Get your taxes done using TurboTax

Your worldwide income is subject to reporting and tax in the United States.  There does not appear to be any language in the US-Romania Tax Treaty that provides any relief from taxation in the United States from these payments.  Therefore these payments would be reportable and taxable in the US.  You can report it in TurboTax as Wages and Income, Less Common Income, Other Miscellaneous Income, Other Taxable Income:

You can also consider making estimated tax payments for both Federal and State tax liabilities. 

If your Romanian payments will continue throughout 2021, you can multiply the amount of the payments by your effective tax rate and make payments at www.irs.gov/payments and your state tax website.