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Extra Payment Calculator: Pay Off Your Mortgage Sooner
Use this extra payment calculator to see exactly how much time and interest a recurring extra principal payment or a one-time lump sum saves on your current mortgage.
Extra payments applied to principal reduce the balance interest is charged on, so every later month accrues less interest and the loan pays off earlier. Enter your balance, rate, and months remaining, then add a monthly extra amount or a lump sum to see the new payoff date and the total interest saved.
- ✓Extra principal reduces the balance immediately, so all future interest is calculated on a smaller number.
- ✓Small recurring amounts often shorten a 30-year loan by years, not months.
- ✓A one-time lump sum early in the loan saves far more than the same amount paid late.
- ✓Tell your servicer in writing to apply extra funds to principal.
- ✓Check your note for any prepayment penalty before making large extra payments.
What this means for you: Confirm with your servicer that extra funds are applied to principal, not held as a prepaid future payment.
Written by
Simply Approved Mortgages Team
Licensed Loan Officers · NMLS# 2620881
Get your personalized scenario summary
Complete the short request and a Simply Approved Mortgages Loan Officer sends back a written summary built from your own numbers: estimated payment breakdown, estimated cash to close, the loan structures that fit your file, and what documentation the file will need.
- Estimated monthly payment with taxes and insurance
- Estimated cash to close for your scenario
- Loan options your profile may fit
- Document checklist for your file
Takes about 3 minutes · Summary shown on screen and emailed to you
Illustration only, generated from the information you enter. Not a rate quote, lock, loan estimate, pre-qualification, offer, approval, or commitment to lend. Figures are subject to credit, income, asset and property review and full lender underwriting; binding numbers appear on your Loan Estimate.
Scenario summary
- Purchase price entered
- $412,000
- Down payment entered
- $20,600
- Estimated loan amount
- $391,400
- Estimated cash to close
- $14,300
- Programs reviewed
- 4
Sample layout with example figures — your own numbers replace these. Simply Approved Mortgages LLC · NMLS #2620881 · Equal Housing Opportunity.
Extra Payment Calculator
What extra principal payments actually do
Add a recurring extra amount, a one-time lump sum, or both, and see the change in payoff date and total interest. Principal and interest only. Educational only — not a quote, lock, offer, or commitment to lend.
Illustrative results
Assumes extra amounts are applied to principal in the month paid and that your note has no prepayment penalty. Confirm how your servicer applies extra funds. Figures are illustrative; binding figures appear on your loan documents.
Next steps
Emailing your Extra payment calculator scenario opens our secure request form so a Simply Approved Mortgages Loan Officer can review those numbers. Estimates are illustrative and are not a quote, lock, offer, or commitment to lend.
Assumptions, methodology, and limitations
Extra payments are applied to principal each month, then the loan is re-amortized to show the reduced payoff time and interest paid over the life of the loan.
It assumes the servicer applies extra funds to principal immediately, and excludes escrow, mortgage insurance, and any prepayment handling differences.
Results are illustrative estimates only and are not a quote, lock, offer, or commitment to lend. No rate, APR, or program approval is implied. Binding figures appear on your Loan Estimate. Eligibility, terms, and availability vary by borrower, property, lender, loan program, and state.
Run your scenario with a loan officer
Share your numbers and a Simply Approved Mortgages Loan Officer sends back an estimated payment, estimated cash to close, and the structures that fit your file. Educational only — not a quote, lock, offer, or commitment to lend.
Why extra principal works so well
Mortgage interest accrues on the outstanding balance. Any dollar applied directly to principal permanently removes that dollar from every future interest calculation for the remaining life of the loan. That compounding effect is why a modest recurring extra amount can remove years from a 30-year term.
Recurring extra payments versus a lump sum
Both work, but timing matters. A lump sum applied in year two eliminates interest on that amount for the next twenty-eight years. The same lump sum applied in year twenty-two only eliminates interest for eight. If you have a choice about when to prepay, earlier is materially more efficient.
