"worked more this years" , by it's self,means your total federal tax (and most likely your refund) is going to change.
To preview your federal tax result, try this tool:
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?s=1 I suggest you lay last year's return next to this year's and do a line by line comparison to see what's changed. Otherwise you haven't provided enough info for anyone to answer your question. In the on-line version of TurboTax, the main Form 1040, 1040A or 1040EZ can be seen through Tools, View Tax Summary, Preview My 1040 or go to Print Center and then choose to Preview.
It depends on many variables: the biggest are
1) how big your AGI is
2) filing status
3) how many dependents you have.
4) what deductions and credits to you qualify for
5) withholdings
In particular, the Earned income credit is on steep bell curve. On the up slope less income means less EIC. On the down slope more income means less EIC. See
http://www.taxpolicycenter.org/briefing-book/key-elements/family/eitc.cfm