Mortgage Refinance Calculator

Monthly payment savings

Monthly savings show the immediate cash-flow difference between keeping the current mortgage and making the new refinance payment.

Always ask why the payment changed. A lower rate can create genuine financing savings, while a longer term can lower the payment simply by spreading principal across more months.

Simple break-even period

Break-even estimates how long monthly savings must continue before they recover the upfront refinance cost.

It is most useful when compared with how long you realistically expect to keep the new mortgage.

Remaining interest under the current loan

This is the interest that would be paid from today through the existing mortgage maturity if you make the scheduled payments and do not refinance, prepay, or modify the loan.

Estimated interest under the new loan

This is the scheduled interest generated by the new refinance mortgage under its proposed balance, rate, and term.

Add relevant refinance costs when comparing the broader economic result rather than looking at interest alone.

Term change

The term comparison shows whether refinancing accelerates repayment, preserves roughly the current payoff horizon, or extends the debt beyond the existing maturity date.

A payment reduction created mainly by term extension should be interpreted differently from one created mainly by a rate reduction.

Cash-out proceeds

Cash-out proceeds are borrowed money secured by the property. They reduce the homeowner’s equity and increase the new mortgage balance.

The proceeds should therefore not be interpreted as a rebate or return from the lender.

Scenario 2: Refinance to the same remaining term

A homeowner has 18 years left on the current mortgage and receives a substantially lower rate quote. Instead of restarting at 30 years, the borrower asks for an 18-year or similar-term refinance.

This isolates more of the benefit from the rate reduction itself and makes lifetime-cost comparison cleaner because the debt horizon remains roughly unchanged.

Scenario 3: Refinance from 30 years remaining to 15 years

A homeowner whose income has increased may refinance into a shorter term. The monthly payment can rise even when the interest rate falls because principal must be repaid much faster.

The objective in this scenario is not monthly savings. It is accelerated amortization and lower long-term interest.

Scenario 4: The homeowner expects to sell in two years

A refinance saves $180 per month but requires $7,000 of net closing costs. The simple break-even period is almost 39 months.

If the homeowner expects to sell after 24 months, the refinance is unlikely to recover its upfront cost through monthly payment savings alone.

Scenario 5: Pay points for a lower refinance rate

A borrower can accept 6.00% with no points or pay $4,500 for a lower rate. The points option produces a smaller payment and lower future interest but increases cash required at closing.

Compare the incremental point cost with the incremental monthly and lifetime savings rather than comparing the lower rate by itself.

Scenario 6: Use lender credits to reduce refinance cash

A homeowner wants to refinance but does not want to use $6,000 of savings for closing. The lender offers credits that offset much of the upfront cost in exchange for a higher rate.

This can shorten the cash-flow break-even period while reducing the monthly savings from the refinance. Compare both versions over the expected holding period.

Scenario 7: Cash out $50,000 to consolidate debt

A homeowner owes $250,000 on the existing mortgage and refinances into a larger loan that provides $50,000 of cash to pay other debts.

The non-mortgage balances may disappear, but the household now has a larger debt secured by the home. Compare interest costs, payment changes, new mortgage term, and the risk of converting unsecured debt into home-secured debt.

Refinancing replaces the loan rather than editing the old one

A refinance does not simply change the interest-rate field on the current mortgage. The existing loan is paid off and replaced with a new mortgage.

That new loan has its own closing costs, principal balance, term, rate, payment schedule, and amortization path.

Start with the remaining mortgage, not the original mortgage

If you borrowed $400,000 ten years ago but now owe $335,000, the refinance decision begins with the current payoff obligation rather than the original $400,000 principal.

Similarly, if only 20 years remain, comparing the current mortgage with a fresh 30-year loan without explicitly showing the ten-year extension can be misleading.

Scenario 8: A homeowner says “I have a 30-year mortgage” after ten years

The mortgage may have been originated as a 30-year loan, but after ten years the relevant comparison horizon is only 20 remaining years.

A new 30-year refinance does not preserve the original term. It creates a new 30-year repayment schedule from today.

A lower rate can create genuine savings

Holding balance and remaining term approximately constant, a lower mortgage rate reduces the interest charged on the outstanding principal.

This generally lowers the required principal-and-interest payment and reduces scheduled remaining interest.

But a lower payment can come from two very different sources

Payment can fall because the interest rate is lower. It can also fall because the new term is longer.

CFPB specifically warns borrowers to distinguish how much payment reduction comes from a lower interest rate and how much comes from extending the loan term.

