When by law are previous employers required to send out 1099 forms to former emmployees

A 1099 is not for employees, but for contract workers,

Or self employed people. So an employee of a company would not be getting a 1099 but would be getting a W2.

Form 1099s get sent out in mid-February!

When by law are previous employers required to send out 1099 forms to former emmployees

Deadline for employers to mail out Form W-2 Income for 2012 paid to employees and businesses to furnish Form 1099 statements reporting income to independent contractors or non employees for year ended 2012 is...
And
Deadline for self-employed individuals to file and to pay their tax and avoid an penalty for not making your 4th quarter estimated tax payment is...

February 15, 2013

RenelMiller0120:

Now you are answering a FIVE-year-old post, an answer no one will read because, by now, they are past caring.