Oh, that's a no-no. You shouldn't do that; it's too risky. You could end up with a mess to straighten out.
You must wait on any W-2's, 1099's, etc. to arrive
first before filing. If you file before you have all your
information, you risk having to amend your return later. Your employer is required to furnish you a W-2 by the end of January, but often it will be available before then. Some employers or payroll companies have a website to download the W-2. And TurboTax can import the W-2 from some employers, once the company has released the W-2 information.
There's
no hurry to file now. The IRS will not start processing returns until
January 23 (except for a few test returns the IRS will pull
early.). Any returns efiled early will just sit on TurboTax servers
until then and cannot be retrieved if you notice something wrong or
receive additional tax forms. You'd later have to file an amended
return, which is a hassle.
And starting this year, if you have EIC (earned income credit) or ACTC (additional child tax credit), the IRS will not start releasing those refunds until February 15.