Without looking at your return it is impossible to know why.
These are the most common things that effect your refund or balance due:
- Different Filing Statuses;
- Dependents claimed;
- The amount of federal and/or state withholding;
- Income based credits, such as the Earned Income credit;
- Tax bracket changes
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That is not even close to being enough information to answer you. You have not told us your filing status, whether you have dependents, what credits/deductions you qualified for, how you earned your income (self-employed or W-2?) , how much was withheld from your pay........etc.etc...