Bank bill future definition

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Introduction

This security type describes a futures contract on a bank bill. For more information about bonds, refer to security type BILL.

Security description

A futures contract is an agreement to supply a specified commodity, or its cash equivalent, at an agreed date in the future.

The holder of a contract on a bank bill receives the interest rate exposure, and the resulting gains or losses, of the bank bill without having to purchase the asset. In addition, a portfolio can contain both short and long positions in futures contracts, allowing rapid adjustment of the portfolio’s duration at low cost. For these reasons, futures contracts are widely used for hedging and speculation.

FIA treats a futures contract on a bank bill in the same way as a bank bill, save that

  • The bill on which the contract is written is assumed to have a rolling maturity date at a fixed number of years from the current date, in contrast to a physical bill which has a fixed maturity date.
  • The market exposure of the contract is zero, which means that the returns of the futures contract require special treatment when calculating performance. The market exposure is distinct from the effective exposure, which is the theoretical market value of the security on which the contract is written.

Holdings in a futures contract typically require cash holdings in a margin settlement account. The effect of varying cash holdings on the risk and return of the portfolio is not covered here.

In the US, futures contracts are available on 90-day Eurodollars and 1 month LIBOR. In Australia, the Australian Stock Exchange (ASX) offers futures contracts on 90-day bank bills.

Security code

A bond future contract has type BILL_FUTURE.

Calculation of returns

Bill futures are priced using the same routine as for a generic bill. The only difference is that at each calculation date the maturity date is set to the current date, plus the term of the contract in years. For instance, on 15th June 2011 the maturity date of a 90-day contract will be set to 13th September 2011; on 16th June 2011 the maturity date will become 14th September 2014; and so on.

Security file setup

A futures contract on a bond is set up as follows:

Field number Field Type Description Sample
1 Security ID String Identification code 90DDEC2012
2 Name String Name of futures contract 90 day bank bill future Dec 2012
3 Start date Date Date at which record becomes effective [Blank]

01/01/2010

4 Security type String Type code for bill future (BILL_FUTURE) BILL_FUTURE
5 Currency String 3-character currency code AUD
6 Yield curve String Yield curve applicable to this security AUD_CURVE
7 Term Double Term of future, in years 0.25
8 Credit rating String Credit rating AAA
  • The definitions of a conventional bill and a futures contract on a bill are identical, save that a conventional bill requires a fixed maturity date in the ‘Term’ field, while for a bill future the same field contains the contract’s term in years.
  • The credit rating of a futures contract is always AAA. The credit rating field is left here for convenience when comparing the definition of a bill to the definition of a bill future.


Returns file setup

A bill future requires the following information in the returns file:

Field number Field Type Description Sample
1 Date Date Date at end of interval 30/11/2009
2 Portfolio String Name of portfolio STF1
3 Security ID String Identifier for security 90DDEC2012
4 Market weight Double Effective exposure of future within portfolio -0.02189
5 Base currency return Double Base currency return of futures contract 0.00293
6 Local currency return Double Local currency return of futures contract 0.00293

In addition, information on the bond future's yield to maturity, modified duration and convexity can also be supplied. If provided, they will be used in all subsequent attribution calculations. If not supplied, FIA will calculate its own values for these quantities using the supplied security parameters and market data.

Field number Field Type Description Sample
7 Yield to maturity Double Yield to maturity at end of current interval 0.0454
8 Modified duration Double Modified duration at end of current interval 0.540
9 Convexity Double Convexity at end of current interval 1.22
  • The return of the futures contract is calculated as the change in its market value over each interval, divided by the effective exposure of the contract at the end of the calculation interval. FIA understands that futures are treated differently from physical securities and takes this into account in performance calculations. In particular, FIA does not require that futures have a corresponding offsetting cash exposure.
  • The contract month for the future is not used in calculation. It is assumed that the host performance system will handle issues such as contract rollover and margin calls.

Example 1

A portfolio is short a number of 90-day AUD bill future contracts.

This security is represented by a single entry in the security definition file:

Security ID Name Start date Security type Currency Yield curve Term Credit rating Coupon Frequency
90DDEC2012 90 day bank bill future Dec 2012 BILL_FUTURE AUD AUD_CURVE 0.25 AAA

The third field is left blank, indicating that future’s characteristics remain unchanged during its lifetime.

The future has the corresponding entries in the returns file:

Date Portfolio Security ID Market weight Base currency return Local currency return
3/12/2010 STF1 90DDEC2012 -0.000825768 0.00015906 0.00015906
4/12/2010 STF1 90DDEC2012 -0.000826521 0.00015882 0.00015882
5/12/2010 STF1 90DDEC2012 -0.000826533 0.00014387 0.00014387
...

These records show the weight and returns of the bill future over successive days within the STF1 portfolio.

See also

Security type BILL, BOND_FUTURE


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