Yes. CFDs, including index CFDs, share CFDs, and other CFD products, can be traded in a cash type account. A margin account is not required. However, CFD trading always requires initial margin. If you hold a cash account, the necessary funds will be automatically transferred from your main account to meet the CFD initial margin requirement whenever you open a CFD position.
To request CFD trading permissions, please see: https://confluence.core.svc.ibkr.com/spaces/FAQ/pages/27271542/How+do+I+request+CFD+trading+permissions
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