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Bank Bill Swap Rate (BBSW)


The Bank Bill Swap Rate (BBSW) is a short-term interest rate benchmark used in Australian financial markets. It represents the average rate at which major banks are willing to lend to each other on an unsecured basis for various terms, typically between 1 to 6 months. The BBSW is often used as a reference rate for pricing various financial instruments, such as corporate bonds and floating rate loans.


The phonetics of the keyword “Bank Bill Swap Rate (BBSW)” are: Bank – /bæŋk/Bill – /bɪl/Swap – /swɒp/Rate – /reɪt/B – /biː/B – /biː/S – /ɛs/W – /ˈdʌbəl juː/

Key Takeaways

  1. The Bank Bill Swap Rate (BBSW) is a short-term interest rate used in Australia as a benchmark for various financial instruments, such as loans, securities, and derivatives.
  2. BBSW is calculated daily based on the rates at which major banks in Australia are willing to lend to each other, reflecting the costs associated with short-term wholesale funds.
  3. As it is an important financial indicator, the BBSW is closely monitored by market participants and regulators. It helps in determining pricing and valuation for a wide range of financial products, influencing the overall functioning of the Australian financial market.


The Bank Bill Swap Rate (BBSW) is an important financial term as it serves as a key benchmark in the Australian market for short-term interest rates and fixed income securities. It reflects the cost of unsecured borrowing between banks for a specified term and is used to determine interest rates on a wide range of financial products, such as business loans, mortgages, and floating rate bonds. BBSW directly influences the pricing and valuation of these products, thereby impacting borrowing costs for businesses and consumers, as well as investment decisions and portfolio management strategies for institutional investors. In addition, BBSW serves as a barometer of the overall credit market, providing insights into the health of the Australian financial system.


The Bank Bill Swap Rate (BBSW) is a fundamental aspect of the Australian financial market, serving multiple purposes for various participants. Firstly, the BBSW acts as a benchmark for short-term interest rates, indicating the cost of borrowing unsecured funds in the Australian money market. Financial institutions, such as banks and corporations, often rely on the BBSW as a reference rate for setting interest rates on their financial instruments – including loans, bonds, and various floating rate securities. This ensures consistency in pricing and transparency among market participants, providing insight into the overall state of the economy and the prevailing credit conditions.

Moreover, the BBSW is commonly used for risk management purposes, specifically in the area of interest rate risk. Financial institutions may have differing opinions on the direction of future interest rates, and as such, they use the BBSW in interest rate swaps to hedge their exposure or speculate on the movement of the rates. In an interest rate swap agreement, one party agrees to pay a fixed rate in return for receiving a floating rate (usually based on the BBSW) from another party. This enables institutions to convert their exposure from fixed to floating rates or vice versa, in accordance with their risk appetite and market expectations. The BBSW helps foster efficient capital allocation and risk management in the financial market, ultimately supporting economic stability and growth.


The Bank Bill Swap Rate (BBSW) is an Australian short-term money market reference rate that reflects the borrowing costs for institutions looking to secure short-term funding through the issuance of bank bills. Here are three real-world examples related to the BBSW:

1. Borrowing costs for banks: Banks regularly issue bank bills, which are short-term debt securities, to fund their day-to-day operations. For example, a major bank in Australia, such as the Commonwealth Bank of Australia, may issue a three-month bank bill in the market to raise funds. The interest rate paid on this loan will be determined by the BBSW, reflecting the bank’s borrowing costs in the market.

2. Floating rate bonds: In the bond market, some bonds have a floating interest rate that is linked to the BBSW. For instance, a multinational company may issue a floating rate bond in the Australian market to raise funds for its operations. The interest payments on this bond would typically be based on the prevailing BBSW, plus a fixed margin determined by the issuer’s credit quality. As the BBSW moves up or down, the interest paid to bondholders will also change accordingly.

3. Interest rate swaps: Financial institutions, companies, and investors often enter into interest rate swaps (IRS) to hedge against interest rate risks. The BBSW serves as a benchmark for these swaps in the Australian market. For example, a company may enter into an agreement with a bank to swap its floating interest rate payments on its debt, which is based on BBSW, for fixed-rate payments, thus eliminating fluctuations in future cash flows tied to BBSW movements.

Frequently Asked Questions(FAQ)

What is the Bank Bill Swap Rate (BBSW)?

The Bank Bill Swap Rate (BBSW) is a short-term interest rate benchmark used in Australia for financial instruments with maturities up to twelve months. The BBSW is calculated daily based on the trading of eligible bank bills by participating banks, and it represents the average mid-point of the rates at which these instruments are traded.

How is the BBSW calculated?

The BBSW is calculated through a volume-weighted average pricing (VWAP) methodology that considers all eligible bank bills transactions during a specific time window. A panel of participating banks submits their trades of prime bank eligible securities in the market, and the Australian Financial Markets Association (AFMA) calculates the average mid-rate based on these trade submissions.

What are the maturities for the BBSW?

The BBSW rates are published for various maturities, typically including 1, 2, 3, 4, 5, and 6 months, as well as on an annual basis. The most commonly used BBSW rates are the 1-month, 3-month, and 6-month rates, as they are widely considered standard benchmarks for short-term financing.

What is the significance of the BBSW in the financial markets?

The BBSW is a crucial benchmark for short-term financing in Australia, used for pricing a variety of financial products such as business loans, syndicated loans, floating rate bonds, interest rate swaps, and other derivatives. It also serves as a reference rate for determining interest payments on some adjustable-rate mortgages and other floating rate securities.

How does the BBSW differ from other benchmark rates such as LIBOR?

While both BBSW and LIBOR are benchmark rates used for short-term interest rates in their respective markets, the key difference lies in their calculation methodologies and the markets they represent. BBSW is based on the actual trading of eligible bank bills in the Australian market, while LIBOR (London Interbank Offered Rate) represents the average rate at which leading banks in London are willing to lend to each other in different currencies. LIBOR is also being phased out due to manipulation scandals and will be replaced by alternative reference rates by the end of 2021.

Can the BBSW be influenced or manipulated?

The BBSW calculation methodology incorporates actual transactions and employs measures to counter potential manipulation. However, like any financial benchmark, it is not entirely immune to manipulation risks. The Australian Securities and Investments Commission (ASIC) closely monitors trading activity, and the financial industry has implemented procedures, guidelines, and regulations aimed at ensuring the integrity of the BBSW and other benchmarks.

Related Finance Terms

  • Interest Rate Benchmark
  • Wholesale Short-term Money Market
  • Bank Bill Yield
  • Australian Financial Markets Association (AFMA)
  • Interbank Lending

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