Most people look forward to retirement with a sense of relief: fewer deadlines, more time for travel and family, and the freedom to enjoy the life you’ve worked so hard to build. But one part of retirement often catches people off guard: taxes.
Not because retirees are doing anything wrong. Far from it. The reality is simply that retirement tax rules are layered, interconnected, and sometimes downright confusing. Small decisions can have surprisingly big consequences.
Our goal at Petra Financial Advisors is not to alarm you, but to empower you. When you understand how the system works, you can avoid costly surprises and keep more of your money working for you.
Here are some of the most common “tax traps” that catch retirees off guard, and how thoughtful, proactive planning can help you sidestep them.
When Social Security Becomes Taxable
Many retirees are surprised to learn that their Social Security benefits can be taxable. If your income is very low, typically under $32,000 Married Filing Jointly (MFJ) or $25,000 Single of provisional income, your Social Security will not be taxable. However, anything above this amount of income pushes more of your Social Security income into taxable income. This means that up to 85% of your Social Security income becomes taxable at your regular marginal tax rate.
How It Works
The key concept is provisional income, which combines:
- Your adjusted gross income (AGI) (not including Social Security)
- Plus Tax-exempt interest
- Plus half of your Social Security benefits
If this provisional income exceeds certain thresholds, a portion of your Social Security benefits becomes taxable. Additionally, these thresholds do not increase with inflation. This means that over time, more and more of your social security income will fall into the taxable range.
What Pushes You Into Higher Taxability
- Required Minimum Distributions (RMDs) or withdrawals from traditional IRAs
- Capital gains or bond interest (even municipal bond interest counts) from either fund distributions or from the sale of investments
- Retirement account conversions (Roth Conversions)
What You Can Do
- Consider strategic Roth conversions in early retirement, when your income is lower, and before you start taking Social Security
- Withdraw from taxable accounts (like brokerage accounts) first when feasible
- Coordinate Social Security claiming strategy timing with your overall withdrawal plan
- Monitor tax-brackets, provisional income, and the interaction with Social Security
IRMAA: The Hidden Medicare Surcharge
What IRMAA Is
For those enrolled in Medicare Part B and/or Part D, the income-related monthly adjustment amount (IRMAA) is a surcharge on top of the standard premiums for higher-income beneficiaries.
How It Works
- IRMAA is based on your modified adjusted gross income (MAGI) from two years prior
- If your MAGI is above certain thresholds, you pay the surcharge each month. For example, if your 2024 MAGI was above $109k Single/$218k MFJ, you will pay an additional $81.20 per month for Medicare in 2026 than if your income was below this amount.
- This surcharge is reassessed each year. If you had a high-income year (due to the sale of a second home, for example) in 2024, your Medicare premiums would be higher in 2026. However, if your income went back down in 2025, you would have lower premiums in 2027.
What Triggers the Surcharge
- Large (non-Roth) retirement account withdrawals
- A work bonus or investment gain that spikes your income
- One-time events like a Roth conversion or selling a home or other asset
What You Can Do
- Spread “big income events” over years to avoid spikes
- Plan Roth conversions early when your MAGI is lower
- Monitor the two-year lag to prevent surprise Medicare surcharge costs
- Work with someone who understands the linkage between taxes, MAGI, and Medicare
The Widow(er)’s Tax Penalty
One of the most impactful and least understood tax traps occurs when a spouse passes away. After that event, the surviving spouse often moves from married filing jointly (MFJ) to single filing status—which has narrower tax brackets and lower income thresholds. This shift can mean significantly higher taxes and potentially higher Medicare surcharges.
Why It Matters
- The surviving spouse may have similar total income, but a change in filing status increases marginal tax rates.
- IRMAA thresholds are lower for single filers than joint filers.
- Taxability of Social Security thresholds are lower for single filers.
- Inheriting an IRA from a spouse creates a higher balance (if both spouses had IRAs) from which the surviving spouse has to take RMDs, and if the surviving spouse was older, the RMD could be higher than prior to the death.
