How can I protect my savings from losing purchasing power?

Long-run holdings need returns above inflation after taxes. Equities, real estate, and TIPS have historically helped; cash earns little real return when CPI runs near 3.7%. Even high-yield savings near 4.5% APY only slightly beats 3% inflation before taxes.

What is the difference between real and nominal returns?

Nominal returns are quoted before inflation; real returns subtract inflation. A 7% portfolio return with 3% inflation is about 4% real. Wealth goals should be stated in real (today's) dollars when possible.

How is inflation measured, and does the official rate reflect my experience?

BLS publishes CPI-U (all urban consumers) monthly. September 2026 CPI-U was 336.940 (1982–84=100), up 3.7% year over year. Households heavy on rent, tuition, or medical care may feel higher personal inflation than the headline index.

Inflation scenario

What Will $100 Be Worth in the Future?

See how $100 loses purchasing power over 10, 20, and 30 years. Compare 3% planning rates to the 3.7% September 2026 CPI pace.

Cash loses buying power every year inflation runs above zero. At 3% — a common long-run planning assumption — $100 today buys what $55.37 buys in 20 years. The September 2026 CPI-U rose 3.7% over the prior 12 months, faster than the Federal Reserve's 2% PCE target, which is why savers compare both rates when setting emergency fund and investment goals.

Current Amount

Annual Inflation Rate

Time Period

years

Default 3.7% matches the U.S. CPI-U 12-month change for September 2026 (BLS release October 14, 2026). The Federal Reserve targets 2% PCE inflation over the longer run — use a lower rate for conservative planning scenarios.

Future Price

$180.61

What $100.00 will cost

Purchasing Power

$55.37

What $100.00 will be worth

Total Inflation

80.6%

Cumulative price increase

Purchasing Power Loss

44.6%

Prices double in ~24 years

Inflation Impact Over Time

Year	Future Price	Purchasing Power	Cumulative Inflation
2	$106.09	$94.26	6.1%
4	$112.55	$88.85	12.6%
6	$119.41	$83.75	19.4%
8	$126.68	$78.94	26.7%
10	$134.39	$74.41	34.4%
12	$142.58	$70.14	42.6%
14	$151.26	$66.11	51.3%
16	$160.47	$62.32	60.5%
18	$170.24	$58.74	70.2%
20	$180.61	$55.37	80.6%

Key Considerations

At 3% inflation, $100 retains $74.41 of purchasing power in 10 years, $55.37 in 20 years, and $41.20 in 30 years.
To buy what $100 buys today, you will need $134.39 in 10 years, $180.61 in 20 years, and $242.73 in 30 years at 3%.
$10,000 in a zero-interest account for 20 years at 3% inflation loses about $4,463 in purchasing power silently.
A 4.5% APY savings account turns $100 into $124.12 in five years, but at 3% inflation you need $115.93 to break even — about $8 real gain before taxes.
At 3.7% (September 2026 CPI-U 12-month change), $100 retains about $69.50 of power in 10 years and $48.30 in 20 years — faster erosion than a 3% plan assumes.

Quick Numbers

Value of $100 today	$100.00
Purchasing power in 10 years at 3%	$74.41
Purchasing power in 20 years at 3%	$55.37
Purchasing power in 30 years at 3%	$41.20
Future cost in 20 years at 3%	$180.61
Purchasing power in 20 years at 3.7%	$48.30

How This Compares

At 2% inflation, $100 retains $82.03 after 10 years; at 3%, $74.41; at 3.7%, about $69.50. A 1.7-point spread between 2% and 3.7% erases an extra $12.53 of purchasing power per $100 over a decade — tens of thousands across a full portfolio.

Frequently Asked Questions

How can I protect my savings from losing purchasing power?: Long-run holdings need returns above inflation after taxes. Equities, real estate, and TIPS have historically helped; cash earns little real return when CPI runs near 3.7%. Even high-yield savings near 4.5% APY only slightly beats 3% inflation before taxes.
What is the difference between real and nominal returns?: Nominal returns are quoted before inflation; real returns subtract inflation. A 7% portfolio return with 3% inflation is about 4% real. Wealth goals should be stated in real (today's) dollars when possible.
How is inflation measured, and does the official rate reflect my experience?: BLS publishes CPI-U (all urban consumers) monthly. September 2026 CPI-U was 336.940 (1982–84=100), up 3.7% year over year. Households heavy on rent, tuition, or medical care may feel higher personal inflation than the headline index.

Sources BLS Consumer Price Index — September 2026 (released Oct. 14, 2026), Federal Reserve — 2% longer-run PCE inflation objective (reaffirmed Jan. 27, 2026). Checked October 2026.