GST on reverse charge basis on legal services

Yes. It is taxable under reverse charge. You can take credit to the extent used for making taxable outward supplies

Any services provided by lawyer in capacity of lawyer is fall under RCM u/s 9(3).& as per Notification 13/17 CT rate RCM attracts

Not taxable outward supply but for the purpose of business and to the extent utilized.

Dear Suraj

In addition to my reply:
As per S.no. 45 under Notification 12/2017 CT Rate :
Advocate services provided to Unregistered person or to Business entity whose aggregate turnover is below 20 lacs is exempted. So in where the recipient is Unregistered its cover under Exempted Supply ', Hence NO RCM.