
Understanding the interest on your student loan is important to ensure that you are not paying more than you need to. Most student loans use simple interest, meaning that interest is only paid on the principal amount. However, some student loans use compound interest, where interest is paid on the principal amount and any unpaid interest. Compound interest can cause the amount owed to grow exponentially. Interest on student loans typically begins accruing on the first day the funds are disbursed, and continues to accrue until the loan is paid off.
| Characteristics | Values |
|---|---|
| Types of Interest | Simple, Compound |
| Simple Interest | Interest paid only on the amount borrowed |
| Compound Interest | Interest paid on the amount borrowed and any accrued interest |
| Student Loans with Simple Interest | Most student loans, including federal student loans |
| Student Loans with Compound Interest | Some private student loans, rare cases of federal student loans |
| Interest Accrual Start Date | First day of loan disbursal |
| Interest Accrual End Date | Full repayment of the loan |
| Interest Calculation for Simple Interest | Principal x Interest rate x Loan term |
| Interest Calculation for Compound Interest | More complicated than simple interest calculation |
| Daily Interest Calculation | (Interest rate/365) x Principal |
| Capitalization | Adding unpaid interest to the principal balance, increasing overall loan cost |
| Avoiding Capitalization | Paying at least the interest amount each month |
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What You'll Learn

Most student loans have simple interest
The simple interest formula is calculated by multiplying the daily interest rate, the principal (loan balance), and the number of days between payments. For example, if you have a daily interest rate of 0.04%, a principal of $15,000, and a five-year repayment term, the simple interest on this loan would be $3,000. This equates to a daily interest charge of approximately $1.64.
Federal student loans, including subsidized and unsubsidized loans, typically use simple interest. With subsidized loans, the government pays the interest that accrues while a student is enrolled in college for at least half of the time, whereas with unsubsidized loans, interest begins accruing as soon as the funds are disbursed. Private student loans may also have simple interest, but some use a daily compound interest formula, where accrued interest is continually added to the balance.
Even with simple interest loans, compounding can still occur under certain circumstances. For example, if a borrower is unable to make payments on federal student loans, they may be eligible for deferment or forbearance, during which interest can accrue and be added to the principal loan balance through a process called capitalization. This results in higher overall loan costs.
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Compound interest is rare, but more expensive
Most student loans have simple interest, which is calculated based on the original amount borrowed. However, compound interest, which is calculated on the loan amount plus any unpaid interest, is rare but more expensive. While all federal student loans use simple interest, some private student loans use compound interest.
Simple interest is calculated using the formula: Principal x Interest rate x Loan term = Simple interest. For example, a $15,000 student loan with a 4% interest rate and a five-year repayment term would result in $3,000 in simple interest over the life of the loan. The daily interest for this loan would be approximately $1.64.
Compound interest, on the other hand, is calculated using the formula: (Principal x (1 + Interest rate) ^ Number of compounding periods per year) - Principal = Compound interest. For example, a $20,000 loan with a 5% interest rate and a five-year repayment term would result in compound interest of $5,525.63. The daily interest for this loan would be approximately $2.72 at the beginning of the repayment term.
With compound interest, the daily interest is continually added to the balance, leading to exponential growth over time. This results in higher total borrowing costs compared to simple interest loans. For example, a $30,000 loan with a daily interest of $3 would become $30,003 the next day, with the daily interest charge also increasing.
While simple interest loans are more common, even these loans can have compounding factors. For instance, if a borrower struggles to make payments and opts for deferment or forbearance, the unpaid interest can be added to the principal loan balance, a process known as capitalization. This increases the amount on which interest is charged, making the loan more expensive.
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Interest accrues from the day a loan is disbursed
For example, if you borrow $10,000 for your final year of school at an annual interest rate of 3.65%, with repayment starting exactly one year after you receive your loan funds, you will accrue $1 in interest per day, totalling $365 by the time repayment starts. If you do not pay off the $365 before repayment, it will be added to your principal, increasing it to $10,365. This, in turn, will increase your daily interest charge.
Most student loans have simple interest, meaning that interest is only paid on the amount borrowed. However, some private student loans use a daily compound interest formula, where accrued interest is continually added to the borrower's balance. Compound interest requires the borrower to pay interest on the amount borrowed plus any accrued interest.
