If you’ve been quoted a commercial or business loan rate that references “BBSY plus a margin,” you’ve probably wondered what BBSY actually is. It’s a real, still-published Australian interest rate benchmark, and understanding it helps you make sense of how larger commercial facilities are priced.
What BBSY stands for
BBSY is the Bank Bill Swap Bid Rate. It isn’t a separate benchmark in its own right, it’s a derivative of BBSW, the Bank Bill Swap Rate, which is the core Australian dollar short-term interest rate benchmark used across bank funding and lending markets.
How BBSY relates to BBSW
BBSW is calculated as a mid rate. BBSY is built from it by applying a fixed spread: the BBSY bid rate sits five basis points below BBSW, and the BBSY ask rate sits five basis points above it, for a fixed 10 basis point spread between the two. That spread is set by convention and isn’t adjusted on a whim, it can only be changed with the agreement of the relevant market benchmarks body.
In practice, when a loan facility or floating rate note references “BBSY,” it’s usually the bid side of that spread that gets used in the pricing calculation.
Is BBSY still used today?
Yes. Administration of BBSW (and the BBSY rates derived from it) moved from the Australian Financial Markets Association to the ASX in 2017, but both continue to be calculated and published daily. BBSY still shows up in the pricing of business loan facilities, corporate debt and securitised products across the Australian market.
Where you’ll actually see it
For most small and mid-sized commercial borrowers, you won’t encounter BBSY at all, most business loans are priced off a lender’s own variable or fixed rate. BBSY tends to appear on larger, market-linked commercial facilities, where the rate is expressed as “BBSY plus a margin” and resets periodically, commonly every 90 days, in line with the underlying bank bill rate. If your facility works this way, your repayment can move each reset period as BBSY moves, separately from any change in the margin your lender charges on top.
Why it’s worth understanding before you sign
A BBSY-linked facility behaves differently to a fixed or standard variable rate loan. Your repayment is genuinely exposed to short-term interest rate movements at each reset, not just to your lender’s own rate decisions. That’s not necessarily a bad structure, it can suit businesses with strong cash flow flexibility, but it’s worth going in with eyes open about how the reset mechanism actually works and what it means for your repayments over the life of the facility.
Been quoted a facility priced off BBSY and want a second opinion on the structure? Call us on 1300 562 696 or get in touch and we’ll be back to you shortly.
Frequently Asked Questions
What does BBSY stand for?
BBSY stands for Bank Bill Swap Bid Rate. It’s derived from BBSW, the Bank Bill Swap Rate, by applying a fixed 10 basis point spread, five basis points below BBSW for the bid rate and five basis points above for the ask rate.
Is BBSY the same as BBSW?
No. BBSW is the core benchmark, calculated as a mid rate. BBSY is a derivative of BBSW with a fixed spread applied, used specifically for pricing purposes such as loan facilities and floating rate notes.
Who publishes BBSY?
The ASX has administered and published BBSW and the associated BBSY rates since 2017, when responsibility transferred from the Australian Financial Markets Association. Both are still published daily.
Will my business loan be priced off BBSY?
Most small and mid-sized business loans are priced off a lender’s own standard variable or fixed rate rather than BBSY. BBSY-linked pricing tends to appear on larger, market-linked commercial facilities where the rate resets periodically against the underlying bank bill rate.
Disclaimer: This article is general in nature and doesn’t take into account your individual circumstances. It shouldn’t be relied on as financial advice. Talk to us about how a specific facility is priced and structured before you sign.
