Mortgage Payment Calculator With Taxes, Insurance, and PMI

A mortgage payment calculator with taxes, insurance, and PMI gives a more complete monthly housing estimate than principal and interest alone. Start with the loan amount, interest rate, and term. Then add property taxes, homeowners insurance, private mortgage insurance, and—when relevant—HOA dues.

The result is still an estimate. Your lender, location, insurance policy, loan type, credit profile, and closing documents determine the actual payment. The point of a transparent calculator is to make each assumption visible so you can change one input at a time.

What a mortgage payment includes

People often use “mortgage payment” to mean only principal and interest. A monthly housing payment can also include:

Component	What it represents
Principal	The part of the payment that reduces the loan balance
Interest	The borrowing cost under the selected rate and balance
Property tax	An estimate of the annual tax bill divided across months
Homeowners insurance	An estimate of the annual premium divided across months
PMI	Mortgage insurance that may apply to a conventional loan with a smaller down payment
HOA dues	A separate monthly association charge when the property has one

This is often called a PITI-style estimate: principal, interest, taxes, and insurance. PMI and HOA dues may sit alongside those costs. Redfin’s mortgage calculator and NerdWallet’s mortgage calculator both expose additional housing-cost inputs because principal and interest alone can understate the monthly amount.

How to use a mortgage payment calculator with taxes, insurance, and PMI

Enter the scenario in this order:

Home price: the purchase price used in the scenario.
Down payment: the cash paid at the start, entered as a dollar amount or percentage according to the calculator’s input.
Interest rate: the annual rate used for the fixed-rate payment formula.
Loan term: the number of years over which the modeled loan is paid.
Property tax: an annual dollar estimate or the selected percentage assumption.
Homeowners insurance: an annual premium estimate.
PMI rate or premium: the mortgage-insurance assumption when the loan is below the selected threshold.
HOA dues: a monthly amount if the property has an association fee.

Then inspect the breakdown, not just the headline monthly payment. A useful result should show how much comes from principal and interest and how much comes from the extra housing-cost assumptions.

Open the Equity Replay mortgage payment calculator to change these inputs in your browser. The result updates locally and is intended for scenario exploration, not a loan offer or underwriting decision.

The principal-and-interest formula

For a standard fixed-rate loan, the monthly principal-and-interest payment can be represented as:

M = P × [r(1 + r)^n] ÷ [(1 + r)^n − 1]

Where:

M is the monthly principal-and-interest payment;
P is the loan principal;
r is the monthly interest rate, or annual rate divided by 12; and
n is the number of monthly payments, or years multiplied by 12.

The formula does not automatically include property tax, homeowners insurance, PMI, HOA dues, closing costs, maintenance, or utilities. Those amounts need separate assumptions.

Why taxes and insurance change the answer

Property tax and homeowners insurance are not fixed percentages of the loan balance. Taxes depend on the property’s assessed value, local rules, exemptions, and reassessment practices. Insurance depends on the property, coverage, deductible, insurer, claims history, and local risks.

That means a calculator should label them as estimates and let you replace the defaults. If you already have an annual tax estimate or insurance quote, use those figures instead of relying on a generic percentage.

The same home price can produce different monthly costs in different locations. Comparing two scenarios is more useful when the tax and insurance assumptions are shown next to the loan assumptions rather than hidden inside one number.

How PMI changes a mortgage payment

Private mortgage insurance is commonly associated with conventional loans that begin with less than 20% down, although the exact rules and premiums depend on the loan and lender. A simple calculator may estimate monthly PMI by applying an annual PMI rate to the original loan amount and dividing by 12.

That estimate is useful for a first comparison, but it is not a lender’s exact PMI schedule. The premium may depend on loan-to-value ratio, credit history, loan type, occupancy, and other underwriting factors. It may also change or end under rules that are not represented in a simple scenario.

Use the private mortgage insurance calculator to isolate the PMI assumption, then return to the full mortgage payment calculator to see how it affects the monthly total.

Example: separate the pieces of a payment

Imagine a scenario with these illustrative inputs:

Home price: $400,000
Down payment: $60,000
Loan amount: $340,000
Fixed interest rate: 6.5%
Term: 30 years
Annual property tax estimate: $4,800
Annual homeowners insurance estimate: $1,800
Annual PMI estimate: 0.5% of the original loan amount

The calculator should keep the components distinct. Principal and interest answer the loan-payment question. Taxes and insurance answer the estimated escrow-cost question. PMI answers the mortgage-insurance question. Adding them together produces an illustrative monthly housing total, but not a guarantee of what a servicer will charge.

Changing the down payment can affect more than the loan principal. It may change the loan-to-value ratio and therefore the PMI assumption. Changing the interest rate affects the principal-and-interest formula but does not automatically change your tax or insurance estimates.

Mortgage payment versus mortgage affordability

A payment calculator asks, “What could this selected loan cost each month?” An affordability calculator asks, “What home-price scenario fits the income, debt, and housing assumptions I entered?” Those are related but different questions.

Use the mortgage affordability calculator when you want to start with income and existing debt. Use the payment calculator when you already have a home price, down payment, rate, or term that you want to inspect.

If you are comparing the cost of owning with renting, continue with the rent vs. buy calculator. If you already have a mortgage and are weighing a new rate, the mortgage refinance calculator can help you inspect the modeled break-even point.

Neither result decides what you should borrow. A real housing decision also depends on income stability, cash reserves, taxes, insurance availability, maintenance, closing costs, and the terms of a specific offer.

How to make the estimate more useful

Run a small sensitivity table rather than trusting one scenario:

Change one input	What to inspect
Rate increases	How much principal and interest changes
Down payment increases	Loan amount and possible PMI change
Tax estimate changes	Monthly housing-cost change without changing the loan
Insurance estimate changes	The effect of coverage cost on the total
Term changes	Monthly payment versus total modeled interest
HOA dues added	The difference between loan payment and full housing cost

Save or share the scenario link only after checking that the assumptions are clear. A result is easier to review when someone else can see the same inputs instead of only a final dollar amount.

What a mortgage calculator cannot tell you

An online estimate cannot determine:

whether you qualify for a loan;
the rate a lender will offer you;
the exact property-tax assessment or insurance premium;
the final PMI schedule or cancellation date;
closing costs, prepaid items, maintenance, utilities, or repairs; or
whether a home is affordable for your circumstances.

For those questions, use the calculator as an educational starting point and confirm the details with qualified professionals and the documents for the specific property and loan.

The short version

A mortgage payment calculator with taxes, insurance, and PMI is more useful than a principal-and-interest-only estimate because it shows the major pieces of a monthly housing scenario. Keep the loan math separate from the tax, insurance, PMI, and HOA assumptions, and change one input at a time.

Equity Replay’s calculators are illustrative, client-side tools. They do not provide lending, tax, insurance, legal, or financial advice, and they do not create a loan offer or approval.