WorthCalc

2026-08-29

APR vs. APY: Why Borrowing Rates and Savings Yields Are Not the Same Number

Direct answer: APR, or annual percentage rate, is a standardized borrowing-cost measure. APY, or annual percentage yield, is a deposit-return measure that reflects the interest rate and compounding over a year. Both are shown as percentages, but they describe opposite cash-flow directions and are governed by different disclosure frameworks. Do not compare a 5% APR loan with a 5% APY savings account as if the two rates were interchangeable.

Start with the plain interest rate

An interest rate is the basic price of borrowing or the stated rate paid on a deposit. It may not include loan fees, and on a deposit it does not necessarily show the effect of compounding frequency.

That is why U.S. consumer rules use additional standardized terms for comparison.

APR is for the cost of credit

The CFPB describes APR as a broader measure of loan cost than the interest rate because it can reflect the interest rate plus certain fees charged to obtain the credit. Under Regulation Z, APR is expressed as a yearly rate so consumers can compare credit costs on a more standardized basis.

A loan advertised at 6% interest could have an APR above 6% if required origination charges or other included finance charges increase the effective cost.

APR still does not tell you everything. Two loans can have similar APRs but different terms, monthly payments, total finance charges, prepayment rules, or variable-rate risk.

APY is for deposit yield

Regulation DD defines annual percentage yield as a percentage rate reflecting the total amount of interest paid on an account based on the interest rate and compounding frequency over a 365-day period.

For a simple fixed-rate example, if a bank states a 5% nominal annual interest rate and compounds monthly, the APY will be slightly above 5% because each period’s credited interest can itself earn interest.

A simplified educational formula is:

APY = (1 + r/n)^n − 1

where r is the nominal annual rate and n is the number of compounding periods. A bank’s disclosed APY should be taken from its official account disclosure rather than replaced with your own simplified calculation.

Why APR and APY can move in opposite directions

For a saver, more frequent compounding can increase annual yield when all else is equal. For a borrower, fees and compounding can increase cost. The labels exist partly to prevent a plain rate from hiding these effects.

That makes this comparison useful:

QuestionPrimary standardized rateWhat else to check
What does this loan cost?APRterm, payment, finance charge, variable rate, prepayment
What does this deposit yield?APYfees, minimum balance, rate tiers, withdrawal restrictions, promo period

A worked borrowing example

Loan A: $10,000 principal, 8% stated interest, no origination fee.

Loan B: $10,000 principal, 7.5% stated interest, but a required upfront fee is included in the credit cost.

Loan B can have a higher APR despite the lower headline interest rate. The exact result depends on amount, timing, term, and which charges are included. This is why comparing “7.5% vs 8%” without the official APR can be misleading.

A worked deposit example

Account A: 4.90% interest rate, monthly compounding.

Account B: 5.00% APY.

You cannot conclude Account A is better by comparing 4.90% interest with 5.00% APY. Put the two accounts on the same basis using their disclosed APYs, then inspect fees, balance requirements, and whether the rate is promotional.

Why a short-term fee can look small but imply a large annualized cost

A 3% fee on a six-month installment is not the same as a 3% APR. Time matters. WorthCalc’s existing Installment True APR Calculator converts fees and payment timing into a comparable annualized borrowing cost, which is exactly the kind of problem APR is designed to illuminate.

APY is not a guarantee that the account will pay that rate forever

A variable-rate savings account may change its rate. A promotional account may have balance tiers, introductory periods, or eligibility conditions. Regulation DD requires disclosures around APY, rates, minimum-balance rules, and fees, but you still need to read the current account terms.

APR is not total dollars paid

APR is a standardized rate, not the same thing as finance charge or total of payments. A longer term can create a lower monthly payment while increasing total interest even if APR stays identical. For auto and other installment loans, compare APR and the full payment schedule.

FAQ

Is APR always higher than the interest rate?

Not in every imaginable product structure, but for many consumer loans with included fees it is higher. Use the official disclosure rather than assuming a fixed relationship.

Is APY always higher than the interest rate?

When positive interest compounds more than once a year and all else is simple, APY is typically above the nominal rate. Account rules can be more complex, so use the disclosed APY.

Can I subtract savings APY from loan APR to decide whether to borrow?

That shortcut ignores taxes, liquidity, risk, fees, term, and the fact that borrowing and saving cash flows have different purposes. It is not a complete decision rule.

Why does my mortgage APR differ from my note rate?

The CFPB explains that mortgage APR can reflect the interest rate plus points, broker fees, and other charges used to obtain the loan.

Which rate should I use in a savings projection?

Use the rate definition that matches the account and modeling purpose. For a deposit account, APY is the better standardized one-year yield measure; for market investments, a deposit APY concept does not apply.

Sources and limitations

This page relies on U.S. CFPB Regulation Z and Regulation DD terminology. Other countries may use different definitions and disclosures. It is educational and does not recommend a specific deposit or loan.

APR and APY are standardized for different regulatory jobs

APR exists to make credit cost more comparable. APY exists to make deposit yield more comparable. In the U.S., Regulation Z addresses consumer credit disclosures while Regulation DD addresses deposit-account disclosures. These are not interchangeable marketing acronyms.

A numerical APY example

With a 5.00% nominal annual deposit rate compounded monthly, the simplified annualized yield is:

(1 + 0.05/12)^12 − 1 ≈ 5.116%

That is why a nominal rate and APY can differ even when no promotional bonus exists. Real deposit accounts can include tiers, variable rates, required balances, or other conditions, so use the bank’s official APY disclosure for comparison.

Opening bonuses should not be confused with ongoing yield

A $300 opening bonus can make the first year of an account look unusually attractive, but it is not the same thing as a permanent APY. Compare the bonus separately from ongoing yield and check holding periods, direct-deposit requirements, minimum balances, and any fee that can erase part of the benefit.

Promotional APR needs an exit scenario

A 0% promotional credit-card APR is incomplete information without the promotional period, transfer fee, standard APR afterward, and projected balance when the promotion ends. WorthCalc’s payoff tool can model a promotional rate followed by a standard rate so the “after” case is not hidden.

A borrowing comparison checklist

Before choosing between loans, record:

A deposit comparison checklist

Before choosing a deposit account, record:

The best standardized percentage is still only one line of the contract.

Sources

WorthCalc provides general educational estimates and frameworks. This page is not individualized financial, investment, tax, legal, credit, or lending advice. Verify current account terms, contracts, rates, fees, and local rules before acting.

How this is calculated

Method

This page applies the visible inputs to the calculation shown on the page.

Sources

This page uses only arithmetic and the values you enter. It cites no outside figures.

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