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Inflation vs. Your Savings: What Five Quiet Years Do to Money That Sits Still
Entry № 28 · logged Oct 16, 2026 · buying power, filed
Nobody stole your savings. It just quietly bought less every year while you watched the balance stay the same. The cash-drag math on five years of sitting still — and what it costs to do nothing.
The balance lies by staying the same
$10,000 sat in savings from 2020 to September 2026. The statement still says $10,000, plus a whisper of interest. But priced in 2020 dollars, that money is worth about $7,681 — because $10,000 in 2020 converts to $13,019.14 in September 2026 dollars, meaning today's $10,000 buys what $7,681 bought then. Nothing was withdrawn. Nothing was stolen. Nearly a quarter of the buying power evaporated while the balance looked perfectly still.
This is cash drag, and it is the purest form of the inflation tax: no legislation, no vote, no line on your statement. Prices rose 30.2% from 2020 to September 2026; money earning near zero kept none of it. The 2020–2025 stretch alone (24.4% cumulative) took 19.6% off every idle dollar — one minus the 2020 index divided by the 2025 index, the quietest heist in finance.
Same buying power, September 2026 dollars. At 0.4% interest the account holds about $10,232 — a $2,787 real shortfall. Computed from BLS CPI-U.
The emergency fund problem
Emergency funds are the cruelest case, because they are supposed to sit still. A six-month fund of $19,200 — the target from our own emergency-fund worksheet at $3,200 a month in expenses — set in 2020 needs $24,996.03 in September 2026 dollars to cover the same six months. If the fund earned 0.4% and expenses inflated with the average basket, the fund now covers about 4.7 months instead of six. The emergency didn't shrink; the coverage did.
The fix is not to invest the emergency fund in stocks — the money must be there when the furnace dies, regardless of the market. The fix is to re-price the target every year or two and to keep the fund in the highest-yielding safe account you can stand: high-yield savings, money-market funds, short Treasuries. The difference between 0.4% and 4% over five years is about $1,965 on $10,000 — most of the 2020–2025 inflation gap closed for zero additional risk.
What actually kept up
Series I savings bonds exist for exactly this problem: their composite rate combines a fixed rate with the inflation rate, so the buying power is contractually preserved. The trade-offs are real — a one-year lockup, a three-month interest penalty if redeemed before five years, and annual purchase caps — but the concept is the honest one: if you want idle money to stay idle in real terms, you have to buy the inflation protection explicitly. Treasury Inflation-Protected Securities do the same job in marketable form.
None of this is advice — it is arithmetic with a menu attached. The decision is about horizons: money you need within a year should be safe and liquid, full stop; money you need in ten years has no business earning the mattress rate. The mistake is treating all savings as one pile with one job. The emergency fund's job is availability. The long-term pile's job is growth. Inflation punishes whichever pile is doing the other's job.
The annual re-pricing habit
Once a year, run three numbers. First, convert your savings targets to today's dollars — the $19,200 target from 2020 is $24,996.55 now, and pretending otherwise is planning with 2020 prices. Second, check the real yield: nominal rate minus trailing inflation is what you actually earned. Third, move what the horizon allows: safe yield for near-term money, growth assets for the distant pile. Fifteen minutes, once a year, beats five years of watching the balance lie.
Inflation is a tax with no legislation: 2020–2025 quietly took 19.6% off every idle dollar, and the emergency fund that doesn't earn is an emergency fund that shrinks. A $19,200 six-month fund set in 2020 covers about 4.6 months today. Re-price your targets every year — planning with 2020 prices in 2026 is not conservative, it is just wrong.
Sources: U.S. Bureau of Labor Statistics — CPI-U annual averages (2020: 258.811, 2025: 321.943) and the September 2026 index (336.940). Savings conversions computed from the CPI-U table. Series I bonds and TIPS described from U.S. Treasury program mechanics (educational summary, not advice). Emergency-fund target ($19,200 at $3,200/mo expenses) from the site's own emergency-fund calculator.
- How much has inflation eroded savings since 2020?
- $10,000 saved in 2020 needs $13,019.14 in September 2026 dollars to buy the same — a 30.2% price rise. At 0.4% interest the account holds ~$10,232, a $2,787 real shortfall.
- Should I invest my emergency fund to beat inflation?
- No — it must be liquid when emergencies hit. Keep it in the highest-yielding safe account (high-yield savings, money market, short Treasuries) and re-price the target yearly.
- What are Series I bonds?
- U.S. savings bonds whose composite rate combines a fixed rate with inflation, preserving buying power by design. One-year lockup, early-redemption penalty before five years, annual purchase caps.
- What is cash drag?
- The real loss on money earning less than inflation. 2020–2025 took 19.6% off every idle dollar (1 − 258.811 ÷ 321.943) with no withdrawal and no statement line.
- How often should I re-price savings targets?
- Yearly. A $19,200 six-month fund set in 2020 needs $24,996.55 in September 2026 dollars — planning with the old number understates the need by 30%.
Keep reading
- Inflation CalculatorThe buying-power ledger: convert any dollar, 1913 to 2026.
- What Is Inflation, and How Does the CPI Actually Work?Inflation 101 desk.
- Buying Power Through the Decades: What $1 Bought in 1960, 1980, 2000, and NowThe long view desk.
- Did Your Salary Keep Up With Inflation? The Math Nobody Shows YouThe paycheck desk.
- Gas Prices and Inflation in 2026: $4.33 a Gallon and a Third of September’s CPIThe pump desk.