Inflation is often called a 'silent tax' on savings. If your savings account pays 2% interest but inflation is running at 4%, your money is losing purchasing power at 2% per year — even as the nominal balance grows.
The real interest rate
Real interest rate = nominal rate − inflation rate. If your HYSA pays 4.5% and inflation is 3.2%, your real return is 1.3%. That means your money grows in real terms — but only marginally. In years where inflation exceeds savings rates, you lose ground even with the interest.
What inflation does to a lump sum over time
At 3% average inflation: $100,000 today has the purchasing power of:
$74,000 in 10 years
$55,000 in 20 years
$41,000 in 30 years
A $100,000 sum left in a zero-interest account for 30 years effectively shrinks to $41,000 in real terms — a 59% loss without losing a single dollar in nominal terms.
Why cash in a savings account is not 'safe'
Cash feels safe because the number doesn't go down. But 'safe' in finance should mean safe purchasing power, not safe nominal value. Over long time horizons, holding large amounts in cash accounts is one of the most reliably wealth-eroding strategies available.
What to hold instead
- Short-to-medium term (0–5 years): High-yield savings, I-bonds, short-term bonds
- Medium term (5–10 years): Diversified bond funds, balanced index funds
- Long term (10+ years): Equity index funds, REITs, real assets — historically the strongest inflation hedge
Frequently Asked Questions
How do I calculate the real return on my savings account?
Real interest rate = nominal savings rate − inflation rate. If your high-yield savings account pays 4.5% and CPI inflation is running at 3.2%, your real return is 1.3%. In periods of high inflation, even a nominally competitive savings rate can produce a negative real return — meaning your purchasing power is shrinking even as your account balance grows.
Are I-bonds or TIPS good inflation hedges?
Yes — both are specifically designed to protect purchasing power. I-bonds (US savings bonds) pay a composite rate that adjusts with CPI every six months; they have a $10,000/year purchase limit per person and a one-year lock-up period. TIPS (Treasury Inflation-Protected Securities) have no purchase cap and are tradable, but their market value fluctuates if sold before maturity. Both are appropriate for a portion of a conservative savings or investment portfolio.
Should I keep any cash savings despite inflation?
Yes — cash serves a specific and irreplaceable role as an emergency fund and short-term reserve. The goal is to minimise long-term holdings in low-yield accounts beyond that buffer. Three to six months of living expenses in a high-yield savings account is appropriate and sensible. Holding 5–10 years of savings in cash or a basic checking account, however, is where inflation silently destroys purchasing power over time.
See the real impact of inflation on your money
Use our Inflation Calculator to see what a specific amount of money will be worth in future years at different inflation rates.