Employer's contribution to social security and medicare

My son is the sole cook of a restaurant.  He will not be getting a W-2.  He wants a 1099 form from the employer that shows the employer's contribution to his social security and Medicare.  The employer is hesitating and may not provide a 1099.  If the employer does not provide a 1099, what is my son's obligation for social security and Medicare on his income tax return as a percent of his gross income?  Is it 7.65% (6.2 + 1.45)?  What form must he use to report his income in this situation?  Should he report his employer to the IRS for not providing a 1099 form?