Picture a 64-year-old who started Social Security at 62 to fill gaps in her budget. She has a traditional IRA she wants to trim before required minimum distributions (RMDs) begin at 75, and her advisor mentions Roth conversions. Then she reads that Social Security can withhold benefits when someone earns too much before full retirement age.
If she converts $40,000, will the government pause her checks? No. A Roth conversion cannot trigger the retirement earnings test. It can, however, make more of the Social Security she already receives taxable.
Why the Earnings Test Ignores the Conversion
The retirement earnings test counts wages from a job and net earnings from self-employment. A Roth conversion is neither. No employer paid it, no client hired her, and no Social Security payroll tax applies to it. The same general rule covers traditional IRA withdrawals, pensions, interest, dividends, and capital gains. Those forms of income may create income-tax consequences, but they do not cause Social Security to withhold retirement benefits under the earnings test.
Our retiree could convert $10,000 or $100,000 without losing a monthly check for that reason. That is the reassuring half of the story.
The Tax Bill Hiding Behind the Good News
The pretax portion of a Roth conversion enters ordinary taxable income in the year of the conversion. If the IRA contains nondeductible contributions, the calculation becomes more complicated because part of the conversion may represent after-tax basis. The taxable portion also enters the formula used to determine how much Social Security is taxable. That formula, commonly called combined or provisional income, generally includes adjusted gross income, tax-exempt interest, and half of annual Social Security benefits.
For a single filer, benefits can begin becoming taxable once combined income exceeds $25,000. Above $34,000, up to 85% of the benefit may enter taxable income. For married couples filing jointly, the corresponding thresholds are $32,000 and $44,000. Up to 85% taxable does not mean Social Security faces an 85% tax rate. It means as much as 85% of the benefit is added to taxable income and taxed at the person’s regular rate.
What a $40,000 Conversion Can Do
Suppose our single retiree receives $22,000 from Social Security and a $10,000 pension. Before the conversion, her combined income is approximately $21,000: the pension plus half of Social Security. Her benefits may remain untaxed. Now assume she converts $40,000 of entirely pretax IRA money. Combined income jumps to roughly $61,000. That can make as much as $18,700, or 85% of her $22,000 benefit, taxable in addition to the conversion and pension income.
Her Social Security deposit does not change. The IRS simply reaches more of it when she files her return. A second bill may arrive later. Because she is approaching Medicare age, the conversion could raise her Part B and Part D premiums approximately two years afterward through the income-related surcharge. That belongs in the calculation even though it does not affect the Social Security earnings test.
How to Plan the Conversion
Timing and size do most of the work. The cleanest conversion years are often those after wages stop but before Social Security begins. That window has already closed for her, but smaller conversions spread across several years may create less tax damage than pushing $40,000 through one return.
Before converting, project the taxable portion of the conversion, the additional Social Security entering taxable income, the federal and state tax brackets, and any later Medicare surcharge. Then size the conversion to a tax line the household is willing to cross.
That modeling matters because a completed Roth conversion generally cannot be reversed. The mistake hardest to undo is not considering a conversion. It is converting too much after looking at only the IRA and forgetting the Social Security check sitting beside it.
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