2026-09-21 7 min read

Loan Refinance Savings Calculator

The net saving from refinancing after costs for a loan. Live calculator with worked steps, charts.

Calculator

Current Loan Balance Help

The payoff balance today, not the original amount borrowed.

Current Interest Rate(%)

Remaining Term Today(years)

years

New Interest Rate(%)

New Loan Term(years)

years

Closing Costs

Payment Frequency

This general loans calculator runs on the standard amortisation model: interest is charged on the outstanding balance each month, and anything extra you enter is applied to principal immediately.

Results

Optimal

Net Interest Saving

$1,030

After refinance costs.

Monthly Payment Saving

$37

Payment Before

$579.34/month

Payment After

$542.26/month

Interest If Nothing Changes

$5,809

Interest on the Refinanced Loan

$4,029

Refinance Costs

$750

Break-Even

20.2 months

New Payoff Date

48 payments from today

Live results update as you type — currently showing net interest saving of $1,030 on 12 payments a year. Replace the defaults with your own quote for an exact comparison.

Visualizations

Remaining Interest by Option

5,809Keep current loan

4,779Refinance

Where the Saving Goes

Interest avoided50%

Costs paid21%

Net saving29%

Formula

Refinancing replaces the remaining interest on the current loan with the interest on the new loan plus the costs of switching. The difference is the net saving.

Net saving = (Interest before − Interest after) − Costs

Variables

Symbol	Name	Unit	Description
Interest before	Remaining interest	currency	Interest left on the existing loan
Interest after	New interest	currency	Interest on the refinanced balance
Costs	Refinance costs	currency	Fees, points and closing costs

Explanation

This is what the refinance is worth after the new interest and the costs of switching are both accounted for.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Establish what is left on the current loan at today’s rate.

Interest remaining = payment × remaining payments − balance

Balance:$22,000

Rate:12.00%

Remaining:4 years

Result: $5,809 of remaining interest

Step 2

Reprice the balance at the new rate and term.

P = A × i ÷ (1 − (1 + i)^−n)

New rate:8.50%

New term:4 years

Result: $542.26 /month · $4,029 interest

Step 3

Subtract the new interest and the costs from what you would have paid.

Net saving = old interest − new interest − costs

Intermediate: $5,809 − $4,029 − $750

Result: $1,030 saved

Final Answer

$1,030

Worked Examples

See how the calculator works with different scenarios.

Scenario

The loan refinance savings calculator run on the values above, showing the full calculation path rather than only the answer.

Inputs

Balance:22000

Current Rate:12

Frequency:monthly (12 per year)

Calculation

1. Establish what is left on the current loan at today’s rate. → $5,809 of remaining interest 2. Reprice the balance at the new rate and term. → $542.26 /month · $4,029 interest 3. Subtract the new interest and the costs from what you would have paid. → $1,030 saved

Result

Net Interest Saving: $1,030

Interpretation

Refinancing $22,000 from 12.00% to 8.50% over 4 years saves $1,030 after $750 of costs.

Understanding Your Result

Your Result: Net Interest Saving: $1,030

Typical range: A refinance is usually worthwhile when the new rate is at least 0.5–1.0 percentage points lower and you will stay in the loan beyond the break-even point.

What This Means

This is what the refinance is worth after the new interest and the costs of switching are both accounted for.

Why It Matters

Refinancing $22,000 from 12.00% to 8.50% over 4 years saves $1,030 after $750 of costs.

Professional Interpretation

Refinancing $22,000 from 12.00% to 8.50% over 4 years saves $1,030 after $750 of costs.

How this is calculated

Refinancing replaces the remaining interest on the current loan with the interest on the new loan plus the costs of switching. The difference is the net saving.

What drives the result

Any structure that delays principal repayment keeps the balance higher for longer, and because interest is charged on the balance, the total cost rises. Conversely, anything that accelerates repayment — a shorter term, an extra principal payment, a faster frequency — lowers the average balance and therefore the finance charge.

Recommendations

•Watch the term: refinancing a 4-year balance into a 7-year loan can lower the payment and still raise total interest.
•Check whether the current lender charges a prepayment penalty or a fee to release the lien.

Educational Content

Introduction

Loan structure determines when cash leaves your account and how much flexibility you keep. Interest-only periods, balloons, deferred starts, graduating payments, refinancing and biweekly schedules all change the timing of principal repayment without changing the formula behind it. This page prices the structure, not just the rate.

