SCHEDULE 14A

(RULE 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No.   )

Filed by the registrant þ
Filed by a party other than the registrant o

Check the appropriate box:

o Preliminary proxy statement

o Confidential, for use of the Commission only (as permitted by Rule Rule 14a-6(e)(2))

o Definitive proxy statement

þ Definitive additional materials

o Soliciting material pursuant to Rule 14a-12

CREDIT ACCEPTANCE CORPORATION

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement if Other Than the Registrant)

Payment of filing fee (check the appropriate box):

þ No fee required.

o Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)	Title of each class of securities to which transaction applies:
(2)	Aggregate number of securities to which transaction applies:
(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
(4)	Proposed maximum aggregate value of transaction:
(5)	Total fee paid:

o Fee paid previously with preliminary materials.

o Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.

(1)	Amount Previously Paid:
(2)	Form, Schedule or Registration Statement No.:
(3)	Filing Party:
(4)	Date Filed:

. NNNNNNNNNNNN + C 1234567890 NNNNNN MR ANDREW SAMPLE 1234 AMERICA DRIVE NNNNNNNNN ANYWHERE, IL 60661 IMPORTANT ANNUAL SHAREHOLDERS’ MEETING INFORMATION — YOUR VOTE COUNTS! Shareholder Meeting Notice 123456 C0123456789 12345 Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Shareholders of Credit Acceptance Corporation to be held on May 21, 2008 Under new U.S. Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the Credit Acceptance Corporation 2008 Annual Meeting of Shareholders’ are available on the Internet. Follow the instructions below to view the materials and vote online or request a paper or e-mail copy. The items to be voted on and location of the Annual Meeting of Shareholders are on the reverse side of this notice. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Proxy Statement and Annual Report to shareholders are available at: www.investorvote.com/CACC When you go online to view materials, you can also vote your shares. 3 Step 1: ^{Easy Online Access — A Convenient Way to View Proxy Materials and Vote} Go to www.investorvote.com/CACC Step 2: Click the View button(s) to access the proxy materials. Step 3: Return to the investorvote.com window and follow the instructions on the screen to log in. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials — If you want to receive a paper or e-mail copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side of this notice on or before Wednesday May 7, 2008 to facilitate timely delivery. C O Y + <STOCK#> 00VMGC

. Shareholder Meeting Notice Credit Acceptance Corporation’s Annual Meeting of Shareholders will be held on Wednesday, May 21, 2008 at 25505 West Twelve Mile Road, Southfield, Michigan 48034 at 8:00 a.m. Eastern Time. The Board of Directors recommends a vote FOR the following proposals: 1. Election of five directors to serve until the 2009 Annual Meeting of Shareholders: Donald A. Foss, Glenda J. Chamberlain, Brett A. Roberts, Thomas N. Tryforos and Scott J. Vassalluzzo. 2. Ratify the selection of Grant Thornton LLP as Credit Acceptance Corporation’s independent registered public accounting firm for 2008. PLEASE NOTE: This is not a proxy. To vote your shares you must vote online or request a set of proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice and identification with you. Information on how to obtain directions so that you can attend the annual meeting and vote in person can be found on our website at www.ir.creditacceptance.com/proxy.cfm. Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the numbers in the shaded bar on the reverse side when requesting a set of proxy materials. 3 Internet — Go to www.investorvote.com/CACC. Follow the instructions to log in and order a paper or email copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. 3 Telephone — Call us free of charge at 1-866-641-4276 using a touch-tone phone and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings. 3 Email — Send email to investorvote@computershare.com with “Proxy Materials Credit Acceptance Corporation” in the subject line. Include in the message your full name and address, plus the three numbers located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by May 7, 2008. 00VMGC