Debt & Borrowing

Understanding Student Loans

The basics of federal and private student loans, how interest accrues, and factors to weigh before and after borrowing.

7 min readUpdated February 5, 2024

Federal vs. private student loans

Student loans generally fall into two broad categories: federal loans, which are issued by the government under terms set by law, and private loans, which are issued by banks, credit unions, or other private lenders under terms the lender sets.

Federal loans often come with certain borrower protections and repayment options, such as income-driven repayment plans or deferment options, that are set by federal rules. Private loans vary more by lender, and their interest rates, fees, and repayment terms depend on the specific lender's offerings and, often, the borrower's or a cosigner's creditworthiness.

Subsidized vs. unsubsidized loans

Among federal loans, a common distinction is between subsidized and unsubsidized loans. With a subsidized loan, interest generally does not accrue while the borrower is in school at least half-time, during certain grace periods, or during deferment, because the government covers that interest. With an unsubsidized loan, interest generally begins accruing as soon as the loan is disbursed, even while the borrower is still in school.

This distinction matters because unpaid interest on an unsubsidized loan can accumulate over several years of school and, depending on the loan terms, may be added to the principal balance at some point, which means future interest could be calculated on a larger amount.

How interest accrues on student loans

Student loan interest is typically calculated daily based on the outstanding principal balance and an annual interest rate, then usually charged to the account monthly. For example, a loan with a $10,000 balance and a 5% annual interest rate accrues roughly $1.37 per day in simple daily interest ($10,000 × 0.05 ÷ 365), or a little over $41 in a 30-day month, before any payment is applied.

Making any payment while in school, even a small one covering just the accruing interest, can prevent interest from building up and potentially being added to the principal later, though whether this is worthwhile depends on individual circumstances and loan terms.

Repayment plans and options

Federal student loans often offer multiple repayment plan options, including standard fixed repayment over a set number of years, and income-driven plans that generally base the monthly payment on income and family size, with terms that can change over time as rules are updated. Private loans typically have less flexibility, though some offer their own hardship options.

Some loans, again typically federal ones, may allow for deferment or forbearance in certain circumstances, which can pause or reduce payments temporarily, though interest may still accrue during these periods depending on the loan type, potentially increasing the total amount owed over time.

Weighing how much to borrow

Because student loans are typically repaid over many years, it can help to think about the total amount borrowed relative to an expected future income, rather than focusing only on the amount needed to cover a given semester. Borrowing calculators and standard repayment estimates, available from loan servicers, can offer a rough sense of what a future monthly payment might look like on a given balance.

It is also worth remembering that living expenses, not just tuition, are sometimes covered through loans, and borrowing only what is genuinely needed for a given period can help limit the total balance to be repaid later.

Common mistakes to avoid

A common mistake is not understanding the difference between subsidized and unsubsidized loans or between federal and private loans before borrowing, since the terms can differ substantially. Another is ignoring loan statements during school, which can mean missing the chance to make small interest payments that could reduce the balance that eventually enters repayment.

Failing to explore federal options fully before turning to private loans is another common issue, since private loans generally do not offer the same range of federal borrower protections and repayment plan options.

Next steps

If you are considering student loans, review the specific terms of any loan offer, including whether it is subsidized or unsubsidized, federal or private, and what the interest rate and repayment terms are. If you already have loans, request your current loan details from your servicer and consider what repayment plan option might fit your situation as you approach repayment.

This guide is general financial education, not personalized financial, tax, or legal advice. See our disclaimer.

Put it into practice

Thrive turns these ideas into hands-on practice. Work through the curriculum or try an interactive simulation — all with practice money.

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