Frost is required to charge state and local tax on items sold to purchasers in Illinois, Maryland and Missouri. This tax will be calculated by our system and added to your order after it is submitted, if applicable. A sales tax exemption certificate must be on file at Frost for tax exempt sales and customers. Please fax tax exempt certificates to Frost to the attention of the Frost Credit & Collections at 314-997-5776. Tax exempt certificates are available via PDF by clicking on the tax exempt certificate for your state below.