As per section 18(1), credit of inputs can be availed for pre transition period in following cases :
- Compulsory registration is applied with in 30 days from being liable
- Voluntary registration
- Exempted goods become taxable. Also entitled to credit for capital goods
- Swithcing from Composition to Normal Scheme. Also entitled to credit for capital goods
However the availment of credit is subject to filing GST ITC-01 providing the detail of inputs and capital with in 30 days from above transitions. However since GST-ITC-01 is not still available on the portal, the date for filing ITC-01 has been extended to 31-10-2017