Mortgage Amortization Calculator — See Every Payment Breakdown Free 2026
You’ve been paying $2,000 a month for three years. You check your balance and it’s barely moved. That’s not a bug — that’s amortization. In the early years of a 30-year mortgage, most of your payment goes to interest, not your loan balance. This calculator shows you exactly where every dollar goes, payment by payment, year by year — and what happens when you start paying extra.
Mortgage Amortization Calculator
See exact payoff date, tipping point, extra payment savings — everything competitors hide
What Is Mortgage Amortization?
Mortgage amortization is the process of paying off your home loan through fixed monthly payments over a set term. Each payment covers two things: interest on the remaining balance, and a portion of the principal. The split between the two changes every single month — but your payment stays the same.
The Front-Loading Problem — Why Your Balance Moves So Slowly
This is the part nobody explains clearly enough. On a $320,000 loan at 6.5% over 30 years, your monthly P&I payment is $2,023. Here is what that first payment actually covers:
- Interest: $1,733
- Principal: $290
You paid $2,023 and your loan balance dropped by $290. That is not a mistake. That is how amortization works. The interest is calculated on your remaining balance — and in month one, that balance is $320,000. As you pay down the loan, the interest portion shrinks and the principal portion grows. But it happens slowly.
By month 60 (year 5), you’ve made $121,380 in payments. Your balance is still approximately $298,000. You’ve paid down roughly $22,000 in principal — and $99,000 in interest.
This is why people feel like they’re running in place for the first decade of a mortgage. They are — relative to the total debt. The math is working exactly as designed. But knowing this changes how you think about extra payments.
The Interest Tipping Point — When Does Principal Finally Overtake Interest?
On a standard 30-year fixed mortgage, the tipping point — the payment where your principal portion finally exceeds your interest portion — comes around payment 253, which is roughly year 21.
On a 15-year mortgage, the tipping point arrives around payment 42 — year 3 and a half.
This single fact explains why the 15-year mortgage builds equity so much faster. And it explains why extra payments made in years 1–10 of a 30-year loan have a dramatically larger impact than the same payments made in years 20–25.
The amortization schedule in this calculator shows you exactly where your tipping point falls based on your specific loan — not a generic estimate.
How to Use This Amortization Calculator
Loan Amount and Interest Rate
Enter your loan amount — this is the amount you borrowed, not the home price. If you put 20% down on a $400,000 home, your loan amount is $320,000. Enter your annual interest rate as a percentage. For 2026, the national average 30-year fixed rate is approximately 6.3–6.5%.
Loan Term and Start Date
Select your loan term in years — 30, 20, 15, or 10. Then enter your loan start date. This is what converts your schedule from an abstract table into real calendar months. Instead of seeing “Payment 253,” you see “October 2047.” Instead of “payment 360,” you see the actual month your mortgage ends.
The payoff date updates in real time as you adjust the term and rate. Use it to compare scenarios concretely — not just as numbers, but as actual years of your life.
Extra Payments — Monthly and Lump Sum
Monthly Extra Payment
Enter any additional amount you plan to add to each monthly payment. The calculator shows two outputs immediately:
- Months saved off your loan term
- Total interest saved over the life of the loan
On a $320,000 loan at 6.5% over 30 years, here is what different extra payment amounts actually do:
| Extra/Month | Interest Saved | Months Saved | New Payoff |
|---|---|---|---|
| $0 | — | — | Apr 2056 |
| $50 | $28,400 | 28 months | Dec 2053 |
| $100 | $52,600 | 52 months | Dec 2051 |
| $200 | $91,800 | 88 months | Dec 2048 |
| $500 | $163,200 | 147 months | Jan 2044 |
Paying $100 extra per month — less than most people spend on streaming services combined — saves $52,600 in interest and pays off the mortgage over four years early.
Lump Sum Payment
Enter a one-time extra payment and the date you plan to make it. The calculator recalculates the entire schedule from that point forward, showing the new payoff date and total interest saved.
A $10,000 lump sum payment made in year 3 of a $320,000 loan at 6.5% saves approximately $38,000 in interest and cuts 22 months off the term — because that $10,000 eliminates every dollar of interest that would have compounded on it for the remaining 27 years.
Lump Sum vs Monthly Extra — Which Saves More?
Both strategies work. The key difference is timing and flexibility. A lump sum payment front-loaded early in the loan term has a larger mathematical impact than the same total amount spread over years, because it removes more principal from the high-interest early period.
However, monthly extra payments are more sustainable for most households. The best approach depends on your cash flow. If you receive a bonus, tax refund, or windfall — use lump sum. For consistent extra payments — use monthly.
