CANCELLATION charge, an Administrative or Processing fee - what ever you want to call it.
I do not charge a fee for cancellations before the set cancellation date. I charge a 1 night deposit to hold the room, this is not taken until the cancellation window closes (14 days before checkin - 30 for event periods). The only fee I have is not charged unless someone cancels after WITHIN their cancellation period and only is taken IF I rebook the room and I refund their deposit, minus the $10 fee.
I do not get a lot of cancellations, the few that I do get are usually before the window closes. In looking at this closely, I realized I could save myself some effort by not taking the deposit until the window closes, thus decreasing the odds of refunds to nearly zero. If someone cancels after the window, then they should be thankful for any refund and should not balk at the fee.
This works (at least currently) in my market... we are not all in the same market and must look at what the market holds to help us determine our policies..