if the company is not paying the IRS your SE tax and withholding, they're not going to be swayed by your threats of reporting them.
if you don't get a W_2 by February 15. you're supposed to contact the IRS for instructions.
That would probably not be possible now.
instead Use Form 4852, Substitute for Form W-2, Wage and Tax Statement, if you don't get your W-2 in time to file.
