Yoga instructor Ramdev's trusts and similar other institutions engaged in promoting yoga are not required to pay the service tax for a period, starting from June 20, 2012 to October 20, 2015, provided they are registered as charitable entities. For period after October 20, 2015, Yoga-promoting institutions has come under the negative list which are exempt from the service tax. There was confusion whether service tax is applicable to yoga-promoting institutions or not before October 21, 2015. This was so because negative list of services issued witheffect from June 20, 2012 did not specifically mentions Yoga.

Source - http://www.business-standard.com