Turnover limit in gst

There is no such restriction. Please provide me the reference from Act or Rules.

As far as I know, that 2.5 lakhs criteria is for reporting purpose in GST monthly return. Means if you made any sale of more than 2.5 lakh to any customer, then you have to report it invoice wise in the return, if it is less than 2.5 lakh then show only the aggregate amount of sale to all customers in the return.

Mr Ali is correct. This limit is applicable in reporting in GST Returns.