Provisional assessment in GST permits provisional tax payment against a bond and security, subject to later adjustment and interest. Provisional assessment in GST allows a supplier unable to determine value or rate to request provisional discharge of tax; the proper officer may permit provisional payment by issuing an order specifying provisional value or rate and the provisional tax for which a bond and security must be furnished. After bond execution the supplier may pay tax provisionally; the assessment is finalised within a prescribed period, adjusted against final liability, with shortfalls payable with interest and excesses refundable with interest, and security released after finalisation and settlement.