The foreigner needs to have proper work pass requirements (see previous FAQ) before allowed to work in Singapore. For an internship / traineeship under the trainee or student pass visa, no foreign worker levy payment needs to be paid, and no foreign quota restriction is in place. Foreign levy and quota only applies to S Pass and Work Permits holders, which does not apply to trainee or student pass interns as they are only undergoing training in your organisation as part of their curriculum. For more information on levy and quota, please see the MOM website here: http://www.mom.gov.sg/passes-and-permits/work-permit-for-foreign-worker/foreign-worker-levy/what-is-the-foreign-worker-levy