Ans: E-way bills can be generated by taxpayers when they generate an e-invoice. However, they can generate an e-way bill at a later time as well. It is necessary to submit an e-invoice with the e-way bill in order to ensure the validity of the e-way bill. It is often believed that the e-way bill has been rendered obsolete since e-invoicing was introduced, but that is not the case. It is a very important document when transportation of goods takes place and e-way bills are required.