After you file

@NCperson 

Thanks again for your help and quick reply.  Form 1040:

 

Line 28: Refundable child tax credit or additional tax credit from Scheduler’s 8812 is blank

Line 30: Recovery rebate credit is blank

 

If you meant lines 4a-b, 5a-b, 6-b on Form 1030, those are blank. 

If you meant lines 4-6 on Scheduler’s 8812 , those are blank as well. 

 

“Trying” to answer your question about what line numbers generate 1,400 .. on Form 1040, ***Line 23*** “Other taxes, including SE tax, from Schedule 2, line 21” shows 1,400. 

 

I’m assuming that’s the problem line? Because in the IRS letter, they show payment I made which is line 24, tax I owed which is line 22 and that difference is 1,400 … which looks like it was added from line 23.