This sandbox shows how Roth conversions or IRA withdrawals can cause more Social Security benefits to become taxable, creating a higher effective marginal tax cost than the stated bracket alone.
--Estimated Additional Federal Tax On Social Security--Additional Social Security Made Taxable--SS Tax As % Of Conversion--Social Security Taxable After Conversion
Conversion Planning
Social Security Conversion Thresholds
Maximum conversion without more taxable Social Security--
Milestone
Combined income
Conversion from baseline
These are Social Security taxability thresholds, not tax rates. The conversion itself can still be taxable. Amounts start from baseline AGI, before the planned added income.