More customization to invoice automation

Hello!

I’ve recently been informed of a tax law in Alabama that essentially leaves the total taxable amount up to the business owner. Previously it would be roughly 10% of the total sale to be remitted, but in discussion with a local tax expert, the delivery fee is what is taxable and although all my goods are delivered via download, I can determine what that cost would be to my business. Long story short, I would like a feature to allow me to automate the taxable amount to a portion of the total cost to the agent.