Just received letter from IRS for 2021 Form 1040SR, stating we owe $2,900 additional tax. Reason given: "amount shown on Schedule 2 of your tax return as additional tax from Schedule 8812 . . . because you received advance Child Tax Credit payments and either didn't reconcile them or made an error on Schedule 8812" in 1 of 3 areas: computation on 8812, reconciliation of advance Child Tax Credit payments, or transferring amount from Part III to tax return. Third reason does not apply, first reason seems unlikely due to use of TT. We have 1 child, $2,900 max child credit, we received $1500 (me $750, wife $750). Line 14i shows $1400, that also appears on 1040 line 28 (line 19 is blank). 1040 Sch 2 line 19 is blank. Checked bank statements and no other payments were received. I have either entered something wrong in TT or missed something, but I can't figure it out.