Reading Your Amortization Schedule
Monthly Breakdown — Principal vs Interest Per Payment
The full schedule shows every payment for the life of your loan with four columns:
- Payment number and date — exactly when each payment falls
- Principal — how much reduces your balance
- Interest — how much goes to the lender
- Remaining balance — what you still owe after that payment
Watch the principal column grow and the interest column shrink as you scroll through the schedule. In year one, your principal column is small. By year 25, it dominates. This visual shift is why amortization schedules are so useful — they make abstract math concrete and show you the actual cost of your loan year by year.
Annual Summary — Equity Built Each Year
Below the monthly schedule, the annual summary shows what happens to your loan each year as a single row:
| Year | Interest Paid | Principal Paid | Remaining Balance | Equity % |
|---|---|---|---|---|
| 2026 | $20,720 | $3,556 | $316,444 | 1.1% |
| 2030 | $19,888 | $4,388 | $296,428 | 7.4% |
| 2035 | $18,616 | $5,660 | $265,592 | 17.0% |
| 2040 | $16,922 | $7,354 | $227,988 | 28.8% |
| 2045 | $14,676 | $9,600 | $181,178 | 43.4% |
| 2050 | $11,692 | $12,584 | $122,484 | 61.7% |
This table answers the question most borrowers ask when selling or refinancing: “How much equity do I actually have?” Your equity is your home’s current value minus your remaining balance. The remaining balance column gives you that number for any year in the future.
Total Interest Paid — The Number That Shocks Most Borrowers
On a $320,000 loan at 6.5% over 30 years, the total interest paid is $408,142. You borrowed $320,000. You repay $728,142.
This figure appears prominently in the results — not to discourage homeownership, but because understanding it is what drives every smart mortgage decision: choosing a shorter term, making extra payments, refinancing when rates drop significantly. Use our Mortgage Refinance Calculator to see whether current rates make refinancing worthwhile for your situation.
Balloon Payment — How It Works
What Is a Balloon Payment?
A balloon mortgage has a short term — typically 5, 7, or 10 years — but its monthly payment is calculated as if it were a 30-year loan. This gives you lower monthly payments during the term. At the end of the term, the remaining balance comes due as a single large payment — the balloon payment.
Example: $320,000 loan at 6.5%, payments based on 30-year amortization, balloon due after 7 years.
- Monthly payment: $2,023 (same as a 30-year loan)
- Payments made over 7 years: 84 × $2,023 = $169,932
- Remaining balance after 7 years: $295,512 ← this is the balloon payment
You’ve paid nearly $170,000 and still owe $295,512. The balloon payment format keeps monthly costs low but defers the real debt to a deadline.
Who Uses Balloon Mortgages?
Balloon mortgages are common in commercial real estate, where investors plan to sell or refinance the property before the balloon comes due. In residential real estate, they were more common before 2008. Today they are relatively rare for primary homes but still appear in:
- Commercial property purchases
- Land loans and construction financing
- Fix-and-flip investments where the property will be sold before the balloon date
- Bridge loans between buying a new home and selling an existing one
The Risk — What Happens If You Can’t Pay?
The balloon payment plan assumes one of three things will happen by the end of the term: you sell the property, you refinance into a new loan, or you have the cash to pay the balance.
If none of these happen — if your credit has deteriorated, property values have dropped, or interest rates have risen significantly — you may not be able to refinance on acceptable terms. In that scenario, the lender can foreclose. This is the primary risk of balloon mortgages and why they require careful planning before signing.
The amortization schedule for a balloon loan shows every regular monthly payment plus the large final balloon payment in the last row — so you can see exactly what you’re committing to before signing.
Extra Payments — The Most Powerful Feature
What $100 Extra Per Month Actually Does
The impact of extra payments is non-linear. Every extra dollar you pay in the early years eliminates the compounding interest that dollar would have generated for the remaining term. The earlier the payment, the larger the impact.
Months Saved vs Interest Saved — Real Numbers
On a $320,000 loan at 6.5%, 30 years:
| Scenario | Extra/Month | Interest Saved | Payoff Accelerated |
|---|---|---|---|
| Standard | $0 | — | — |
| Coffee money | $50 | $28,400 | 2 years, 4 months |
| One dinner out | $100 | $52,600 | 4 years, 4 months |
| Small sacrifice | $200 | $91,800 | 7 years, 4 months |
| Significant effort | $500 | $163,200 | 12 years, 3 months |
The $200/month column is the one most financial advisors point to. For a household earning $120,000, $200/month is 2% of gross income — a real commitment but not a hardship. In return, you pay off your mortgage over 7 years early and save $91,800.
