QUESTIONS: (a) Is there a possibility the IRS is incorrect and that we are also entitled to the other $600.00 as TurboTax calculated on 15 February 2021? The IRS is asserting that the $600 was mailed to you so you cannot have it on the return as a credit. So you will need to initiate a TRACE on that payment. See the third + here: https://www.irs.gov/coronavirus/second-eip-faqs
It says please mention Reference Number 9021 to the IRS Customer Service Representative.
9021– Reference Code for all math error conditions.
Note that a "math error" can occur if you make a data entry mistake, or forget to claim some income; and thus the refund amount is incorrectly calculated.. The IRS will be sending you a letter. They do not notify TT.
(b) After the $1203.46 is in our bank account, should I file an Amended return for the 2020 tax year, changing Filing Status from "Married Filing Jointly" to "Married Filing Separately" so that I, the U.S. Citizen, receive the other $600.00 USD? That will not work AND you cannot switch from MFJ to MFS after the due date of the return. And the $3.46 is interest for taking too long to process the return ... it is taxable income on the 2021 return.
(c) Was TurboTax correct in calculating a total refund of $1800.00 USD, or, is the IRS correct in disallowing the $600.00 USD? TT calculated it based off what you entered ... but the IRS disagreed with the amount you said you got in advance ... again initiate a trace.
Mail from the USA is not delivered to our house so any mail the IRS sends to me will never arrive here. Then you best fix this ... the IRS should always have a place on file to send you mail. If the address you had on the last return it not good then mail in a form 8822 to update the address. https://www.irs.gov/pub/irs-pdf/f8822.pdf
