Capital Gains Impact on Medicare Costs & How to Reduce

If you’re planning to sell stocks, real estate, or other assets in retirement, you need to understand how capital gains can dramatically increase your Medicare costs. Many retirees are blindsided when their Medicare premiums spike by hundreds of dollars per month after a profitable asset sale. The culprit? IRMAA surcharges that kick in based on your modified adjusted gross income from two years prior.

What Are Capital Gains and How Do They Work?

Capital gains are the profits you make when selling assets like stocks, bonds, real estate, or businesses for more than you originally paid. The IRS treats these gains as taxable income, which means they count toward your modified adjusted gross income (MAGI) — the same income Medicare uses to determine IRMAA eligibility.

There are two types of capital gains:

• Short-term capital gains: From assets held less than one year, taxed at ordinary income tax rates
• Long-term capital gains: From assets held more than one year, taxed at preferential rates (0%, 15%, or 20% depending on income)

While long-term gains receive better tax treatment, both types count equally toward your MAGI for Medicare IRMAA purposes.

How IRMAA Works with Capital Gains

IRMAA (Income-Related Monthly Adjustment Amount) is Medicare’s way of charging higher-income beneficiaries more for their coverage. Here’s the key detail most people miss: Medicare looks back two years to determine your IRMAA bracket. So if you have a large capital gain in 2026, it will affect your Medicare premiums in 2027.

For 2025, the IRMAA brackets are:

Income Level (Single/Joint)	Part B Monthly Surcharge	Part D Monthly Surcharge
Under $106,000/$212,000	$0	$0
$106,000-$133,000/$212,000-$266,000	$259.00	$13.70
$133,000-$167,000/$266,000-$334,000	$518.10	$35.10
$167,000-$200,000/$334,000-$400,000	$777.20	$56.60
$200,000-$500,000/$400,000-$750,000	$1,036.20	$78.00
Over $500,000/$750,000	$1,295.30	$85.80

Agent Tip

I’ve seen clients get hit with over $1,600 per month in additional Medicare costs after a single large asset sale. The Part D IRMAA applies whether you have a standalone Part D plan or get prescription coverage through a Medicare Advantage plan — there’s no escaping it.

Real-World Example: The Hidden Cost of Asset Sales

Let’s say you’re a married couple with typical retirement income of $80,000 annually. You decide to sell a rental property and realize a $150,000 capital gain. Your total income jumps to $230,000 for that year, pushing you into the second IRMAA bracket.

Two years later, your Medicare premiums increase by:

• Part B: $259 per month each spouse = $518 monthly
• Part D: $13.70 per month each spouse = $27.40 monthly
• Total additional cost: $545.40 per month or $6,544.80 annually

This continues for the entire year, regardless of whether your income returns to normal levels. If you’re considering Medicare Supplement vs Medicare Advantage options, remember that IRMAA affects both paths equally for Part B and prescription drug coverage.

Proven Strategies to Minimize IRMAA Impact

1. Work with a Qualified Tax Professional

The most important step is partnering with a CPA or tax planner who understands Medicare implications. They can help you model different scenarios and timing strategies before you sell assets. This planning becomes especially crucial when you’re approaching Medicare eligibility or already enrolled.

2. Use Tax-Loss Harvesting

Tax-loss harvesting involves selling investments with losses in the same tax year you realize gains. The losses offset the gains, potentially keeping you below IRMAA thresholds. This strategy works best with diversified investment portfolios where you have both winners and losers.

3. Consider Delaying Social Security

Since Social Security benefits count toward your MAGI, delaying benefits can provide additional room for capital gains before triggering IRMAA. If you’re planning major asset sales, waiting to start Social Security until after those transactions complete might make financial sense.

4. Spread Sales Over Multiple Years

Instead of selling everything at once, consider spreading large asset sales across multiple tax years. This strategy keeps your income more level and may prevent you from jumping into higher IRMAA brackets. However, you need to balance this against market conditions and your overall financial goals.

Agent Tip

Many of my clients don’t realize they can appeal IRMAA decisions if their income has significantly decreased due to life-changing events like retirement, divorce, or loss of income. The appeal process can provide relief if your current income is much lower than what Medicare is using for calculation.

Special Considerations for Different Medicare Plans

IRMAA affects all Medicare beneficiaries, but the impact varies by plan type:

Original Medicare with Supplement Plans

If you have Medicare Plan G or another supplement plan, IRMAA only affects your Part B and Part D premiums. Your supplement premium remains unchanged. This is one advantage of the predictable cost structure that comes with Medicare supplements.

Medicare Advantage Plans

Medicare Advantage members still pay IRMAA surcharges on top of their plan premiums. If your Medicare Advantage plan includes prescription drug coverage, you’ll pay both the Part B and Part D IRMAA amounts, even though your drug coverage is built into your Advantage plan.

Planning Around Medicare’s Two-Year Lookback

Understanding Medicare’s two-year lookback period is crucial for timing major financial decisions. If you know you’ll have significant capital gains, consider these timing strategies:

• Pre-Medicare planning: If you’re 63 and planning to sell assets, those gains will affect your Medicare costs starting at age 67
• Post-65 planning: Large gains at age 66 will impact your Medicare costs from age 68-69
• End-of-life planning: Consider the Medicare impact when planning estate distributions or trust transactions

This lookback period also means that if your income drops significantly after a one-time capital gain, you’ll need to wait two full years before seeing relief from IRMAA surcharges.

Other Income Sources That Trigger IRMAA

Capital gains aren’t the only income source that can push you into IRMAA brackets. Other common triggers include:

• Large 401k withdrawals or Roth conversions
• Pension distributions
• Rental income
• Business income
• Interest and dividend income

The key is looking at your total modified adjusted gross income, not just individual components. Sometimes multiple smaller income sources combine to trigger IRMAA when none would individually.

Frequently Asked Questions

Can I avoid IRMAA if I donate my capital gains to charity?

Charitable donations can help reduce your taxable income, but they don’t directly offset capital gains for IRMAA purposes. The gain still counts toward your MAGI even if you donate the proceeds. However, large charitable deductions might reduce other income sources enough to keep you below IRMAA thresholds.

What happens if my income varies significantly from year to year?

Medicare recalculates your IRMAA annually based on the most recent tax information available. If you have a one-time capital gain followed by normal retirement income, you’ll pay IRMAA for just one year. However, you can appeal if you’ve experienced a significant decrease in income due to life-changing events.

Do capital losses offset capital gains for Medicare purposes?

Yes, net capital losses can offset capital gains when calculating your MAGI for IRMAA. However, you can only deduct up to $3,000 in net capital losses against ordinary income per year, with additional losses carried forward to future years.

How do I know which IRMAA bracket I’ll be in?

Your tax return shows your modified adjusted gross income. Compare this to the current year’s IRMAA brackets, but remember Medicare uses income from two years prior. Work with a tax professional to project your IRMAA exposure before making major asset sales.

Can I change my Medicare plan to avoid IRMAA?

No, IRMAA applies regardless of which Medicare plan you choose. Whether you have Original Medicare, a Medicare supplement plan, or Medicare Advantage, you’ll pay the same IRMAA surcharges if your income exceeds the thresholds.