Retirement Tax Traps and Penalties: 5 Gotchas That Catch People Off Guard

Even the most disciplined savers can be blindsided in retirement by unexpected taxes, penalties, and benefit reductions that derail a carefully built plan. These “retirement gotchas” often appear subtle during your working years but can cost tens of thousands once you stop earning a paycheck.

Here are five of the biggest surprises retirees face—and how to avoid them before it’s too late.

1. The Tax Torpedo from Social Security

Many retirees are surprised to learn that Social Security isn’t always tax-free. Depending on your income, up to 85% of your benefit can be taxed.

The IRS uses something called “provisional income,” which includes half your Social Security benefit plus all other taxable income and tax-free municipal bond interest.

• For individuals, taxes begin when provisional income exceeds $25,000.

• For married couples, it starts at $32,000.

A well-intentioned IRA withdrawal or capital gain can push you over these thresholds—causing a sudden jump in taxes. Strategic Roth conversions and careful withdrawal sequencing can help smooth this out over time.

2. Higher Medicare Premiums (IRMAA)

The Income-Related Monthly Adjustment Amount (IRMAA) is one of the most overlooked retirement costs. Once your modified adjusted gross income (MAGI) exceeds certain limits, your Medicare Part B and D premiums increase—often by thousands of dollars per year.

For 2025, IRMAA surcharges begin when MAGI exceeds roughly $103,000 for single filers or $206,000 for married couples. The catch? Medicare looks back two years at your income. A Roth conversion, property sale, or large one-time distribution can unexpectedly trigger higher premiums two years later.

Proactive tax planning can prevent crossing these thresholds unintentionally.

3. Required Minimum Distributions (RMDs)

Once you reach age 73, the IRS requires you to start withdrawing from pre-tax retirement accounts each year—whether you need the money or not. These RMDs are taxed as ordinary income and can increase your tax bracket, raise Medicare premiums, and reduce your eligibility for certain deductions.

The biggest mistake is waiting until your 70s to plan for them. Roth conversions in your 60s can reduce future RMDs, and charitable giving through Qualified Charitable Distributions (QCDs) can offset the tax impact once they begin.

4. The Widow’s Penalty

When one spouse passes away, the surviving spouse’s tax brackets and standard deduction are cut in half—but income sources often don’t decrease proportionally. Social Security may drop by one benefit, but RMDs, pensions, and investment income remain largely the same.

The result is a higher effective tax rate for the survivor. This “widow’s penalty” can last for years, especially when combined with RMDs and Medicare surcharges. Couples can reduce the long-term impact through lifetime Roth conversions, strategic asset titling, and beneficiary planning.

5. State Taxes and Hidden Relocation Costs

Many retirees move to lower-tax states hoping to stretch their income, but state-level taxes can be tricky. Some states tax pension and IRA withdrawals, others tax Social Security, and a few impose taxes on out-of-state income or estates.

Additionally, higher property taxes, insurance premiums, and healthcare costs can offset income tax savings. A comprehensive cost-of-living comparison is essential before relocating.

Our analysis at Greenbush Financial Group often reveals that the “best” retirement state depends more on quality of life, healthcare access and total cost of living than on income tax rates alone.

How to Avoid These Retirement Surprises

Most retirement gotchas come down to timing and coordination—especially between taxes, Social Security, and healthcare. A few key steps can make a major difference:

• Run retirement income projections that include taxes and IRMAA thresholds.

• Consider partial Roth conversions before RMD age.

• Sequence withdrawals intentionally between taxable, tax-deferred, and Roth accounts.

• Evaluate the long-term impact of home state taxes before moving.

• Review beneficiary and trust structures regularly.

The earlier you identify potential traps, the easier they are to fix while you still control your income and withdrawals.

The Bottom Line

Retirement is more complex than simply replacing a paycheck. The interplay between taxes, healthcare, and income sources can turn small decisions into costly mistakes. By spotting these gotchas early, you can preserve more of your wealth and enjoy a smoother, more predictable retirement.

Our advisors at Greenbush Financial Group can help you identify your biggest risk areas and design a plan to minimize the tax and income surprises most retirees never see coming.

FAQs: Retirement Planning Surprises

Q: Are Social Security benefits always taxed?
A: No. But depending on your income, up to 85% of your benefits may be taxable.

Q: How can I avoid higher Medicare premiums?
A: Manage your income below IRMAA thresholds through strategic Roth conversions and tax-efficient withdrawals.

Q: What happens if I miss an RMD?
A: You could face a 25% penalty on the amount not withdrawn, reduced to 10% if corrected quickly.

Q: Why do widows and widowers pay more in taxes?
A: Filing status changes from joint to single, cutting brackets and deductions in half while much of the income remains.

Q: Are all retirement states tax-friendly?
A: No. Some states tax retirement income or have higher overall costs despite no income tax.

Rob Mangold

About Rob……...

Hi, I’m Rob Mangold. I’m the Chief Operating Officer at Greenbush Financial Group and a contributor to the Money Smart Board blog. We created the blog to provide strategies that will help our readers personally, professionally, and financially. Our blog is meant to be a resource. If there are questions that you need answered, please feel free to join in on the discussion or contact me directly.