The quiet tax
Inflation reduces what each dollar buys. At 3% a year, prices double roughly every 24 years — meaning $100,000 today has the purchasing power of about $55,000 in twenty years. Nothing is deducted from your account; the number simply buys less.
Nominal versus real
Nominal figures ignore inflation; real figures adjust for it. A 5% return during 3% inflation is a real return of roughly 1.9% — not 2%, since the relationship is multiplicative rather than subtractive. All long-range planning should be done in real terms, or the numbers will flatter you badly.
What it means for a retirement plan
A $60,000 annual budget today needs roughly $108,000 a year to maintain the same lifestyle in twenty years at 3% inflation. Retirement targets stated in nominal dollars are meaningless without specifying the year. This is also why holding a substantial equity allocation into retirement is generally recommended — bonds and cash rarely outpace inflation over long horizons.
What tends to keep up
- Equities — companies raise prices, so revenues and earnings tend to rise with inflation over time.
- Real assets — property and infrastructure, with rents that reset.
- TIPS and I-bonds — explicitly indexed to CPI.
- Fixed-rate debt — repaid in depreciating dollars, effectively a hedge.
Your inflation is not the average
CPI is a basket. If you rent in a hot market, pay for childcare, or face rising health premiums, your personal inflation rate can run well above the headline number. Conversely, a paid-off home insulates you from the single largest component. Plan from your own spending, not the index.