Transition Form 2 or TRANS-2 is filed by those registered taxpayers who are eligible to avail the credit in Electronic Cash Ledger with respect to eligible duties and taxes earlier paid on the inputs under the pre-GST regime. If the taxpayer does not have the invoice or any other document as an evidence of the tax paid, then he needs to declare the same in TRANS-1 followed by the filing of GST TRANS-2.