If you're 60 and earning $300K, you might think Medicare is years away — irrelevant to current planning. You'd be wrong. Medicare premiums are based on your income from 2 years prior, with sharp 'cliff' brackets that can add $876+ per person per year of premium for tiny income changes. Your decisions at 60-63 directly determine your Medicare costs at 62-65. This 2-year lookback creates planning opportunities and pitfalls that most financial advisors never mention to pre-Medicare clients.
How IRMAA works mechanically. Medicare Part B and Part D premiums have 'standard' rates that everyone pays. Above certain income thresholds, additional 'Income-Related Monthly Adjustment Amounts' (IRMAA) increase your premiums. The 2026 standard Part B premium is $185/month. The highest tier (single AGI over $500K, MFJ over $750K) pays $629/month — a $444 increase per person, or $5,328 per year per person.
The 2026 IRMAA brackets for Part B (single/MFJ):
Tier 0 (standard $185): AGI ≤ $103K / ≤ $206K MFJ
Tier 1 ($258): $103-129K / $206-258K
Tier 2 ($369): $129-161K / $258-322K
Tier 3 ($480): $161-193K / $322-386K
Tier 4 ($592): $193-500K / $386-750K
Tier 5 ($629): >$500K / >$750K
The brackets are CLIFFS, not gradual phase-ins. Earning $1 over a tier threshold means $876+ per person of additional premiums for the entire next year. A married couple crossing into Tier 2 at $258,001 vs $258,000 of AGI pays $4,416 more per couple ($2,208 each × 2). For $1 of income difference.
The 2-year lookback rule: IRMAA for 2026 is based on your AGI from 2024. IRMAA for 2028 is based on 2026 income. So decisions you make now (capital gains, Roth conversions, RSU vesting) directly determine your Medicare costs in 2 years.
Planning implications for high earners approaching Medicare. If you'll turn 65 in 2028, your 2026 income matters intensely. Common moves that push you across IRMAA brackets:
Roth conversions. Converting $80K from Traditional to Roth IRA adds $80K to AGI. If your base AGI is $200K, the conversion pushes you to $280K — crossing two IRMAA brackets. Additional Medicare cost: $4K-$5K per couple. Plus the ordinary income tax on the conversion (typically $20K-$28K). Total cost of the $80K conversion: $24K-$33K. The conversion may still make sense long-term, but the IRMAA impact must be modeled.
Real estate or stock sale. A one-time large capital gain pushes AGI substantially. A $500K capital gain on top of $250K base AGI crosses through Tier 4 and into Tier 5 of IRMAA. Cost: $4,800+ per couple in additional Medicare. Strategic timing: spread the gain across years (where possible) or accept the IRMAA hit if the underlying transaction makes sense.
RSU vesting. For tech executives near retirement, RSU vesting in pre-retirement years stacks with base salary to push AGI very high. Combined with IRMAA implications, retirement timing decisions get more complex. Some executives delay retirement specifically to get past large vesting events without contributing to retirement IRMAA.
Inheritance. Receiving an inherited IRA forces RMDs (10-year rule for non-spouse beneficiaries). The forced taxable income hits AGI and IRMAA. A 60-year-old inheriting $500K of Traditional IRA from a parent will face $50K-$100K of forced annual distributions over 10 years, meaningful IRMAA implications.
Strategy 1: bracket-aware Roth conversions. Don't convert across IRMAA brackets unintentionally. Model the next 5 years of AGI projection. If your conversion will cross a bracket, evaluate whether the long-term tax savings exceed the IRMAA cost. Sometimes the answer is yes (you'd cross the bracket eventually anyway during RMD years), sometimes no.
Strategy 2: timing one-time events. If you're planning a large gain event (real estate sale, business sale, large RSU vest), evaluate the IRMAA impact 2 years out. If possible, time the event to fall in a year you would have crossed the bracket anyway, or in a year before Medicare starts (no IRMAA at age 64 for events that will be 'old' by 65).
Strategy 3: charitable giving. Charitable contributions reduce AGI (above-the-line for QCD post-70½, itemized for direct gifts). Large charitable giving in high-income years reduces both income tax AND future Medicare premiums via IRMAA reduction.
Strategy 4: tax-loss harvesting. Reducing realized gains via tax-loss harvesting reduces AGI. Especially valuable in years approaching IRMAA brackets — the harvested losses might keep you below a threshold.
Strategy 5: HSA contributions. HSA contributions reduce AGI. For high earners eligible for HSAs, this is one of few above-the-line deductions still available. Reducing AGI by $8,750 (family limit) might keep you below an IRMAA bracket worth $876-$1,752 per couple in Medicare savings.
IRMAA appeal options: 'life-changing events' (LCE) qualify you for IRMAA reconsideration. These include: marriage, divorce, death of spouse, work stoppage, work reduction, loss of income-producing property, loss of pension income, employer settlement payment. If your 2 years prior income was unusually high due to a one-time event that no longer reflects your situation, file Form SSA-44 to request reconsideration.
The big-picture lesson: IRMAA is one of the most overlooked components of high-earner tax planning. The 2-year lookback means your decisions at 60 directly affect your Medicare costs at 62. The cliff structure means small income changes can produce $1K-$5K per year of additional cost. Combined with the income tax on the underlying decisions, IRMAA effectively raises your marginal tax rate by 2-5 percentage points in pre-Medicare years.
If you're 55+, model IRMAA as part of every income-recognizing decision. Your CPA may not raise it; you should. The lifetime cost of getting it wrong can exceed $50K-$100K. The cost of getting it right is mostly attention.