Not Using OPT or Ending OPT Early
If you decide not to use your OPT after it's approved or to end it early, you must inform ISS so your SEVIS record can be completed. Once your SEVIS record is completed, you no longer have valid F-1 status in the U.S. and will not be able to use your EAD card and I-20 for employment or re-entry to the U.S.
When you leave early and your record is completed, you forfeit all (or the remainder) of your OPT. You will not be able to use it again at a later date. If you fail to report your departure and accrue more than 90 days of unemployment, your SEVIS record will be automatically terminated by SEVP.