
Many student loan borrowers are often confused about why their entire payment goes towards paying off the interest on their loan. This phenomenon occurs when the payment amount is less than the interest owed each month, resulting in negative amortization, where the loan balance increases despite regular payments. To avoid this, borrowers can make extra payments to reduce the principal balance faster than it grows, minimizing the overall interest paid over time. Understanding the dynamic between interest, principal, and payment size is crucial for effectively managing student loan debt.
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What You'll Learn
- Interest accrues daily, so the quicker you pay it off, the less you'll pay in total
- Negative amortization: when your loan balance grows despite making regular payments
- Payment plans: IDR, IBR, PAYE, and ICR
- Interest capitalization: when interest is added to your principal
- Extra payments: paying more than the minimum reduces the principal faster

Interest accrues daily, so the quicker you pay it off, the less you'll pay in total
Interest accrues daily on student loans, and it can be challenging to keep up with the accumulating interest charges. When you make a payment, it is first applied to any outstanding fees, then interest, and finally the principal amount. This means that if your payment amount is less than the interest accrued since your last payment, it will only cover the interest, and your loan balance will not decrease.
To pay off your student loan as quickly as possible and minimise the total interest paid, it is crucial to make payments on time and in full. If possible, paying a little extra with each payment can significantly reduce the interest charges over time. This strategy helps you stay ahead of the daily interest accrual and decrease your principal balance faster.
Additionally, it is essential to understand the difference between various repayment plans. Income-driven repayment (IDR) plans, such as the Saving on a Valuable Education (SAVE) plan, offer flexibility by basing your monthly payments on your income. However, if your payments under these plans are not sufficient to cover the monthly interest accrual, negative amortization can occur, causing your loan balance to grow over time.
To avoid this, consider enrolling in a standard repayment plan with fixed equal monthly payments over a set number of years. While this may result in higher monthly payments, it ensures that more of your payment goes towards the principal balance, helping you pay off the loan faster and save on overall interest charges.
Remember, the quicker you pay off your student loan principal, the less interest you will accrue daily. Making extra payments whenever possible and staying on top of your payments can significantly reduce the total cost of your student loan.
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Negative amortization: when your loan balance grows despite making regular payments
Amortization is the process of paying down debt, like a loan or a mortgage. Student loans are generally amortized because they are instalment loans with regular payments. Payments are divided into principal and interest payments.
Negative amortization happens when the monthly payment you make on your student loan doesn’t cover all of the interest due. When interest makes up the majority of your payment—like at the onset of the loan—this can drastically affect the total amount you will owe. If you don’t make the full payment, the difference is added to the total amount owed, meaning the total loan amount will increase by the amount of unpaid interest you have.
For example, say you have a $100,000 student loan at 6% interest. At that rate and balance, the loan accrues approximately $500 in interest each month. Payments are paid first to interest and then to principal. If you have a payment of $800, $500 of that would go to interest, and the remaining $300 to principal. You would then only owe $99,700 the next month, lowering your principal (and as a result also lowering the amount of interest in the next month, which will now be approximately $498.50). However, if you have an ICR plan with a payment of $400, all of that would go to interest, and you would still owe the full $100,000.
Negative amortization can be avoided by paying extra on loans to reduce the principal faster.
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Payment plans: IDR, IBR, PAYE, and ICR
If you're only paying interest on your student loans and not paying down the principal balance, it likely means you're on a flexible repayment plan or your loan has entered a period of forbearance or deferment. Such plans are often chosen by borrowers who are struggling to make ends meet and need a more manageable way to stay current on their loans. Here's a look at some of these payment plans and how they might affect your loan:
Income-Driven Repayment (IDR) plans: These plans, which include options like Income-Based Repayment (IBR), Pay As You Earn (PAYE), and Revised Pay As You Earn (REPAYE), set your monthly payment based on your income and family size. Payments can be as low as 10% of your discretionary income, and any remaining balance is typically forgiven after 20 to 25 years of qualifying payments. While these plans can provide much-needed relief for borrowers struggling to make ends meet, they often result in paying more interest over the life of the loan, as the repayment period is extended.
