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Inflation doesn't take dollars out of your account. It makes each dollar buy less. If you keep $20,000 in cash earning nothing and prices rise 3% a year, after 10 years your $20,000 will buy roughly what $14,882 buys today. You will have lost about a quarter of your buying power without spending a cent.
To keep pace, your savings need to earn at least the inflation rate, and more than that once tax is taken into account. The good news is that the math is simple, and a few choices about where you keep your money make a large difference.
What inflation does to $20,000 in cash
Here is the buying power of $20,000 that earns no interest, in today's dollars, at four illustrative inflation rates compounded yearly:
| Inflation rate | After 5 years | After 10 years | After 20 years |
|---|---|---|---|
| 2% | $18,115 | $16,407 | $13,459 |
| 3% | $17,252 | $14,882 | $11,074 |
| 4% | $16,439 | $13,511 | $9,128 |
| 6% | $14,945 | $11,168 | $6,236 |
At 3% inflation, cash loses 25.6% of its buying power in 10 years. At 6%, more than two-thirds of it is gone in 20 years. You can run any amount, rate and time span through the inflation calculator.
The two formulas you need
The first tells you what a future amount is worth in today's money:
The second tells you your real return, which is what your money earns after inflation:
A quick shortcut is nominal return minus inflation. A savings account paying 4% with 3% inflation has a real return of about 1%. The exact figure is 0.97%. The shortcut gets less accurate as rates rise, so use the full formula for anything above a few percent.
Worked example: the same $20,000 in five places
Suppose inflation runs at a steady 3% for 10 years and you leave $20,000 untouched. Here is how it ends up at five illustrative rates of return, compounded yearly:
| Where it sits | Return | Balance after 10 years | In today's dollars | Real return |
|---|---|---|---|---|
| Checking account | 0.5% | $21,023 | $15,643 | −2.43% |
| Low-rate savings | 1.0% | $22,092 | $16,439 | −1.94% |
| Matches inflation | 3.0% | $26,878 | $20,000 | 0.00% |
| High-yield savings | 4.5% | $31,059 | $23,111 | 1.46% |
| Long-term investments | 7.0% | $39,343 | $29,275 | 3.88% |
The low-rate account looks like it grew by $2,092. In reality, it lost buying power worth more than $3,500. Only the accounts earning more than 3% actually made you richer.
The 7% row is not a promise. Investments with higher expected returns can lose value, sometimes sharply, and the rate in any given year may be far from the average. Savings account rates are variable too.
Key idea Your balance going up is not the same as your wealth going up. Judge every account by its real return: the rate it pays minus the rate prices are rising.
Don't forget tax
In many countries, interest on ordinary savings is taxed as income. That widens the gap between what you earn and what you keep.
Take a 4% savings rate with an illustrative 20% tax on the interest:
- After tax, you keep 4% × 0.80 = 3.20%.
- With 3% inflation, your real return is (1.032 ÷ 1.03) − 1 = 0.19%.
At 4.5%, the after-tax rate is 3.60% and the real return is 0.58%. A savings account can look comfortably ahead of inflation and still barely move your buying power once tax comes out. Tax-advantaged savings accounts, where your country offers them, help close that gap. Check the current rules and limits with your tax authority.
How fast prices double
The Rule of 72 gives a quick estimate of how long it takes prices to double: divide 72 by the inflation rate.
- At 3% inflation, about 24 years (the exact figure is 23.45 years).
- At 4%, about 18 years (exactly 17.67).
Put another way, a basket of goods that costs $100 today would cost $180.61 in 20 years at 3% inflation. Our guide to what $100 will be worth shows the same idea in reverse.
Plan your goals in future dollars
Inflation also changes how much you need to save. If a goal is years away, price it in the dollars you'll be spending, not today's dollars.
| Goal | Cost today | Years away | Cost at 3% inflation |
|---|---|---|---|
| Replacement car | $35,000 | 6 | $41,792 |
| A year of living costs | $50,000 | 25 | $104,689 |
If you save for the car based on today's $35,000 price, you'll come up about $6,800 short. Once you have the future figure, use the savings goal calculator to work out the monthly amount, and the compound interest calculator to test how different returns change it.
Your personal inflation rate
Official inflation figures, such as the consumer price index published by the Bureau of Labor Statistics in the US, the Office for National Statistics in the UK, Statistics Canada and the Australian Bureau of Statistics, track the average household's spending. Yours may differ. If rent, childcare, insurance or fuel make up a big share of your budget and those prices are rising faster than average, your own inflation rate is higher than the headline number. Plan with a slightly higher rate than the official one if that describes you.
What you can do about it
Short-term and emergency money: keep it safe, but make it earn
Money you might need within a year or two, including your emergency fund, still belongs in safe, easy-to-reach accounts. Losing some buying power is the price of having cash on hand. But the rate still matters.
Take a $15,000 emergency fund held for five years with 3% inflation:
| Account rate | Balance after 5 years | In today's dollars |
|---|---|---|
| 0.5% | $15,379 | $13,266 |
| 4.5% | $18,693 | $16,125 |
Same safety, same access, but the higher-rate account preserves $2,859 more buying power. See high-yield savings vs CD for where to keep it and how big your emergency fund should be for how much to hold.
Money needed in two to five years
Fixed-rate CDs and short-term government bonds can lock in a rate. Some governments also sell inflation-linked bonds whose value rises with the price index, such as Treasury Inflation-Protected Securities (TIPS) and I bonds in the US, or index-linked gilts in the UK. Their terms and purchase rules change, so check the current details from the official issuer.
Long-term money
For goals ten or more years away, holding everything in cash makes it hard to stay ahead of inflation after tax. Investments with higher expected returns, such as a diversified mix of stocks and bonds, have more potential to outpace inflation over long periods. They also come with real risk of loss along the way, and nothing guarantees they will beat inflation over any particular span.
Frequently asked questions
Is it better to spend money now before it loses value?
Not as a rule. Inflation is a reason to put savings where they earn a real return, not a reason to spend them. Buying something early only makes sense if you were going to buy it anyway and its price is likely to rise.
Does inflation help people with debt?
It can, in real terms. With a fixed-rate loan, your payment stays the same while prices and, ideally, wages rise, so each payment costs you less buying power over time. That doesn't apply to variable-rate debt, whose rate may rise with inflation.
What inflation rate should I use for planning?
One approach is to plan with a moderate figure, such as 2.5% or 3%, and then rerun the numbers at a higher rate to see how sensitive the plan is. Check recent official figures for your country and adjust for your own spending.
Are my savings protected from inflation by deposit insurance?
No. Deposit insurance protects the dollar amount of eligible deposits if a bank fails. It does nothing about the buying power of those dollars.
A quick checklist
- Write down the rate each of your savings accounts pays, and subtract inflation to find the real return.
- Move cash sitting at a near-zero rate to a better account with the same safety and access.
- Keep only short-term and emergency money in cash; give long-term money a chance to grow.
- Price future goals in future dollars using the inflation calculator.
- Revisit the plan once a year, because both inflation and savings rates change.
This article is for general education and is not financial advice. Rules, rates and products vary by lender and country. See our disclaimer.