Biweekly payments explained honestly
Biweekly plans work because twenty-six half-payments equal thirteen monthly payments per year, meaning one extra full payment annually. There is nothing magic in the biweekly schedule itself, and some third-party biweekly services charge enrollment or transaction fees for something you can do yourself by adding one-twelfth of a payment to principal each month. Model both in the calculator and pick the cheaper mechanism.
Want these numbers built around your file?
A short request is all it takes to get a written scenario summary back from a Simply Approved Mortgages Loan Officer. Binding figures appear on your Loan Estimate.
Make sure the money lands where you think it does
Servicers do not all treat extra funds the same way. Some apply the surplus to principal automatically, some hold it as unapplied funds until a full payment accumulates, and some treat it as prepaying next month's bill, which does not reduce interest at all. Submit extra amounts as a separate principal-only payment where the servicer supports it, keep the confirmation, and verify the principal balance on the next statement.
When prepaying is not the best use of the money
Prepaying a mortgage is a guaranteed return equal to your note rate, which is attractive, but it is also illiquid. Money put into principal is not available for an emergency without a new loan. Before prepaying aggressively, most households are better served by funding an emergency reserve, clearing higher-rate consumer debt, and capturing any employer retirement match. Consider your own situation and consult your financial or tax advisor. Simply Approved Mortgages does not provide tax or investment advice.
Prepayment penalties
Most conforming and government residential loans made today do not carry a prepayment penalty, and federal rules under the ability-to-repay framework sharply restrict them on covered transactions. Some Non-QM and investor loans do include them. Check your note and any addenda before making a large lump-sum payment or planning an early payoff.
This is an educational tool. Results are estimates based on the values you enter and are not a quote, lock, offer, or commitment to lend.
What you can do with this loan
Test how an extra $100, $250, or $500 per month changes your payoff date.
Model a bonus or tax refund applied as a lump sum to principal.
Compare a biweekly plan against simply adding one-twelfth of a payment monthly.
Plan to reach 80% loan-to-value sooner for mortgage insurance cancellation.
Decide whether to prepay or keep liquidity for reserves.
Pros & cons — honest tradeoffs
Pros — Pros & cons
- +Every extra dollar to principal reduces all future interest on the loan.
- +No refinance, no closing costs, and no change to your rate.
- +You control the amount and can stop at any time.
- +Reaching 80% loan-to-value earlier can end conventional mortgage insurance sooner.
- +Shortens the payoff without committing to a higher required payment.
Cons / watch-outs — Pros & cons
- −Money applied to principal is illiquid until you sell or borrow against the home.
- −Some servicers misapply extra funds unless you instruct them clearly.
- −A few loan types carry prepayment penalties.
- −Prepaying may be a lower priority than higher-rate debt or emergency reserves.
- −Your required monthly payment does not fall unless the loan is recast.
Compare loan officer compensation on your mortgage quote
Loan officer compensation is part of the cost of a mortgage. On eligible residential loans, Simply Approved Mortgages generally uses 1.5% lender-paid compensation. Enter the compensation shown on another lender's Loan Estimate to see the difference in dollars.
Compensation difference on this illustration: $3,750.
How lower compensation can help you
When less compensation is built into pricing, there can be room for a lower interest rate, which may lower your monthly payment.
Depending on the rate you choose, pricing can sometimes include a lender credit toward third-party closing costs, so you may bring less cash to closing.
A lower rate means a lower monthly payment, which can lower your debt-to-income ratio and may help you qualify for more home on the same income.
As a mortgage broker we compare pricing from wholesale lenders instead of offering a single bank’s retail pricing.
Tip: On page 2 of your Loan Estimate, look at Section A, "Origination Charges." If the lender pays the loan officer, that compensation usually does not appear there as its own line; it is built into the interest rate. That is why comparing the rate and any lender credits side by side matters.
Already have a Loan Estimate from another bank or broker? Share it with a Simply Approved Mortgages Loan Officer, who will compare the rate, fees and credits side by side with options we can arrange. No cost to request a review.
