Register For Our Mailing List

Register to receive our free weekly newsletter including editorials.

Home / 122

Calculation and use of BBSW and BBSY

The Bank Bill Swap Rate (BBSW) is an important metric in many markets including the ASX listed (such as hybrids) and over-the-counter bond markets. It’s used as the floating rate note (FRN) benchmark to determine periodic (most commonly quarterly) interest re-sets. It also shows the market’s expectation of future interest rates.

The Australian Financial Markets Association (AFMA) provides independently determined rates, including BBSW that can be used for the revaluation of investments by governments and financial institutions. These rates are collected and published (intra-day, end-of-day, end-of-week and/or end-of-month) for the following wholesale over-the-counter products:

  • Bank Bill Swap Rates (BBSW)
  • Bank Accepted Bills/Negotiable Certificates of Deposit (BAB/NCD)
  • Live Cash and Repurchase Agreements
  • Swaps

BBSW

The AFMA BBSW benchmark rates represent the midpoint of the nationally observed live and executable best bid and best offer (NBBO) for AFMA Prime Bank Eligible Securities. The NBBO calculation is the average of all good samples of the best bid and best offer, such samples sourced from authorised trading venues and taken at three randomised intervals at and around 10:00am.

  • The average of all good NBBO midpoint samples, rounded to four decimal places, is published at approximately 10:15am as the BBSW benchmark rate, for each tenor.
  • BBSW mid rates are published on the AFMA website on the following Business Day, thus making them available to the general public.
  • Financial news media outlets regularly report on BBSW rates, both in tabular form and in commentary.

BBSY

  • ‘Bid’ and ‘Ask’ values for each tenor are published at approximately 10:15am using a set difference respectively of five basis points above and below the BBSW rate.
  • The Bid and Ask values of BBSW are used, amongst other things, by market participants to price floating rate loans. Being directly derived from BBSW and where the only difference is the predetermined and non-variable bid/ask spread to BBSW, rates published on BBSY are a familial derivative of BBSW and not a separate benchmark.
  • The 10 basis point spread between the Bid and Ask values may not be changed without the express consent of both the AFMA Benchmarks Committee and the AFMA Market Governance Committee, and consideration of any change to this spread must be subject to prior consultation with market participants.

 

Elizabeth Moran is Director of Education and Research at FIIG and is the Editor of FIIG’s weekly newsletter The WIRE.

 

UPDATE

NEW BENCHMARK ADMINISTRATOR

From 1 January 2017, ASX is the administrator for the BBSW benchmark rate.  For more information, please visit http://www.asx.com.au/services/benchmark.htm

LIVE FEED OF BBSW

From 31st July 2017, ASX became the calculation agent for BBSW and End of Day Bank Accepted Bill (EODBAB) rates previously produced by AFMA. Subscribers to the BBSW and EOD BAB service will now receive all rates and communication from ASX Benchmarks.

For 24 hour delayed rates visit: http://www.asx.com.au/prices/asx-benchmark-rates.htm

For more information including rate definitions and calculation methodology please visit: http://www.asx.com.au/services/benchmark.htm

 

  •   14 August 2015
  •      
  •   

 

Leave a Comment:

RELATED ARTICLES

Chris Joye on why stocks and property are set for a poor year

The RBA's balancing act

Bonds are copping a bad rap

banner

Most viewed in recent weeks

Why have Australian living standards 'fallen' and how do we fix it?

For the last few years there has been much talk of a 'cost-of-living' crisis in Australia and of 'falling living standards'. Lately this has flared up again with the pickup in inflation resulting in a renewed fall in real wages.

Will you run out of money in retirement?

Fear of running out has become a defining retirement anxiety. Why do some retirees die with substantial wealth while others deplete their nest egg? Evidence suggests the answer is more complicated than we think. 

Four options for an income investor’s next dollar

What if Australia’s golden age of dividends is ending? Rather than overhaul your portfolio, it may be worth considering where new capital can work harder. I discuss four income strategies and the trade-offs behind each.

Why spending more in early retirement can improve lifetime income

Conventional wisdom encourages retirees to preserve superannuation. But if those likely to qualify for the Age Pension later in life spend a little more today, it may deliver higher lifetime income and a more stable retirement.

The investment that sidesteps the new tax traps

Tax rules have changed, but many investors are still using yesterday’s strategies. Insurance bonds may offer advantages for those seeking greater control, tax efficiency and certainty about their wealth.

Testamentary trusts have secured the CGT exemption

Treasury’s latest CGT reform draft delivers a win for testamentary trusts and deceased estates, exempting estate-derived gains from the 30% floor. However, questions on death and divorce rollovers remain unresolved.

Latest Updates

Shares

Is it time to bail on Australian stocks?

For generations, Australian investors have backed banks, miners and dividends. But has that loyalty come at a cost? A look at the numbers raises an uncomfortable question about where future returns will come from.

Investment strategies

Making a case for the 40 year mortgage

The housing debate tends to focus on prices, interest rates and deposits. Yet an overlooked feature of the mortgage itself could help buyers enter the market sooner without abandoning prudent lending standards.

SMSF strategies

Red flags to watch out for when considering an SMSF

Thinking about an SMSF? Before you sign anything, learn how to spot the difference between genuine advice and a sales pitch, understand the real costs, and avoid the compliance mistakes that attract ATO attention.

Investment strategies

Not all income is created equal

Market conditions are shifting as familiar yield sources quietly lose momentum. Australian public credit may be the most compelling source of income in today's market but many investors haven't noticed the shift. 

Investment strategies

The market paid for change, not comfort

Reporting season has delivered a clear message: the market is no longer paying simply for quality, resilience or an earnings beat. It is paying for change in earnings expectations and the outlook ahead. 

Investment strategies

Will AI destroy investor capital?

Some of history's most important innovations changed the world while leaving investors much poorer. As trillions pour into AI, a familiar pattern may be emerging, one that rewards society far more generously than capital.

ASX reporting season: Signals, surprises, stock stories

August reporting season delivered strong earnings and bigger-than-expected dividends, but beneath this, a more nuanced story emerged. First Sentier Investors’ David Wilson and Christian Guerra unpack the key trends.

Sponsors

Alliances

  • ASA-Logo-RGB-ActiveGreen-web.png

© 2026 Morningstar, Inc. All rights reserved.

Disclaimer
The data, research and opinions provided here are for information purposes; are not an offer to buy or sell a security; and are not warranted to be correct, complete or accurate. Morningstar, its affiliates, and third-party content providers are not responsible for any investment decisions, damages or losses resulting from, or related to, the data and analyses or their use. To the extent any content is general advice, it has been prepared for clients of Morningstar Australasia Pty Ltd (ABN: 95 090 665 544, AFSL: 240892), without reference to your financial objectives, situation or needs. For more information refer to our Financial Services Guide. You should consider the advice in light of these matters and if applicable, the relevant Product Disclosure Statement before making any decision to invest. Past performance does not necessarily indicate a financial product’s future performance. To obtain advice tailored to your situation, contact a professional financial adviser. Articles are current as at date of publication.
This website contains information and opinions provided by third parties. Inclusion of this information does not necessarily represent Morningstar’s positions, strategies or opinions and should not be considered an endorsement by Morningstar.