Joe F. Schmitz Jr. Flags 13 Pension Tax Traps for Retirees

Q: Why might earning just one extra dollar in retirement suddenly cause your Medicare premiums and Social Security taxes to skyrocket?

Because parts of the retirement tax system work as hard thresholds, not smooth phase-ins. A retiree can cross an income line by just $1 and trigger a full new Medicare surcharge bracket, while that same extra income can also make more of Social Security taxable. The biggest example is Medicare’s IRMAA surcharge. For 2026, Medicare looks at 2024 modified adjusted gross income, using a two-year lag. If MAGI goes above $109,000 for a single filer or $218,000 for a married couple filing jointly, premiums jump to the next tier. It is a cliff: even $1 over the threshold can raise Part B and Part D premiums for the whole year. Social Security taxation also has threshold effects. Federal rules tax benefits based on “combined income,” which includes adjusted gross income, tax-exempt interest and half of Social Security benefits. Above $25,000 and $34,000 for single filers, or $32,000 and $44,000 for joint filers, up to 50% and then up to 85% of benefits can become taxable. Pension income, IRA withdrawals, capital gains or a Roth conversion can push retirees over those lines. That is why one extra dollar can have an outsized impact: it is not usually the dollar itself, but the threshold it crosses. A pension makes this risk more common because it creates steady taxable income that leaves less room before Social Security tax rules, Medicare IRMAA, and even higher capital gains rates begin to bite.

1 articles · Updated · Kiplinger's Personal Finance · Aug 12

13 pension-related tax effects can leave retirees owing more than expected because pension income stacks with Social Security and withdrawals from 401(k)s and IRAs.
Age 73 or 75 required minimum distributions can intensify that burden over time, pushing some retirees into higher tax brackets, making up to 85% of Social Security taxable and lifting Medicare IRMAA premiums.
Schmitz says the tax hit is interconnected: higher income can also raise capital-gains rates, complicate survivor planning through the widow's penalty and affect whether monthly pension or lump-sum options make more sense.
Key tools he highlights include Roth conversions, tax diversification across traditional, Roth and taxable accounts, asset location planning and charitable giving through qualified charitable distributions or donor-advised funds.
The broader message is that pension holders should treat taxes as a core retirement-planning issue rather than an annual filing exercise, using long-term projections to manage lifetime tax costs.