At 3% average inflation, $1 today buys only $0.41 in 30 years. Failing to plan for inflation is the single most common — and most preventable — retirement planning mistake.
Inflation is unique among retirement risks: it's gradual, invisible year-to-year, and catastrophic over decades. A retiree who carefully plans $60,000/year in expenses at age 65 will need $116,000/year at age 85 to maintain the same lifestyle, assuming just 3.4% average inflation (the long-run U.S. average). Most retirement plans underestimate this.
Put differently: if you're planning to retire at 65 and live to 95, your $60,000 annual budget needs to be thought of as needing $97,000+ of nominal spending power at age 85, and $130,000+ at age 90. Any portfolio that doesn't account for inflation will systematically underfund these later years.
Medical Inflation Is Faster
While general CPI has averaged around 3.5% over the long run, medical care CPI has run closer to 4.5%, a gap of roughly one percentage point a year that compounds meaningfully over a 30-year retirement. For retirees where healthcare represents 15–30% of total spending, blended inflation runs noticeably higher than general CPI. This makes the healthcare cost projection problem even more severe.
Long-run medical care CPI data| Strategy | Inflation Protection | Tradeoff |
|---|---|---|
| Stocks (equities) | Strong over 10+ years | High short-term volatility |
| Social Security | Excellent — CPI-adjusted annually | Income limited by earnings history |
| TIPS (Treasury bonds) | Principal adjusts with CPI | Lower real yields than stocks |
| Real estate / REITs | Good — rents tend to rise with inflation | Illiquid, concentration risk |
| Nominal bonds | None — worst in high inflation | Stability but no inflation hedge |
| Cash/CDs | Short-term only if rates > inflation | Loses real value when rates lag |
Why Equities Win Long-Term
Over 20-30 year periods, equities have outpaced inflation by 4-5% annually in real terms. Company revenues, profits, and dividends tend to grow with — and often ahead of — general price levels. This is why most retirement plans keep 40-60% in equities even in retirement: it's the most reliable long-term inflation hedge available.
Apply the strategies in this article to your specific situation. FuturePath models your portfolio with 1,000 Monte Carlo simulations across 50-state tax rules.