Employer witheld FWT, MCARE, SWT, and SDI, no FICA deductions, how do I figure what we should pay the IRS?

Update: The employer informed yesterday me that he failed to withold FICA for the year and a half I was employed and that I would have to pay the IRS.
Update 2: chatsplas: not sure why, He just informed me, and he said it was FICA. I claim married and one on my w-4 and claim 3 when I file my taxes. Yes I did recieve a large refund for 2009. I have one dependent child believe I did get the child tax credit.
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