With the item being a plugin on CodeCanyon, the buyer fee is $4.00. This amount is added to the price of your item. So lets say you set the price at $30, the final price that the customer will see is $34.
More on buyers fee here: https://help.author.envato.com/hc/en-us/articles/360000473203
Additionally, there is an author fee, which is a percentage taken off of your earnings for each sale.
You can get a lot more info from here.
Check potnetially Us withholding tax depending on where you are based:
US Tax Treaties:
You are no-exclusive author. and -
Non-Exclusive Author Fee 55%
Your item is in WordPress category. So, the buyer fee is $5
So, from your Item price on the item you can calculate:
( ( List Price/Purchase Price - Buyer fee ) - Withholding Tax ) - Author fee = Author Earning
( ($30 - $5 ) - Withholding Tax ) - 55% = Author Earning
If you fill-up the TAX form then for your location Withholding Tax for US sale is 10% and if not fill-up then 24% and fill-up but not provided TAX info then 28%.
I didn’t read about exclusive author , which is you can only sell submitted products on envato and non exclusive author is you can sell it envato and anywhere else you want.
i didn’t even had any plan to sell it on other platforms anyway.
also thought they charge to make the account exclusive.