Capital gains tax question

My husband and I are selling our primary residence of 13 months. We are not selling because of employment change or any other 'good reason'. We bought our home for $93000 and have sold for $129,900- roughly a $30,000 gain. We are married and together make less than $75,000 (15& tax bracket). Can someone explain whether or not we will have to pay a capital gains tax, and if so, how much it would roughly be? I have done research but have gotten mixed information.