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Why is APY always higher than APR?

Financial Toolset Team5 min read

APY is higher than APR because it accounts for compound interest - earning interest on interest. Each time interest compounds (monthly, daily, etc.), that interest is added to your principal and be...

Why is APY always higher than APR?

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Why is APY Always Higher Than APR?

Understanding financial terminology can sometimes feel like learning a new language. Among the most common terms you’ll encounter are APY (Annual Percentage Yield) and APR (Annual Percentage Rate). These terms, while related, serve different purposes and are calculated differently. Today, we'll explore why APY is always higher than APR and why this distinction matters when assessing financial products.

Understanding the Basics: APY vs. APR

To grasp why APY is always higher than APR, we first need to understand what each term represents:

How Compounding Affects APY

The key difference between APY and APR lies in compounding. Compounding refers to the process where the interest earned itself earns interest over time. Here’s how it works:

  • Compounding Frequency: The more frequently interest is compounded (daily, monthly, quarterly), the higher the APY will be compared to the APR. For instance, with daily compounding, the interest earned each day is added to the principal, and the next day's interest calculation includes this new amount.

  • Mathematical Formula: The formula for calculating APY is ( \text{APY} = \left(1 + \frac{R}{N}\right)^N - 1 ), where ( R ) is the nominal interest rate and ( N ) is the number of compounding periods per year. This formula showcases how compounding can significantly boost the effective annual interest rate.

Real-World Examples

Example 1: Savings Accounts

Imagine you deposit $1,000 into a savings account with a 6% APR that compounds daily. The APY in this case would be approximately 6.18%. Here’s why:

  • Daily Compounding Impact: Each day, the interest calculation includes the previous day’s interest, effectively increasing the principal slightly every day. Over the course of a year, this results in a higher return than the simple APR calculation suggests.

Example 2: Credit Cards

Suppose a credit card has a 12% APR and charges interest monthly. The APY, accounting for monthly compounding, would be about 12.68%. If you only looked at the APR, you might underestimate the cost of carrying a balance on this card, as the compounding effect increases your actual interest cost.

Common Mistakes and Considerations

When comparing financial products, it's important to understand which metric to use:

  • Use APR for Loans: When evaluating loans or credit cards, focus on APR to understand the cost of borrowing. APR includes interest and some fees, giving a more holistic view of loan costs.

  • Use APY for Savings: For savings accounts or investments, APY provides a clearer picture of potential earnings, as it includes the effect of compounding.

Important Considerations

  • Fees in APR: While APR can include fees, it still doesn’t account for compounding. Always verify whether the APR includes all relevant fees and charges.

  • Interest Reinvestment in APY: APY assumes that interest is reinvested. If you withdraw interest regularly, your effective return could be lower than the stated APY.

Bottom Line

In essence, APY is always higher than APR because it factors in the magic of compound interest—a key component that APR ignores. This makes APY a more accurate reflection of the true return on savings and investments. Whether you’re saving or borrowing, understanding these differences can help you make more informed financial decisions. Remember, when comparing financial products, always match the correct metric to the financial product: APR for loans and credits, and APY for savings and investments. By doing so, you ensure you’re making the best choice for your financial future.

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