Hello @macos08,
You claimed a dependent on your 2020 return? If so, did you receive a Recovery Rebate Credit for the dependent on your 2020 return? You can check by looking at your 2020 Form 1040, line 30.
The first two payments of $1,200 and $600 are correct. Since you were single and did not claim a dependent on your 2019 return, then you should have received those two amounts. If the dependent that was claimed on the 2020 return was born during 2020, then you should have received $500 for the first stimulus and $600 for the second stimulus as a credit on your 2020 return.
The third payment of $1,800 is a little confusing. My best guess is that this is your third stimulus payment of $1,400 plus an additional $400 for the dependent (possibly the $400 amount was left off your 2020 filed return?). The final $1,400 payment is most likely the 3rd stimulus payment for the dependent claimed on the 2020 return.
Regarding paying back any stimulus overpayment, the IRS explains "If you believe you received more than one first Economic Impact Payment (EIP) make sure that one is not:
- Your tax year 2019 tax refund or an interest payment on a tax refund. Check the refund amount on your Form 1040 or 1040-SR for tax year 2019.
- Your unemployment compensation payment. Some states are issuing back payments in a single check or direct deposit.
- A payment for someone else in your household. For example, you may have a family member who receives federal benefits or has an adult child who shares your name or bank account may have received their own first Economic Impact Payment.
- A catch-up first Economic Impact Payment for a qualifying child or injured spouse.
- A second Economic Impact Payment.
The IRS mailed a Notice 1444 to each individual who received the first Economic Impact Payment. The notice includes the recipient’s name and the amount received.
If, after checking the items above, you believe you received a payment in error, return one of the payments using the instructions in the FAQs about returning an Economic Impact Payment."
Link: https://www.irs.gov/newsroom/questions-and-answers-about-the-first-economic-impact-payment-topic-d-r...
I would recommend checking Notice 1444 that the IRS sent out regarding Stimulus payments. This notice should have a breakdown of the amount of stimulus payments you received. If your recovery rebate credit on your 2020 return is $1,100, then you should only have received an additional $1,400 for the dependent.
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