The Best Time to Make Extra Payments
Why Early Payments Matter More Than Later Ones
The same $1,000 extra payment produces dramatically different results depending on when you make it:
- Paid in month 12 (year 1): Saves approximately $3,800 in interest over the loan life
- Paid in month 120 (year 10): Saves approximately $2,100 in interest
- Paid in month 240 (year 20): Saves approximately $800 in interest
This is not a trick — it’s the mathematics of compound interest working in reverse. An extra payment removes principal from the loan, and every dollar of principal removed in year 1 eliminates 29 more years of interest accumulation on that dollar.
This is why making extra payments as early as possible — even small amounts — has an outsized impact. Use our Mortgage Payoff Calculator to model any payoff scenario with your actual loan balance and rate.
30-Year vs 15-Year Amortization — Side by Side
Year-by-Year Equity Comparison
The equity difference between a 30-year and 15-year mortgage is dramatic even in the early years, because the 15-year loan has a lower rate and a faster amortization curve.
On a $320,000 loan: 30-year at 6.5% vs 15-year at 5.9%:
| Year | 30yr Remaining Balance | 15yr Remaining Balance | Equity Difference |
|---|---|---|---|
| 5 | $298,000 | $243,000 | $55,000 |
| 10 | $270,000 | $163,000 | $107,000 |
| 15 | $232,000 | $0 (paid off) | $232,000 |
By year 15, the 15-year borrower owns their home outright. The 30-year borrower still owes $232,000 and has 15 more years of payments.
Total Cost Difference
| 30-Year at 6.5% | 15-Year at 5.9% | |
|---|---|---|
| Monthly P&I | $2,023 | $2,680 |
| Monthly difference | — | +$657 |
| Total interest | $408,142 | $162,400 |
| Interest saved | — | $245,742 |
| Payoff year | 2056 | 2041 |
The 15-year costs $657 more per month but saves $245,742 in total interest. Whether that trade-off makes sense depends on your income stability, other financial goals, and how long you plan to stay in the home. For a full comparison including affordability check, use our Mortgage Calculator and run both scenarios.
Mortgage Amortization Formula — How It’s Calculated
The Formula Explained Simply
Every fixed-rate mortgage uses the standard amortization formula:
M = P × [r(1+r)^n] / [(1+r)^n − 1]
M = Monthly payment (P&I)
P = Principal (loan amount)
r = Monthly interest rate (annual rate ÷ 12)
n = Total payments (years × 12)
Once M is calculated, each month’s interest is: Remaining Balance × Monthly Rate
And that month’s principal is: M − Interest
The remaining balance for the next month is: Previous Balance − Principal Paid
Repeat 360 times for a 30-year loan. That is the complete amortization schedule.
Why Your Payment Stays Fixed But the Split Changes
The monthly payment M never changes on a fixed-rate loan. But because interest is recalculated each month on the current balance — and the balance is always falling — the interest portion shrinks every single month by a tiny amount. And because the total payment is fixed, the principal portion grows by exactly the same amount the interest shrank.
In month 1: principal = $290, interest = $1,733 In month 360: principal = $2,012, interest = $11
The payment is always $2,023. The split has completely reversed.
When to Use Your Amortization Schedule
Before Refinancing
Pull up your current amortization schedule and find where you are in the loan. If you are in year 8 of a 30-year mortgage, you’ve already paid most of the front-loaded interest for those 8 years. Refinancing into a new 30-year loan resets the amortization clock — you start paying front-loaded interest again on a lower balance.
This is why refinancing late in a loan term is often not worth it, even if you secure a lower rate. The interest savings from the rate drop may be smaller than the additional front-loaded interest from restarting the schedule. Use our Mortgage Refinance Calculator to run the actual break-even analysis before deciding.
Before Selling Your Home
Your amortization schedule tells you exactly what your remaining balance will be at any future date. Subtract that from your expected sale price to estimate your equity after paying off the mortgage. The HELOC Calculator uses a similar equity calculation if you’re considering borrowing against your home before selling.
Before Making Extra Payments
Check whether your mortgage has a prepayment penalty before making extra payments. Some loan agreements — particularly older ones and certain commercial loans — include penalties for paying off principal faster than the scheduled amortization. The penalty is typically 2–5% of the prepaid amount. Check your loan documents or call your servicer before making any large lump sum payment.
Frequently Asked Questions
Why is so much of my payment going to interest?
Because interest is calculated on your remaining loan balance each month. In the early years, the balance is large — close to the original loan amount — so the interest charge is large. As you pay down the principal, the monthly interest charge gradually shrinks. This front-loading of interest is mathematically inevitable in a fixed-rate amortizing loan. It is not a lender trick — it is how amortization works.