Concept Explanation

Applications

▸Choosing between a lower payment now and a lower total cost

▸Testing whether refinancing or restructuring is worth the fees

▸Planning around a balloon, a reset date or the end of a promotional period

▸Deciding how much extra to pay and whether it is better used to invest

Benefits

•Prices structures that are hard to compare by eye
•Shows the payment step-up or lump sum you must plan for
•Quantifies the break-even point on any restructuring cost
•Separates cash-flow relief from genuine savings

Limitations

•Assumes rates, income and repayment behaviour stay as entered
•Lender-specific rules (recast fees, minimum payments, penalties) are not automatic
•Tax treatment of interest, penalty and forgiven amounts is not included
•Real-life events such as a sale or refinance can change the outcome entirely

Best Practices

•Match repayment to the life of the asset being financed
•Write down the exit plan for any balloon or reset before signing
•Compare structures on total cost over the horizon you will actually hold
•Keep a cash buffer instead of pushing every dollar into principal

Common Misconceptions

Myth: A lower payment is always a win

Truth: Lower payments usually mean more periods and more interest unless the rate falls enough to compensate.

Myth: Structures are set in stone

Truth: Many loans allow recasting, extra payments or rate renegotiation — ask before assuming.

Practical Tips

•Compare a cash-out refinance with a separate second lien before adding the balance to the first mortgage.
•Check for prepayment penalties and release fees on the existing loan.

Common Mistakes

Refinancing to lower the payment while extending the term

That usually raises total interest even at a lower rate.

Rolling costs into the new balance without adjusting the term

Financed costs increase the amount on which interest accrues.

Assumptions

This calculator makes the following assumptions to provide estimates:

The new loan is held to maturity: Selling or refinancing earlier shortens the saving.

Limitations

Be aware of these limitations when using this calculator:

Limitation: Assumes rates, income and repayment behaviour stay as entered

Limitation: Lender-specific rules (recast fees, minimum payments, penalties) are not automatic

Limitation: Tax treatment of interest, penalty and forgiven amounts is not included

Limitation: Real-life events such as a sale or refinance can change the outcome entirely

Frequently Asked Questions

Answers to common questions about this calculator.

How much lower should the rate be?

At least 0.5–1.0 percentage points, and only if you will stay past the break-even point.

Should I keep the same term or extend it?

Keep it. Extending the term is the fastest way to turn a refinance into a more expensive loan.

Who uses the loan refinance savings calculator?

It is used by borrowers comparing loan offers, by advisers checking a quote before a client signs, and by lenders and brokers sanity-checking a payment, ratio or fee structure. It sits in the General Loans group of the Loans & Lending section of Atlascalcs.

How accurate is the loan refinance savings calculator?

Every figure follows directly from the inputs using standard amortisation mathematics, so it is accurate to the quality of the values you enter. Lenders round payments and apply their own day-count conventions, so expect small differences against a formal statement or payoff quote.

How current are the rates and thresholds used here?

The calculator uses the figures you enter, so update the rate to your actual offer or current market quote. Ratio thresholds, poverty guidelines and programme rules reflect the conventions described in the references and change periodically.

Does rounding change the results?

Every calculation runs on full precision and rounds only for display. Lenders round payments to the nearest cent or dollar, so expect a small difference between these figures and a formal statement or payoff quote.

Should I use the payment or the total cost to compare offers?

Use the payment to judge cash flow and the finance charge or APR to judge cost. When two offers differ on both, the all-in cost over the period you expect to hold the loan is the decisive measure.

Can I use this calculator for a business or commercial loan?

Yes. The payment, amortisation, ratio and cost calculators apply the same amortisation mathematics to commercial loans; the difference is in the fees, covenants and collateral rules, which you should enter explicitly.

What information should I have ready before applying?

Your exact rate and term, the fee schedule, any required add-ons, and your gross income and existing monthly obligations. With those five numbers every figure on this page can be tied back to a lender quote.

Related Calculators

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Related Guides

Deepen your understanding with these educational resources.

Loan repayment and amortisation guide

How payments split between interest and principal, and how to read a schedule.

Borrowing cost and APR explained

Rate versus APR, points, fees and the cost of a longer term.

Qualifying for credit

The ratios lenders use, and how to improve each one before applying.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Refinance: Replacing an existing loan with a new one, typically to lower the rate, the payment, or to release equity.
Break-even point: The point at which savings from a financial change equal the costs of making it.
APR (Annual Percentage Rate): The yearly cost of credit expressed as a rate, including interest and most upfront finance charges.
Prepayment penalty: A fee charged by some lenders when a loan is repaid ahead of schedule.
Finance charge: The total dollar cost of credit, including interest and certain fees.

Authoritative References

Trusted sources and standards referenced by this calculator.

Consumer Financial Protection Bureau — Loan options and disclosures Consumer Financial Protection Bureau — What is a debt-to-income ratio? Federal Reserve — Consumer credit (G.19) statistical release Federal Reserve — Consumer credit and leasing guides U.S. Small Business Administration — Loan programmes Federal Student Aid — Income-driven repayment plans Federal Student Aid — Public Service Loan Forgiveness Federal Trade Commission — Consumer credit guidance

Applicable Standards

Level-payment (simple-interest) amortisation, payments assumed in arrearsAPR computed by discounting the actual payment stream to net proceedsDebt ratios computed on gross income for lender comparisonsMoney rounded for display only; all calculations run at full precision

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Page Information

Last Updated:

2026-09-21

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.