Sorry @pauln I can’t follow that. Your samples are really complex. Service is not a product. In fact it is not different than discounts. Do you calculate discount tax and deduct it from tax amount? No. You deduct discount from order amounts and calculate tax from discounted price. Service is just the inverse. It adds %X to prices and tax calculates from that amount. However by enabling “Include Tax” setting (that does not mean tax included) you make SambaPOS to calculate service amount after tax calculation. Try disabling “Include Tax” setting for servicing template.