This information is not provided to TurboTax. You would have to call the IRS at 800-829-1040 to see why they made a change. This can happen for reason such as to them having information that does not match what you entered so they make a correction. This can occur due to an entry error or missing W-2 or 1099 that they received that you did not enter on your return. It can also occur because of a refund offset, or an adjustment to a credit or deduction you claimed.
Video: Reasons Why My Tax Refund Is Not What I Expected
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