Healthcare Inflation in Retirement

Why does a retirement plan that looked solid at 65 start to strain at 85? Often because it inflated healthcare at the same rate as everything else, and healthcare doesn’t play by that rate. It runs hotter, year after year, and the gap compounds into a real shortfall right when you’re least able to fix it.

Healthcare is the one spending category that tends to grow faster than general inflation and rise as you age, a double curve. Treating it like groceries, one modest inflation rate applied across the board, is the quiet modeling error I see in otherwise careful plans.

Two curves, not one

General inflation is one thing. Healthcare inflation is usually higher, and it has historically outpaced the broader consumer price index over long stretches. So a plan that grows your healthcare budget at the same rate as your dining and travel is understating the line that grows the fastest.

Then there’s the age curve sitting on top. Your healthcare spending isn’t flat across retirement, it ramps as you get older, with the heaviest costs, including long-term care, concentrated in the final years. So you’re compounding a higher inflation rate against a base that’s itself rising with age. Two curves multiplying, not one rate.

Where the cost actually lands

It helps to see which pieces move. Medicare premiums rise over time, and the base isn’t trivial. For 2026 the standard Part B premium is $202.90 a month, before any income surcharge. Add Part D, a Medigap premium, and the out-of-pocket costs Medicare doesn’t cover, and a couple’s annual healthcare bill is substantial from day one, then climbs.

For higher-income households, IRMAA stacks on top. At the upper tiers Part B alone runs to $689.90 a month per person in 2026, and that surcharge moves with your income. So your healthcare inflation isn’t only medical price growth, it’s also bracket creep as RMDs and other income push you up the IRMAA ladder. I cover that interaction in IRMAA and MAGI planning.

The category that breaks budgets is long-term care, which inflates fastest of all and arrives in the years your other costs are already peaking. The full risk is in the long-term care checklist and self-funding the math.

The second-order trap

Here’s the compounding effect people underestimate. A small difference in assumed inflation, say two percentage points a year on healthcare, looks harmless on a one-year budget. Run it over a 30-year retirement and the gap is enormous, because compounding doesn’t care that the annual difference felt minor. People are bad at visualizing exponential growth, and this is one of the places it bites hardest.

The result is a plan that’s comfortable in the early years and quietly underfunds the late ones, exactly when healthcare spending peaks and you have the least flexibility to earn or adjust. The error is invisible at 65 and painful at 85. That’s the hidden price of a single flat rate.

How to plan for it honestly

You can’t forecast medical inflation precisely, and I won’t pretend otherwise. But you can stop understating it:

• Inflate healthcare separately and faster than your general spending in any projection. Don’t blend it into one rate.
• Model the age ramp. Assume healthcare costs rise as a share of spending in your later years, not a flat line.
• Carve out long-term care as its own line, inflated at its own steeper rate, rather than burying it in general healthcare.
• Build IRMAA into the picture. As income rises with RMDs, your premiums climb too, so plan income to manage the surcharge brackets.
• Keep a dedicated, liquid healthcare reserve so late-life costs don’t force asset sales at a bad time.
• Use an HSA to pre-fund tax-free, the one account built for exactly this, covered in HSA spending strategy.

Healthcare is the line item that grows the fastest and lands the hardest at the end. Plan it with one tidy inflation rate and you’ve built a plan that’s optimistic precisely where it can least afford to be. Inflate it honestly, separately, and on its own steeper curve, and the late years stop being the part of retirement you didn’t fund.