Working in retirement can be a smart bridge strategy: wages reduce portfolio withdrawals, delay Social Security, and give your investments more time to compound. But work also creates traps. Earnings can temporarily reduce Social Security benefits before full retirement age, employer health coverage can complicate Medicare enrollment, and one extra consulting contract can push income over a Medicare IRMAA cliff two years later.
The mistake is treating “retirement” as a single date. Many households now pass through a gray zone: age 62, part-time work, one spouse retired, one spouse still covered by an employer plan, Social Security not yet claimed, Medicare approaching, and Roth conversions under consideration. That gray zone can be powerful if planned deliberately. It can also create expensive surprises if each decision is made in isolation.
Key Takeaway
If you keep working after 62, coordinate five items before year-end: Social Security claiming, the earnings test, Medicare enrollment, HSA eligibility, and taxable income. The right answer depends on age, employer size, spouse coverage, and total income.
Trap 1: Claiming Social Security While Still Earning Too Much
Before full retirement age
If you claim Social Security before full retirement age and continue working, the retirement earnings test can temporarily withhold benefits when earnings exceed the annual limit. This does not mean work is always bad or that the withheld benefit is gone forever; Social Security recalculates benefits later. But it can create a cash-flow shock if you expected every monthly check to arrive.
For example, suppose Ellen claims at 63 because she wants predictable income, then earns $48,000 from consulting. If the earnings test withholds several months of benefits, her plan may suddenly depend more heavily on IRA withdrawals. Those withdrawals can increase taxable income, which can affect the taxation of Social Security itself and potentially future Medicare premiums.
Once you reach full retirement age, the earnings test no longer applies. That is why many still-working retirees either delay claiming until full retirement age or delay all the way to 70 if they can cover expenses from wages and savings. For broader claiming math, see when to claim Social Security and the comparison of Social Security at 67 vs. 70.
Trap 2: Missing the Medicare Enrollment Rules
Working past 65 with employer coverage
Working past 65 does not automatically mean you can ignore Medicare. The key question is whether you have active employer group health coverage and how many employees the employer has. Coverage from a current employer is different from retiree coverage, COBRA, marketplace coverage, or a spouse's non-active-employment coverage. The details affect whether you can delay Part B without penalty.
Medicare.gov and CMS guidance generally make the employer-coverage question central: active group coverage, employer size, and whether coverage is current-employment coverage can change the enrollment deadline. People at employers with 20 or more employees often have more flexibility to delay Medicare Part B while covered by active group coverage. People at employers with fewer than 20 employees may need Medicare to be primary at 65. The wrong assumption can create late enrollment penalties, denied claims, or coverage gaps. Before turning 65, ask HR for written confirmation of whether your prescription drug coverage is creditable for Part D and whether the employer plan is primary or secondary to Medicare.
Warning
Do not rely on a casual “you are covered” answer. Ask whether your prescription coverage is creditable, whether the employer plan is primary or secondary after 65, and what happens to a spouse if you enroll in Medicare or leave work mid-year.
Trap 3: Accidentally Breaking HSA Eligibility
Health Savings Accounts are valuable because contributions can be deductible, growth can be tax-deferred, and qualified medical withdrawals can be tax-free. But you generally cannot contribute to an HSA once enrolled in Medicare. This includes situations where Part A enrollment is retroactive, which can happen when someone enrolls after age 65.
If you are working past 65 and still contributing to an HSA, coordinate the stop date carefully before Medicare begins. A conservative approach is to stop HSA contributions before any retroactive Medicare Part A period can apply, then confirm the exact date with your tax preparer or benefits administrator. Excess HSA contributions can create tax cleanup work. For high earners using an HSA as a healthcare reserve, the final contribution year should be planned, not discovered after filing taxes.
Trap 4: Turning Part-Time Income Into an IRMAA Surcharge
How work income affects Roth conversions and IRMAA
IRMAA is based on modified adjusted gross income from two years earlier. That means income from work in 2026 can affect Medicare premiums in 2028. Wages, consulting income, traditional IRA withdrawals, taxable Social Security, capital gains, and rental income can all contribute to the calculation.
Consider a couple age 64 with $170,000 of wages, $20,000 of taxable investment income, and a planned $40,000 Roth conversion. Depending on deductions, adjustments, and any tax-exempt interest, that income stack could push AGI/MAGI over an IRMAA threshold. If that happens, the premium increase arrives later, when they may no longer remember the income event that caused it. Review what income counts for IRMAA before stacking wages, conversions, and capital gains in the same year.
Important Consideration
Working longer can reduce withdrawals, but it can also shrink the low-income window for Roth conversions. If wages remain high through age 65 or 67, aggressive conversions may be better delayed, reduced, or spread across multiple years.
Trap 5: Forgetting State Taxes and Local Benefits
Federal taxes get most of the attention, but state rules can change the answer. Some states tax wages heavily but exempt part of retirement income. Others tax Social Security differently or offer property-tax relief tied to income limits. A few thousand dollars of part-time work can affect more than your federal bracket.
If you are planning a move, semi-retirement makes the tax comparison more complicated. A state that looks attractive for a fully retired household may be less attractive while one spouse still earns wages. Pair any work decision with your broader relocation and housing-cost plan, especially if you are trying to qualify for senior property tax relief or manage taxable retirement withdrawals.
A Practical Working-in-Retirement Decision Framework
- List expected earned income by year. Separate W-2 wages, self-employment income, bonuses, and consulting revenue.
- Choose Social Security claiming ages deliberately. Test 62, full retirement age, and 70 rather than claiming just because work slowed down.
- Confirm Medicare coordination before 65. Get written answers from HR or the plan administrator.
- Set an HSA stop date. If you will enroll in Medicare, avoid excess contributions in the retroactive coverage window.
- Check IRMAA two years ahead. Look at wages, conversions, capital gains, and taxable withdrawals together.
- Revisit withdrawal order. Wages may let you preserve portfolio assets, but taxable withdrawals may still be useful in low-bracket years.
Using Bullseye to Model Semi-Retirement
Bullseye can help you compare work and retirement timing because it projects income, expenses, taxes, Social Security, Medicare costs, RMDs, and withdrawals year by year. It does not automatically know your employer's Medicare coordination rules, and it does not provide legal or tax advice, but it can show the financial consequences once you enter your assumptions.
Use Scenarios to manually enter different work-income assumptions, such as “stop work at 62,” “consult until 65,” and “work part time until 67.” Bullseye does not automatically model part-time work rules or employer Medicare coordination, so those assumptions must come from you, HR, Medicare guidance, or a qualified advisor. Then review how each path affects withdrawals, federal and state taxes, Social Security claiming, IRMAA exposure, and asset balances through age 95. Bullseye's AI retirement planner and retirement withdrawal planner are especially useful when work income overlaps with IRA withdrawals and Social Security timing.
Bottom Line
Working in retirement is often financially positive, but it is not automatically simple. The same wages that protect your portfolio can reduce early Social Security payments, complicate Medicare timing, end HSA eligibility, and raise future Medicare premiums. Before accepting another year of work or a consulting contract, run the decision through Social Security, Medicare, tax, and withdrawal planning together.
