You could be in more trouble if you don't, assuming that you rented the space for at least 15 days in 2012. You are required to report that income on your tax return. Furthermore, AirBnB is required to report it to you and to the IRS (which will then be looking for it on your return) when the amount that they pay you is $600 or more. I strongly recommend that you consult with a tax professional before you file your return. If you personally used the space you rent on AirBnB for more than 14 days or 10% of the number of days you rented it (whichever is greater), you are considered to be renting your personal residence and your ability to take deductions against the income is limited. Furthermore, the method that you use to report the income and expenses depends on whether or not you are renting to make a profit - see Publication 527 (2011), Residential Rental Property for more information.