It really depends on the type of 1099. if it's a 1099-INT, I would call the credit union or bank or whomever you have the account with and get the correct amount. it's then ok to file. I would not try and file if I was waiting for a 1099-B where sale of assets were involved.You must have an idea of the 1099's you are waiting for, so I would call the company and find out what is holding them up.You can file without having the 1099 but be prepared to amend if you receive one after filing and it does not agree with the information on your return.
