**President**

**Section 906 Certification under Sarbanes Oxley Act**

 

 

 

I, Michael G. Clark, certify that: 

 

| 1. | I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares and Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSRS; |
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| 2. | Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSRS (the “Report”) fully complies with the requirements of § 13 (a) or §15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. |
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| December 29, 2008 | /s/Michael G. Clark                                                                                                                                        |
|-------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------|
|              | Michael G. Clark                                                                                                                                           |
|              | President                                                                                                                                                  |
|              | Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares and Government Cash Managed Shares), a series of Cash Account Trust |

 

 

 

 

**Chief Financial Officer and Treasurer**

**Section 906 Certification under Sarbanes Oxley Act**

 

 

 

I, Paul Schubert, certify that: 

 

| 1. | I have reviewed this report, filed on behalf of Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares and Government Cash Managed Shares), a series of Cash Account Trust, on Form N-CSRS; |
|----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

 

| 2. | Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSRS (the “Report”) fully complies with the requirements of § 13 (a) or § 15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

 

 

| December 29, 2008 | /s/Paul Schubert                                                                                                                                           |
|-------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------|
|              | Paul Schubert                                                                                                                                              |
|              | Chief Financial Officer and Treasurer                                                                                                                      |
|              | Government & Agency Securities Portfolio (DWS Government Cash Institutional Shares and Government Cash Managed Shares), a series of Cash Account Trust |