Notice CP504B is not the first notice that you received. There must have been an earlier notice that told you what was wrong in your tax return, and several mor...
After you finish entering your gambling winnings in the income section, continue through the screens. You will come to a screen that asks you to enter your gamb...
If you file a tax return you have to include all of your income, including "a little gig money."
If "a little gig money" is $400 or more you are required to fi...