The extra tax payment you paid in December 2019 would be reported on your 2019 tax return. You always report the taxes paid in the year you paid them.
You may also want to amend your 2018 return since the 2017 refund increased your 2018 income. By amending your 2018 return, you may be entitled to a refund if you paid additional taxes as a result of reporting the 2017 taxable refund on your 2018 return.
Please see this TurboTax Article for more information on amending your 2018 tax return.
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