Scenario 9: Same rate improvement, two different new terms

A borrower reduces the rate by one percentage point. Keeping roughly the existing remaining term lowers the payment moderately and cuts interest.

Stretching the same refinance across another 30 years lowers the payment much more dramatically—but part of that cash-flow relief comes from postponing principal repayment.

Break-even asks whether you keep the refinance long enough

If a refinance costs $6,000 and saves $200 per month, a simple break-even estimate is 30 months.

If the homeowner sells or refinances again after 18 months, only $3,600 of gross payment savings has accumulated, which is less than the original $6,000 cost.

Scenario 10: The refinance breaks even—but only shortly before the homeowner moves

A homeowner expects to move in four years. The refinance has a break-even period of 42 months.

Technically the transaction reaches simple break-even before the expected sale, but only six months of net payment savings remain after recovery of the upfront cost. The homeowner should decide whether that narrow margin justifies the transaction risk and effort.

Simple break-even is useful but incomplete

Dividing closing costs by payment savings ignores differences in principal repayment, time value of money, term length, and ending balance.

Use it as a screening measure, then compare the full remaining cash flows of the old and new mortgages.

Lifetime cost is especially important when the new term is longer

A mortgage with 17 years remaining and a new 30-year refinance can create 13 additional years of scheduled payments.

Even with a lower rate, the longer debt life can produce more total interest than keeping the current loan.

Scenario 11: Save $400 per month and still pay more interest

A borrower sees a new payment that is $400 lower and assumes the refinance must save money.

If much of the reduction comes from extending the remaining term by ten years, scheduled lifetime interest can increase despite the lower monthly obligation.

A shorter refinance term can increase payment and still improve the financial result

Refinancing from a long remaining term into a 15-year mortgage can increase the required monthly payment while sharply accelerating principal repayment.

For borrowers focused on becoming mortgage-free rather than improving current cash flow, that may be the relevant comparison.

Points move cost toward the beginning of the refinance

CFPB describes discount points as upfront amounts paid in exchange for a lower interest rate.

The borrower pays more today to reduce future monthly and interest costs. Whether that works economically depends heavily on how long the new mortgage remains outstanding.

Scenario 12: Points with a five-year expected holding period

A borrower pays $3,600 in points and saves $55 per month compared with the no-point refinance.

The simple incremental break-even is about 65 months, longer than the expected five-year holding period. Under that assumption, the lower-rate option may not recover the point cost through payment savings.

Lender credits move cost toward the future

Lender credits work in the opposite direction. CFPB explains that they generally reduce closing costs upfront in exchange for a higher interest rate.

A homeowner expecting to keep the refinance only briefly may value lower upfront costs more than the homeowner planning to keep the mortgage for decades.

Compare points and credits over more than one horizon

CFPB recommends comparing the costs of point and lender-credit options over several possible timeframes, including short, long, and most likely holding periods.

This prevents a single arbitrary break-even assumption from deciding the mortgage structure.

A no-closing-cost refinance does not mean no economic cost

CFPB explains that lenders can create a no-closing-cost refinance by charging a higher rate and providing a credit, or by adding closing costs to the new mortgage balance.

In one case you pay more through the interest rate; in the other you borrow more principal. The costs have been shifted rather than eliminated.

Scenario 13: Roll $8,000 of closing costs into the new loan

A homeowner refinances a $300,000 balance but finances $8,000 of closing costs, creating a new principal balance of approximately $308,000 before other adjustments.

The homeowner preserves cash at closing but now pays mortgage interest on the financed transaction costs as part of the larger loan.

Cash-out refinance is a debt decision, not merely a refinance decision

A rate-and-term refinance primarily changes the financing terms of existing mortgage debt. Cash-out refinancing deliberately increases the mortgage balance to release part of the property equity.

The correct question therefore becomes both “Are the new mortgage terms better?” and “Should I borrow this additional amount against the home?”

Fannie Mae permits cash-out proceeds for broad uses in eligible transactions

Current Fannie Mae guidance allows cash-out proceeds in eligible transactions to be used for purposes including paying existing liens, financing closing costs and prepaids, and taking equity out of the property.

Eligibility, seasoning, LTV, credit, pricing, and documentation rules still apply.

Cash-out reduces home equity

Fannie Mae explicitly warns consumers that cash-out refinancing can reduce home equity, lengthen the time required to pay off the mortgage, and increase total interest.

The cash received is not a return of free money. It is additional debt secured by the property.

Scenario 14: $100,000 of equity does not mean $100,000 should be borrowed

A homeowner has substantial home equity and qualifies for a cash-out transaction.

