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What is the Difference Between Interest Rate and APR on a Loan?

When taking out a loan, whether it's a mortgage, auto loan, personal loan, or credit card, two of the most critical numbers to understand are the interest rate and the Annual Percentage Rate (APR). While these rates are closely related, they represent distinct measures of the cost of borrowing money. Failing to grasp the nuances between them can lead to confusion and potentially costly errors when evaluating loan options.

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Interest Rate

 

The interest rate is the periodic cost of borrowing the principal loan amount, expressed as an annual percentage rate. Lenders apply this rate to calculate the interest charges on top of the original loan amount that borrowers must repay over the loan term, typically in monthly installments. See: Guide To Personal Loan Interest Rates


For example, if you take out a $10,000 personal loan at an 8% interest rate, you would pay $800 per year in interest charges (8% of $10,000). Over a 3-year repayment period, the total interest paid on the loan principal would be $2,400 ($800 x 3 years). This interest is the cost you pay to the lender for the ability to borrow that money.

Interest rates can come in different varieties that affect how they are applied:


Fixed Interest Rates

 

This is an interest rate that remains constant for the entire duration of the loan. The rate is "fixed" at origination, providing consistency and predictability in interest costs over time. Common examples are fixed-rate mortgages, auto loans, and private student loans.


Variable/Floating Interest Rates


Some loans use variable or floating interest rates that can fluctuate over time based on changes in market interest rates or other economic indices. Adjustable-rate mortgages (ARMs), credit cards, and some private student loans use variable rates that move up or down periodically.


APR (Annual Percentage Rate)

 

While the interest rate specifically reflects the cost of borrowing the principal itself, the Annual Percentage Rate is a broader measure that aims to capture the total annual borrowing cost of a loan. The APR calculation folds in most upfront fees in addition to the recurring interest charges.


The specific fees included in an APR calculation can vary across different loan products, but common examples are:

  • Origination/Underwriting fees
  • Discount points (mortgage loans)
  • Broker fees
  • Mortgage insurance premiums
  • Certain closing costs like appraisals, attorney's fees, title searches etc.

By accounting for these upfront fees over the duration of the loan, the APR represents the total cost of borrowing money more accurately compared to just looking at the interest rate alone.


It provides an apples-to-apples pricing comparison across different loan options.


To illustrate with an example:

  • You take out a $200,000, 30-year mortgage with a 4% interest rate
  • But the lender also charges $5,000 in upfront origination/underwriting fees
  • The APR that captures both the interest rate and fees would be around 4.2%
  • So while the interest rate is 4%, the APR of 4.2% provides a higher annualized borrowing cost that incorporates the $5,000 fee paid upfront.

The Differences Summarized

 

To summarize the key differences between interest rate and APR:

  • Interest rate is the annual cost of borrowing the principal loan amount
  • APR is a broader, more comprehensive calculation of the annualized borrowing cost that folds in most loan fees in addition to interest charges

As a result of including fees, APRs are always equal to or higher than the stated interest rate on a loan. Larger upfront fees lead to a wider spread between the interest rate and APR.


The APR provides a more realistic and inclusive view of the total costs of borrowing money for that loan product. Interest rate is a good starting point, but the APR gives an apples-to-apples cost comparison that accounts for fees across multiple loan options.


Why Both Numbers Matter

 

As a borrower evaluating your financing options, it's crucial to pay close attention to both the interest rate and APR quoted by lenders. A lower interest rate will reduce your recurring interest costs - but high upfront fees can potentially negate those interest savings when considering the overall APR.


Looking only at the APR also has limitations since the specific calculation may not reflect certain backend costs like:

  • Late payment fees
  • Prepayment penalties
  • Document processing fees
  • Ongoing annual fees

When shopping around, be sure to read the fine print and ask clarifying questions about all potential fees to your lender. Understand both the interest rate and APR, as well as what's included (and just as importantly, what's excluded) from the APR calculation. This due diligence will help you choose the most cost-effective loan product and avoid unpleasant surprises regarding the true total cost.


It's also important to note that for open-ended loans like credit cards and lines of credit, the APR you see advertised may not be the actual APR you end up qualifying for based on your creditworthiness. Many issuers provide a range of potential APRs rather than a single rate.


Comparing the APRs on Loans

 

To illustrate the importance of APR when evaluating loan costs, let's look at a example comparing two different auto loan options for a $25,000 car loan:


Loan 1: Interest Rate of 5%, $500 upfront fees

Loan 2: Interest Rate of 5.5%, $0 upfront fees


At first glance, the 5% interest rate on Loan 1 appears cheaper than the 5.5% rate on Loan 2. However, the APRs tell a different story:


Loan 1: APR = 5.35%

Loan 2: APR = 5.5%


Even though the interest rate is lower on Loan 1, the APR shows that the $500 upfront fees actually make this the more expensive borrowing option compared to Loan 2 which has no fees.


This example underscores why APR is the superior metric for making an apples-to-apples cost comparison between loan products. Using APRs puts all the cards on the table for the total costs of borrowing rather than just looking at interest rates in isolation.


The Takeaway

 

When evaluating a loan's affordability and shopping around for the most cost-effective option, borrowers must understand the distinction between the interest rate and APR. Both numbers are important considerations that provide different pieces of the overall pricing puzzle.


The interest rate is the straightforward annual cost of borrowing the principal amount, while the APR represents the total cost of borrowing that includes most fees and finance charges. Because it provides a more inclusive picture, the APR allows for a fairer side-by-side comparison across different loan products and lenders.


Read the fine print, ask questions, and pay close attention to both the interest rate and APR before making your decision. With a clear grasp of this distinction, you can move forward with confidence in choosing the most favorable financing option for your needs.


The information is provided for educational and informational purposes only. Such information or materials do not constitute and are not intended to provide legal, accounting, or tax advice and should not be relied on in that respect. We suggest that You consult an attorney, accountant, and/or financial advisor to answer any financial or legal questions.