Look at your 1040 line 15, that is your taxable income.
Look at your 1040 line 16, that is your tax.
How do these numbers look compared to last year?
Now look at the additional taxes and any credits that changed.
Last, look at what you had withheld from your income.
There are many pieces to the tax return, so it's difficult to narrow it down to just one thing.
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