It's free to sell but if you promote items, there are selling / Ad fees to pay when the item sells.
Also a fee is charged if any of the following optional listing upgrades are used.
Add any of the following optional listing upgrades, and they all come with a non refundable listing fee.
This is payable sale or no sale and charged the second the item goes live.
Reserves: 4% of the set reserve ( maximum £150 per item)
Subtitles: £2
Listing in 2 categories: 35p
Gallery Plus: £2.50 ( free for clothes and shoes)
Listings with duration 1 - 3 days 35p
As a tip, before clicking on the final List Item With Displayed Fees button, glance just above it, it should read £0.00 Listing Fee.
If there is a fee amount listed there, you have selected an upgrade, and if you wish, it gives you time to scroll up and remove the payable upgrade.
If you have outstanding fees, you must pay them asap, as eBay do use debt collectors to recover those fees.
@wortley23