EX-99.(a)(2)(iv)

Deloitte & Touche LLP
111 S Wacker Drive
Chicago, IL 60606
USA

Tel: +1 312 486 1890
Fax: +1 312 247 1890
www.deloitte.com

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-251787 on Form N-2 of our report dated December 19, 2022, relating to the financial statements and financial highlights of Calamos Global Total Return Fund appearing in this Annual Report on Form N-CSR of Calamos Global Total Return Fund for the year ended October 31, 2022.

Chicago, Illinois

December 19, 2022