A Four-Part Blog Series from Otium Financial Planners

This series explores how longer lifespans, inflation, Social Security, Medicare, healthcare costs and investment planning interact over a retirement that may last 25 to 35 years.

Blog 3: Social Security vs. Medicare: Does Your Retirement Income Really Keep Up With Inflation?

In Part 2 of our longevity series, we looked at what inflation can do over a 20- or 30-year retirement.

Fortunately, retirees have one particularly valuable source of inflation-adjusted income: Social Security.

Social Security benefits receive annual cost-of-living adjustments, or COLAs. But there's a complication. Retirees don't experience inflation in a vacuum. Healthcare expenses, including Medicare premiums, can rise faster than the overall inflation rate.

That can consume part of the increase retirees receive from Social Security.

How Social Security's COLA Works

Social Security's COLA isn't simply a number selected each year by Congress. It is tied to inflation.

Specifically, Social Security uses the Consumer Price Index for Urban Wage Earners and Clerical Workers, or CPI-W.

The calculation compares the average CPI-W during July, August and September with the corresponding third-quarter average used to determine the previous COLA. When the index rises, Social Security benefits generally increase.

For 2026, Social Security benefits increased 2.8%. That inflation protection is extraordinarily valuable during a long retirement.

A private pension paying $2,000 per month with no cost-of-living adjustment could still be paying exactly $2,000 twenty years from now. Social Security is designed differently.

Social Security Helps, but It Doesn't Match Every Retiree's Inflation

There is an interesting issue with the way the COLA is calculated. CPI-W reflects the spending patterns of working households. Retired households often spend their money differently.

Healthcare is the most obvious example. Older households tend to spend a larger portion of their budget on medical expenses than younger working households.

That means a retiree could receive a Social Security COLA that accurately reflects CPI-W while experiencing a higher personal rate of inflation.

Medicare Provides a Real-World Example

For 2026, the standard Medicare Part B premium increased from $185.00 per month in 2025 to $202.90 per month in 2026.

That's a $17.90 monthly increase, or approximately 9.7%. Meanwhile, Social Security's COLA was 2.8%.

The difference illustrates why retirees should pay attention to more than the headline inflation rate.

What Does That Mean for an Actual Retiree?

Consider a retiree receiving $2,000 per month in Social Security before the 2026 COLA.

A 2.8% COLA adds $56 per month, or $672 per year.

The standard Medicare Part B increase costs $17.90 per month, or $214.80 per year.

That means approximately 32% of the retiree's Social Security COLA was consumed just by the increase in the standard Medicare Part B premium.

The retiree is still ahead. But the entire $56 increase isn't available to pay for groceries, utilities, property taxes, travel or other expenses. After the Part B increase, the retiree has approximately $38.10 per month of the COLA remaining.

And that's before considering changes in:

·        Medicare supplement premiums

·        Medicare Advantage expenses

·        Prescription drugs

·        Dental care

·        Vision care

·        Deductibles

·        Copays

·        Long-term-care costs

Medicare Isn't the Only Healthcare Inflation Risk

The latest CPI data also demonstrate how individual healthcare expenses can move differently. For the 12 months ending June 2026:

Not every healthcare category rises faster every year. But retirees typically have more exposure to these expenses than younger households. That makes healthcare inflation particularly important in retirement projections.

Medicare's Hold-Harmless Rule Helps

There is an important protection for many Social Security recipients called the hold-harmless provision.

Generally, it prevents an increase in the standard Medicare Part B premium from causing a person's net Social Security benefit to decline from one year to the next solely because of that premium increase.

But the protection doesn't apply to everyone. Higher-income Medicare beneficiaries paying IRMAA, some new Medicare beneficiaries and certain other recipients may not receive the same protection.

And the provision doesn't protect retirees against increases in all their other healthcare expenses.

Why This Matters Over 30 Years

Someone retiring at 65 and living to 95 experiences 30 years of Social Security COLAs, Medicare premium changes and healthcare inflation.

Social Security provides an important inflation hedge, but it isn't a complete retirement inflation strategy.

A comprehensive retirement plan should coordinate:

·        Social Security claiming decisions

·        Medicare premiums

·        IRMAA

·        Healthcare inflation

·        Investment withdrawals

·        Taxes

·        Cash reserves

·        Long-term investment growth

·        Potential long-term-care expenses

Social Security Helps, but It Isn't a Complete Inflation Strategy

Social Security's annual cost-of-living adjustment provides valuable inflation protection, particularly for someone who may spend 20 or 30 years in retirement.

But retirees don't spend money according to a government inflation index. Healthcare, Medicare premiums, housing and other expenses can increase at very different rates.

That makes it important to look at retirement income and retirement expenses together rather than assuming a Social Security COLA will automatically preserve purchasing power.

Otium Financial Planners can help you evaluate how Social Security, Medicare, healthcare expenses, taxes and investment withdrawals may interact throughout retirement.