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Roth conversion can spike upfront taxes and Medicare costs at age 63
A one-time Roth conversion using Vanguard’s calculator would mean a $160,000 upfront tax bill for a couple with a $1 million IRA and $100,000 other income, potentially pushing them into the highest IRMAA surcharge bracket later.
Moneywise and Yahoo Finance, citing Vanguard and Medicare rules, warn that Roth conversions can be costly when savers convert too much at once, because the conversion triggers ordinary income tax in the year it happens.
The article describes the core tradeoff: taxpayers pay ordinary income tax on dollars converted, but only in the conversion year. It cautions that converting the full amount up front can magnify the tax bill and may trigger additional surcharges.
As an example, a couple aged 63 planning to retire with a combined $1 million in an IRA and $100,000 of other income would face a $160,000 upfront tax if they converted the entire IRA to a Roth IRA at once, according to Vanguard’s online calculator mentioned in the story.
It also links large conversions to Medicare premiums through IRMAA. The piece says that because IRMAA uses a two-year lookback, a conversion at age 63 would place the couple into the highest surcharge bracket at age 65, adding $689.90 per month for Part B and $91 per month for Part D for that year, per the Medicare guidance cited.