W-4 for correct tax withholding

Hello, 

Last tax year, my husband and I owed on our taxes.  That has never happened to us before and we want to make sure the correct amount is being withheld.   We both work and have one dependent.  On my husband's W-4 we have box c checked for step 1 & 2.  My husband has the higher paying job, so we have $2000 on step 3 for him.  This step has 0 for me.  Will the correct amount now be withheld from our pay checks, or do we need to have extra withheld?  If so, how do we calculate that?  I am worried that something is still wrong because my husband currently has less taxes being taken out of his check than I do.  

Thanks.