Let me see if I can explain what I am trying to do. I have client that has employees that will be making purchases through an online store. In most cases these employees will be using a personal credit card and will subject to tax rules. In some cases, these same employees will be using a company P-Card for payment and in this case the sale will be tax exempt.

One thought was to add an additional field to checkout to show that the credit being used is a tax-exempt card and when do the actual capture of the funds, we would just deduct the tax amount at that time.

I guess that leads me to these questions
1. How would add that radio button to the checkout page and have it show on the order confirmation
2. Is there a module that would work for this scenario