IRS: Roth IRA conversion at any time during the year -tax is due when in the quarter the conversion happened based on estimated total income for the year. Proper updated 1040-ES vouchers are needed. This makes a mess.
FIDELITY: The federal tax on a Roth IRA conversion will be collected by the IRS with the rest of your income taxes due on the return you file in the year of the conversion. All of the due Roth IRA conversion tax is due April 15. This would make it possible to optimism stock performance with rollover and save tax.
