Suitable ITR for Commission or Brokerage Income

ITR 2

ITR 3 ONLY

If income of brokerage or commission earned through any business then ITR 3 will be filled.
But if brokerage or commissions earned through any other source then ITR 2 will be filed.

ITR 3 is suitable for Your query...

If the income from brokerage is one time and/or casual in nature (some time it may be there and some time it may not be there) then it needs to be considered as income from other sources and ITR1/2 shall be most suitable.

However, if the income from brokerage is going to be substantial, every year and year after year, then such income shall fall under income from business and Profession and ITR3 shall be suitable.