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APY vs. Interest Rate: Reading a Savings Offer

By · Updated · 3 min read

APY, or annual percentage yield, expresses a deposit account’s annual yield with compounding included. The stated interest rate describes the rate used to calculate interest before that compounding effect. APY helps compare offers, but fees, balance requirements, and rate changes still matter.

See what compounding adds to the quoted rate

If interest stays in an account, later interest can be calculated on a larger balance. APY captures that effect under the account’s disclosed assumptions. It does not mean an additional bonus is paid on top of the stated interest rate.

For a simplified example, a 4% annual interest rate compounded monthly has an APY of about 4.07%. The formula is (1 + 0.04 ÷ 12) raised to the twelfth power, minus 1. These figures are illustrations, not available account offers.

Sources: CFPB: Annual percentage yield calculation

Turn the comparison into money

If a hypothetical account maintains a 4% APY for a full year, a $5,000 opening deposit becomes $5,200 when there are no additions, withdrawals, or fees and earnings remain in the account.

Another hypothetical account at 4.25% APY would earn $212.50 under the same conditions. The difference is $12.50 for the year. Whether that difference matters to you depends on the account’s costs and access, not just which number is larger.

Turn the comparison into money: comparison
Illustrative offerAnnual interest on $5,000Annual service feesInterest minus fees
4% APY; no monthly fee$200$0$200
4.25% APY; $3 monthly fee$212.50$36$176.50

Read the conditions attached to the number

Check whether the rate is variable, whether a promotional rate expires, and which balance qualifies. Some accounts use tiers or require particular activity. An advertised yield may not apply to every dollar or every account holder.

Imagine an offer paying a higher yield only on the first $1,000. It cannot be compared with a flat-rate account by applying the headline number to a $10,000 balance. Ask for the actual yield and fees at the balance you expect to keep.

Sources: CFPB: Deposit-account disclosures

Make one consistent comparison

Use the same deposit amount and time horizon for each offer. Record access time and withdrawal conditions alongside the yield. Money needed next month has a different job from money you can leave untouched for a year.

Revisit variable-rate accounts when the terms change. The comparison is a snapshot of the disclosed offer, not a guarantee that the account will remain the highest-paying option.

  1. Record APY and whether it is fixed or variable.
  2. Check balance tiers and eligibility conditions.
  3. Estimate fees using your expected account activity.
  4. Confirm access, institution, and applicable deposit insurance.

Sources: CFPB: Deposit-account disclosures

Calculators for this guide

Try it with your own numbersCompound Interest CalculatorFree compound interest calculator. See how a starting amount and monthly contributions could grow over time, and how much of the balance is growth.Try it with your own numbersSavings Goal CalculatorFree savings goal calculator. See how much to set aside each month, every two weeks or each week to reach a goal on time, with or without interest.Try it with your own numbersAPY CalculatorFree APY calculator. Convert an interest rate and compounding frequency into annual percentage yield, and see the interest a deposit could earn.

Terms in this guide

Sources and further reading

Examples are illustrative and focus on U.S. personal finance. This guide is educational, not individual financial, investment, tax, or legal advice. Read our editorial approach or report a correction.

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