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Inflation is back in the headlines.

Consumer prices rose 3.4% over the 12 months ending in August, according to the Bureau of Labor Statistics, with gas prices doing a lot of the heavy lifting. Next week, the Social Security Administration will announce how much benefits will rise in 2027, and early estimates point to the biggest bump in three years.

Most of us feel inflation at the grocery store or the gas pump. But the place it can do the most damage is somewhere you probably aren't looking every day... your retirement plan.

Retirement planning is built on assumptions. What you'll spend. What your investments will earn. What Social Security will pay. How long the money has to last. When prices rise faster than expected, every one of those assumptions starts to wobble.

The good news? You don't need to predict inflation to protect yourself from it. You just need a plan that expects it.

The Number You're Saving Toward Is a Moving Target

Inflation's core trick is simple: Over time, the same dollar buys less.

Say your household spends $100,000 a year to live the way you live now. If inflation averages 3%, that exact same lifestyle — same house, same groceries, same everything — would cost about:

- $116,000 in five years 
- $134,000 in 10 years 
- $181,000 in 20 years

Nobody got more extravagant. Prices just kept doing what prices do.

Here's another way to look at it: At 3% inflation, a dollar loses about half its purchasing power in 24 years.

So if you're 45 and picturing a "comfortable" $100,000-a-year retirement, that picture is in today's dollars. Twenty years from now, $100,000 will buy something closer to what $55,000 buys today.

And inflation doesn't clock out when you do. A 65-year-old retiree may still be paying rising prices at 75, 85 and 95. Your plan has to account for inflation before and after you stop working.

Inflation Also Speeds Up Your Withdrawals

Once you retire, inflation creates a second problem: You have to pull more money out of your portfolio every year just to stand still.

Say you retire with $2 million and withdraw $80,000 in your first year, which lines up with the well-known "4% rule" of thumb. If your costs rise 3% a year, keeping the same purchasing power means withdrawing about $104,400 in Year 10 and $140,300 in Year 20.

Your remaining investments should keep growing in the meantime, which helps. But rising withdrawals plus market volatility can squeeze a portfolio hard, especially if inflation runs hotter than planned or the market drops early in retirement, when your balance is largest and you can least afford to sell low.

That's why retirement planning can't just be about hitting a magic account balance. How you spend that money after you get there matters just as much.

Won't Social Security Cover It?

Partly.

Social Security benefits get an annual cost-of-living adjustment, or COLA. For 2026, benefits rose 2.8%. That's a genuinely valuable feature; very few other income sources come with built-in inflation protection.

But a COLA isn't a guarantee that your purchasing power stays intact. The adjustment is based on the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W), which tracks the spending of working households, not retirees. Retirees tend to spend a larger share of their budgets on health care and housing, costs that often rise faster than prices overall.

Medicare is a good example. The standard Part B premium, which is typically deducted straight from Social Security checks, jumped nearly 10% to $202.90 a month in 2026, eating into a 2.8% COLA before retirees saw a dime of it.

And for most households, Social Security was never meant to be the whole plan. It's the foundation, not the house.

5 Ways to Inflation-Proof Your Retirement Plan

You can't control inflation. You can control how exposed your plan is to it.

1. Rerun Your Numbers — With Inflation Turned On

If you haven't updated your retirement projections in a few years, now is the time.

Start with what you actually spend today, then use a retirement calculator that adjusts for inflation rather than assuming today's dollars will stretch just as far in 2046.

Then stress-test it. Here's what that $100,000 lifestyle costs in 20 years at different inflation rates:

- At 2%, about $149,000
- At 3%, about $181,000
- At 4%, about $219,000

That's a $70,000-a-year spread from a two-point difference. You don't need to guess the right number. You need to know how much a wrong guess would hurt.

2. Turn Up Your Contributions, Even a Little

The most reliable way to cover higher future costs is to save more while you're still earning.

It doesn't have to be dramatic. An extra $200 a month could grow to about $92,400 over 20 years, assuming a hypothetical 6% annual return compounded monthly.

Better yet, give part of every raise to Future You. If your paycheck goes up 4% and you send even a quarter of that increase to your 401(k), you'll barely notice the difference today, and your retirement will notice it a lot.

3. Don't Get Too Safe Too Soon

As retirement approaches, it's natural to want to dial back risk. That instinct is sensible, up to a point.

But moving too much money into cash or other low-yielding holdings creates a different risk: Your savings may not grow fast enough to keep up with prices. Cash that earns less than inflation isn't safe. It's losing value slowly instead of quickly.

A diversified portfolio with an appropriate stake in stocks can keep providing growth well into retirement. And if you want direct inflation protection, look at Treasury Inflation-Protected Securities (TIPS), whose principal adjusts with the Consumer Price Index.

The right mix depends on your age, finances, risk tolerance and timeline. The goal isn't to swing for the fences. It's to balance stability today with growth you'll need in Years 15, 20, and 25.

4. Know Which Expenses Can Bend

Not every retirement expense is equally essential.

Housing, utilities, groceries, insurance and health care are hard to cut. Travel, dining out, entertainment and big discretionary purchases usually aren't.

Say you plan to spend $120,000 a year in retirement, and $25,000 of that is discretionary. That's roughly 20% of your budget you could dial back in a year when inflation spikes or the market slumps, without touching the essentials or selling investments at a bad time.

That's not giving up the retirement you planned. It's giving yourself a shock absorber.

5. Plan Extra Cushion for the Costs That Outrun Inflation

A single inflation assumption is a good starting point, but some retirement costs don't play by the average.

Health care is the big one. Fidelity estimates that a 65-year-old retiring in 2026 will spend an average of $185,500 on health care and medical expenses in retirement, up 7.5% from last year's estimate, and that's before long-term care.

Property taxes, homeowners insurance and home maintenance can also rise faster than overall prices. And some expenses, like medical care or help with daily activities, tend to climb as you age.

Review your insurance coverage, build health care costs into your projections explicitly, and keep a cash cushion so one big bill doesn't force you to rework your whole plan.

Your Plan Isn't a Monument. It's a Map.

Inflation is a real threat to retirement plans. It is not a reason to assume your goals are out of reach.

The bigger danger is building a plan on assumptions that stopped being true years ago, and never checking it again.

Prices change. Markets change. Your income, health and priorities change. Your retirement plan should change with them. Revisit your savings rate, investment mix, expected expenses and withdrawal strategy at least once a year, and you'll spot shortfalls while there's still time to fix them.

You don't need to know what a gallon of milk will cost in 2050.

You just need a plan flexible enough to handle whatever it turns out to be.