Qualification establishes what may be borrowable under the program. It does not establish that using the maximum available equity is financially appropriate.

Using cash-out proceeds to pay credit cards changes the collateral risk

CFPB research found that paying other bills or debts has been a common reason borrowers use cash-out refinances.

But replacing unsecured credit-card debt with mortgage debt changes more than the interest rate. The new debt is secured by the home, so failure to sustain the mortgage payment can expose the property to foreclosure risk.

Scenario 15: 22% credit-card debt becomes 6.5% mortgage debt

At first glance, replacing high-rate revolving debt with lower-rate mortgage debt looks overwhelmingly attractive.

But if the card balance is stretched across decades, total interest can remain significant, and new card balances can later recreate the original problem while the mortgage debt remains secured by the home.

Cash-out refinancing should be compared with alternatives

Depending on the objective, alternatives can include keeping the existing first mortgage, using a home-equity loan or HELOC, selling another asset, delaying the expense, or using unsecured financing.

The correct choice depends on rate, fees, repayment horizon, collateral risk, and the value of preserving the existing mortgage terms.

A low existing mortgage rate can make cash-out refinancing especially expensive

Suppose the homeowner has a 3.25% first mortgage but current refinance rates are much higher. A cash-out refinance can reprice the entire existing balance at the new higher rate merely to access a smaller amount of equity.

In that situation, comparing only the rate on the cash received substantially understates the financing effect.

Scenario 16: Repricing $300,000 to borrow another $40,000

A homeowner with a low-rate $300,000 mortgage wants $40,000 of cash. A cash-out refinance may replace the entire $300,000 balance plus the new $40,000 with a larger current-rate mortgage.

The economic cost of obtaining the $40,000 therefore includes the effect of repricing the existing $300,000, not merely interest on the incremental cash.

Equity and LTV constrain cash-out structure

Cash-out increases the new mortgage relative to the property value and therefore raises LTV.

Mortgage-program limits, credit profile, occupancy, and other underwriting rules can restrict how much equity can actually be converted to cash.

The current property value matters more in cash-out refinancing

A refinance that merely changes rate and term is concerned mainly with replacing the existing debt. A cash-out transaction additionally depends on whether the property value supports the larger new loan.

A lower-than-expected appraisal can therefore reduce available cash-out proceeds or change loan pricing.

Refinancing can change mortgage insurance

A new refinance loan is underwritten using its own LTV and program rules. Mortgage-insurance requirements can therefore differ from those on the existing loan.

Include any new mortgage-insurance amount when comparing complete monthly payments rather than looking only at principal and interest.

Removing mortgage insurance can create part of the savings

If sufficient equity allows a new conventional refinance without mortgage insurance, monthly savings can come from both the lower interest structure and removal of the insurance payment.

Separate those effects so you understand exactly why the new total payment is lower.

Property taxes usually do not fall merely because you refinance

Refinancing changes the mortgage, not the local property-tax system. Taxes continue according to the property’s assessed value and local rules.

Use the Property Tax Calculator when the tax component itself needs analysis: Property Tax Calculator

Escrow can create temporary cash-flow noise around refinancing

A new mortgage can establish a new escrow account while the old servicer later refunds any eligible remaining escrow balance.

This timing can make the refinance appear to require more or less cash around closing even though escrow funding is not the same as a permanent lender fee.

Refinance closing costs belong in the same framework as purchase closing costs

Refinancing can involve origination charges, title services, appraisal or valuation charges, points, lender credits, prepaid amounts, and other settlement costs.

Use the Closing Costs Calculator to analyze the transaction categories: Closing Costs Calculator

APR can help compare refinance rate-and-fee combinations

If two refinance offers use similar terms but different combinations of note rate and applicable finance charges, APR can provide another standardized borrowing-cost measure.

Use the APR Calculator for that comparison: APR Calculator

Amortization shows what the term reset actually does

The refinance payment alone hides how quickly principal is being repaid. Compare the old remaining amortization schedule with the new schedule to see the balance after five, ten, or fifteen years.

Use the Amortization Calculator for the month-by-month view: Amortization Calculator

Scenario 17: Lower payment but higher balance after ten years

A homeowner refinances a 20-year remaining balance into a new 30-year loan and enjoys lower payments.

Ten years later, the new mortgage can still have more principal outstanding than the homeowner would have owed by simply keeping the original faster-amortizing schedule.

Extra payments can sometimes substitute for refinancing

A homeowner who wants faster payoff does not necessarily need a new mortgage. Additional principal on the existing loan can accelerate amortization without incurring refinance closing costs.

