Any transaction above some amount(e.g.INR400) should be made mandatory to be non-cash based for electronics items, e-com Cash-On-delivery,  airfare, multiplex from 1 Jan 2017 onwards.

Today many corrupt ones & tax-evadors, do a lavish spending of their black money in misc. luxury expenses. Major enforcable components include buying electronics products, Cash-on-delivery from ecom portals, mutliplexes, holidays, restaurants, super-markets, malls, property registration stamp-duty.

If you feel what impact it can have… take a glance at annual revenue of these industries.
- Indian Electronics industry revenue: ~2 Lakh Crore in 2014 (info_source)
- E-com cash on delivery revenue: 45% of 2.5 Lakh Crore in 2015 (info_source)
- Indian film industry revenue: ~8000 Crore INR in 2014 (info_source)

This will
- Further cashless economy, to huge % of transactions, value wise
- make it difficult to spend black cash money on luxury expenses.
- Some people may be well off but not in formal banking out of inertia. This enforcement will give 2 cents of reason to people to use formal banking.
- Very minimally impact to poor people, who cannot handle cashless means.