Something probably changed if your tax due or refund amount changed significantly from the previous year. I suggest you compare the numbers on your tax return form 1040 this year to last year's numbers.
Your income would appear on line 9, see if it is much different from last year. If so, look on the numbers in the column above it and see which income items are different from last year.
Your total tax is on line 24. Again, compare that with last year and look at the numbers above it to see what may have changed. Also, look at line 25(d), which is your tax withheld. Compare it to last year to see what changed.
When you find where the differences are, that may enlighten you as to why your tax due is different from last year.
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