I am answering to your question with the UNDERSTANDING that you are liableas per Income Tax Act 1961 of Republic of IndiaIf you have online source of Income as per agreement as an employer -employee, It will be treated SALARY income and you will file ITR 1 for FY 2017u201318If you are rendering professional services outside India with an agreement as professional, in that case you need to prepare Financial Statements ie. Profit and loss Account and Balance sheet for FY 2017u201318 , finalize your income and pay taxes accordingly, You will file ITR -3 for FY 2017u20131831st Dec.2023 is last due date with minimum penalty, grab that opportunity and file income tax return as earliest