What Will $100,000 Buy in 20 Years?

$100,000 will buy only $55,368 worth of today’s goods

At 3% average annual inflation, $100,000 loses nearly half its purchasing power over 20 years. In two decades, the same $100,000 buys what $55,368 would buy today. Put another way: you would need $180,611 in 20 years to match the buying power of $100,000 today.

How 3% feels small but compounds into something huge

Three percent inflation barely registers year to year. A $4.00 coffee becomes $4.12. A $50,000 car becomes $51,500. The increases feel minor. But compounding works against you with inflation just as powerfully as it works for you with investments.

Here is how $100,000 in purchasing power erodes over time at 3%:

After 5 years: Worth $86,261 in today’s dollars (lost $13,739)
After 10 years: Worth $74,409 (lost $25,591)
After 15 years: Worth $64,186 (lost $35,814)
After 20 years: Worth $55,368 (lost $44,632)
After 30 years: Worth $41,199 (lost $58,801)

The first decade takes away a quarter of your buying power. The second decade takes away another quarter. By year 30, you have lost nearly 60%.

Different inflation rates, dramatically different outcomes

The Federal Reserve targets 2% inflation but the actual rate fluctuates. Here is how $100,000 fares at different rates over 20 years:

Inflation rate	Purchasing power after 20 years	Lost
2%	$67,297	$32,703
3%	$55,368	$44,632
4%	$45,639	$54,361
5%	$37,689	$62,311
7%	$25,842	$74,158

At 5% inflation — which the US experienced in 2022–2023 — $100,000 loses more than 60% of its value in 20 years. At 7%, three-quarters vanishes.

What this means for cash savings

If you leave $100,000 in a checking account earning 0.01% interest for 20 years, inflation eats nearly half the value. Even a high-yield savings account at 4.5% APY only outpaces 3% inflation by 1.5%, growing your real purchasing power slowly.

This is the core argument for investing: stocks have historically returned 7% after inflation, bonds 2–3%, and cash typically keeps pace or falls behind.

Real returns (after 3% inflation) on $100,000 over 20 years:

Cash (0%): $55,368 in purchasing power
Bonds (5% nominal, 2% real): $67,297 → grows to $148,595 nominal, but only worth ~$82,000 in today’s dollars
Stocks (10% nominal, 7% real): $100,000 → grows to $386,968 in today’s dollars

The gap between cash and stocks is over $330,000 in real purchasing power over 20 years. Inflation is the silent tax that makes holding large amounts of cash expensive over long periods.

Practical implications

Retirement planning: If you retire at 65 and need $50,000/year in today’s dollars, you will need $90,306/year in nominal dollars by age 85 (at 3% inflation). Your income sources must grow or your spending must shrink.
Salary negotiation: A 3% annual raise is not a raise — it is keeping pace with inflation. You need above-inflation raises to actually improve your standard of living.
Fixed-rate debt: Inflation benefits borrowers. A 30-year mortgage with fixed payments gets cheaper in real terms every year. This is one reason homeownership is seen as an inflation hedge.

Use the Inflation Calculator to see how inflation affects any amount over any time period.