Partner - Audit & Assistance
4825 Points
Joined December 2018
Condition for 12% with ITC - Provided that GTA opting to pay central tax @ 6% under this entry shall, thenceforth, be liable to pay central tax @ 6% on all the services of GTA supplied by it.[NN 20/2017-CTR dated 22nd Aug 2017]
There is no mention of beginning of financial year. Therefore, once you charge 12% you would be required to charge 12% going forward and eligible on ITC.
Please refer section 18(1)(d) on taking credit on stock in hand and CG as on date of shifting to 12% with ITC.
Hope this helps