What You Can Do
- For couples, consider multi-year Roth conversion strategies while both spouses are alive. This will help reduce future RMDs as well as provide options for taking distributions from non-taxable sources later to help manage tax brackets.
- Coordinate Social Security start dates and account withdrawals strategically, keeping in mind Social Security survivor benefits.
RMDs: When “Required” Doesn’t Mean “Optimal”
Why This Becomes a Trap
Starting at age 73 (under current IRS rules), retirees must begin taking Required Minimum Distributions (RMDs) from their pre-tax retirement accounts. Even if you don’t need the money, the IRS requires you to withdraw and pay taxes.
These distributions can:
- Push you into higher federal tax brackets
- Increase your provisional income and thus taxability of Social Security
- Raise your MAGI and increase your IRMAA Medicare surcharges
- Affect capital gains and tax on investments
What You Can Do
- Start planning for RMDs decades ahead of time, if possible.
- Consider Roth conversions earlier (when income is lower) so you have less to withdraw later.
- Use Qualified Charitable Distributions (QCDs) when eligible (age 70½+) to offset RMDs and reduce taxable income.
- Coordinate investment withdrawals, RMDs, and Social Security timing for best outcomes.
Capital Gains & Investment Tax Traps
What’s the Issue
Investment income doesn’t just trigger capital gains taxes. In retirement, it can interact with other tax rules in unexpected ways:
- Realizing capital gains increases MAGI and could push you into IRMAA or increase Social Security taxation. Even if you are otherwise in the 0% capital gains bracket, the investment income could make more of your Social Security income taxable to you, causing you to pay a 10.2% tax on those capital gains.
- Mutual funds may distribute gains in December you weren’t expecting.
- Net Investment Income Tax (NIIT) of 3.8% may apply if your MAGI is above certain thresholds.
What You Can Do
- Track your taxable and even tax-exempt investments carefully.
- Realize gains strategically in low-income years to reset your tax basis in those investments.
- Monitor fund distributions at year-end. The mutual fund estimates are typically released in late November.
- Coordinate with Petra or your tax planner so that investment decisions reflect your full tax picture
Missing Out on Powerful Charitable Opportunities
Why This Often Goes Unused
- Many retirees now take the standard deduction and therefore get no itemized deduction benefit, even for large charitable gifts.
- The Qualified Charitable Distribution (QCD) from an IRA for those age 70½+ provides an “above the line” tax deduction for pre-tax IRA assets used to donate to qualified charities.
What You Can Do
- If you’re over 70½ and have an IRA, consider directing up to $111,000 per year (in 2026, indexed with inflation) as a QCD. Doing so reduces your taxable income and can satisfy all or part of your RMD, avoiding pushing your income into higher tax/IRMAA/SS tax brackets. (QCDs cannot be contributed to Donor Advised Funds)
- Combine the QCD strategy with your Roth conversion and investment withdrawal plans.
- Work with Petra or your tax professional to integrate charitable goals with tax-efficient retirement income planning.
Taxes in Retirement Don’t Have to Be Stressful
Retirement tax rules can feel overwhelming, but they don’t need to be. Knowing the landscape allows you to make decisions intentionally rather than reactively.
At Petra Financial Advisors, we specialize in multi-year retirement tax planning, helping clients:
- Reduce lifetime taxes
- Lower Medicare premiums
- Coordinate RMDs, Social Security, and investment withdrawals
- Protect the surviving spouse from unexpected tax bills
- Avoid surprises that can derail an otherwise well-planned retirement
We believe the best retirement is one where you feel confident, prepared, and supported, not anxious about the IRS or Medicare premiums.
If you’d like to better understand your own retirement tax picture or explore strategies tailored to your situation, we’d love to help guide you. Petra is here to be your trusted fiduciary partner, so you can enjoy your retirement without unnecessary financial surprises.