Social Security and Medicare adjustments happen every year. The Social Security Administration announces a cost-of-living adjustment (COLA) each October, and the Centers for Medicare and Medicaid Services (CMS) typically follows with updated premiums and deductibles shortly after. These changes directly affect retirement income, and understanding how they interact helps you plan more accurately.
How the Social Security COLA Works
The SSA calculates the annual COLA using the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). If the index shows inflation, benefits increase. If it does not, benefits stay flat. There is no mechanism for benefits to decrease due to deflation.
Recent COLAs have ranged from 0% (in years with no measured inflation) to 8.7% (2023, following a period of elevated inflation). The 2025 COLA was 2.5%, and the 2026 COLA is 2.8%.
For context, the Social Security taxable wage base also adjusts annually. For 2025, earnings up to $176,100 are subject to Social Security tax. For 2026, that cap rises to $183,600. This matters for higher earners and for anyone calculating future benefit estimates.
What this means in practice: If your monthly Social Security benefit is $2,000 and the COLA is 2.8%, your new benefit is approximately $2,056 per month. That sounds like a raise, but it may be partially or fully offset by Medicare premium increases.
Medicare Premium and Deductible Adjustments
Medicare costs also change annually. The three numbers that affect most retirees are the Part B premium, the Part B deductible, and the Part A deductible.
Medicare Part A covers hospital stays. Most beneficiaries pay no premium for Part A (if they or a spouse paid Medicare taxes for at least 40 quarters). However, each hospital admission carries a deductible that adjusts annually. For 2026, the Part A inpatient hospital deductible is $1,736, up from $1,676 in 2025.
Medicare Part B covers outpatient care, doctor visits, and preventive services. Part B requires both a monthly premium and an annual deductible. The standard Part B premium is deducted directly from your Social Security check. For 2026, the standard Part B premium is $202.90 per month (up from $185.00 in 2025), and the Part B annual deductible is $283 (up from $257 in 2025).
The hold harmless provision. In years when there is no Social Security COLA, most beneficiaries are protected from Part B premium increases by the hold harmless rule. Their net Social Security payment cannot decrease due to a Medicare premium hike. However, in years with a COLA (which is most years), Part B premiums can and do increase, sometimes absorbing a meaningful portion of the COLA.
This is the dynamic that frustrates many retirees: the COLA is intended to keep up with inflation, but Medicare premium increases eat into it. In some years, the net increase in take-home Social Security after Medicare deductions is minimal.
IRMAA: The Medicare Surcharge for Higher Earners
Income-Related Monthly Adjustment Amounts (IRMAA) are surcharges on Medicare Part B and Part D premiums for beneficiaries whose modified adjusted gross income (MAGI) exceeds certain thresholds. IRMAA is based on your tax return from two years prior (the most recent return the IRS has processed).
This is particularly relevant for retirees who have income spikes from Roth conversions, capital gains, pension lump sums, or the sale of a business or property. A single high-income year can trigger IRMAA surcharges that persist until a new, lower-income tax return cycles through.
2026 IRMAA Brackets for Medicare Part B
The following table shows the 2026 Part B monthly premiums based on MAGI from your 2024 tax return. These thresholds are adjusted annually. IRMAA uses a cliff structure, meaning even $1 over a threshold triggers the higher premium for the entire year.
| Single Filer MAGI | Joint Filer MAGI | Monthly Part B Premium |
|---|---|---|
| $109,000 or less | $218,000 or less | $202.90 (standard) |
| $109,001 to $137,000 | $218,001 to $274,000 | $284.10 |
| $137,001 to $171,000 | $274,001 to $342,000 | $405.80 |
| $171,001 to $205,000 | $342,001 to $410,000 | $527.50 |
| $205,001 to $499,999 | $410,001 to $749,999 | $649.20 |
| $500,000 or more | $750,000 or more | $689.90 |
Source: CMS 2026 Medicare Parts A & B Premiums and Deductibles. Verify current figures at Medicare.gov.
At the highest bracket, you would pay $689.90 per month for Part B alone, compared to $202.90 at the standard rate. That is an additional $5,844 per year, per person. For a married couple both on Medicare, the surcharge can exceed $11,600 annually.
Planning note: If you experienced a life-changing event (retirement, death of a spouse, divorce, loss of income-producing property), you can file SSA Form SSA-44 to request a reduction in IRMAA based on current income rather than the two-year-old return.
SSI and SSDI: How Changes Affect Disability Beneficiaries
Social Security Disability Insurance (SSDI) benefits receive the same COLA as retirement benefits, since SSDI is calculated from the same benefit formula.
Supplemental Security Income (SSI) also receives an annual COLA, though SSI is a needs-based program with strict asset and income limits. The federal SSI benefit rate adjusts each January. Some states supplement the federal SSI payment with their own additional amount.
For families doing special needs planning, the interaction between benefit increases and resource limits matters. An increase in SSI does not change the $2,000 individual resource limit (or $3,000 for couples). Accumulating benefits above the resource limit can jeopardize eligibility. This is one reason ABLE accounts and special needs trusts are critical tools for preserving benefits while building financial security.
What to Do Each Year
When the SSA and CMS announce changes (typically in October and November for the following year), here is how to incorporate them into your plan:
Recalculate your retirement income projection. Update your Social Security benefit amount and net it against the new Medicare premiums. If you rely on Social Security as a primary income source, even small net changes compound over time.
Check IRMAA exposure. If you are planning a Roth conversion, stock option exercise, or property sale, model the income impact against IRMAA thresholds two years out. The surcharge can add hundreds of dollars per month to your Medicare premiums.
Review your Medicare coverage during open enrollment. Medicare open enrollment runs from October 15 to December 7 each year. This is when you can switch between Original Medicare and Medicare Advantage, change Part D prescription drug plans, or adjust supplemental coverage. Premium and formulary changes happen annually, so reviewing your coverage every year is essential.
Update your withdrawal strategy. If you are drawing from multiple accounts (Social Security, Traditional IRA, Roth IRA, taxable accounts), the COLA and premium changes may warrant adjusting the mix to optimize your tax bracket and Medicare costs.
The Bigger Picture
Annual Social Security and Medicare changes are incremental on their own, but they compound. Over a 20- to 30-year retirement, the cumulative effect of COLAs, premium increases, IRMAA exposure, and tax bracket management is significant. Building these adjustments into your annual financial review keeps your retirement income plan calibrated to reality rather than running on outdated assumptions.
For help integrating Social Security and Medicare planning into your broader retirement strategy, start a conversation with us or explore our retirement planning resources.
