Many taxpayers (and not just TT customers) made errors of this type. TT goes by your data entry, and answers to questions. If those are wrong, the IRS calls it a "math error."
As of April 7, the IRS had issued 9.4 million math error notices – and 8.3 million of these notices were related to the recovery rebate and the child tax credit.
IRS 'Where's My Refund?' tool offers little help for some taxpayers (usatoday.com)
