Advance ruling on GST clarifies classification, applicability, timing, valuation, credit, liability and registration consequences. An applicant may obtain an advance ruling by applying in the prescribed form and manner with the prescribed fee; allowable questions are limited to classification of goods or services, applicability of notifications, determination of time and value of supply, admissibility of input tax credit, determination of tax liability, registration requirement, and whether a particular act amounts to a supply within the meaning of the law.