Yes. Filing Income Tax is mandatory for all companies and firms across the country. All individuals, HUF, AOP, and BOI, should submit the ITR if their total earnings are more than INR 2.5 lakh. Check the income tax slabs for the current financial year before you file the ITR.
Yes. Individuals can voluntarily file ITR even if they do not fall in the taxable bracket.
You do not have to submit any documents with your Income Tax file. However, ensure that you are retaining the income proofs if they are needed by any authority in the future.
Yes. It is necessary to include all your earnings when filing the ITR (including the exempted amount).