Why Did My Medicare Premium Go Up? Understanding IRMAA, Retirement Taxes, and Income Planning
Written By Bret Mooney
At VestGen Wealth Partners, one question we often hear from retirees is:
"Why did my Medicare premium go up when nothing changed in my spending?"
In many cases, the answer is not a Medicare error or a change in coverage. It often comes down to how Medicare calculates income based premiums through the Income Related Monthly Adjustment Amount (IRMAA).
What surprises many retirees is that IRMAA is not limited to wages or Social Security income. Taxable events such as IRA withdrawals, capital gains, and Roth conversions can all affect future Medicare costs.
What IRMAA Actually Is
IRMAA is an additional surcharge applied to Medicare Part B and Part D premiums when income exceeds certain thresholds.
Rather than reflecting current year cash flow, IRMAA is based on Modified Adjusted Gross Income (MAGI) reported on a tax return from two years prior.
That timing difference means today's Medicare premium is often tied to financial decisions made years earlier, which can make premium changes feel unexpected.
Why Retirement Taxes Are Connected
A common misconception is that Medicare premiums are fixed. In reality, IRMAA can be influenced by several sources of taxable income, including:
Required Minimum Distributions (RMDs)
Traditional Individual Retirement Account (IRA) withdrawals
Roth conversions
Capital gains from investments
Interest and dividend income
Because these items flow through a tax return, they can affect Medicare premiums even when the income was not needed for everyday spending.
One financial decision can often influence several areas at once. A Roth conversion, for example, may increase taxable income in the current year and affect IRMAA calculations in a future year.
How Roth Conversions and Capital Gains Can Affect Medicare Premiums
Roth conversions involve moving assets from a traditional IRA into a Roth IRA and paying taxes on the converted amount.
As discussed in VestGen Wealth Partners' article, Steps to Reduce Medicare Premiums, Roth conversions are often evaluated alongside Medicare premium thresholds because the additional taxable income created by a conversion may affect future IRMAA calculations.
Capital gains can work similarly. Selling investments, rebalancing a portfolio, or realizing gains from appreciated assets can increase MAGI and potentially affect Medicare premiums in future years.
The goal is not necessarily to avoid these strategies, but to understand how they fit within a broader retirement income plan.
Planning Around IRMAA
Because IRMAA is tied to specific tax years, planning ahead may help retirees better coordinate income sources.
Common planning considerations may include:
Coordinating Roth conversions during lower income years
Spreading capital gains across multiple tax years
Balancing withdrawals among taxable, tax deferred, and Roth accounts
Coordinating RMDs with other income sources
The focus is often on timing and coordination.
When IRMAA Reconsideration May Apply
In some situations, retirees may request an IRMAA reconsideration if income has changed because of a qualifying life event.
These situations may include:
Retirement or a reduction in work income
Marriage, divorce, or death of a spouse
Loss of income producing property
Certain one time income events
As outlined in VestGen Wealth Partners' article, IRMAA Reconsideration: How Retirees May Reduce Medicare Premiums After a Life Change, Social Security may review whether Medicare premiums should be adjusted using more current financial information.
Final Thoughts
An increase in Medicare premiums is often tied to prior taxable income rather than current spending or coverage changes.
Understanding how IRMAA works can help connect retirement income decisions, tax planning, and future Medicare costs. Reviewing these areas together may provide greater clarity around how financial decisions made today can affect retirement costs in the years ahead.
Sources:
VestGen Wealth Partners, Steps to Reduce Medicare Premiums
Social Security Administration, Medicare Premiums
IRS Retirement Topics: Required Minimum Distributions (RMDs)