This is how to claim it, so if you already claimed and got the tax treaty you don't have to do that. And you should read it again. If you are working as a student with F-1 visa, you don't need to file the 8833 form.
You do not have to file Form 8833 for any of the following situations:
- You claim a reduced rate of withholding tax under a treaty on interest, dividends, rent, royalties, or other fixed or determinable annual or periodic income ordinarily subject to the 30% rate.
- You claim a treaty exemption that reduces or modifies the taxation of income from dependent personal services, pensions, annuities, social security and other public pensions, or income of artists, athletes, students, trainees, or teachers. This includes taxable scholarship and fellowship grants.