That strategy does not lower the contractual interest rate, but it may achieve the payoff objective without replacing the mortgage. Compare it at Extra Payment Calculator

Scenario 18: Refinance to 15 years versus keep the loan and pay extra

A borrower considering a shorter refinance term should compare the higher required new payment with the option of keeping the current mortgage and voluntarily applying the difference to principal.

The refinance may win if the lower rate produces sufficient savings. The existing loan may win if closing costs are high and payment flexibility is valuable.

Opportunity cost applies to refinance closing cash

Paying $10,000 of refinance costs today commits cash that could otherwise remain in savings, reduce other debt, or be invested.

The refinance should produce sufficient economic value to justify both the direct cost and the loss of alternative uses for that money.

Opportunity cost also applies to points

Points are particularly sensitive to holding period because the borrower pays the cost immediately while rate savings arrive gradually through future payments.

The longer the mortgage remains in place, the more time those savings have to offset the upfront cash commitment.

The best refinance can be the one you do not do

If the new rate improvement is small, costs are high, the homeowner plans to move, or the new loan materially extends repayment, keeping the existing mortgage can be financially stronger.

A calculator should always preserve “keep current mortgage” as the baseline rather than assuming refinancing is the desired outcome.

Scenario 19: Rate falls only 0.25 percentage point

A homeowner receives a refinance offer only slightly below the current rate but would need to pay several thousand dollars in costs.

The break-even period may stretch far beyond the homeowner’s expected holding period. The correct result can therefore be “do nothing.”

There is no universal rate drop that makes refinancing worthwhile

Rules such as “refinance whenever rates fall by 1%” ignore loan balance, remaining term, closing costs, new term, points, mortgage insurance, and expected holding period.

A 0.50% reduction can be highly valuable on one mortgage and uneconomic on another.

A larger mortgage balance magnifies small rate changes

A modest interest-rate reduction can produce meaningful monthly savings on a large balance because the rate applies to more principal.

On a small remaining balance, the same percentage reduction may not generate enough savings to recover refinance costs quickly.

Scenario 20: Same rate reduction, different balances

Two homeowners each reduce their mortgage rate by 0.75 percentage point. One owes $600,000 and the other owes $90,000.

The monthly savings and break-even period can differ dramatically even if refinance costs are similar.

Refinancing near the end of a mortgage deserves special scrutiny

Late in amortization, much of the remaining payment is often principal rather than interest.

Starting a new long mortgage can reverse that progress by creating a fresh schedule in which early payments again contain a substantial interest component.

Scenario 21: Eight years left versus a new 30-year mortgage

A homeowner with only eight years remaining sees a much lower payment from a new 30-year refinance.

The payment comparison is mathematically true but economically incomplete. The new loan extends an eight-year obligation into as many as 30 additional years.

Refinancing can also shorten the mortgage

Not every refinance is designed to lower the payment. Some borrowers use a lower market rate to move from a longer mortgage into a shorter term while keeping the new payment within budget.

This can increase principal repayment speed and reduce lifetime interest dramatically.

Scenario 22: Keep the same payment and shorten the term

A homeowner receives a lower refinance rate and chooses a shorter term that keeps the new payment close to the old payment.

Instead of consuming the rate reduction as monthly cash-flow savings, the borrower converts much of it into faster principal repayment.

Use DTI if the refinance is intended to improve monthly debt capacity

Reducing the required mortgage payment can lower the housing component used in debt-to-income calculations, assuming other obligations and qualifying income remain unchanged.

Model the broader ratio at DTI Ratio Calculator

A cash-out refinance can move DTI in either direction

The larger new mortgage can increase the housing payment, while using proceeds to eliminate other monthly debts can reduce non-housing obligations.

The resulting DTI depends on both sides rather than on the mortgage change alone.

Refinancing does not change whether buying originally beat renting

Refinancing changes the financing path after ownership has begun. It does not eliminate historical purchase costs, maintenance, property taxes, or prior housing-market changes.

For households still deciding whether to purchase rather than refinance, use the Rent vs. Buy Calculator

Compare the actual Loan Estimates

A serious refinance decision should eventually move from estimates to lender disclosures.

Compare rate, term, projected payment, origination charges, points, lender credits, cash to close, and other material terms across the actual offers rather than relying on advertised rates.

The final decision should survive more than one scenario

Run the refinance assuming you keep the mortgage for two years, five years, ten years, and to maturity.

Also test a same-remaining-term refinance and a longer-term refinance. If the transaction looks attractive only under one optimistic assumption, the decision is more fragile than the headline payment saving suggests.