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Exhibit 12.1
 Chief Executive Officer Certification
  1.
    
    I have reviewed this annual report on Form 20-F of Commonwealth Bank of
Australia;2.
    
    Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;3.
    
    Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the company as of, and for, the
periods presented in this report;4.
    
    The companys other certifying officer and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) for the company and have:
 a.
    
    Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the company, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being
prepared;b.
    
    Evaluated the effectiveness of the companys disclosure controls and
procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; andc.
    
    Disclosed in this report any change in the companys internal control
over financial reporting that occurred during the period covered by the
annual report that has materially affected, or is reasonably likely to
materially affect, the companys internal control over financial reporting;
and
 5.
    
    The companys other certifying officer(s) and I have disclosed, based on our
most recent evaluation of internal control over financial reporting, to the
companys auditors and the audit committee of the companys board of directors (or
persons performing the equivalent functions):
 a.
    
    All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the companys ability to record, process,
summarize and report financial information; andb.
    
    Any fraud, whether or not material, that involves management or other
employees who have a significant role in the companys internal control
over financial reporting.




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Exhibit 12.2
 Chief Financial Officer Certification
  1.
    
    I have reviewed this annual report on Form 20-F of Commonwealth Bank of
Australia;2.
    
    Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;3.
    
    Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the company as of, and for, the
periods presented in this report;4.
    
    The companys other certifying officer and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) for the company and have:
 a.
    
    Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the company, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being
prepared;b.
    
    Evaluated the effectiveness of the companys disclosure controls and
procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; andc.
    
    Disclosed in this report any change in the companys internal control
over financial reporting that occurred during the period covered by the
annual report that has materially affected, or is reasonably likely to
materially affect, the companys internal control over financial reporting;
and
 5.
    
    The companys other certifying officer(s) and I have disclosed, based on our
most recent evaluation of internal control over financial reporting, to the
companys auditors and the audit committee of the companys board of directors (or
persons performing the equivalent functions):
 a.
    
    All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the companys ability to record, process, summarize
and report financial information; andb.
    
    Any fraud, whether or not material, that involves management or other
employees who have a significant role in the companys internal control over
financial reporting.