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How 'Phantom Income' Is Quietly Raising Retirees' Taxes - And 5 Triggers To Watch

A hidden factor could be reshaping your tax picture.

By Adam Palasciano , Edited by Laura Hohenstein

Updated May 7, 2026

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Many retirees may assume their taxes will drop once they stop working. But in reality, certain types of income can quietly increase how much you owe — even if your lifestyle hasn't changed or your Social Security benefits remain the same. However, the difference may not be that obvious at first.

Income in retirement doesn't always work the way people expect, especially when withdrawals, benefits, and tax rules start to interact. These hidden triggers can quietly push you into higher tax brackets or increase health care costs without a clear warning. That's why understanding how these pieces fit together can make a meaningful difference over time.

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Social Security can become taxable sooner than expected

Many retirees may be surprised to learn that Social Security income can be taxed. Depending on your combined income — which includes wages, withdrawals, one-half of your annual Social Security benefit, and even tax-free interest — up to 85% of your benefits may be subject to federal taxes, according to the Social Security Administration. For an individual, this rule applies if your federal tax return exceeds $25,000, or $32,000 if you're a married couple filing jointly.

This means that adding even a small amount of additional income can trigger taxes on benefits that were previously untaxed. The result may be a higher overall tax bill, even if your total spending hasn't changed. This is one of the most common ways "phantom income" shows up in retirement.

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Required minimum distributions can increase your tax burden

Once you reach age 73, you are generally required to take minimum withdrawals from retirement accounts, including traditional IRAs, SEP IRAs, and SIMPLE IRAs. These required minimum distributions, or RMDs, are taxed as ordinary income, according to the IRS.

Even if you don't need the money, the withdrawal still counts toward your taxable income. That can push you into a higher tax bracket or increase the portion of your Social Security benefits that are taxed. For retirees with large account balances, this effect can grow significantly over time.

Roth conversions can create short-term tax spikes

Roth conversions are often used as a strategy to reduce future taxes, but they can increase taxable income in the year they are completed. Converting funds from a traditional IRA to a Roth IRA requires paying taxes upfront, according to the IRS.

While this can be beneficial long term and guarantee tax-free withdrawals in retirement, it may temporarily raise your tax bill or affect other parts of your financial picture. For example, a large conversion could push more of your Social Security benefits into the taxable range. Planning the timing and size of conversions is key to avoiding unintended financial consequences.

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Medicare premiums can rise based on prior income

Another hidden cost comes from Medicare surcharges, known as IRMAA (Income-Related Monthly Adjustment Amount). These surcharges are based on your income from two years prior. For example, for your 2026 Medicare premiums, your 2024 tax return is used to determine whether you're subject to IRMMA for the year.

This means a spike in income — from an RMD or Roth conversion — can increase your Medicare premiums later. Many retirees don't anticipate this delayed effect, which can feel like an unexpected expense. Even a one-time income increase can lead to higher costs for a full year.

Investment income can quietly add to the total

Income from investments, such as dividends, capital gains, and interest, also contributes to your overall taxable income. While these sources may seem separate, they are included in the calculations that determine taxes and Medicare costs.

This can create a compounding effect, where multiple income streams push you into higher thresholds. Over time, even modest gains can have a noticeable impact. Keeping track of all income sources is essential for understanding your full tax picture.

Small changes can trigger larger tax consequences

One of the most challenging aspects of "phantom income" is how small changes can lead to larger effects. A slightly higher withdrawal, an extra investment gain, or a one-time financial move can push you over key thresholds.

These thresholds often determine how much of your Social Security is taxed or whether you pay higher Medicare premiums. The result is a ripple effect that increases costs beyond the initial change. Being aware of these tipping points can help you avoid surprises.

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Bottom line

"Phantom income" isn't always obvious, but it can have a real impact on your retirement finances. From taxable Social Security benefits to RMDs and Medicare surcharges, multiple factors can combine to raise your costs even when your spending stays the same.

Taking a closer look at how your income is structured — and planning withdrawals, conversions, and investments carefully — can help you build a more effective retirement plan. Even small adjustments can make a meaningful difference in how much you keep over time.

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