30 October 2013
file your income tax return in ITR4 . . commission income can be disclosed as per 26AS in profit and loss statement . . as you said you dont have taxable income you ca get refund . . so file return asap
31 October 2013
If your income is under exemption limit, You can File Income tax return.. For the F.Y 2012-2013 you have to file belated return.... and you can claim your refund...
31 October 2013
if the TDS has been deducted in September 2013, then the financial year shall be FY 2013-14, AY shall be 2014-15.
You can file tax return (in case of individual with less than Rs 1 crore total income) upto 31 July 2014. Once you file the return, it shall be processed by the Income-tax department and refund, if any, shall be given.