For retirees, a Social Security cost-of-living adjustment (COLA) can sound like welcome news. But the percentage increase announced for Social Security is only part of the story.

The question that may matter more is:

How much of that increase will actually make it into your pocket?

As we head toward 2027, early projections suggest Social Security recipients could see a larger COLA than they received in 2026. At the same time, Medicare premiums, prescription drug costs, taxes, and other retirement expenses may also change.

That makes this fall an important time to look at your retirement income as a whole—not just one number at a time.

What Is the Social Security COLA?

Each year, Social Security benefits may receive a cost-of-living adjustment designed to help benefits keep pace with inflation.

The COLA is based on inflation data from July, August, and September. Once the final data is available, the Social Security Administration determines the official adjustment for the following year.

Early estimates discussed for the 2027 Social Security COLA have been in the range of approximately 3.2% to 3.5%.

The final number has not yet been announced, so these estimates should be treated as projections.

To put a 3.5% increase into perspective, someone receiving $2,000 per month in Social Security would see an increase of about $70 per month before considering Medicare premiums or other expenses.

And that “before” is important.

A Bigger Social Security COLA Doesn’t Necessarily Mean More Spending Money

A COLA isn’t simply extra money. It is intended to help Social Security benefits keep pace with costs that have already increased.

Groceries, utilities, fuel, healthcare, insurance, and other everyday expenses can all affect how far retirement income stretches.

For many retirees, Social Security is also only one part of the income picture. Other income may come from:

• Pensions
• Retirement accounts and investments
• Savings
• Part-time work
• Other sources of retirement income

That is why retirement planning should look beyond the size of the COLA and consider how all of these pieces work together.

Medicare Part B Can Reduce the Social Security Increase You Actually See

For many Social Security beneficiaries, the Medicare Part B premium is deducted directly from their monthly Social Security payment.

That means when both Social Security benefits and Medicare premiums increase, the amount deposited into your bank account may not rise by the full COLA amount.

For 2027, the standard Medicare Part B premium has been projected to increase again. However, that amount is not final.

This distinction matters when you’re planning a retirement budget.

For example, if a retiree receives a $70 monthly Social Security increase but their Medicare premium also rises, their actual increase in spendable income will be less than $70.

The important number isn’t simply your new Social Security benefit.

It’s what you have left after healthcare costs and other expenses are considered.

What Is Medicare’s Hold Harmless Provision?

There is some protection for certain Medicare beneficiaries through what’s known as the hold harmless provision.

Generally, for many people who have their Medicare Part B premium deducted from Social Security, an increase in the Part B premium cannot cause their Social Security payment to decrease from one year to the next because of the premium increase alone.

However, this protection does not apply to everyone.

Certain beneficiaries—including some people who are new to Medicare and higher-income beneficiaries subject to income-related Medicare surcharges—may be treated differently.

Understanding which rules apply to you is another reason not to base your retirement planning on general averages alone.

Don’t Forget About Medicare Part D Changes

Prescription drug coverage deserves special attention heading into 2027.

Changes to deductibles, premiums, formularies, and out-of-pocket costs can affect what you actually spend during the year.

One particularly important point: your current prescription drug plan may not necessarily be your best option next year.

Even if you are happy with your current plan, the plan itself can change.

Your medications may move to different tiers. A drug could be removed from the formulary. Your preferred pharmacy’s pricing could change. Premiums and other cost-sharing requirements can also change.

That makes an annual Medicare review especially important.

Rather than looking at premium alone, consider:

• Are all of your medications still covered?
• Have any medications changed tiers?
• Is your preferred pharmacy still cost-effective?
• Has the deductible changed?
• What could your total annual prescription costs look like?
• Have your doctors or healthcare needs changed?

The least expensive monthly premium isn’t necessarily the least expensive plan overall.

Social Security and Medicare Should Be Reviewed Together

One of the biggest takeaways for retirees is that Social Security and Medicare shouldn’t be viewed as completely separate pieces of your retirement plan.

One affects the money coming in.

The other can affect how much goes out.

And both can interact with taxes and your overall retirement income strategy.

Fall is a particularly useful time to review these pieces because Medicare’s Annual Enrollment Period runs from October 15 through December 7.

During this period, Medicare beneficiaries have an opportunity to review their current coverage and, when appropriate, make changes for the upcoming year.

Instead of automatically keeping the same plan, take the time to see what has changed.

IRMAA Can Also Affect Your Medicare Costs

Higher-income retirees may also need to consider the Income-Related Monthly Adjustment Amount, commonly called IRMAA.

IRMAA is an additional amount some beneficiaries pay for Medicare Part B and Part D based on income.

One detail that often surprises retirees is that Medicare generally looks at tax information from two years earlier when determining whether IRMAA applies.

That can create complications when your financial situation has changed significantly since then.

Retirement, reduced work hours, loss of income, or other qualifying life-changing events may mean an older tax return no longer reflects your current circumstances.

This is another area where planning ahead can make a meaningful difference.

Social Security Taxes Are Another Piece of the Puzzle

A larger Social Security benefit may also affect taxes for some retirees.

The taxation of Social Security depends on your overall income situation, not simply the amount of your Social Security check.

Withdrawals from retirement accounts, pensions, investment income, wages, and other income sources can all interact with Social Security taxation and Medicare costs.

That is why decisions about where your retirement income comes from can be just as important as how much income you receive.

A decision that looks good when viewed by itself may have an unintended effect somewhere else.

The Goal Is to Know What Your Retirement Income Really Looks Like

Retirement planning isn’t about trying to predict every future expense perfectly.

It’s about understanding how the different pieces work together so you’re less likely to be surprised.

As 2027 approaches, consider reviewing your:

Social Security income
What will your benefit look like after the official COLA is announced?

Medicare costs
How could changes to Part B, Part D, Medicare Advantage, or supplemental coverage affect your budget?

Prescription medications
Are your medications still covered, and what might they cost under your plan next year?

Taxes
Could changes in income affect the taxation of Social Security or your Medicare IRMAA surcharge?

Retirement withdrawals
Could the timing and source of withdrawals affect other areas of your financial plan?

Looking at these items together can give you a much clearer picture of what is actually coming in—and what is going out.

Planning for 2027 Starts Before January

It can be tempting to wait until January to see how everything shakes out.

But by then, some important decisions may already have been made.

The better approach is to use the fall to review your Social Security, Medicare coverage, healthcare expenses, taxes, and retirement income strategy together.