L1 visa tax questions

Hi,
I am a marketing manager here working on a L1 visa. I get a allowance of $100.00 per day towards my expenses. There are no taxes being deducted on it. Apart from this I dont get any wages/salary.
Question : Is the employer supposed to pay some minimum salary to me??

Question:Is employer supposed to pay FICA taxes on those $100.00

Question: What if he doesnt pay those taxes?? would it affect me if I file for green card or so???

There are some tax provisions and estimates necessary in your particular compensation arrangement.

If you are interested in discussing this further please contact me at mekafinancial@aol.com or 609-613-9777.