Income-Contingent Repayment (ICR) plan: The ICR plan calculates your monthly payment based on your income, family size, and the total amount of your Direct Loans. With this plan, you'll pay either 20% of your discretionary income or the amount you would pay on a fixed 12-year repayment schedule, adjusted according to your income. As with IDR plans, any remaining balance is usually forgiven after 25 years of qualifying payments.
Now, how does this relate to only paying interest? When your payments are calculated based on income through IDR or ICR plans, it's possible that your monthly payment won't even cover the interest that accrues on your loan each month. In such cases, you may find yourself only paying the interest or even less than the interest that's accruing, which can cause your loan balance to grow over time. However, during periods of economic hardship or unemployment, these plans can be a lifeline, preventing loan default and negative impacts on your credit history.
Additionally, some loans may enter a period of forbearance or deferment, during which you're allowed to temporarily stop making payments or reduce your payments. Interest, however, continues to accrue, and you may find yourself only paying the interest that built up during this period. This can be particularly common with unsubsidized loans, where interest accrues from the date of disbursement, even during periods of deferment. Checking your loan terms and staying in touch with your loan servicer can help clarify these situations.
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Interest capitalization: when interest is added to your principal
Interest capitalization is a crucial factor in student loans, influencing the total repayment amount. It refers to the process of adding unpaid interest to the principal loan balance. This typically occurs during specific periods, such as the end of a grace period, separation, forbearance, or deferment.
When you take out a student loan, interest begins to accrue from the day the funds are disbursed. During the grace period or deferment, when you are not required to make payments, interest continues to accumulate. Once these periods end, any unpaid interest is capitalized, becoming part of the principal loan amount. As a result, your interest calculations for subsequent payments will be based on this new, higher principal.
For example, consider a $10,000 student loan with a 6.8% interest rate. Daily, this loan accrues $1.86 in interest. If you defer repayment for six months and do not pay off the interest, the loan will accrue $340 in interest during that time. After the deferment period, this accrued interest of $340 is added to your principal balance, resulting in a new principal of $10,340. Consequently, the daily interest increases to $1.93, leading to a higher monthly payment.
To minimize the impact of interest capitalization, it is advisable to make interest payments during your school enrollment or deferment periods. Even paying a portion of the accrued interest can help reduce the amount of interest that capitalizes at the end of the non-payment period. Additionally, if you've chosen the interest repayment option, your interest won't capitalize as you've been paying it off as it accrues.
Understanding interest capitalization is essential for managing your student loan effectively. By being proactive and making informed decisions, you can reduce your total loan cost and avoid paying excessive interest over the life of the loan.
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Extra payments: paying more than the minimum reduces the principal faster
Making extra payments on your student loan can significantly reduce the principal faster. This is because the interest on student loans is typically charged per day. By paying more than the minimum, you can reduce the amount of interest that accrues over time, which in turn lowers the overall cost of the loan.
Let's consider an example: suppose you have a $100,000 student loan at 6% interest. This loan accrues approximately $500 in interest each month. If you make a monthly payment of $800, $500 will go towards interest, and the remaining $300 will be applied to the principal. As a result, you will only owe $99,700 the next month, and the interest for the following month will be slightly lower at around $498.50.
Now, if you make a larger extra payment of $400, the entire $500 interest for that month will be covered, and the remaining $100 will be applied to the principal, reducing your loan balance to $99,600 for the next month. This is how making extra payments can help you pay off your loan faster by reducing the principal more quickly.
It's important to note that both federal and private student loans allow borrowers to make extra payments without incurring any prepayment penalty fees. You can contact your lender to specify that you want any extra payments to be applied directly to the principal value of the loan, which can help speed up the repayment process.
Additionally, paying off your student loans early has other benefits, such as lowering your debt-to-income ratio, strengthening your credit score, and freeing up funds for savings or other financial goals.
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Frequently asked questions
Payments are first applied to interest, then to the principal amount of the loan. If your payment is less than the interest owed, it will only go towards interest. This is known as negative amortization, where your loan balance grows despite making regular payments.
To pay down the principal, you must pay it down faster than it grows, which means increasing your monthly payments. Making extra payments will help reduce the principal balance.
Interest accrues daily on your student loan. To calculate the interest accrued since your last payment, use the following formula: [Loan Amount] x [Interest Rate/360] x [Number of Days Since Last Payment].











































