What Inflation Actually Erodes in Retirement — and What It Doesn’t

Most retirement plans treat inflation as a single number — a 3% line you apply across the board and forget about. That’s the version of inflation that ends a retirement plan before its time.

Inflation in retirement is not one number. It’s a basket of categories, each running at a different speed, and a few of them barely run at all. A plan built on the average misses the shape of the problem entirely. The cost lines that quietly compound for thirty years are the ones that decide whether a portfolio lasts. The ones that stay flat are the reason a paid-off house is one of the most underrated retirement assets in America.

This piece is about pulling that one inflation number apart — which categories actually erode purchasing power in retirement, which ones don’t, and what to do about it long before the erosion shows up in the checking account.

The inflation number you’re shown is not the one you’ll live

The headline Consumer Price Index — CPI-U — is built around the spending pattern of an urban worker. The Bureau of Labor Statistics also publishes an experimental index called CPI-E, designed around households where the reference person is 62 or older. Over most multi-decade windows, CPI-E runs slightly hotter than CPI-U, mostly because retirees spend a larger share of their budget on the categories that inflate fastest. The Social Security cost-of-living adjustment uses a third index — CPI-W — which tracks urban wage earners and is structurally closer to CPI-U than to CPI-E.

The practical version of that mismatch: the inflation number on the evening news, the inflation number the Federal Reserve targets, and the inflation number Social Security uses for its annual COLA are all the same shape — but none of them are your shape. The retiree’s basket is its own thing, and inside that basket, three categories do most of the damage.

The three categories that compound mercilessly

If I had to write the inflation story of a thirty-year retirement on a napkin, it would be three lines.

Healthcare. Medical inflation has run substantially above headline inflation for decades, and the Medicare beneficiary’s out-of-pocket share — Part B premiums, Part D premiums, Medigap or Advantage premiums, dental, vision, hearing, long-term care — does not shrink with age. It grows. Fidelity’s annual retiree healthcare estimate has crossed $165,000 for a 65-year-old couple in recent years, and that number compounds across the rest of a retirement. The cruel structural feature of healthcare inflation is that it shows up exactly when income is least flexible.

Services. Anything that depends on someone’s time tends to inflate at or above wage growth — home repair, plumbing, electrical work, dental, veterinary, professional services, restaurants, landscaping, hairstyling. This is the category most people underestimate, because they’re used to thinking about goods inflation. A 30-year retirement is one in which the cost of having anyone do anything in your home roughly doubles, and then doubles again.

Property tax and assessment-based costs. If your home appreciates, your property tax bill appreciates with it in most jurisdictions. Homeowners insurance is having a separate, sharper inflation event right now — premiums in coastal and wildfire-exposed states have risen by double digits multiple years in a row. HOA dues and utility bills are not far behind. The line item that says “I own the house outright” hides a real ongoing cost that does inflate.

These three categories — healthcare, services, and assessment-based home costs — are where the thirty-year inflation story actually happens for most retirees.

The categories that don’t inflate the way people fear

The other half of the picture is the part that almost nobody plans for, because it doesn’t fit the narrative.

A paid-off mortgage is the single best inflation hedge a household will ever own. A fixed payment on a fixed schedule is, by definition, eroded by inflation rather than amplified by it. The dollar amount of the principal-and-interest line stays flat for thirty years while wages and prices around it climb. If the mortgage is gone entirely by the time you stop working, that entire line item goes to zero and stays there — the most powerful expense reduction in the household budget, locked in for life. This is why I tell pre-retirees that paying down a mortgage in the five years before retirement is one of the highest-leverage moves they can make, even when the after-tax math on paper says otherwise. It’s not a math move. It’s an inflation move.

Most durable goods get cheaper in real terms over a long retirement. Televisions, computers, kitchen appliances, basic furniture, most categories of consumer electronics — these have been deflationary or roughly flat for decades, and they keep delivering more capability per dollar each cycle. A retiree who already owns a house full of working appliances is not going to be ruined by replacing them.

