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BBSW vs Cash Rate: Why Your Business Loan Rate Doesn't Move When the RBA Does

Understand why business loan rates often lag the RBA cash rate: BBSW is the key benchmark, not the cash rate. Learn how BBSW moves and what it means for your repayments.

Why Business Loan Rates Don’t Mirror the RBA Cash Rate

Many business owners assume their loan rate moves in lockstep with the Reserve Bank of Australia’s cash rate. In practice, most variable business loans are priced off a different benchmark: the Bank Bill Swap Rate, or BBSW. BBSW is the average mid-rate for bank bills traded in the Australian money market, and it can diverge from the cash rate for several reasons.

What Is BBSW and How Does It Differ from the Cash Rate?

The cash rate is the RBA’s overnight interest rate target, used to influence the cost of funds in the economy. BBSW, on the other hand, reflects the rates at which banks borrow and lend for short periods (typically 30, 60, or 90 days) in the money market. Because BBSW is market-determined, it moves with supply and demand for short-term funding, not directly with the RBA’s announcements.

Graph showing BBSW and cash rate movements

Why Does BBSW Move Differently from the Cash Rate?

BBSW can move ahead of or behind the RBA’s cash rate changes. For example, if financial markets expect the RBA to cut rates, BBSW may fall in anticipation. Conversely, if there is a sudden increase in demand for short-term funds, BBSW can rise even if the cash rate is unchanged. Additionally, BBSW reflects the perceived credit risk of banks; if market sentiment deteriorates, banks may have to pay more to borrow, pushing BBSW up.

What Does This Mean for Your Business Loan?

If your business loan is priced at a fixed margin over BBSW, your rate will adjust when BBSW changes, not necessarily when the RBA moves. This can lead to surprises: after an RBA rate cut, your loan rate might not fall immediately, or might even rise if BBSW increases. To manage this, it’s important to understand your loan’s benchmark and monitor BBSW trends.

How Can You Stay Informed About BBSW Movements?

BBSW rates are published daily by the Australian Financial Markets Association (AFMA). You can track them via financial news outlets or your lender. Knowing BBSW’s direction can help you anticipate changes in your repayments and plan your cash flow better. If your loan has a fixed margin over BBSW, you may want to consider fixing your rate when BBSW is low, but always weigh the costs and benefits.

Business owner comparing loan rates

FAQ

Is BBSW the same as the cash rate?

No. BBSW is a market benchmark for short-term bank bills, while the cash rate is the RBA’s target for overnight funds. They are separate rates that can move independently.

Does the RBA set BBSW?

No. BBSW is determined by the market through actual bank bill trades. The RBA does not directly set BBSW, though its monetary policy can influence it.

How often is BBSW updated?

BBSW is published each business day by AFMA, reflecting the day’s market conditions.

Can my business loan rate change even if the RBA keeps the cash rate steady?

Yes. If your loan is linked to BBSW, your rate can change whenever BBSW moves, regardless of the cash rate decision.