1. Click "Network"
2. Click "Clients"
3. Click on the "Eye" Icon of the client that you want to mark "Tax Exempt"
4. Scroll down to the bottom and check the "This company is tax exempt" field
*Note: While generating a new Invoice for the Tax Exempt Client there'll be no Tax added. However, if you wish to make an exception you can always uncheck the "Tax Exempt" checkbox while creating the Client Invoice
5. Click "Save & Continue"
