Selling gold info for me please

Let's say I have donor rank and lets say I have 0 coins in my account. Do I need to have at least 1 coin in order to put my gold up for sale? Or does the 1 coin needed for the service get deducted at the time when my gold gets purchased? I hope you understood my question, my english is not that good and I did my best

The latter.

You pay tax only of successfully sold trades. You sell gold for 100 Coins, you get 85 Coins (15% Tax).

Simply: You lose the gold for the service only when and AFTER you actually manage to sell the gold. If you put it up and it doesn't get sold you don't lose any coins.

Ty all!!!!