Subsidized student loans are for students who can demonstrate financial need. The government pays the interest that accrues while the student is enrolled in college for at least half the time, a minimum of six credit hours. Unsubsidized student loans, on the other hand, begin accruing interest as soon as the funds are disbursed, and the interest is not paid by the government.
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Capitalization increases the amount you pay interest on
Most student loans have simple interest, which means that interest is calculated based on the amount you originally borrowed. However, capitalization increases the amount of interest you pay on your student loans. Capitalization is when unpaid interest is added to the principal balance of your loan, increasing the total amount you have to pay back. This typically happens after periods of nonpayment, such as during deferment or forbearance. For example, if you choose to request a student loan deferment, your interest will continue to accrue (grow) and any unpaid interest will be added to your loan’s Current Principal at the end of the deferment period. This will increase your total loan cost.
Capitalization can significantly increase the amount you pay in interest over the life of the loan. For example, if you borrowed $5,000 per year for four years at a 5% interest rate, you would accrue $2,937 in interest over those four years and during a six-month grace period. At repayment, that interest amount will capitalize and be added to your balance. If you paid off the accrued interest before it capitalized, your monthly payment would be lower and you would save money over the life of the loan.
You can avoid or lower the amount of capitalized interest by paying at least the interest on your loan each month. If you’ve chosen the interest repayment option for your student loans, your interest shouldn’t capitalize, since you’ve paid it as it has accrued throughout school. Alternatively, if you’re making fixed payments or deferring payments until after school, try to make small additional payments to cover the accrued interest.
While most student loans have simple interest, there are some circumstances where federal student loans may have compound interest, and some private student loans also have compound interest. Compound interest requires you to pay interest on the amount borrowed plus any accrued interest. This means that you’re always paying interest on your interest, and the daily interest rate is applied to the principal plus any unpaid interest up to that moment. This can result in exponential growth in the balance as the longer the interest goes unpaid, the more the balance increases.
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Fixed vs variable interest rates
Interest on student loans can be either simple or compound. Most student loans have simple interest, which is calculated based on the amount you originally borrowed. However, there are some circumstances where federal student loans may have compound interest, and some private student loans also have compound interest. With compound interest, you pay interest on the principal amount as well as any unpaid interest, which can lead to higher total borrowing costs.
When it comes to choosing between a fixed or variable interest rate for your student loan, there are several factors to consider. Firstly, all federal student loans have fixed interest rates, while private student loans typically offer both fixed and variable rate options. Fixed-rate loans provide stability since the interest rate remains constant throughout the loan term, making your monthly payments predictable. Variable-rate loans, on the other hand, can offer lower initial rates, but these rates can change periodically in response to market conditions, which may cause your monthly payments to fluctuate.
Fixed-rate student loans are generally recommended if you prefer predictable monthly payments or if you have a long loan term. They are also a safer option in a high-rate environment since the rate remains fixed even if market rates increase. Variable-rate student loans may be a good choice if you qualify for the lowest rates and plan to pay off the loan relatively quickly. Additionally, variable rates can be beneficial if you anticipate market improvements that could lower your interest rate.
It's important to note that the choice between fixed and variable interest rates depends on your individual circumstances and preferences. While fixed rates offer stability, variable rates provide the opportunity to take advantage of lower rates during favourable market conditions. However, it can be challenging to predict market movements, and there is a risk that variable rates may increase over time. Therefore, if you are unsure, it is generally recommended to choose a fixed-rate loan for the added security and peace of mind.
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Frequently asked questions
Most student loans have simple interest, which is calculated based on the amount you originally borrowed. However, some private student loans use a daily compound interest formula, where accrued interest is continually added to your balance.
Simple interest is calculated using the formula: Principal x Interest rate x Loan term = Simple interest. Compound interest is calculated based on your loan amount plus any unpaid interest that has accrued.
All federal student loans use simple interest.
Capitalization is when unpaid interest is added to your principal balance, increasing the amount on which you pay interest going forward.
You can avoid capitalization by paying at least the interest on your loan each month.







