Illustration only — not a quote, lock, offer, or commitment to lend; binding figures appear on your Loan Estimate. Lender-paid compensation is paid by the lender, not directly by you, and is part of the loan's pricing, so the loan is not free of costs. A lower compensation figure does not by itself guarantee a lower rate or lower closing costs; individual results vary by credit, loan type, property and market conditions. Residential lending in FL and CO only. Simply Approved Mortgages LLC · NMLS #2620881 · Equal Housing Opportunity.
Worked example
How this loan actually works — a full example
A homeowner has a $350,000 balance at a 6.50% note rate with 360 months remaining. She decides to add $250 per month to principal and also applies a $10,000 bonus as a one-time principal payment.
Inputs
- Current balance
- $350,000
- Note rate
- 6.50%
- Months remaining
- 360
- Recurring extra principal
- $250/month
- One-time lump sum
- $10,000
Calculation
- 1Scheduled monthly principal & interestCalculated from balance, rate, and term
- 2Effect of the lump sumBalance drops immediately, so all later interest is smaller
- 3Effect of the recurring extraEach month retires more principal than scheduled
- 4Result shown by the toolNew payoff date, months saved, and total interest saved
Illustrative only — not a quote, lock, offer, or commitment to lend. Binding figures appear on your Loan Estimate.
Purchase market update
What buyers should know this month
30-Yr Fixed · national avg
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15-Yr Fixed · national avg
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2026 buying power
Conforming baseline: $832,750
FHA floor / ceiling: $541,287 – $1,249,125
Time saved
See the new payoff date against the scheduled one.
Interest saved
Total interest avoided over the life of the loan.
Lump sum modeling
Add a one-time principal payment alongside monthly extras.
Cost and payment tools
Run your payment, affordability, closing cost and refinance numbers
Monthly payment, affordability, closing costs, refinance break-even and early payoff, all on one screen. This page is not written for one state, so property tax, insurance and transfer or recording charges start at neutral placeholder assumptions rather than published averages — Transfer, documentary-stamp and recording charges are set by your state and county — enter your own figure, or open the state page for a sourced seed. Insurance and tax assumptions vary widely by state, county and property, so replace these starting values with quotes for your address. Every figure is an illustrative estimate, not a quote, lock, offer, approval, or commitment to lend.
Your inputs
Estimated result
- Down payment
- $20,000
- Loan amount
- $380,000
- Principal & interest
- $2,402
- Property tax
- $333/mo
- Homeowners insurance
- $167/mo
- Estimated total monthly
- $2,902/mo
Reference sources: Tax Foundation — property taxes paid as a percentage of owner-occupied housing value, NAIC — Homeowners Insurance Report, CFPB — Understanding your Loan Estimate.
Assumptions, methodology, and limitations
Principal and interest use the standard amortization formula on the loan amount you enter. This page does not target a single state, so the property tax and insurance fields start at neutral placeholder assumptions rather than published averages — replace them with figures for your own address, or open the matching state page for sourced seeds. Closing costs apply your state's transfer / documentary-stamp practice (0.00% of price used as the buyer-side seed) plus typical title, recording, appraisal, credit and prepaid escrow lines. Refinance break-even divides your entered costs by the monthly payment difference. Early payoff runs a month-by-month amortization with your extra principal.
These tools do not include mortgage insurance, funding or guarantee fees, HOA special assessments, flood or windstorm premiums, seller credits, lender credits, discount points, or county and municipal charges specific to your parcel. Statewide averages will not match any individual property. Figures are estimates only.
Illustrative only. Binding figures appear on your Loan Estimate, and terms vary by borrower, property, lender, program, and state.
Turn these estimates into real numbers
Send your scenario to a Simply Approved Mortgages Loan Officer and get a written summary back, or compare where rates sit today. Educational only — not a quote, lock, offer, approval, or commitment to lend.
Extra payment calculator FAQs
Answers to the most common extra payment calculator questions, written by licensed loan officers.
