UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): March 30, 2012

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

Fourth Supplemental Indenture and Supplement No. 1 to the Security Agreement

DriveTime Automotive Group, Inc., a Delaware corporation (“DTAG”), and DT Acceptance Corporation, an Arizona corporation (“DTAC” and together with DTAG, the “Issuers”) are co-issuers, jointly and severally of the 12.625% Senior Secured Notes Due 2017 (the “Notes”) pursuant to the Indenture, dated as of June 4, 2010 (the “Indenture”) among the Issuers, the Guarantors party thereto and Wells Fargo Bank, National Association, as Trustee and Collateral Agent (the “Trustee”) and are parties to the Security Agreement, dated as of June 4, 2010 (the “Security Agreement”) among DriveTime Car Sales Company, LLC, an Arizona limited liability company (“DTCS”) and the Trustee.

On March 9, 2012, Carvana, LLC (“Carvana”), a wholly-owned subsidiary of DTCS was formed. Accordingly, pursuant to the Indenture and the Security Agreement, on March 30, 2012, the Issuers, Carvana and the Trustee entered into the Fourth Supplemental Indenture (the “Fourth Supplemental Indenture”) whereby Carvana became a Guarantor under the Indenture and the Issuers, DTCS and Wells Fargo Bank, National Association entered into Supplement No. 2 (the “Supplement”) to the Security Agreement whereby Carvana became a party to the Security Agreement.

Joinder to Inventory Agreement

DTAG, DriveTime Sales and Finance Company, LLC, DTCS, and DriveTime Ohio Company, LLC, (each a “Borrower” and collectively the “Borrowers”) and Wells Fargo Bank, N.A., a national banking association (“WFBNA”), as the lead lender, and as the agent for the lenders, Santander Consumer USA Inc., an Illinois corporation, as a lender, and Manheim Automotive Financial Services, Inc., a Delaware corporation, as a lender are party to that certain Loan and Security Agreement, dated October 28, 2011 (the “Loan Agreement”). As described above, on March 9, 2012, Carvana was formed. Accordingly, on March 30, 2012, Carvana, the Borrowers and WFBNA entered into the Joinder Agreement (the “Joinder”) whereby Carvana became a Borrower under the Loan Agreement and the other Loan Documents and agreed to be bound by the terms of the Loan Agreement and the other Loan Documents.

The foregoing description of the Indenture, the Fourth Supplemental Indenture, the Security Agreement, the Supplement, the Loan Agreement and the Joinder is only a summary, does not purport to be complete and is qualified in its entirety by reference to the Indenture which is filed as Exhibit 4.1.1 to the Amendment No. 1 to the Form S-4 Registration Statement filed on October 19, 2010, the Fourth Supplemental Indenture, which is filed as Exhibit 4.1 to this Current Report on Form 8-K, the Security Agreement which is filed as Exhibit 4.1.3 to the Amendment No. 4 to the Form S-4 Registration Statement filed on February 3, 2011, the Supplement, which is filed as Exhibit 4.2 to this Current Report on Form 8-K, the Loan Agreement, which is filed as Exhibit 10.5 to DTAG’s Quarterly Report on Form 10-Q filed on November 14, 2011 and the Joinder, which is filed as Exhibit 10.1 to this Current Report on Form 8-K and are incorporated herein by reference.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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