Idaho mortgage calculator
Estimate your monthly mortgage payment for a home in Idaho, United States. Adjust the home price, down payment, rate, and term below for an instant breakdown. The calculator starts with the Idaho average effective property-tax rate of 0.5% (among the lower in the U.S.), though your county rate may differ.
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Idaho mortgage inputs
Enter your gross monthly income above to see an affordability read (based on the standard 28% front-end DTI guideline).
Loan amount: $320,000
Default rate (6.55%, 30-year fixed) is the United States national average as of 2026-07-16 — edit it to match your own quote.
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Frequently asked questions
How is my monthly mortgage payment calculated?
Your total monthly payment is principal and interest (calculated with the standard fixed-rate amortization formula) plus 1/12 of your annual property tax, 1/12 of your annual home insurance, and any monthly HOA/strata/service charge. Adjust any of the inputs above to see how each one changes your total.
What down payment do I actually need?
20% avoids private mortgage insurance (PMI) on a conventional loan, but many buyers put down less — some loan programs allow as little as 3–3.5%. A smaller down payment means a larger loan and a higher monthly payment, which you can see directly by changing the down payment field above.
What does the affordability verdict mean?
It uses the standard 28/36 front-end debt-to-income guideline that most lenders reference: a payment at or under 28% of your gross monthly income is considered comfortable, 28–36% is a stretch worth budgeting carefully for, and over 36% is tight by most lenders’ standards. Enter your gross monthly income to see your own number.
Is property tax the same everywhere in Idaho?
No — property tax rates vary by county and even by city within Idaho. The calculator starts from Idaho's statewide average effective rate of 0.5%, so check your local assessor's site for your exact county rate and adjust the field to match.
Does this calculator store or send my information anywhere?
No. Every number you enter is calculated directly in your browser — nothing is saved, logged, or sent to a server. There’s no account, no email required, and no lead form.