One of my new client provide contract services to goverment department. He received the Payment every month from Central Goverment department after deduct the gst tds. But the problem is. we are going to file the GSTR1. But in GSTR 1 ,B2b colum is not accepted the GSTIN becouse the Central Goverment department having GSTIN is TAN based instead of PAN base. 1. what is the solution of this problem ? 2. Is GST rate for Central goverment department is 12%? if same item is purchase in 18%. 3. what kind of charges deducted by Central Goverment at the time of payment ?