How Does Interest Work on a Personal Loan?

Interest on a personal loan is generally fixed. What does this mean? You'll have equal monthly payments. You'll also need to factor in the amount of interest you owe on top of the funds you borrow, which you'll need to make until the loan is paid off.

Your personal loan annual percentage rate (APR) includes both the interest rate you'll be charged to borrow money and any additional fees, so it represents the total cost of borrowing from a lender. Your exact APR will be determined by your credit score, with higher scores qualifying for lower rates.

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Key Takeaways

• Personal loan interest is usually calculated as simple interest on your outstanding principal balance using the formula Interest = Principal × Rate × Time — meaning your interest costs decrease with each payment as the balance shrinks.

• Most personal loans carry a fixed interest rate, which keeps monthly payments predictable for the life of the loan; variable-rate loans are available but carry the risk of rising payments if market rates increase.

• Your APR is not the same as your interest rate — it includes the interest rate plus fees like origination fees, making it a more accurate measure of the true cost of borrowing.

Summary generated by AI, verified by MoneyLion editors

Fixed vs. Variable Interest Rates on Personal Loans

Although fixed-rate loans are the most common, variable-rate loans are also available. With these, your interest rate can rise or fall as overall interest rates change, such as those influenced by the Federal Reserve.

Here's a side-by-side look at how fixed and variable interest rates compare:

How Interest Is Calculated on Personal Loans

There are several ways to calculate interest on a loan, but most personal loans use simple interest.

How Simple Interest Works

Simple interest is calculated with this basic formula:

There's a difference between interest rate and APR.

APR is a more accurate picture of how much you'll pay to borrow money, because it includes both your interest rates and any other fees, such as loan origination fees.

An Example of a Simple Interest Calculation

Here's a look at how simple interest would work on a personal loan:

• Your loan is $10,000.

• The APR is 10%.

• It's a three-year term.

According to the formula, the simple interest would be ($10,000 x 0.10 x 3), which is $3,000.

This means you'd pay $3,000 to borrow the $10,000, for a total repayment amount of $13,000.

An important note: With a simple-interest loan, you pay interest only on the outstanding principal balance.

• Your balance will decrease with every monthly payment you make.

• The simple interest calculation will change as you pay off more of the loan.

This means you'd pay less than the original $3,000 calculated above to borrow $10,000, with the exact amount depending on the size and the frequency of your loan payments.

What Is a Good APR on a Personal Loan?

Here's what you should expect in the different credit score ranges:

• Excellent credit: 6% to 10% APR

• Average credit: 11% to 20% APR

• Poor credit: 20% and above APR

You can evaluate whether you're getting a good APR on your personal loan by comparing it to average rates across different credit buckets.

What Affects the Interest Rate You Get?

Your credit score is the biggest factor in determining the personal loan interest rate you qualify for, as it reflects your credit risk and the likelihood that you'll repay the loan on time.

Other factors figure into your interest rate as well, including:

• Your income

• Employment status

• The amount of money you're borrowing

• Lender type

• The length of the loan term, with lower amounts and shorter terms qualifying for lower rates than larger amounts and longer terms

Credit unions tend to offer lower rates, especially to those with middling credit, compared to traditional banks

Average Personal Loan Interest Rates in 2026

All interest rates are influenced by the broader market and economic environment and shift in response to the Federal Reserve's target federal funds rate. This means that average loan rates can look quite different on a yearly or even a monthly basis.

According to the Federal Reserve Bank of St. Louis (FRED), the average rate on a 24-month personal loan from a bank is 11.40% APR as of February 2026. This is considered average; however, rates vary by lender and loan type, so always shop around.

How To Lower Your Personal Loan Interest Rate

The best thing you can do is improve your credit score if you want to get the best personal loan interest rates. Taking out a loan and making on-time payments can improve your credit in the long run. You should also check your credit report for any errors and aim to keep your credit card usage low.

To get the lowest rate, you can also consider shorter loan terms and applying with a co-signer who has a strong credit score. Choosing a secured personal loan can also get you a lower rate, as this type of loan requires collateral up front, which makes the transaction less risky for the lender.

Don't forget to compare offers from multiple lenders. This is the best way to secure the lowest rate possible.

Personal Loan Interest FAQs

Is a personal loan interest rate fixed or variable?

Personal loans can be fixed-rate or variable, but fixed-rate loans are much more common.

What APR should I aim for?

Your loan APR will depend on your credit score. If you have a good credit score, search for an APR between 11% and 17%; excellent scores generally qualify for lower rates, and lower scores for higher rates.

Can I negotiate the interest rate on a personal loan?

Your best bet for negotiating the interest rate on a personal loan is to shop around and compare offers from multiple lenders.

Does prepaying help me save on interest?

Yes, prepaying your loan can help you save on interest because you'll only pay interest on the outstanding balance, so the more you pay off, the less you will owe. However, some lenders have prepayment fees that will penalize you for making extra loan payments.

Why is the APR higher than the interest rate?

A loan's APR is higher than the interest rate because it includes both the interest rate and any additional fees you owe, such as a loan origination fee.

Key Terms

• Simple interest: A method of calculating interest only on the outstanding principal balance, using the formula Interest = Principal × Rate × Time. Because interest isn't charged on previously accrued interest, your total interest costs go down as you pay off the loan.

• APR (annual percentage rate): The yearly cost of borrowing expressed as a percentage, including both the interest rate and any fees — such as an origination fee — giving a more complete picture of what a loan actually costs than the interest rate alone.

• Interest rate: The annual cost to borrow money expressed as a percentage of the principal, not including fees. It's always lower than a loan's APR.

• Fixed-rate loan: A loan where the interest rate stays the same for the entire repayment period, resulting in equal, predictable monthly payments.

• Variable-rate loan: A loan where the interest rate can rise or fall over time, typically tied to a benchmark like the Federal Reserve's federal funds rate, which means monthly payments can change.

• Origination fee: An upfront fee some lenders charge to process and fund a new loan. It's factored into the APR, which is why the APR is higher than the stated interest rate.

• Prepayment penalty: A fee some lenders charge if you pay off a loan early or ahead of schedule. Not all personal loans carry this fee, so confirm the terms before signing.

Sources:

• CFPB: What Is the Difference Between a Mortgage Interest Rate and an APR?

• CFPB: What Is a Prepayment Penalty?

• Federal Reserve Bank of St. Louis (FRED): Finance Rate on Personal Loans at Commercial Banks, 24-Month Loan

Summary generated by AI, verified by MoneyLion editors

Jasmin Baron, CCC™, contributed to editing this article.

Photo Credit: VorDa / Getty Images