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Currently 85% of SS is taxable at whatever rate applies to your income. (Unless you are low enough income that no taxes apply).

To determine what proportion of your SS is taxable, you take half the SS and add your taxable income plus interest from Muni bonds. The 85% breakpoint is above $34K for MFJ. By converting a portion of my IRAs to Roths now, and paying 22% federal income tax, I should be saving ~$4K-5K in taxes on my SS later. That's because the Roth money will not be taxable income.

Based on the simulations I ran, I can maximize the SS that's subject to tax at 50% rather than 85%. Of course, that's if the rules stay the same, etc. But, if tax rates go up (or bracket floors go down), that strategy will save even more in addition to just the taxes applied to SS.
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