Idaho Falls is structurally unlike most US metros — anchored by the Idaho National Laboratory (INL), the Department of Energy's primary nuclear research facility, with an unusually high concentration of PhD scientists and engineers for a metro of this size. The 2.55% cap rate at a $405,000 median price keeps the 0.35% rent-to-price ratio close to functional. Population growth at 1.8%/yr is steady, helped by both INL expansion and broader Mountain West in-migration.
Employment is anchored by Idaho National Laboratory (the DOE's lead national lab for nuclear energy research — operated by Battelle Energy Alliance, with ~5K+ scientists, engineers, and support staff; INL is one of the larger US national-lab employment concentrations and is genuinely growing as US nuclear-energy investment ramps up), the broader Eastern Idaho Regional Medical Center (EIRMC) and Mountain View Hospital, the broader agricultural economy serving the Snake River Plain (one of the most productive irrigated agricultural regions in the country — potatoes, sugar beets, dairy, wheat), the broader Bonneville County government, Melaleuca (a wellness products company headquartered here), and a meaningful tourism economy tied to Yellowstone access (~85 miles to West Yellowstone). The tenant base skews scientific and professional — unusually high-credit for a metro of this size. Submarkets stratify cleanly: the historic downtown / North Yellowstone Highway corridor and the Riverbend area are walkable urban with strong appreciation; the broader Ammon east of town is premium suburban-school; the broader Bonneville County (Iona, Ucon) extends with newer construction; the West and South Idaho Falls zones offer deeper-value workforce inventory; the broader Madison County (Rexburg, BYU-Idaho 30 miles north) extends the broader Upper Snake River Plain economy.
Idaho property tax at 0.64% is moderate, with a homeowner's exemption that doesn't apply to non-occupant rentals (model the non-owner-occupied basis). Idaho state income tax is a flat ~5.8%. Insurance is reasonable. The structural advantages: INL is genuinely growing federal-research infrastructure (the Versatile Test Reactor program, the broader nuclear-energy R&D investment under recent administrations) — durable white-collar employment; agricultural production is durable; cost basis is materially below Boise. The structural risks: any major federal nuclear-research program shift would ripple to the metro; agricultural water access has tightened with continued drought cycles affecting Snake River Plain irrigation. For investors who want federal-research durability with a high-credit tenant base at low cost basis, Idaho Falls is one of the most underrated national-lab markets in the country.
Market data powered by Zillow Home Value Index (ZHVI) and Zillow Observed Rent Index (ZORI) · Updated Feb 2026
Idaho Falls's 0.3% rent-to-price ratio is well below the 1% rule. At median prices of $405,000, the $1,410/mo rent produces only $861/mo in NOI. Investors here need to target below-median properties or pursue value-add strategies to make the numbers work.
At current rates, a 20% down conventional loan ($81K at 7%) would result in approximately $-1,294/mo cash flow — negative at median prices. Larger down payments, seller financing, or buying 15–25% below median are strategies to turn the numbers positive.
The 23.9x gross rent multiplier and 4.5% vacancy rate position Idaho Falls as a growth-dependent market. With annual appreciation at 2.5%, total returns (cash flow + equity growth) run approximately 5.0% before financing leverage.
All figures below are computed from Idaho Falls's real market medians. Use them as a baseline; override with property-specific numbers in the calculators.
At 0.64% effective rate on the $405,000 median price, the annual tax bill is $2,592 — that's below national average (-40% vs the national average of ~1.06%). Verify the actual assessed value before purchase; sale-triggered reassessments can push the bill higher than the seller's current statement.
If Idaho Falls continues appreciating at 2.5%/yr while rents grow at a conservative 3%/yr, cap rate holds roughly steady as price growth outpaces rent. Year-by-year projection at the median:
| Year | Est. Price | Est. Rent/Mo | Cap Rate |
|---|---|---|---|
| Today | $405K | $1,410 | 2.5% |
| Year 1 | $415K | $1,452 | 2.6% |
| Year 2 | $426K | $1,496 | 2.6% |
| Year 3 | $436K | $1,541 | 2.6% |
| Year 4 | $447K | $1,587 | 2.6% |
| Year 5 | $458K | $1,635 | 2.6% |
Same median-priced Idaho Falls property — different capital structures. All-cash maximizes cap rate. Leverage trades cash flow for higher cash-on-cash return when the spread between cap rate and borrowing cost is positive.
| Scenario | Cash Invested | Monthly Cash Flow | Annual CF | Cash-on-Cash |
|---|---|---|---|---|
| All cash | $405K | $861 | $10,327 | 2.5% |
| 20% down conventional @ 7% | $93K | $-1,294 | $-15,529 | -16.7% |
| 25% down DSCR @ 8.5% | $117K | $-1,475 | $-17,703 | -15.1% |
Properties don't always trade at the median. Lower-priced units typically offer higher cap rates but harder operations; higher-priced properties tend to compress cap rates while attracting better tenants. All-cash assumptions below:
| Tier | Price | Rent/Mo | NOI/Yr | Cap Rate | Monthly CF |
|---|---|---|---|---|---|
| Below median (~75% price) | $304K | $1,199 | $8,279 | 2.7% | $690 |
| At median | $405K | $1,410 | $9,239 | 2.3% | $770 |
| Above median (~125% price) | $506K | $1,621 | $10,199 | 2.0% | $850 |
Cap rate is just one piece. Real estate returns come from four sources: cash flow, appreciation, principal paydown, and tax benefits. Assuming 20% down conventional financing at 7% and a 5-year hold at Idaho Falls's historical appreciation rate of 2.5%:
On a $81K down payment, that's a -0.2% total ROI over 5 years (not annualized). Tax benefits from depreciation are additional and depend on your personal tax bracket.
Automated checks against the underlying data — surface only the risks that actually apply to Idaho Falls, not generic boilerplate:
Pre-filled with Idaho Falls medians. Adjust to match a specific property.
Factor in financing to see your actual return on invested capital in Idaho Falls.
Idaho Falls, ID has a population of 67,000 and has been growing at 1.8% annually — above the national average, suggesting steady demand pressure on housing. The median home price of $405,000 paired with median rents of $1,410/mo produces an estimated cap rate of 2.55%.
Property taxes at 0.64% are well below the national average of ~1.1%, providing a meaningful cash flow advantage many investors overlook. The vacancy rate of 4.5% is impressively low, indicating tight rental supply and strong tenant demand — favorable for landlords.
At a price-to-income ratio of 7.7x, homes cost about 7.7 times the local median income of $52,400. This elevated ratio means homeownership is stretched, supporting rental demand but limiting buyer pools. Home values have appreciated at roughly 2.5% annually. Steady appreciation means total returns will be primarily cash flow-driven — the more sustainable model for long-term wealth building.
Bottom line: At current median prices, Idaho Falls is challenging for pure cash flow investing. Consider BRRRR strategies with below-market purchases, or look at neighboring metros with stronger price-to-rent ratios.