The Loan Refinance Calculator helps you determine whether replacing your existing auto loan, student loan, or personal loan with a new loan at better terms will actually save you money — and how long it takes to break even on any fees. Unlike mortgage refinancing (which has its own dynamics), non-mortgage refinancing typically involves minimal closing costs and faster break-even periods, making it a simpler but still consequential decision.

Refinancing works by taking out a new loan to pay off your existing loan. The goal is almost always one or more of: a lower interest rate, a lower monthly payment, a shorter payoff timeline, or a release of a co-signer. Done correctly, it is one of the highest-return financial moves available — no investing required, no market risk. Refinancing a $35,000 auto loan from 9% to 5.5% APR with 48 months remaining saves $3,118 in interest, guaranteed.

The primary situations where refinancing non-mortgage loans makes sense:

• Your credit score has improved significantly since you took out the loan (e.g., from 620 to 720+), unlocking materially better rates.
• Market interest rates have fallen. The Federal Reserve's rate-cutting cycle that began in September 2024 has modestly reduced rates on some loan categories, though as of 2025 rates remain elevated versus 2020–2021 lows.
• You're in financial stress and need to reduce your monthly payment by extending the term (accepting more total interest to survive a cash-flow crunch).
• You want to remove a co-signer who originally helped you qualify.
• You financed through a dealership at an inflated rate and can now refinance directly with a bank or credit union at a lower rate.

The situations where refinancing is typically not worthwhile: when you're near the end of your loan (little interest remains), when your credit has deteriorated, when the new loan has high origination fees that exceed interest savings, or when the loan has a steep prepayment penalty. This calculator quantifies all of these trade-offs precisely.

In Canada, auto and personal loan refinancing follows comparable economics. Major banks including TD, RBC, and Scotiabank offer refinancing products, and many borrowers benefit from credit union options at rates governed by provincial regulations. The Financial Consumer Agency of Canada (FCAC) provides borrower guidance on evaluating refinancing offers.

Two core calculations drive every refinancing decision: (1) monthly savings and (2) break-even period. The CFPB's auto refinancing guidance recommends computing both before proceeding.

Step 1: Calculate the new monthly payment using the standard amortization formula:

Step 2: Calculate monthly savings:

Step 3: Calculate the break-even period (if there are refinancing fees):

Step 4: Calculate total interest savings:

Full worked example — auto loan refinance:

This refinance pays for itself in just over 4 months and saves $1,605 over the remaining loan life — an obvious yes. The Federal Reserve G.19 data shows 60-month new-car rates averaged 7.52% at commercial banks in early 2026, suggesting borrowers who financed in 2022–2023 at peak rates of 8–11% have meaningful refinancing opportunities if their credit is strong.

Enter your current loan details and your proposed new loan offer to instantly see whether refinancing benefits you:

1. Gather your current loan statement. You need: (a) the current outstanding balance (not the original loan amount), (b) your current APR, and (c) the number of monthly payments remaining. These are all on your monthly statement or accessible through your lender's online portal.
2. Enter current loan details. Input the outstanding balance, current APR, and remaining term in months. The calculator will compute your current payment and total remaining interest obligation.
3. Enter the new loan offer. Input the new APR (from your prequalification or formal offer), the new term in months, and any fees. For most auto refinancing, fees are $0–$500 (title transfer, origination). For personal loan refinancing, watch for origination fees of 1–8% of the loan amount — these significantly affect the true savings.
4. Interpret the break-even period. If the break-even is under 12 months and you plan to keep the loan for its full term, refinancing is almost certainly worthwhile. If break-even is 24+ months and you might sell the vehicle or pay off the loan early, it may not make sense. For student loan refinancing (federal to private), the break-even is less relevant than the permanent loss of federal protections.
5. Check the total interest savings. This is the true value of the refinance. Even a modest $50/month payment reduction can translate to $2,000–$3,000 in interest savings over a 48-month loan.
6. For student loan refinancing specifically: Understand that refinancing federal student loans into a private loan permanently eliminates access to income-driven repayment plans (IBR, PAYE), Public Service Loan Forgiveness (PSLF), federal forbearance, and discharge options. The Department of Education (studentaid.gov) recommends exhausting all federal options before refinancing to private. Only refinance federal loans privately if you have stable income, no plans to pursue PSLF, and the rate savings are substantial (2%+ reduction).
7. Compare lenders, not just rates. Get quotes from at least 3 sources. Credit unions commonly beat banks by 0.5–1.5% on auto refinancing. Check for auto-pay discounts (typically 0.25%) that can further reduce your rate.

