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Exhibit 31(a)
 CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE
SECURITIES EXCHANGE ACT OF 1934, AS AMENDED
  1.
    
    I have reviewed this Annual Report on Form 10-K of CheckFree Corporation;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 registrant
as of, and for, the periods presented in this report;4.
    
    The registrants other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rule 13a-15(e) and 15d-15(e)) and internal control over financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the
registrant 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
registrant, 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)
    
    Designed such internal control over
financial reporting, or caused such
internal control over financial
reporting to be designed under our
supervision, to provide reasonable
assurance regarding the reliability
of financial reporting and the
preparation of financial statements
for external purposes in accordance
with generally accepted accounting
principles;(c)
    
    Evaluated the effectiveness of the
registrant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; and(d)
    
    Disclosed in this report any change
in the registrants internal control
over financial reporting that
occurred during the registrants
most recent fiscal quarter (the
registrants fourth fiscal quarter
in the case of an annual report)
that has materially affected, or is
reasonably likely to materially
affect, the registrants internal
control over financial reporting;
and
 5.
    
    The registrants other certifying officer(s) and I have disclosed, based on our
most recent evaluation of internal control over financial reporting, to the
registrants auditors and the audit committee of the registrants board of
directors (or persons performing 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 registrants ability to
record, process, summarize and
report financial information; and(b)
    
    Any fraud, whether or not material,
that involves management or other
employees who have a significant
role in the registrants internal
control over financial reporting.
 Date: August 24, 2007
    /s/ Peter J. KightPeter J. KightChairman and Chief Executive Officer

CheckFree Corporation