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If I helped my friend to file taxes; can I represent her on a phone call with FTB?
In order for you to be able to talk to the FTB on someone's behalf, that someone has to submit form 3520. Note that since you're not a professional, this form must be paper-filed (CRTP, EA, CPA or attorneys can have this filed on-line). Once the form is accepted by the FTB, you can contact the FTB on behalf of your friend. Pay attention: you're going to represent the partnership, not the individual.