I took RMD with no withholding ,can I add something more to my Jan EST return above what is already expected

[sailsal84]

can I send more than original estimated tax voucher

[DoninGA]

Yes, you can increase the amount of the estimated tax payment on the voucher.  Make sure that is mailed on or before January 17, 2023.

Or you can use the IRS payment website with Direct Pay for the 2022 estimated tax payment - https://www.irs.gov/payments

[NCperson]

@sailsal84 yes, to be conservative, take the Conversion Amount times your tax bracket to estimate the tax due to the Conversion.