..

Other reasons why you refund might be lower this year:

• You did not qualified for the full amount of the Child Tax Credit. If you don't have any Tax liability you will only receive the additional Child Tax Credit. 
• You didn't qualify for the Earned Income credit. When you qualify, the credit amount will go up as you earn more income, but once you earn too much, it will go down eventually to zero. TurboTax will figure out exactly how much you’ll receive. 
• Number of dependents claimed this year.

 I recommend that you make a line by line comparison between this year and last year's return to see what changed this year.

.....