Registered person supplying exempted goods, which invoice to be issued?

Answer  - A registered person who is supplying exempted goods or services shall issue Bill of Supply. He should not issue tax invoice as he is supplying the exempted goods/service which are not liable to tax. Also, if the person is registered under Composition Scheme, he shall issue Bill of Supply instead of tax invoice. 

Although if the person is supplying only the exempted goods or services, he is not required to take registration. 

If such registered person purchases from an unregistered person he needs to issue a payment voucher as well as a tax invoice.