No. Income averaging is limited to certain lump-sum distributions from qualified retirement plans. There is no income averaging for IRA distributions or income resulting from a Roth IRA conversion.
Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.