is the practical limit. The signal is a domestic-curve read, and it breaks down when offshore funding costs move on their own. If the spread between domestic bank bill yields and their offshore equivalents widens sharply, the bank index can drift for reasons that have nothing to do with the RBA. In those weeks the divergence is noise, not signal, and the position sizing should reflect that.

For anyone building a process around this, the useful discipline is to log the spread weekly, note the direction, and only act when the domestic curve and the bank index agree on the direction of the next move. Everything else is context.