S-CORP how to request refund of employer portion of excess social security tax withholding refund

Hi,

I have a temporary W-2 JOB (Primary JOB with different employer). It maxed out to SSA cap $147,000.00 and both employee/employer taxes withheld to max. Now I have my own S-Corp which I work for my self on project based (seasonal job). I pay myself salary. Since I maxed out SSA withholding from my Primary JOB employer, do I still needs to withhold social security tax for my S-corp?  I know employee excess social security will be refunded. But How can I get S-corp employer portion excess social security tax? Or should I not withhold Social Security Tax for S-corp?