1 Exhibit 23 DELOITTE & TOUCHE INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in the Registration Statements (Nos. 33-98440, 33-98444, 33-98442, 33-98446, 333-21799, 333-21795, 333-70599, 333-35812, 333-35814, and 333-50322) on Form S-8 and the Registration Statements (Nos. 333-94757 and 333-50494) on Form S-3 of CheckFree Corporation of our reports dated August 3, 2001, appearing in and incorporated by reference in the Annual Report on Form 10-K of CheckFree Corporation for the year ended June 30, 2001. Deloitte & Touche LLP Atlanta, Georgia September 26, 2001