# Student Loan Refinancing: The Break-Even Calculator
Refinancing student loans with a private lender can meaningfully reduce your interest cost — but federal student loans carry protections that private loans do not, and those protections have real dollar value. The math on whether to refinance has two parts: the interest savings calculation, and the value of what you give up.
What refinancing does
Refinancing replaces your existing loans (federal, private, or both) with a new private loan at a new interest rate. If your credit and income have improved since you graduated, you may qualify for a rate several points below your current federal rate. On a large balance, even a 1.5-point reduction saves thousands over the remaining term.
The mechanics: you apply to a private lender, they pay off your existing loans, and you begin payments on the new loan. There are typically no origination fees for student loan refinancing, which makes the break-even calculation simpler than, say, a mortgage refinance.
The federal protection tradeoff
Federal student loans include income-driven repayment (IDR) plans, which cap your payment at 5–10% of discretionary income. They include Public Service Loan Forgiveness (PSLF) for qualifying government and nonprofit employees. They include deferment and forbearance options during financial hardship.
Once you refinance into a private loan, all of these options are gone. The value of these protections depends entirely on your situation:
- If you work in the private sector, plan to pay off the loans aggressively, and have a stable income, the protections have limited practical value. The interest savings may clearly win.
- If you are pursuing PSLF, refinancing is almost certainly a mistake — you would be giving up forgiveness for a rate reduction.
- If your income is variable or you are early in a career, IDR protection has real option value that is difficult to quantify.
Student Loan Refinance
Compares your current loan vs. a refinance offer. Pure-math comparison — does NOT include the value of federal protections you give up by refinancing federal loans into private.
Refinancing federal loans into private permanently forfeits Public Service Loan Forgiveness, Income-Driven Repayment, federal deferment, and any future federal forgiveness. The math savings below do not include the value of those protections.
Educational illustration — not financial advice. Math: @/lib/finance/auto.ts (loanRefi). Doesn't account for the qualitative value of federal protections. Always read the new lender's terms.
How to read the break-even
Unlike a mortgage refinance, student loan refinancing typically has no closing costs. The break-even is simply: how long until the cumulative interest savings equal zero (they always save from month 1 if the rate is lower). The real question is total savings over the remaining term.
The calculator shows total lifetime interest under both scenarios. The difference is your savings from refinancing — and is directly comparable to the dollar value you place on the federal protections you are giving up.
Who should strongly consider refinancing
- Private-sector employees who do not qualify for PSLF
- Borrowers with stable income and an emergency fund who would not need forbearance
- Graduate and professional degree holders with high-balance, high-rate PLUS loans (often 7–9%)
- Anyone who has already paid off their lowest-balance federal loans and is carrying only larger, higher-rate ones
Who should not refinance without very careful analysis
- Anyone pursuing or eligible for PSLF
- Teachers, nurses, and other public service workers
- Anyone with income variability who might need IDR protection
- Borrowers within 2–3 years of a forgiveness event under any IDR plan
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*Related: [The amortization illusion](./amortization-illusion) explains how the interest-principal split changes over a loan's life — relevant when deciding whether to extend or shorten your term on refinancing.*
Frequently Asked Questions
when does student loan refinancing break even
Break-even occurs when the interest savings equal your refinancing costs. Calculate by dividing origination fees by your monthly savings—if you save $100/month and pay $1,500 to refinance, break-even is 15 months, assuming you keep the loan that long.
should I refinance my student loans
Refinance only if your break-even point is short relative to your payoff timeline and you don't need federal protections like income-driven repayment or forgiveness. Private refinancing permanently loses federal benefits that may be worth more than interest savings.
what do you lose when you refinance federal student loans
Refinancing federal loans to private loans eliminates access to income-driven repayment plans, Public Service Loan Forgiveness, deferment options, and federal protections. These benefits can be worth tens of thousands of dollars, potentially outweighing interest savings from refinancing.