The calculator delivers several metrics that tell different parts of the refinancing story. Understanding each helps you make an informed decision rather than anchoring solely on monthly payment.

Monthly Payment Reduction

The most visible number. A $72/month reduction might seem small, but over 54 months it represents $3,888 in cash flow returned to you. However, never evaluate refinancing by monthly payment alone — a longer term can reduce your payment while increasing total interest. The calculator explicitly shows both effects.

Break-Even Period

The number of months until your accumulated monthly savings exceed any fees paid. For zero-fee auto refinancing, break-even is instant — every month at the lower rate saves money. For refinancing with origination fees, a sub-12-month break-even is excellent; 12–24 months is acceptable if you'll keep the loan to term; 24+ months requires scrutiny. Per CFPB guidance, always verify you won't pay off the loan before the break-even date.

Total Interest Saved

This is the most important long-term number. A 3.5% rate reduction on a $30,000 auto loan with 60 months remaining saves approximately $2,700 in total interest — that's the equivalent of investing $50/month for 5 years at a guaranteed 9% return, which would be exceptional for any investment. Rate reductions on non-mortgage loans are one of the highest-certainty personal finance improvements available.

Effective APR of the New Loan (with fees)

When fees exist, the effective cost of the new loan is higher than the quoted rate. A 5% loan with a 2% origination fee on a 36-month term has an effective APR of approximately 6.4%. The calculator computes this so you can compare it directly against your current APR rather than the advertised new rate.

What the calculator cannot tell you: Whether your credit profile will actually qualify for the quoted rate (you need to apply for a prequalification), whether your vehicle has positive equity sufficient to refinance (lenders typically require loan-to-value under 125%), or whether state fees (title transfer, registration) will add unexpected costs. In most U.S. states, auto loan refinancing requires a title transfer, which costs $15–$75. The Federal Reserve G.19 and Experian's annual credit review publish current rate benchmarks to help you assess whether an offer is genuinely competitive.

• Wait for a 1%+ rate improvement — the 1% rule. As a rule of thumb, refinancing a non-mortgage loan is most clearly worthwhile when you can reduce your APR by at least 1 full percentage point. A 1% reduction on $30,000 over 48 months saves approximately $614 in interest. Below 0.5%, the savings are often marginal and the administrative effort may not be worth it unless you're extending or shortening the term with a specific goal.
• Refinance sooner rather than later in the loan's life. The interest savings from refinancing decrease the closer you are to payoff, because the remaining balance and interest obligation are smaller. If you financed a vehicle at a high rate 2 years ago with 5 years remaining, you're still in the high-interest phase — refinancing now captures the most savings. With only 12 months left, the interest remaining is minimal and refinancing rarely makes mathematical sense.
• Target credit union lenders for auto refinancing. Credit unions consistently offer the lowest auto refinancing rates. Per the National Credit Union Administration (NCUA), the average credit union used-auto loan rate in December 2025 was approximately 7.4% vs. 8.3% at commercial banks — nearly 1 percentage point lower. You typically need to be a member, but many credit unions allow anyone in a geographic area or affiliated employer to join.
• Never refinance federal student loans to private without modeling PSLF first. If there's any chance you'll work for a government employer or 501(c)(3) nonprofit for 10 years, PSLF (Public Service Loan Forgiveness) can eliminate your entire remaining balance tax-free after 120 qualifying payments. That benefit has no equivalent in the private market. At current graduate school borrowing rates of 7.94%–8.94% (studentaid.gov 2025–2026 rates), the math for PSLF can save $100,000+ over refinancing to private.
• Use rate-reduction as leverage with your current lender first. Before applying elsewhere, call your existing lender and ask about their rate-modification programs. Many lenders, particularly credit unions, will reduce your rate in lieu of losing the account entirely. This takes 10 minutes and involves no hard inquiry on your credit.
• Watch for prepayment penalties on your existing loan. Before refinancing, confirm your current loan has no prepayment penalty. Some finance company auto loans from dealerships include penalties of 1–2% of the outstanding balance for early payoff. Factor this cost into your break-even calculation. A $480 prepayment penalty on a $24,000 balance at 2% adds 6+ months to the break-even on a loan with $72/month savings.
• In Canada, consider rate holds and timing around Bank of Canada announcements. Canadian variable-rate loan products move with the Bank of Canada's overnight rate. When the BoC is in an easing cycle (rate cuts), locking in a fixed refinance rate immediately before a series of expected cuts may be suboptimal — consider whether a variable-rate product offers better long-term economics based on Bank of Canada policy signals.