Deutsche Asset Management [LOGO]
                                             A Member of the Deutsche Bank Group




Chief Executive Officer
Section 906 Certification under Sarbanes Oxley Act






I, Richard T. Hale, certify that:

1.   I have reviewed this report, filed on behalf of Montgomery Street Income
     Securities, Inc., on Form N-CSR;

2.   Based on my knowledge and pursuant to 18 U.S.C. ss. 1350, the periodic
     report on Form N-CSR (the "Report") fully complies with the requirements of
     ss. 13 (a) or ss. 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.




February 27, 2004                                      /s/Richard T. Hale
                                                       Richard T. Hale
                                                       Chief Executive Officer
                                                       Montgomery Street Income
                                                       Securities, Inc.




                                                Deutsche Asset Management [LOGO]
                                             A Member of the Deutsche Bank Group






Chief Financial Officer
Section 906 Certification under Sarbanes Oxley Act






I, Charles A. Rizzo, certify that:

1.   I have reviewed this report, filed on behalf of Montgomery Street Income
     Securities, Inc., on Form N-CSR;

2.   Based on my knowledge and pursuant to 18 U.S.C. ss. 1350, the periodic
     report on Form N-CSR (the "Report") fully complies with the requirements of
     ss. 13 (a) or ss. 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.




February 27, 2004                                    /s/Charles A. Rizzo
                                                     Charles A. Rizzo
                                                     Chief Financial Officer
                                                     Montgomery Street Income
                                                     Securities, Inc.