What student loan refinancing actually does
Refinancing pays off one or more existing student loans with a new private loan from a bank, credit union, or fintech lender. The new loan replaces every loan you bring in — meaning if you refinance any federal loan into a private one, that balance is no longer federal. You lose access to income-driven repayment plans (SAVE, PAYE, IBR), federal forbearance, and forgiveness programs including PSLF and Teacher Loan Forgiveness. In exchange, you potentially get a lower rate and the option to change your term length.
When refinancing makes sense
Three conditions usually need to be true simultaneously for refinancing to be a clear win: (1) your current weighted-average interest rate is above 6%, (2) your credit score is at least 700 with stable income, and (3) you have no plans to use federal income-driven plans or pursue forgiveness. If any of these is off, run the numbers carefully — the calculator above strips the math down to total interest saved vs. monthly payment change. Borrowers with mostly federal loans below 5% rarely save enough to justify giving up federal options.
How refinance rates are set in 2026
Private student loan refi rates follow the 10-year Treasury yield plus a credit-risk spread. As of mid-2026, qualified borrowers with 740+ FICO scores see fixed rates between 5.2% and 7.1% APR for 5–10 year terms. Variable rates start lower (around 4.8%) but reset monthly to SOFR + margin and can move 100–200 basis points per year. Co-signers can shave 0.5–1.5 percentage points off your offered rate; many lenders also offer a 0.25% autopay discount.
How we calculate savings
The calculator computes the standard amortizing-loan formula for both your current loan and the proposed refinanced loan, then subtracts. Monthly payment is P × r / (1 − (1 + r)^−n), where P is principal, r is the monthly rate (APR ÷ 12), and n is the number of payments. Total interest is monthly payment × n − P. Lifetime savings = current total interest − new total interest. We do not adjust for any potential federal forgiveness you might be giving up — that decision is qualitative and beyond what a number can show.
Worked Examples
$45K balance, 7.5% → 5.2%, 10 years
| Loan balance | $45,000 |
| Current rate | 7.5% APR |
| New rate | 5.2% APR |
| New term | 10 years |
Saves about $6,300 in total interest. Monthly payment drops $53.
This is the typical "good refi candidate" scenario — a graduate-school borrower with one large balance and a credit profile strong enough to qualify for top-tier private rates. The breakeven on origination costs (most refi lenders charge $0) is immediate.
$28K balance, 5.5% → 4.8%, 7 years
| Loan balance | $28,000 |
| Current rate | 5.5% APR |
| New rate | 4.8% APR |
| New term | 7 years |
Saves about $720 in total interest. Monthly payment rises $42.
Borderline case. The savings exist but are small relative to the federal benefits being surrendered. If this borrower works for a non-profit or government employer, the lost PSLF eligibility alone could exceed the entire $720 savings.
$120K balance, 6.8% → 5.5%, 15 years
| Loan balance | $120,000 |
| Current rate | 6.8% APR |
| New rate | 5.5% APR |
| New term | 15 years |
Saves about $14,400 in total interest. Monthly payment drops $84.
Medical, law, or MBA debt territory. With six-figure balances, even modest rate cuts compound into five-figure savings. The 15-year term keeps the monthly payment manageable while the borrower's income grows.
Frequently Asked Questions
Can I refinance federal student loans without losing them?
No. Once you refinance a federal loan into a private loan, it is permanently private. The federal Direct Consolidation Loan combines federal loans into a single federal loan and preserves federal benefits, but it does not lower your rate — it averages your existing rates rounded up to the nearest 1/8 of a percent.
What credit score do I need to refinance student loans?
Most lenders set a hard floor at 670 FICO. The advertised lowest rates require 740+ with two years of stable income above $40,000, or a creditworthy co-signer. Borrowers below 700 typically see rates within 1–2 points of their current federal rate, which often makes refinancing not worth it.
Does refinancing affect my credit score?
Yes, in two ways. The hard inquiry from the loan application typically costs 5–10 FICO points and recovers in 3–6 months. The new account also lowers the average age of your credit accounts. Both effects are minor compared to consistently paying the new loan on time.
Should I pick a shorter or longer refinance term?
Shorter terms (5–7 years) get the lowest rates and minimize total interest, but raise the monthly payment. Longer terms (15–20 years) cut the payment but cost much more in total interest. A common middle path is matching your original federal loan's remaining term and using the rate cut as pure savings.
Is variable or fixed rate better for student loan refinancing?
Fixed for most borrowers. Variable rates start 50–100 basis points lower but reset monthly, and over a 10-year payback they almost always end up costing more in total. Variable can make sense only if you plan to aggressively pay off the loan in under 3 years.
Can I refinance student loans more than once?
Yes, and many borrowers do. There is no limit. If your credit score improves significantly after your first refi or if rates drop more than 0.75 percentage points, refinancing again can save additional money. There are no prepayment penalties on private student loans.
What is the difference between consolidation and refinancing?
Federal consolidation (through the Department of Education) combines federal loans into one federal loan at the weighted-average rate, with no credit check. Private refinancing replaces federal and/or private loans with a new private loan at a market rate, requiring a credit check. Only refinancing can lower your rate.
Sources
Marcus has spent 12 years analyzing consumer lending, refinancing strategies, and household balance sheets. Former credit analyst at a regional bank, he focuses on translating dense Fed and CFPB data into decisions readers can act on the same day.