💰 IRMAA 是什麼？高所得 Medicare 加價一次說清楚（含收入門檻表）
你或家庭成員即將年滿 65 歲、準備加入 Medicare 嗎？
如果你的收入偏高，可能會遇到一項讓人非常意外的費用：IRMAA（Income-Related Monthly Adjustment Amount，高所得附加費）。
IRMAA 會讓你的 Medicare Part B 和 Part D 保費增加，而且增加的幅度最高可能多出幾百美元一個月，許多工程師、科技業員工、靠股票收入的人（RSU、capital gain）、自僱人士都會遇到。
這篇文章用最白話的方式，帶你一次看懂：
- 什麼是 IRMAA？
- 為什麼是看「兩年前」的收入？
- 多少收入會被加價？（附最新年度 IRMAA 收入表）
- 常見會踩雷的收入：RSU、房產出售、bonus…
- IRMAA 不是永久的！如何上訴、降低保費（Life-Changing Event）
- 65 歲前兩年該如何規劃，避免被罰
💡 IRMAA 是什麼？為什麼會被加收？
IRMAA 是美國聯邦政府對高所得人士的 Medicare 附加月費，用在：
- Medicare Part B（門診保險）
- Medicare Part D（藥物保險）
重點是：
它不是看你現在的收入，而是看「兩年前的報稅收入（MAGI）」。
例如：
- 你 2025 年加入 Medicare → 看你 2023 年的 MAGI
- 你 2026 年加入 Medicare → 看你 2024 年的 MAGI
所以，很多人會說：
「退休前兩年賺太多，Medicare 就會被加價。」
📊 2025 年 IRMAA 收入門檻（以「兩年前」為基準）
以下表格為示範（你的網站上我會放 2025 年最新版本，會依年度更新）
| 單身收入（MAGI） | 夫妻合報（MAGI） | Part B 月費 | Part D 附加費 |
|---|---|---|---|
| ≤ $103,000 | ≤ $206,000 | 標準保費 | 無 IRMAA |
| $103,001–$129,000 | $206,001–$258,000 | + IRMAA Level 1 | + IRMAA |
| $129,001–$161,000 | $258,001–$322,000 | + IRMAA Level 2 | + IRMAA |
| $161,001–$193,000 | $322,001–$386,000 | + 更高 IRMAA | + 更高 IRMAA |
| $193,001–$500,000 | $386,001–$750,000 | + 高所得 IRMAA | + 高所得 IRMAA |
| ＞ $500,000 | ＞ $750,000 | 最高 IRMAA | 最高 IRMAA |
收入越高 → Part B＋Part D 的月費越高。
🔍 什麼收入會算進 IRMAA 的 MAGI？
- W-2 薪水（科技業、工程師常見）
- RSU 股票 Vest 變成 taxable income
- 房產出售 capital gain
- 自僱收入（business income）
- 401(k) 取款（RMD）
- Interest / Dividend
- 債券利息、租金收入
簡單講：你報稅表上會出現的收入，都算。
🔥 華人最容易踩的 5 大 IRMAA 地雷
① 退休前最後一年 RSU 大量 vest
科技業最常見 → 直接把 Part B + Part D 拉到最高級距。
② 賣房子的 capital gain 被算進去
尤其是：
- 出租物件出售（不能用 250k / 500k 免稅額）
- 出租變自住時間不足
- 多物件一次處理
③ 大額 Bonus / Severance（資遣金）
④ 自僱收入、合夥 K-1 年份波動
⑤ 401(k) / IRA 取款造成 MAGI 激增
這些都足以讓 Part B／Part D 的保費從「一般人」變成「高所得級距」。
🏛️ IRMAA 不是永久的！可以上訴（Life-Changing Event）
如果你退休後收入下降，可以提出 SSA-44 表格，申請降低 IRMAA。以下情況屬於 Life-Changing Event：
- 退休或減少工時（工作收入下降）
- 配偶去世
- 離婚
- 損失 income-producing property
- 雇主停發補助（如退休金）
重點：只要能證明「未來收入會明顯下降」，社保局（SSA）就可能把你的 IRMAA 降到很低。
📉 如何降低 IRMAA？（65 歲前 2–3 年要開始做）
- 分散 RSU vest
- 房產出售不與退休同年發生
- 提前轉 Roth / 或避免 65 歲前做大額 Roth conversion
- 控制 taxable income（特別是退休的前兩年）
- 利用 HSA／從 tax-free income 支付醫療費
華人家庭的 IRMAA 情況，比一般美國人複雜許多。越早規劃，越能避免跳到高所得級距。
🔗 IRMAA 與其他 Medicare 專題的關聯
如果你第一次接觸 Medicare，建議先看這一篇基礎教學：
👉 《Medicare A / B / C / D 一次說清楚：美國紅藍卡懶人包》
如果你正在準備退休，也可以搭配：
讓整個退休醫療策略更清楚、更完整。
💰 What Is IRMAA? A Simple Guide to High-Income Medicare Surcharges
Are you or your spouse approaching age 65 and getting ready to enroll in Medicare?
If your income is on the higher side, you may be surprised by an extra charge on your Medicare bill called IRMAA.
IRMAA (Income-Related Monthly Adjustment Amount) is an additional amount that higher-income beneficiaries must pay on top of their normal Medicare Part B and Part D premiums.
For many professionals, engineers, business owners, and investors, IRMAA can add hundreds of dollars per month.
