How Does Interest Work on a Personal Loan?

Most personal loans are installment loans with a set repayment schedule. Each monthly payment generally covers interest on your outstanding principal balance, plus a portion of the principal. As the balance falls, the interest portion usually decreases and more of the payment goes toward principal. 

Your annual percentage rate (APR) includes the interest rate and certain 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. Compare APR, monthly payment and total repayment when evaluating offers. 

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MoneyLion offers a service to help you find personal loan offers. Based on the information you provide, you can get matched with offers for up to $100,000 from our top providers. You can compare rates, terms, and fees from different lenders and choose the best offer for you.

Fixed vs. Variable Interest Rates on Personal Loans

Most personal loans have fixed rates, so the scheduled principal-and-interest payment stays the same for the loan term. Variable-rate personal loans are less common. 

Their rates can move with a benchmark, which may cause your payment or total cost to rise or fall. Before choosing a variable rate, check the index, margin, adjustment schedule, rate caps and highest possible payment.

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

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

How Simple Interest Works

Simple interest is calculated with this basic formula:

Interest = principal × interest rate × time

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 rate and any other fees, such as loan origination fees.

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 down 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.

An Example of a Typical Interest Calculation

Here’s a simplified example of an amortized personal loan. If you borrow $10,000 at a fixed 10% APR for 36 months, the payment would be about $323 per month. You would repay about $11,616 in total, including about $1,616 in interest, before any fees.

A typical amortizing payment includes both interest and principal. In the first months, more of the payment generally goes toward interest because the balance is larger. As you pay down the principal, the interest portion usually declines. The exact schedule depends on the lender’s calculation method, payment timing and fees.

For a single monthly period, a simple estimate is:

Interest for the period = outstanding principal × annual interest rate ÷ 12

Do not multiply the original principal by the annual rate and the full term to estimate the total interest on a standard amortized personal loan. That formula is a simplified illustration, not the actual payoff calculation for most installment schedules.

Your monthly payment depends on the loan amount, APR and repayment term. For a practical example, see how much a $5,000 loan could cost per month.

What Is a Good APR on a Personal Loan?

There’s no single APR that is good for every borrower. The offer you receive depends on your credit history, income, debts, loan amount, term, lender and current market conditions. Compare offers with the same loan amount and term, and look at APR, monthly payment, origination fees, total repayment and prepayment terms together.

A lower APR is not always the lower-cost offer if it comes with a longer term or significant fees. A shorter term may reduce total interest but raise the monthly payment, so choose a payment you can manage.

That said, 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 average loan rates can look quite different year to year, or even month to month.

According to the Federal Reserve, the average rate on a 24-month personal loan from a bank is 11.90% APR as of August 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 way to get the best personal loan interest rates is to improve your credit score. Taking out a loan and making on-time payments can improve your credit over time. You should also check your credit report for any errors and aim to keep your credit card usage low.

To get the lowest rate, 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, since it requires collateral up front, making 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.

Key Terms

• Principal: The amount borrowed that you must repay.

• Interest rate: The percentage charged for borrowing money, excluding certain fees.

• Annual percentage rate (APR): A broader measure of borrowing cost that includes the interest rate and certain fees.

• Amortization: The process of repaying a loan through scheduled payments that cover interest and principal.

• Fixed interest rate: A rate that stays the same for the loan term.

• Variable interest rate: A rate that can change based on a market benchmark.

• Prepayment penalty: A fee some lenders charge when a borrower pays off a loan early.

Sources:

• Consumer Financial Protection Bureau: What is a personal installment loan?

• Consumer Financial Protection Bureau: Calculating loan payments

• Consumer Financial Protection Bureau: What is the difference between a loan interest rate and the APR?

• Consumer Financial Protection Bureau: What’s the difference between a simple interest rate and precomputed interest?

Parts of this article were created with AI assistance. Our editors reviewed, fact-checked and edited the final version.

Emily Gadd, CCC™, contributed to editing this article.

Photo Credit: VorDa / Getty Images / iStockphoto