When does my principal payment exceed my interest payment?
On a 30-year fixed mortgage, the tipping point — where more of each payment goes to principal than interest — occurs around year 21, approximately payment 252–255. On a 15-year mortgage, it happens around year 3–4, approximately payment 42–48. The exact payment number depends on your loan amount and interest rate. The schedule in this calculator shows the tipping point for your specific loan.
How much can I save with extra payments?
On a $320,000 loan at 6.5% over 30 years, paying an extra $100/month saves approximately $52,600 in interest and pays off the loan 4 years and 4 months early. The earlier you start extra payments, the larger the impact. Use the extra payment fields above to model your exact scenario.
What is negative amortization?
Negative amortization occurs when your monthly payment is less than the interest due for that month. The unpaid interest gets added to your loan balance — so your balance actually increases instead of decreasing. This happens with certain adjustable-rate mortgages, interest-only loans during the interest-only period, and some graduated payment mortgages. Standard fixed-rate mortgages do not have negative amortization.
Does making an extra payment reduce my monthly payment or my loan term?
Neither automatically. Making an extra principal payment reduces your loan balance and shortens the total number of payments remaining — but your required monthly payment stays the same. You will simply finish paying earlier. Some lenders allow you to officially “recast” your mortgage after a large lump sum payment, which recalculates a new lower monthly payment based on the reduced balance. Our Mortgage Calculator shows the standard scenario; contact your lender about recasting if you want a lower monthly payment.
What is a balloon payment in a mortgage?
A balloon payment is a large lump sum due at the end of a short-term loan that was structured on a longer amortization schedule. For example, a 7-year balloon mortgage makes monthly payments calculated on a 30-year schedule — keeping payments low — but the remaining balance (typically 90%+ of the original loan) comes due in full at the end of year 7. Balloon mortgages are common in commercial real estate and bridge financing.
Can I get a printable amortization schedule?
Yes. Click the print button in the schedule view to open a printer-friendly version of your full amortization table. The schedule includes every payment, split between principal and interest, with the remaining balance after each payment and the annual summary rows.
How is amortization different from a simple interest loan?
In a standard amortizing mortgage, interest is calculated monthly on the remaining balance, and payments are fixed. In a simple interest loan, interest accrues daily on the balance — meaning paying early in the month reduces the interest charge for that month. Simple interest loans are more common in personal loans and some auto loans. Most residential mortgages are amortized, not simple interest. The distinction matters if you’re deciding whether to pay at the beginning or end of the month — for amortizing loans, the timing within the month does not affect your interest charge.
Related Calculators
Amortization is one piece of the mortgage picture. For the full monthly payment including property tax, insurance, PMI, and HOA fees, use our Mortgage Calculator — it shows the real total cost of ownership, not just principal and interest.
If your goal is to pay off your mortgage early and you want to model any combination of extra payments, our Mortgage Payoff Calculator shows month-by-month savings for any payoff scenario.
For homeowners considering refinancing — either to a lower rate or a shorter term — our Mortgage Refinance Calculator calculates the break-even point and total savings before you commit to closing costs.
If you’re buying and need to check what you can actually afford based on income and debts, start with the Affordability Calculator. For equity-based borrowing on an existing home, the HELOC Calculator estimates your available credit line based on your current balance and home value.
Data Source
The amortization schedule in this calculator uses the standard fixed-rate mortgage amortization formula as codified under the Truth in Lending Act (TILA, 15 USC § 1638) and implemented in Regulation Z (12 CFR Part 1026), which requires lenders to disclose the full payment schedule on all closed-end mortgage loans: M = P × [r(1+r)^n] ÷ [(1+r)^n − 1]
Where: P = principal, r = monthly interest rate (annual rate ÷ 12), n = total number of payments.
Interest allocation per payment follows the actuarial method — interest is calculated on the outstanding principal balance at the start of each period, with the remainder of each payment applied to principal reduction. This is the method mandated by the Consumer Financial Protection Bureau (CFPB) for all US residential mortgages.
Extra payment calculations reduce the outstanding principal on the date the additional payment is applied, recalculating the remaining amortization schedule from that point forward. Total interest saved and months eliminated are computed from the revised schedule against the original baseline.
2026 average mortgage rate reference data is sourced from Freddie Mac’s Primary Mortgage Market Survey (PMMS), published weekly. The 30-year fixed rate benchmark used in examples reflects the PMMS average for the week of April 24, 2026. Results are estimates. Actual amortization schedules may vary slightly by lender due to payment rounding conventions, first payment date, and whether the lender uses a 360-day or 365-day interest year