19 January 2014
tax returns need to be filed annually. Due dates are declared every year. for last year in non-audit cases it was 31 July extended by 5 days..for audit cases it was 30 sept...for transfer pricing cases it was 30 nov.
you can file online return at https://incometaxindiaefiling.gov.in/
where TDS credit is less than tax liability, you need to pay taxes before filing the return. you can pay taxes here