Is it better to do one big Roth conversion or several smaller ones?

Spreading conversions over several years is usually smarter than one large conversion. A single big conversion can push you into a much higher tax bracket, spike your Medicare premiums two years later, and increase taxation of Social Security – all in one painful year. By converting smaller amounts annually, you can 'fill' the top of a lower bracket each year and keep the average tax rate down. This multi-year approach works especially well in the gap years between retiring and starting Social Security or RMDs, when your income may temporarily dip. The trade-off is discipline and planning, since you're committing to a multi-year strategy. Always pay the conversion tax from non-retirement funds so your full IRA balance keeps compounding tax-free. Plan the yearly amounts at wealthserene.com/tools/roth-conversion.