# The Real Retirement Number After Inflation
Most retirement planning conversations happen in nominal dollars — the raw numbers on statements and calculators. But retirement is lived in real dollars: what your money actually buys, adjusted for rising prices. A $1 million portfolio is a benchmark, but $1 million in 2045 buys significantly less than $1 million today.
What inflation does to purchasing power
At 3% annual inflation, purchasing power halves roughly every 24 years. $50,000 in annual spending today requires approximately: - $67,000 in 10 years - $90,000 in 20 years - $121,000 in 30 years
...to buy the same things.
This is why the 4% rule adjusts withdrawals for inflation each year. Your first-year $40,000 withdrawal becomes $43,200 in year 3, $53,000 in year 10, and $97,000 in year 30 — all representing the same real purchasing power as your original $40,000.
The healthcare inflation problem
General CPI inflation runs 2–4% historically. Healthcare inflation runs 5–7%. For retirees, healthcare is typically the fastest-growing cost category — and one that scales with age. A retirement portfolio optimized for average CPI inflation may be systematically underfunded for the real cost profile of late retirement.
Factoring in 5% healthcare inflation for the healthcare portion of spending produces a materially different portfolio target than assuming uniform 3% inflation.
Interactive Model
Inflation Erosion in Retirement
See how inflation inflates required spending and erodes real portfolio value over time.
Spending today
$50,000
Required in yr 30
$146,930
194% more
Portfolio real value in yr 30
$411,987
In today's dollars
Required annual spending over 30 years
Healthcare inflation modeled separately from general CPI. Real portfolio value uses general CPI only. Does not include portfolio returns.
Inflation protection in a portfolio
**TIPS (Treasury Inflation-Protected Securities)** adjust principal with CPI. The interest rate is lower than comparable nominal treasuries, but the real return is guaranteed to match inflation. TIPS provide direct purchasing power protection for the bond portion of a portfolio.
**I-Bonds** (Series I Savings Bonds) offer inflation-linked returns with tax deferral, capped at $10,000/year per person. For the first layer of inflation protection, they are one of the best instruments available.
**Equities** are the primary long-term inflation hedge in most retirement portfolios. Companies can raise prices; equity returns historically outpace inflation over 20+ year periods. The volatility makes equities unsuitable as a short-term inflation hedge but essential for long-term real return.
**Real estate** (via REITs or direct ownership) provides another inflation-linked return stream — rents and property values historically track inflation over long periods.
The real return framing
The most honest retirement planning frames everything in real (inflation-adjusted) terms. Your target withdrawal rate should be applied to a portfolio large enough to fund your real spending needs, not just your nominal spending today. If you plan to spend $50,000/year in today's dollars, your FIRE number should reflect the real purchasing power of that amount — not just the nominal figure.
---
*Related: [The 4% rule](./real-math-behind-4-percent-rule) adjusts withdrawals for inflation annually — this article explains why that matters. [The cost of expense ratio drag](./expense-ratio-drag) is the other compounding cost that reduces real returns.*