My ex-employer did not take out FICA. I want to pay my portion of FICA now and not get audited later. How can I do this? Online?

[Lisa995]

You have a W2 with no SS taxes withheld?  Not all types of employers are required to collect SS, some have their own type of retirement (like teachers).

Or do you have a 1099MISC?  If so, when you fill out your SchC reporting that self employment income, you'll be paying self employment taxes (thats the same as FICA)