Dear Sir,
Hope you are doing well !!
For the ongoing projects, builders have been given the option to either continue in 12 per cent Goods and Services Tax (GST) slab with ITC or opt for 5 per cent GST rate without ITC.
“Ongoing projects” means projects where construction and actual booking started before April 1, 2019, but which was not completed by March 31, 2019.
In your case, the new rate is apply only if bulider had opted the option of new rates.
Please check the same with builder.
Otherwise, you will be liable to pay GST as per old rates.