Mortgage Calculator with Extra Payments — PITI, Taxes, Insurance & Amortization
A mortgage calculator with extra payments estimates your full monthly housing payment — principal, interest, property tax, homeowners insurance, and PMI when your down payment is under 20% — then models how added principal shortens your payoff timeline. On a $400,000 home with 20% down at 6.5% for 30 years, principal and interest run about $2,028 per month; with $400/month tax and $100/month insurance, total PITI is roughly $2,528. Enter an extra monthly payment to see interest saved on the built-in amortization schedule. For dedicated early-payoff or biweekly-payment scenarios, use the Mortgage Payoff Calculator and Biweekly Payment Calculator in the related tools below.
Loan Details
$70,000 · LTV 80%
Buyer Profile
Extra Payment
Optional principal-only payment used to estimate payoff speed and interest savings.
Monthly Payment
$1,770 Principal & Interest · $321 Property Taxes · $125 Other
Methodology and limitations
Last reviewed:
Methodology
Uses standard principal-and-interest mortgage math, then models housing-cost inputs such as tax, insurance, PMI, and extra-payment scenarios where available.
Limitations
Planning estimate only. Actual approval, escrow, PMI, fees, taxes, insurance, and closing disclosures depend on lender, property, borrower profile, and local rules.
Official sources
Mortgage Amortization Schedule
This calculator estimates a monthly mortgage payment and shows how the loan amortizes over time. Each payment is split between interest and principal, and the remaining balance falls until the loan is paid off.
For a general principal-and-interest schedule with start date, CSV export, and PDF export controls, use the loan amortization table calculator .
Quick answer
A mortgage amortization schedule shows how the principal-and-interest part of a home loan is paid down. It does not reduce property tax, home insurance, PMI, or HOA dues; those costs can affect the monthly housing payment, but they do not pay down the loan balance.
Amortization vs. total housing payment
Amortization explains the loan itself. A full monthly mortgage payment can include PITI: principal, interest, taxes, and insurance. PMI, HOA dues, and other costs may raise the payment, but they are outside the loan amortization formula.
What the mortgage amortization schedule shows
- Estimated monthly principal and interest payment
- Interest paid in each period
- Principal applied to the loan balance
- Remaining balance after each payment
- Estimated total interest over the life of the loan
How extra mortgage payments change the schedule
An extra monthly payment is treated as additional principal. That can reduce total interest and move the payoff date earlier because future interest is calculated on a smaller balance.
Example: why early mortgage payments are interest-heavy
On a fixed-rate mortgage, monthly interest is calculated from the outstanding balance. Early in the loan, that balance is high, so more of the payment goes to interest. As the balance falls, less interest accrues and more of each payment reduces principal.
Amortization formula used
The principal-and-interest portion uses the standard fixed-payment formula:
Payment = P x r(1 + r)^n / ((1 + r)^n - 1)
In the formula, P is the loan amount, r is the monthly interest rate, and n is the total number of payments. Taxes, insurance, and PMI are estimated separately so the calculator can show a fuller monthly housing payment.
Frequently Asked Questions
What does this mortgage calculator include?
This mortgage calculator with taxes and insurance estimates your full monthly housing payment using the standard amortization formula for principal and interest, then adds property tax, homeowners insurance, and PMI when your down payment is under 20%. You also get a mortgage amortization schedule showing how each payment splits between interest and principal, plus an extra-payment scenario to see interest saved and months shaved off your loan.
When does PMI apply on a mortgage?
Private Mortgage Insurance (PMI) is typically required when your loan-to-value ratio exceeds 80%, meaning your down payment is less than 20% of the home price. PMI usually costs 0.2% to 1.5% of the loan amount annually and is added to your monthly payment until you reach 20% equity. Some borrowers cancel PMI after appraisal or pay down principal faster; this calculator models PMI when your down payment triggers it.
Is a 30-year or 15-year mortgage better?
A 15-year mortgage usually carries a lower interest rate and builds equity faster, but monthly payments are higher because you repay the loan in half the time. A 30-year mortgage keeps payments lower and preserves cash flow, though you pay significantly more total interest over the life of the loan. Use this calculator to compare both terms with the same home price, down payment, taxes, and insurance to see the monthly payment and total interest difference.
What interest rate should I use in a mortgage calculator?
Use the rate from a lender pre-approval or loan estimate for the most accurate monthly payment. If you do not have one yet, the current national average for a 30-year fixed mortgage is a reasonable starting point for planning. Remember that your actual rate depends on credit score, loan type, points, and market conditions, so treat the result as an estimate until you have an official quote.
Does this mortgage calculator include closing costs?
No. Closing costs — typically 2% to 5% of the loan amount — are one-time expenses paid at settlement and are not included in the monthly PITI estimate here. This tool focuses on recurring monthly costs: principal, interest, property tax, insurance, and PMI. For closing-cost planning, review your Loan Estimate from the lender or use a dedicated closing-cost guide alongside this calculator.
What is a mortgage amortization schedule?
A mortgage amortization schedule is a table that shows how each monthly payment is split between interest and principal and how the remaining loan balance declines over time. Early in a 30-year loan, most of each payment goes to interest; later payments apply more to principal. This calculator builds a full amortization table you can review to see total interest paid, payoff date, and how extra principal payments change the schedule.
How do extra mortgage payments affect amortization?
Extra mortgage payments reduce principal sooner, so future interest is calculated on a smaller balance. Even modest monthly add-ons can cut thousands in total interest and move your payoff date earlier without changing your required payment amount. Enter an extra principal payment in the calculator to compare base versus accelerated schedules and see estimated interest saved and months removed from the loan term.
Is this a mortgage calculator with extra payments?
Yes. Enter an optional extra monthly principal payment to see how it changes your amortization schedule, total interest, and payoff date alongside PITI. For lump-sum or larger payoff planning, use the Mortgage Payoff Calculator. For biweekly half-payments that add one extra payment per year, use the Biweekly Payment Calculator — both are linked in the related tools on this page.