APR reflects the yearly cost of borrowing money, including interest and most fees, while APY reflects the yearly return on money you deposit or invest, including the effect of compounding. Confusing the two can lead you to underestimate what a loan actually costs or overestimate what a savings account actually earns, since APY looks larger than a comparable APR for the same nominal rate due to compounding.
APR and APY sound like the same acronym rearranged, and that similarity causes more financial confusion than almost any other pair of terms in personal finance. They are not interchangeable, and mixing them up when comparing a loan offer to a savings account can lead to a genuinely costly misunderstanding.
Selon les Bureau de protection financière des consommateurs, lenders are required to disclose APR under the Truth in Lending Act specifically so borrowers can compare the true cost of credit across different offers on an apples-to-apples basis. The FDIC similarly requires banks to disclose APY on deposit accounts so savers can compare the actual annual return across institutions.
What Is the Real Difference Between APR and APY?
APR, or annual percentage rate, measures the cost of borrowing over a year, including interest and certain fees, without accounting for compounding. APY, or annual percentage yield, measures the return on money deposited or invested over a year, and does account for compounding, meaning it reflects interest earning interest throughout the year.
The compounding difference is the key technical distinction. A savings account advertising a 5% interest rate compounded monthly will show an APY slightly above 5%, since each month’s interest starts earning its own interest for the rest of the year.
From experience: A small business owner compared two business loan offers, one advertised at 6% APR and another advertised at what the salesperson called a “6% rate” without clarifying it was actually an APY figure being used loosely, a common and misleading sales tactic. Once we confirmed the second offer’s actual APR, factoring in origination fees the first offer didn’t include, the second loan was meaningfully more expensive than it initially appeared, despite sounding identical to the first on the surface.
APR vs APY Comparison
| Aspect | APR | APY |
|---|---|---|
| Used for | Loans, credit cards, mortgages | Savings accounts, CDs |
| Includes compounding | Non | Oui |
| What it represents | Cost to you | Return to you |
| Legal disclosure requirement | Truth in Lending Act | Truth in Savings Act |
Point clé à retenir : When comparing loans, always compare APR to APR. When comparing savings or investment accounts, always compare APY to APY. Comparing an APR figure to an APY figure directly will give you a distorted picture in either direction.
How to Use APR and APY Correctly When Comparing Offers
- For loans and credit cards, compare the APR figure across offers, since it includes most fees and gives the most complete cost picture.
- For savings accounts and CDs, compare the APY figure, since it reflects your actual annual return including compounding.
- Watch for compounding frequency differences between similar APY offers, since daily compounding produces a slightly higher effective return than monthly or annual compounding at the same nominal rate.
- Read the fine print on APR to confirm which fees are actually included, since not all lender fees are required to be reflected in the disclosed APR.
From experience: A first-time saver was comparing two high-yield savings accounts, one advertising a slightly higher nominal interest rate but compounding annually and another advertising a slightly lower nominal rate but compounding daily. Running the actual APY calculation for both, the daily-compounding account with the “lower” advertised rate produced a marginally higher effective annual yield, a distinction she would have missed entirely by comparing the advertised nominal rates instead of the actual APY figures.
Common Mistakes When Comparing APR and APY
- Comparing a loan’s APR directly to a savings account’s APY, which compares two fundamentally different calculations and produces a misleading picture.
- Assuming all fees are baked into every disclosed APR, when some fee types are excluded depending on loan type and jurisdiction.
- Ignoring compounding frequency when comparing two APY figures that sound similar on the surface.
Foire aux questions
Q: Why is APY always higher than the nominal interest rate?
A: APY accounts for compounding, meaning interest earned during the year itself starts earning additional interest, which makes the effective annual yield higher than the simple nominal rate before compounding is factored in.
Q: Does a lower APR always mean a cheaper loan?
A: Generally yes, since APR is designed to reflect the total annual cost including most fees, though it is still worth confirming which specific fees are included, as disclosure requirements can vary by loan type.
Q: Can APR and APY be the same number?
A: Yes, if interest compounds only once per year, APR and APY converge to the same figure, since there is no additional compounding effect within the year to create a difference between the two.
Q: Is APY only used for savings accounts?
A: APY is most commonly associated with savings accounts and certificates of deposit, though the underlying compounding concept applies to any interest-bearing account where interest is calculated more frequently than once annually.
Q: How can I calculate my own APY from a nominal interest rate?
A: The calculation depends on the compounding frequency and involves raising the periodic rate to the number of compounding periods in a year, which is why using a dedicated calculator is generally more reliable than manual estimation.
Compare Your Own Interest Scenarios
Le gratuit Compound Interest Calculator at ToolsTecique helps you see the actual APY impact of different compounding frequencies on your savings. No sign-up required, just enter your numbers and see the result instantly. For loan comparisons, our Calculateur d'amortissement de prêt shows the true cost breakdown behind any advertised APR.
