How Much to Convert to Roth IRA

Fill the bracket, mind the IRMAA line: the framework for sizing your annual conversion.

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Quick answer

A common strategy is to convert only enough to fill your current tax bracket without spilling into a higher one or crossing a Medicare IRMAA threshold. The right amount depends on your other income, deductions, age, and timeline, so most people convert in measured annual amounts rather than all at once.

There is no one-size-fits-all number. Here is the framework retirees use to decide how much to convert each year.

How do I decide how much to convert?

The most popular method is bracket filling. You estimate your taxable income for the year, identify the top of your current tax bracket, and convert just enough to reach that ceiling without crossing into the next bracket. This captures conversion at the lowest possible rate. Layer in two guardrails: avoid crossing a Medicare IRMAA threshold, which adds Part B and Part D surcharges two years later, and avoid sharply increasing the taxed portion of your Social Security. The result is usually a series of moderate annual conversions rather than one large move.

What factors change the right amount?

Several variables shift the ideal figure. Your age and years until RMDs determine how many low-income years you have to spread conversions across. Whether you can pay the tax from outside the IRA matters, since paying from the IRA shrinks growth and may add penalties. Your expected future tax rate, the size of your traditional IRA, and your heirs' tax situations all play in. Because so many pieces connect, including Medicare premiums, call 1-800-MEDIGAP at 1-800-633-4427 to understand the Medicare side, then finalize amounts with a tax professional.

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Frequently asked questions

How much should I convert to a Roth IRA each year?+

A common approach is converting just enough to fill your current tax bracket without entering a higher one or crossing a Medicare IRMAA threshold. The exact amount depends on your other income, deductions, age, and timeline, so it varies year to year and person to person.

Should I convert my entire IRA at once?+

Rarely. Converting everything in one year usually spikes your income, pushes you into a higher bracket, and can trigger Medicare surcharges and more Social Security taxation. Spreading conversions over several years almost always costs less in total tax.

What is bracket filling for Roth conversions?+

Bracket filling means converting only the amount that brings your taxable income up to the top of your current tax bracket, no further. It captures conversion at your lowest available rate and avoids paying the next bracket's higher rate on converted dollars.

How does Medicare limit how much I convert?+

Medicare IRMAA surcharges kick in once income crosses certain thresholds, adding to Part B and Part D premiums two years later. Many retirees cap conversions just below the next IRMAA tier. Call 1-800-MEDIGAP at 1-800-633-4427 to understand where those lines fall.

Does paying the conversion tax from my IRA change the amount?+

Yes. Paying tax from the IRA itself shrinks the amount that grows tax-free and, if you are under 59 1/2, may add a 10% penalty. It is generally better to pay conversion tax from outside funds, which also lets you convert more efficiently.

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