Not-for-Profit Activities(p40)

If you do not carry on your business to make a profit, there is a limit on the deductions you can take. You cannot use a loss from the activity to offset other income. Activities you do as a hobby, or mainly for sport or recreation, come under this limit.

For details about not-for-profit activities, see chapter 1 in Publication 535, Business Expenses. That chapter explains how to determine whether your activity is carried on to make a profit and how to figure the amount of loss you can deduct.