@gameplayer21!! TurboTax cannot catch every possible user error. The software has no way to know if you leave out income, enter an amount incorrectly, make a typo, or enter something in the wrong place. The software does its calculations based on your data entries, and you are supposed to check over your own entries for accuracy. Lots of people made mistakes on 2020 returns especially with the recovery rebate credit. If your refund was reduced by the IRS then in several weeks you will get a letter from the IRS that explains why they reduced your refund.
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