Yes, you can attach PDF files at least for the state of Georgia. Georgia requires PDF attachments of tax credit forms. You can only use the tax credits if you file electronically AND attach the forms. I have not file in any other states, but I would think other states will have the option for mandatory attachments.
Go to VIEW; select STEP-BY-STEP; then select STATE TAX; look for OTHER SITUATIONS, go to the PDF ATTACHMENTS option, and follow the steps...you will be asked to name the document and then to attach the PDF file.
