"How much can I actually afford?" is usually the very first question a first-time buyer asks — and it's often asked quietly, because there's a worry underneath it: what if the answer is "nothing"? Here's the honest math for the Treasure Valley, using August 2026 rate and price data, so you can see where you stand before you ever talk to anyone.
How do lenders decide how much I can borrow?
Lenders look at your debt-to-income ratio, or DTI — your total monthly debt payments divided by your gross (pre-tax) monthly income. Under FHA and conventional underwriting guidelines, most loan programs want your total DTI, including the new house payment, to land under about 43%, and the traditional comfort zone is 36% or below. Car payments, student loans, and credit card minimums all count against that ceiling; groceries, utilities, and phone bills don't.
A common assumption is that salary alone determines what you can afford. It doesn't — two buyers earning the same salary can qualify for very different loan amounts, because a $450 monthly car payment can reduce what you qualify for by tens of thousands of dollars in purchase price. The lender's DTI ceiling is also a maximum the underwriting guidelines allow, not a spending recommendation — more on that distinction below.
What does that look like at $70,000, $80,000, and $90,000?
Here are honest estimates for Treasure Valley buyers, assuming minimal other debt, a 3.5% down payment on an FHA loan (a government-backed loan program designed for buyers with smaller down payments), and the roughly 6.3% average FHA rate reported by Bankrate on August 10, 2026. Each range runs from a conservative budget (about 36% DTI) to the upper end most lenders will approve (about 43%):
- $70,000 household income: roughly $270,000–$330,000 purchase price, with an all-in payment around $2,100–$2,500 per month.
- $80,000 household income: roughly $315,000–$385,000, with a payment around $2,400–$2,850 per month.
- $90,000 household income: roughly $360,000–$440,000, with a payment around $2,700–$3,200 per month.
Notice that "household income" matters here. If you're buying with a spouse or partner, both incomes count. A couple earning $55,000 and $45,000 is an $100,000 household in the lender's eyes, even though neither salary alone sounds like "homebuyer money."
What will my monthly payment actually include?
The number most people picture as "the payment" is usually just principal and interest — the loan itself. Your real monthly cost in Idaho includes more:
- Principal and interest: the loan payment itself. At an FHA rate near 6.3% (Bankrate, August 10, 2026), figure roughly $640 per month for every $100,000 borrowed.
- Property taxes: the state's homeowner's exemption helps — per the Idaho State Tax Commission, it removes 50% of your home's value (up to $125,000) from taxation once the home is your primary residence. You apply once through your county assessor's office — the Ada County Assessor or Canyon County Assessor for most Treasure Valley buyers — and it stays in place while you live there.
- Homeowners insurance: typically in the neighborhood of $100–$150 per month for a Treasure Valley starter home, depending on the property.
- Mortgage insurance: if you put less than 20% down, you'll pay a monthly insurance premium. We've covered what PMI is and how to avoid it in detail — the short version is that it's manageable, plannable, and not a reason to wait years while saving 20%.
- HOA dues, if any: homeowners association dues (a monthly fee some neighborhoods and most condos charge for shared amenities and maintenance) can add $30–$300+ per month, and lenders count them in your DTI.
As a concrete example: a $350,000 home bought with 3.5% down at the roughly 6.3% FHA rate available in August 2026 runs roughly $2,700 per month once you add taxes, insurance, and mortgage insurance together.
What can you actually buy for that in the Treasure Valley right now?
Based on first-half 2026 local market reporting, the median sale price ran about $582,000 in Ada County and about $436,000 in Canyon County. By city: Boise came in around $570,000, Meridian around $568,000, Nampa around $425,000, and Caldwell around $420,000. (These figures come from aggregated local market reporting rather than a direct MLS pull — worth a quick cross-check against current Intermountain MLS data before this post goes live.)
Reading those numbers against the ranges above tells you something honest: on a $70,000–$90,000 income, the median Boise or Meridian single-family home is a stretch. But that's not the end of the story — it just points you toward where the real inventory is for a first purchase:
- Canyon County: Nampa and Caldwell medians sit right inside the $80,000–$90,000 income range, and plenty of homes sell below the median.
- Townhomes and condos: across Ada County, attached homes regularly list well under detached single-family prices, which can put Boise and Meridian addresses back in reach.
- Smaller and older homes: the median is the middle, not the floor. Solid homes sell below it in every Treasure Valley city.
A first home doesn't have to be a forever home. Many of the buyers Mark works with buy their first place in Nampa, Kuna, or Caldwell, build equity for a few years, and move up later with real money behind them.
What's the difference between what I can borrow and what I should spend?
A common assumption is that a lender's maximum approval is the number you should actually spend. It isn't — a lender will approve you up to 43% DTI or higher because that's what underwriting guidelines allow, not because it's comfortable to live at. At the top of your approval, a job change, a new baby, or a furnace repair has nowhere to land in your budget.
A useful gut-check: if your total house payment stays near 30% of your gross monthly income, you'll have room left for savings, repairs, and an actual life. On $80,000, that's about $2,000 per month — which maps to roughly a $300,000–$320,000 purchase at current rates. Buying below your maximum isn't settling; it's the thing that makes year two of homeownership feel as good as day one.
How can I safely afford more house?
If the ranges above land short of what you're hoping for, there are levers — none of them gimmicks:
- Pay down monthly debts first. Eliminating a $400 car payment raises your buying power far more than a small raise does, because it frees DTI directly.
- Improve your credit score. A higher score earns a lower rate, and a lower rate buys more house for the same payment. Here's what credit score you need to buy your first home in Idaho and how to move it.
- Look at down payment help. Idaho Housing and Finance Association programs can reduce your rate or assist with the down payment — see our guide to first-time home buyer programs available in Idaho in 2026.
- Get pre-approved before you shop. A pre-approval (a lender's written estimate of what you qualify for, based on verified income and credit) replaces guesswork with a real number — and it's free.
If you want to see everything that happens between "I wonder if I can afford this" and getting the keys, the full journey is laid out in plain language in our 10-step buying process, with the detailed version at how the MHC buying process works step by step. And you can always meet the whole My Home Connection team behind the program.