How US student loans work
In the United States, student loans are legal debt obligations with fixed or variable interest rates. Federal Direct Loans are serviced by designated servicers (such as MOHELA, Nelnet, or Aidvantage) under statutory Department of Education terms.
Interest accrues daily on a simple interest basis. Borrowers can choose between standard 10-year amortization, extended or graduated plans, or income-driven repayment (IDR) plans where payments are tied to discretionary income above HHS poverty guidelines.
Worked example
For a $35,000 federal Direct Loan with a 6.53% interest rate on the standard 10-year plan (120 months), your monthly payment is $397.96.
Over 10 years, you pay $12,755.20 in total interest, bringing your total repayment to $47,755.20.
Making an extra payment of $100 per month accelerates your payoff by nearly 3 years and saves over $3,800 in interest charges with no prepayment penalty.
Inputs for Advanced student loan repayment calculator (US)
Loan balance
Your total outstanding federal or private student loan balance.
Interest rate
Your annual percentage rate (e.g. 6.53% for Direct Undergrad loans).
Repayment term
The length of your repayment schedule in years (standard is 10 years).
CALCULATOR QUESTIONS
Advanced student loan repayment calculator (US) questions
Can I pay off my student loans early without penalty?
Yes. Under the federal Higher Education Act, federal and private student loans have 0% prepayment penalties.
Is student loan interest tax deductible?
Yes. You can deduct up to $2,500 of student loan interest paid each year on IRS Form 1040 Schedule 1, subject to MAGI phaseout limits.