Hi,

I graduated with a Master's degree and have been working on OPT since June this year; however, my F-1 Visa has expired and HR has listed me on a AE (Authorization for Employment document) status in the system and I have been charged FICA taxes even though as far as I understood from you forum (very helpful indeed!) is that foreign workers on OPT are exempt from those.
I have been approved for H1-B starting October 1st, and I expect to be liable for these taxes starting then; however, given my case should I request a refund for the sum which is being withheld from my paycheck so far?

Thank you very much for your help

The FICA (Social Security and Medicare) tax exemption applies specifically due to your F-1 (or J-1) visa status.

If you do NOT have the protection of the F-1 visa status (as indicated in your post), then the default position of the IRS is that you ARE liable for FICA tax withholding.