If you get a refund every year and you expect a refund this year, then you don't actually need to file an extension.  There are no penalties for filing late when you have a refund.  

Thank you...I am sure we will get a refunded as we have 5 children have never paid. So I dont need to file an extension?

If I don't file an extension for my federal will my state be affected? I have a very small amount of income less than $1300 when I traveled for my company for a week. Do I need to file an extension for the state of MA?