Each time your item sells, if it doesn't sell out, then you get charged
20 cents for the renewal. If you have your quantity avail. set for more than one, then it happens automatically.
Plus, if you had a good month, then you get charged a 2.5% fee each sale, and a fee (another 2.5 or 3%?) for the credit card transaction- if they used paypal, then that won't show on your bill.
PLUS if you used Etsy to buy your shipping labels, then you will have all of that added to your bill. If you are not careful, especially in a busy month, you will end up with no money in your payment account to pay that bill.
Every Sunday night or early Monday, I look at outstanding bill amount. The bill Etsy sends each month is due way after they have already sent your money to your bank on Monday morning. I look each week and pay it off, so that the money that people paid for shipping, that went into my shop payment account, doesn't end up in my bank account. Then I would get charged for all those Etsy fees on my credit card when the bill is due. It's easy for me to remember on Sunday night, when I'm shutting down my computer.
Hope that helps.