Communications, software, and most subscription technology run flat-to-deflationary. The phone plan, the internet bill, the streaming services — these have not been the runaway category most people expected fifteen years ago. They tend to stay in a narrow band, and competition keeps a lid on them.

Even some food categories misbehave. Grocery inflation comes in waves, not in a smooth line, and over a decade it tends to mean-revert closer to headline than people remember during the painful stretches. Restaurant inflation is a services category and behaves like one. They’re not the same story.

The takeaway isn’t that costs go down. It’s that the categories that compound and the categories that don’t are wildly different lines on the same chart, and treating them as one average makes the planning math worse, not better.

Why “average inflation” is the wrong frame for a thirty-year horizon

Here’s the part that matters for plan construction. When you apply a single 3% inflation rate to a single annual spending number across a thirty-year retirement, you’re assuming that the basket you’re spending on today is the basket you’ll be spending on at 85. That’s never true.

In the first decade of retirement, discretionary spending — travel, restaurants, hobbies, gifts to grandchildren — tends to be heavier than it will be later. Most retirement spending studies find a “go-go, slow-go, no-go” pattern, with real spending peaking in the early 60s and gradually declining through the 70s and 80s. The David Blanchett research on retirement spending — published through Morningstar and widely cited — found that real spending in retirement actually declines by roughly 1% per year on average, even before adjusting for the late-life healthcare spike.

That late-life healthcare spike is the second half of the same story. In the last five to ten years of life, healthcare spending — particularly long-term care — can dominate the household budget. The shape of retirement spending isn’t a flat line growing with inflation. It’s a discretionary plateau early, a slow real decline in the middle, and a healthcare-driven spike at the end. Building a plan around the average of all that distorts both ends of the retirement.

If you want to see the shape of your own retirement under different inflation paths — heavy healthcare, light discretionary, fast property tax, slow tech — a scenario tool that lets you model multi-category inflation is more useful than any single number. I use ProjectionLab for this kind of category-level modeling; it lets you split inflation assumptions across spending lines so the “average” gets stress-tested honestly. Affiliate disclosure: I receive a small commission if you sign up through that link, at no additional cost to you. I link to it because I use it; if it didn’t earn its place in my workflow, it wouldn’t earn its place in a TCA post.

A hypothetical case: Margaret at 64

Consider a hypothetical case. Margaret is 64, retiring next year in suburban Charlotte. She has a paid-off house, $720,000 in tax-deferred and Roth accounts combined, and Social Security that will be roughly $2,800 a month if she claims at her full retirement age of 67. Her annual essential spending — property tax, insurance, utilities, groceries, healthcare premiums and out-of-pocket, household maintenance — runs about $48,000. Her discretionary spending — travel, restaurants, grandkid gifts, hobbies — runs about $22,000.

If she applies a flat 3% inflation rate to that combined $70,000 across a thirty-year retirement, she ends up with a single intimidating number for year 30. If she pulls it apart, the picture is different and the planning gets sharper.

Her property tax and homeowners insurance line — about $7,800 a year today — runs hot. Even at a modest 4% annual escalation, that’s about $25,000 a year by her late 80s. Her healthcare line, currently about $9,000 a year out of pocket, is on a separate compounding curve and could realistically double or triple in real terms by then. Her services line — home and yard maintenance, dental, professional services — is going to grow with wages, which historically run above headline inflation.

But her discretionary line is unlikely to grow at all in real terms; she’ll probably spend less on travel in her 80s than her 60s. Her food line will mean-revert. Her technology line will stay roughly flat. And the line that was never there — the mortgage payment she finished off five years ago — is now permanently absent from the budget.

The point of pulling it apart is not to make the math more pessimistic. It’s to put the defense in the right place. Margaret doesn’t need protection on her whole basket. She needs protection on the categories that actually compound.

The four defenses that actually work

If three categories drive most of the inflation damage in retirement, then four defenses do most of the work in absorbing it.

