Savings
How does inflation affect savings and CDs?
Calculate the real return on savings, compare APY with inflation, and understand how tax and withdrawal terms change the result.
Balance growth and buying-power growth
Suppose $10,000 earns 4% over a year and prices rise 5%. The balance becomes $10,400, but its value in starting-year dollars is $10,400 ÷ 1.05 = $9,904.76. The real loss is about $95.24 before tax. This is a hypothetical scenario, not a current deposit offer.
Compare APY over the same horizon
For a one-year comparison, real return = (1 + APY) ÷ (1 + inflation) − 1. APY already reflects compounding under the product’s terms. Do not add compounding a second time. The St. Louis Fed’s real-interest-rate explainer distinguishes nominal interest from inflation-adjusted interest.
Tax can change the break-even point
If the $400 interest in the example is reduced by an illustrative 25% tax, the remaining interest is $300. The $10,300 balance is worth about $9,809.52 in starting-year dollars. Actual tax treatment depends on the account and your circumstances. The CD calculator lets you change the assumed rates and tax inputs.
Inflation protection and access are separate questions
Cash may still serve a useful purpose for near-term bills and emergencies even when its real return is negative. A higher advertised yield can involve lockups, variable rates, or withdrawal penalties. Compare when you need the money, the product terms, and purchasing power together. Read TIPS versus I bonds to understand two different forms of inflation-linked government securities.
Does a high-yield savings account always beat inflation?
No. Its rate can change, inflation can change, and tax may reduce the return. Compare actual returns and prices over the same period rather than relying on the product name.