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New Report Fall 2026 Housing Affordability Report: every state is less affordable than in late August as average 30-year mortgage rates passed 7%. Read the report

Firth, ID Housing Affordability Index

Firth, Idaho has an MBR Housing Affordability Index score of 112.4 (More Affordable Than Average) as of October 30, 2026, ranking 93rd most affordable of 187 scored Idaho cities, compared with 96.7 statewide and 97.4 nationally. On a median-priced $235,400 home with 20% down, the Idaho average 30-year fixed rate of 7.24% means a monthly principal and interest payment of about $1,283, or 27% of the city’s $56,250 median household income.

The MBR Housing Affordability Index (MBR-HAI) for Firth is updated every night from live Idaho mortgage rates and U.S. Census Bureau income, home value and housing cost data for the city. A score of 100 equals the national average; higher scores mean homeownership is more affordable.

Firth MBR-HAI 112.4 More Affordable Than Average
Rank in Idaho 93 of 187 1 = most affordable
Idaho 96.7 Statewide score
National 97.4 100 = baseline
Avg 30-yr rate 7.24% Idaho lenders
Median home value $235,400 U.S. Census Bureau

Firth is 15.7 points above the Idaho score. Scores as of October 30, 2026. See the Idaho index

View Firth Mortgage Rates

See What You Can Afford in Firth, Idaho

Use this Firth, Idaho home affordability calculator to see how much house you can afford at today’s Idaho average 30-year mortgage rate of 7.24%. A household earning the Firth median income of $56,250, with no other debts and $47,000 down, can afford a home of about $212,402, compared with a median home value of $235,400. Buying the median priced home with 20% down takes a household income of about $63,800 once property tax and insurance are counted.

Firth median (Census)
Car, student loan, card minimums
Under 20% adds PMI
Idaho average, 30-year fixed
Firth median bill (Census)
Estimate; use your quote
You can afford a home up to
$212,402
Below the Firth median home value of $235,400
Loan amount$165,402
Principal & interest$1,127/mo
Property tax$97/mo
Home insurance$89/mo
PMI$0/mo
Total monthly payment$1,313/mo
Compare Firth Mortgage Rates

How much house can you afford in Firth?

Most lenders use two limits. Your housing payment, including principal, interest, property tax, homeowners insurance and any PMI, should stay under about 28% of your gross monthly income, and all of your monthly debt payments together should stay under about 36%. The calculator takes whichever limit is lower, then works backward from that payment to the most expensive home it covers at the current rate.

In Firth, property taxes run about 0.55% of a home’s value each year, based on the Census median tax bill, which counts against the same monthly budget as the mortgage. Each quarter point move in mortgage rates changes the price you can afford by roughly $3,585 for a median income household. A larger down payment, paying down other debts, or a lower rate from a local lender all raise your budget.

What It Takes to Buy in Firth

$1,283/mo
Principal & Interest
Median home, 20% down, 7.24%
$55,000
Income Needed
To keep principal and interest at 28% of income
$56,250
Median Household Income
Idaho: $77,800
4.2x
Price-to-Income Ratio
Idaho: 5.4x
$925/mo
Median Owner Costs
Mortgage, taxes, insurance, utilities
$1,304/yr
Median Property Tax
0.55% of median value
17.9%
Owner Cost Burden
Owners spending 30%+ of income on housing
52.6%
Renter Cost Burden
Renters spending 30%+ of income on rent

Source: U.S. Census Bureau American Community Survey 5-Year Estimates (2024) for Firth, Idaho. The rate is the Idaho average 30-year fixed rate from MonitorBankRates, since lenders publish rates by state.

Cite the Firth Score

“MonitorBankRates (MBR) Housing Affordability Index, MonitorBankRates.com, October 30, 2026. Firth, Idaho score: 112.4 (More Affordable Than Average), ranked 93 of 187 Idaho cities. monitorbankrates.com/housing-affordability-index/idaho/firth”