That is a pretty broad question, there are many factors to a tax return.
First, I would point out the Child tax Credit. Did you receive advance payments that makes your tax seem higher?
Compare your 2021 Adjusted Gross Income on your 1040 Line 11 Taxable Income on Line 15 and TAX on Line 16 to 2020 to get a better idea of where there is a difference.
If those amounts are close to being the same, the difference may be a credit which would be reported on the lines that follow.
TO LOOK AT YOUR 1040 USING TURBOTAX ONLINE:
Click "Tax Tools" on the LEFT SIDE BAR then click "Tools" which shows open below
Click "View Tax Summary" on the screen
Click "Preview my 1040" which now appears on the LEFT SIDE BAR
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