How does the 25% fee work?

The plain version

The fee is tied to new profit only. If your copied profit moves above its old high point, Currents calculates 25% of the new bit above that line.

Your broker still holds your money. Billing is separate from broker deposits and withdrawals.

A simple example

1. Your previous high point is $1,000 profit.
2. This month your copied profit reaches $1,200.
3. The new profit above the high point is $200.
4. Currents' 25% fee applies to the $200, so the fee is $50.

Is the fee charged on my deposit?

No. The fee is not charged on your original deposit. It is tied to new profit above the high-water mark.