This article explains, in plain English:
- What IRMAA is and how it works
- Why Medicare looks at your income from two years ago
- Which income levels may trigger IRMAA (with sample brackets)
- Common “traps” for high earners: RSUs, home sales, bonuses, business income
- Why IRMAA is not permanent and how to appeal it
- What you can do in the 2–3 years before Medicare to reduce IRMAA risk
💡 What Is IRMAA and Why Does It Exist?
IRMAA is an income-based surcharge that is added to:
- Medicare Part B (medical insurance – doctor visits, outpatient care)
- Medicare Part D (prescription drug plans)
Here is the key idea:
The higher your income, the more you may pay for Part B and Part D each month.
Medicare uses your Modified Adjusted Gross Income (MAGI) from your tax return to decide if IRMAA applies.
But it does not use your current year income. Instead, it looks back two years.
For example:
- Your 2025 Medicare premium is based on your 2023 income.
- Your 2026 Medicare premium is based on your 2024 income.
This is why so many people say:
“If your income is very high in the last two years before retirement, your Medicare can become much more expensive.”
📊 Sample IRMAA Income Brackets (Concept Only)
The exact income thresholds and dollar amounts change every year, so you should always double-check the latest table on the Social Security or Medicare website.
But the structure usually looks like this:
| Single MAGI (2 years ago) | Married Filing Joint MAGI | Part B Monthly Premium | Part D IRMAA Surcharge |
|---|---|---|---|
| ≤ First threshold | ≤ First threshold × 2 | Standard Part B premium | No IRMAA |
| Above 1st threshold | Above 1st threshold | Standard premium + Level 1 IRMAA | Level 1 IRMAA |
| Higher income ranges | Higher income ranges | Higher IRMAA levels | Higher IRMAA levels |
| Very high income | Very high income | Maximum IRMAA | Maximum IRMAA |
The pattern is simple:
More income → higher brackets → higher Part B and Part D premiums.
Many people are surprised when they first see IRMAA because they thought Medicare premiums were the same for everyone.
In reality, people with higher incomes are expected to pay a larger share of the cost.
🔍 What Counts as Income for IRMAA Purposes?
IRMAA is based on your MAGI (Modified Adjusted Gross Income) from your tax return. This usually includes:
- W-2 wages and salaries
- Self-employment income
- RSU or stock compensation that became taxable
- Capital gains (for example, selling a home or investment property)
- Interest and dividends
- Rental income
- Traditional IRA or 401(k) withdrawals (including RMDs)
In simple terms: if it shows up as taxable income on your tax return, it probably counts toward IRMAA.
🔥 Five Common IRMAA “Traps” for High-Income Households
1️⃣ Large RSU or stock vesting right before retirement
This is very common in tech. A big year of stock vesting can push your MAGI into a much higher bracket and trigger IRMAA two years later.
2️⃣ Selling a rental or investment property
A big capital gain from selling property can make your income spike. If it happens close to retirement, it may cause higher Medicare premiums for one or two years.
3️⃣ Large bonus or severance package
Big one-time payments (bonuses, severance, retention pay) can unexpectedly push you into IRMAA territory.
4️⃣ Fluctuating business or self-employment income
Business owners and consultants often have uneven income. A very profitable year just before retirement may lead to IRMAA later.
5️⃣ Required minimum distributions (RMDs)
After a certain age, you must take RMDs from traditional IRAs / 401(k)s. If these withdrawals are large, they may trigger or keep you in an IRMAA bracket.
🏛️ The Good News: IRMAA Is Not Always Permanent
Many people think, “Once I’m stuck with IRMAA, I’ll pay it forever.”
That is not always true.
If your income has dropped due to a life-changing event, you can ask Social Security to re-evaluate your IRMAA.
You do this by filing the SSA-44 form and explaining your situation.
Examples of life-changing events include:
- Retirement or reduction in work hours (your earned income is now much lower)
- Marriage or divorce
- Death of a spouse
- Loss of income-producing property
- Loss of certain types of pension or employer payments
If your request is approved, your Part B and Part D premiums may be reduced to a lower IRMAA level, or even back to the standard premium.
📉 Planning Ahead: How to Reduce IRMAA Risk
The best time to manage IRMAA is usually 2–3 years before you start Medicare, because of the two-year look-back rule. Here are some ideas to discuss with your tax or financial advisor:
- Spread out large RSU or stock vesting over multiple years if possible
- Avoid combining a home or rental property sale with your final high-income working year
- Coordinate Roth conversions carefully so they do not push you into high IRMAA brackets near age 63–64
- Use tax-advantaged accounts (such as HSA) for medical expenses when appropriate
- Plan the timing of retirement, severance packages and bonuses with Medicare in mind
Every family is different. A strategy that works for one person may not be ideal for another, especially for immigrants, business owners and people with income from multiple countries.
🔗 How IRMAA Fits Into Your Overall Medicare & Retirement Plan
IRMAA is only one piece of the Medicare puzzle. To see the full picture, it helps to understand:
- How Medicare Parts A, B, C and D work and how they interact with Medigap and Medicare Advantage
- Your choices between HMO, PPO and HDHP plans before and after retirement
- How tax-advantaged accounts like FSA and HSA fit into your long-term healthcare strategy
For a big-picture overview, you can also read:
- “Medicare A / B / C / D Explained: Simple Guide to the Red-Blue Card”
- “HMO vs PPO vs EPO vs HDHP – How to Choose?”
- “FSA vs HSA: Still Confused?”
- “Health Insurance After You Leave Your Job: COBRA, ACA & Medicare Transition Guide?”
If you prefer bilingual support and want someone to help you review both the English documents and your family’s real situation, working with a licensed, bilingual advisor can make IRMAA and Medicare planning much less stressful.