1. Delay Social Security if you can. Social Security is the only major income source in retirement that gets a meaningful inflation adjustment every year, applied to a base that grows roughly 8% for each year of delay between full retirement age and 70. Delaying claim until 70 doesn’t just produce a larger check — it produces a larger inflation-adjusted base that the COLA then compounds against for the rest of your life. For most pre-retirees, delaying Social Security is the highest-leverage inflation hedge they have access to.

2. Build a real income floor in the Soon bucket. An income floor that covers essential expenses removes the need to sell investments during inflation spikes. Social Security plus pensions plus, where appropriate, a Fixed Index Annuity with a guaranteed lifetime income rider — these become the components of an income floor designed to handle the essential basket. The Soon bucket is where guaranteed income lives, and it’s the bucket that protects you specifically from having to sell stocks at the wrong time because the property tax bill went up. Variable annuities do not belong here; their market-linked principal is the opposite of what an income floor is supposed to do.

3. Keep the Later bucket allocated for real growth. The Later bucket — the long-horizon money — exists in part to outrun inflation. The instinct to de-risk everything at retirement is one of the most expensive mistakes a retiree can make in the face of a thirty-year horizon. The Later bucket should hold the equity allocation that lets real purchasing power keep up with the categories that compound. Risk capacity, not just risk tolerance, governs this decision. A retiree with a Soon-bucket income floor has the risk capacity to stay invested through downturns.

4. Make the structural inflation moves before they’re needed. Pay down the mortgage before retirement if it’s close. Lock in homeowners insurance with a carrier that has a track record in your region. Review property tax assessments and use any senior-freeze programs your state offers. Maximize HSA contributions in the working years and use the HSA as the dedicated healthcare-inflation defense it was designed to be. These are not glamorous moves. They are the ones that quietly change the shape of the inflation problem before the inflation problem shows up.

How this lands in a bucket plan

The Now/Soon/Later framework is built around the same idea that animates this piece: different money does different jobs. Inflation defense follows the same logic. The Now bucket protects liquidity. The Soon bucket protects the income floor against the categories that compound. The Later bucket protects long-term real purchasing power. No single bucket carries the whole load, and no single inflation number carries the whole story.

If you take one thing from this: stop applying one inflation rate to your whole budget. The categories that compound mercilessly need a real defense — guaranteed income, structural moves, an income floor sized to the essential basket. The categories that don’t can be left alone. The plan that knows the difference is the one that lasts.

For a deeper walkthrough of how the income floor gets built in the first place, my earlier piece on building the income floor from scratch covers the construction sequence. The companion piece on sizing the Soon bucket walks through how to figure out your essential-basket number — which is the number this whole conversation is actually about. And if you want the upstream framework, the foundational Now/Soon/Later piece ties it all together.

This article is published by Confluence Media Group LLC, an independent publisher of educational financial content. Thomas Clark is a Series 65 Investment Advisor Representative. The information provided is for educational and informational purposes only and is not personalized financial, tax, or legal advice. Past performance does not guarantee future results. All investing involves risk, including potential loss of principal. Consult a qualified professional before making financial decisions.

Confluence Media Group LLC is a separate entity from Confluence Capital Management, the investment advisory practice through which Thomas Clark provides advisory services. Advisory services are not offered through this publishing platform.

About Thomas Clark

Thomas Clark is the founder of Confluence Media Group LLC and a Series 65 Investment Advisor Representative. He has spent nearly two decades working with families on retirement planning, with a focus on Social Security optimization, retirement income coordination, and the bucket planning approach to building a guaranteed income floor.

Thomas writes and publishes at thomasclarkadvisor.com and is the author of The Just in Case Binder — a 148-page printable family financial organizer for households who want to make sure the people they love know where everything is.

He lives in North Carolina with his family.

Subscribe to the weekly newsletter · Get the Just in Case Binder

Thomas Clark

Thomas Clark is a Series 65 licensed investment advisor and experienced trader. He specializes in investing, retirement planning, and market analysis, helping individuals build wealth and make informed financial decisions.