You do not need the form to file the return, just the information. If you happen to know that, just input it as income indicating the type of income it is. You can fill out a 1099 in Turbo Tax using the information that you know. If you don't know the exact amounts, estimate based on what you have such as bank or other financial account statements, or documents you have in hand. if you don't have documents, contact the person or company that should have given you the 1099 and get that information over the phone immediately since the filing deadline is tomorrow. Ask them to follow up by mailing or faxing you the documents you need. If there is a significant difference in the return you file by the extension and what you discover after October 15th, you can submit an amended return and pay the difference or claim a refund. You can prepare an amended return with Turbo Tax or manually, but in either case, you must file a paper amended return and mail it in.
