IBKR does not charge a fee to use the Request for Payment (RFP) deposit method. You will want to check with your bank to see if they charge a fee for RFP, but generally it is free.
Is there a fee to use RFP?
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Why was I charged a fee for a wire deposit?
Why was I charged a fee for a cash withdrawal?
Can I deposit funds by RFP?
Are there any charges for setting up an eDDA?