# Montana Mortgage Calculator

> Monthly mortgage payment in Montana including its average property tax rate of 0.61%, insurance and PMI, at today's average rate.

URL: https://paycheck-math.com/us/mortgage-calculator/montana/  
Breadcrumbs: Home > United States > Mortgage calculator > Montana  
Language: en-US  
Rates checked: 2026-10-25  

Monthly payment, total interest and the balance left each year for any home price, down payment, rate and term. The starting rate of 7.32% is the Freddie Mac 30-year average for Oct 22, 2026. Property tax uses Montana's average effective rate of 0.61%.

## Result with default inputs

Inputs: price=400000, down=80000, rate=7.32, years=30, property_tax_rate=0.61, insurance=1800, hoa=0, pmi_rate=0.5, compounding=monthly

**Monthly payment: $2,551.51**

- Loan amount: $320,000.00
- Total interest: $471,344.07

| Line | Item | Amount |
| --- | --- | --- |
| 1 | Principal and interest | $2,198.18 |
| 2 | Property tax | $203.33 |
| 3 | Home insurance | $150.00 |
| 4 | **Monthly payment** | $2,551.51 |


To compute other inputs, call the JSON API: `https://paycheck-math.com/api/v1/calculate?path=%2Fus%2Fmortgage-calculator%2Fmontana%2F&price=400000&down=80000&rate=7.32` or open the page URL with the same query parameters.

## Payments by rate and term

_Monthly principal and interest on a $320,000 loan_

| Rate | 15 years | 20 years | 25 years | 30 years |
| --- | --- | --- | --- | --- |
| 6.32% | $2,756 | $2,352 | $2,125 | $1,985 |
| 6.82% | $2,844 | $2,447 | $2,225 | $2,090 |
| 7.32% | $2,934 | $2,543 | $2,327 | $2,198 |
| 7.82% | $3,025 | $2,641 | $2,432 | $2,308 |
| 8.32% | $3,117 | $2,741 | $2,538 | $2,420 |

## How it's calculated

The principal-and-interest payment uses the standard annuity formula:

M = P × r / (1 − (1 + r)^−n)

P is the loan amount, r the monthly rate and n the number of monthly payments. Property tax, home insurance, PMI (when the down payment is under 20%) and HOA fees are added on top.

Official source: [Freddie Mac PMMS](https://www.freddiemac.com/pmms). Rates checked on Oct 25, 2026.

## Questions people ask

### How much does each 1% of interest rate add?

On $320,000 over 30 years, the payment at 7.32% is $2,198 and at 8.32% it is $2,420 a month.

### Should I choose a 15 or 30-year term?

A shorter term has a higher monthly payment but far less total interest. The table above shows both.

### When can I stop paying PMI?

Lenders must cancel PMI automatically when the balance reaches 78% of the original home value, and you can ask to remove it at 80%.

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Estimates for information only, not tax, legal or financial advice. Check with an adviser or the official tax authority.