This has been put out there, for infrequent eBay sellers and private or small sellers looking at the process of selling on eBay
eBay now takes it's sellers fees/commission per transaction. It's not settled at the end of the month
Say you sell an item which costs $2000. eBay takes around $300 in commission. There will be "available funds" in eBay of $1700 for you.
A buyer pays you for an item that is marked "local pickup only in …" your state. They then tell you they don't live in your state and want a refund.
If all you do is process the refund at this time, eBay will give them the $1700 and then go to your bank account for $300 paid by you. They won't give you the commission, by default. At this point, you'd also need $300 in your bank account to avoid an overdraft situation. Even if your bank has no overdraft charge, you need to know how eBay will penalize you.
If you do an online chat with eBay to explain why you are refunding to the buyer and ask for a commission refund, which can take 30+ mins, eBay can arrange it to be paid to your bank account and you may want to wait till that finishes processing before you do the refund. (In case anything goes wrong with the commission refund, you can get it sorted out before eBay marks the transaction refunded and sorted). In this case, there is a non refundable part, which is only $0.30 which they'll go to your bank account for.
During this time you, the buyer could go to eBay and ask them to arrange the refund. Sometimes, eBay might agree to help out the buyer. Which again means, you need to keep your balance up sufficient to pay the commissions. If you had a garage sale and had $4000 of items, you'd need in excess of $600.
Note: this could happen more than once. It is possible a bunch of pests could take turns buying your item, paying for it, then approaching eBay for a refund.
So it helps to be across the refund process and getting back the commission, before relisting items (or if you have multiple items out there, be aware of the risks)
(I have not attempted to cover the whole refund process; this post just mentions 1 aspect that's changed)
eBay introduced a raft of significant changes. The above is just one of them.
There are other issues like, if you list the way eBay advises, 1 (or 2) day turn around on a sale etc you may have to pay for expedited shipping out of your own pocket. eBay doesn't write it as clearly as this, so good luck deciphering the rest of the changes and assessing the risks involved.
Or you can have a look at platforms that eBay doesn't own, like "Amazon Marketplace". (I'll look at that one; eBay owns Gumtree)
So, if you're planning on having an online garage sale, or running a small business on eBay, good luck deciphering the real impact of the (sometimes tiny) changes eBay made.
I only picked up on this problem when I went to do a refund, and one of eBay's changes is much larger than it looks.
Final valuation fees are collated and taken monthly, not after every purchase. Check when your monthly billing cycle is.
If this is stressing you out, just bank transfer $1 to your account from somewhere/someone else. It's usually instant.