Hello,
By charging a seller's final fee based on the total cost of the sale including sales tax effectively raises the selling fee beyond the stated percentage. Sellers do not collect or benefit from sales tax. Selling fees should be calculated excluding sales tax. When I calculate the price of an item I am selling I consider eBay fees based on that number. Including sales tax in the sale total for calculating seller's fees is neither logical nor not fair. Taxes vary from state to state and in some states are very high (close to 10%) and significantly raise selling fees. It would be technically easy to base selling fees on the price of the item plus shipping. Those are our costs. Taxes are beyond our control. We should not be dinged for them!
Best,
Kristin