Ask SAM anything about mortgages
SAM is the Simply Approved Mortgages AI assistant. It answers general questions using the reviewed guides published on this site and links you to the primary government source. It is educational only — it does not quote a rate, payment, APR, approval or commitment to lend. A Simply Approved Mortgages Loan Officer reviews every scenario before any terms are confirmed.
Hi, I'm SAM — an AI assistant for Simply Approved Mortgages. I can explain loan programs, closing costs, DTI, down payments and which calculator or guide to use. I'm not a licensed loan officer, and nothing here is a quote, approval or commitment to lend.
Ask Sam AI provides general educational information only. It is an automated assistant, may be incomplete or out of date, and does not provide legal, tax or financial advice. Nothing it produces is a rate quote, APR, pre-approval, offer or commitment to lend. Never share a Social Security number, ITIN, date of birth, account number or password in chat. Simply Approved Mortgages LLC (NMLS #2620881) arranges residential mortgage loans in Florida and Colorado. Eligibility, terms, conditions and availability vary by borrower, property, lender, loan program and state, and all loans are subject to lender underwriting and approval. Equal Housing Opportunity.
Trusted government resources
These independent government resources can help you research mortgage programs, rates, and your rights before you apply.
CFPB
CFPB — Paying Off Your Mortgage Faster
CFPB
CFPB — Mortgage Servicing Rules and Payment Application
CFPB
CFPB — Owning a Home
Simply Approved Mortgages is not affiliated with HUD, the CFPB, the FTC, the VA, or any other government agency. Links are provided for your independent verification.
How this page connects
Where this fits in the mortgage calculators library
This page sits inside our Mortgage calculators coverage.
What most readers open next
- The affordability worksheetBecause to work back from income rather than price.
- What PITI includesBecause the escrow half of the payment surprises most buyers.
- Closing cost detailBecause the calculator payment excludes what you bring to closing.
- Getting pre-approvedBecause to turn an estimate into a documented number.
Explore the full guide
Keep reading — the rest of the buying playbook
Each of these is a deep-dive on one piece of the purchase mortgage process. Bookmark whichever you need next.
Guide
Amortization Calculator
See the full year-by-year schedule.
Read the guide →Guide
Mortgage Calculator Hub
Full payment estimate with taxes and insurance.
Read the guide →Guide
How to Remove PMI
Use extra principal to reach 80% sooner.
Read the guide →Guide
Refinance Calculator
Compare prepaying against refinancing.
Read the guide →Guide
15-Year Mortgage Rates
The structured version of paying off early.
Read the guide →Guide
Mortgage Glossary
Definitions for recast, escrow, and more.
Read the guide →Internal library
Related mortgage guides across our library
Follow the next relevant guide for your scenario.
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Complete this short request and a Simply Approved Mortgages Loan Officer will personally review your scenario. The form only asks what your program actually needs. Submitting it is not an application for credit and is not a commitment to lend.
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Pick one — the form adapts.Pick a loan type
Programs for buying a home.Conventional loan — 3–20% down · 620+ FICO
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Simplify Your Mortgage Journey with These Resources
Talk To A Loan Officer
A Simply Approved Mortgages Loan Officer will personally connect with you to walk through your options.
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Plain-language articles to help you understand the home loan process, save on closing costs, and make confident decisions.
7 things every first-time homebuyer should know before applying
From credit prep to down payment assistance, here’s how to walk into your first mortgage application with confidence.
Using your VA loan benefit: a step-by-step guide
Eligibility, the Certificate of Eligibility, funding fees, and how to maximize zero-down purchasing power.
Where your closing costs actually go (and where you can save)
A line-by-line breakdown of the Loan Estimate and the fees that are negotiable versus fixed.
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Equal Housing Opportunity
Broker identification. Simply Approved Mortgages LLC is a mortgage broker and is not a direct lender. We arrange residential mortgage loans with third-party wholesale lenders and do not make the lender's final credit decision or fund the loan. We arrange residential mortgage loans in Florida and Colorado. Business-purpose mortgage products may be arranged in additional states only where permitted by applicable law and pursuant to applicable licensing requirements or exemptions.
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