UntilFireUntilFireEstimated FIRE portfolio for the city’s spending baseline
Data reviewed September 17, 2026. Annual spending range: $44,600–$49,600. Sources & assumptions
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Reference city · $4,000/month baseline
City-center locations are approximate. These are city-level planning estimates, not neighborhood prices. All comparisons use USD and the same 25× guideline.
The US spending baseline combines Census median gross rent with a $34,000 national non-housing allowance. The range reflects renter medians and Census uncertainty; it is not a full local household budget.
The target is annual spending × 25. Retirement length, taxes, healthcare and investment outcomes can change the amount you need.
Census recent-mover rent table · Census all-renter fallback table
Using the 4% rule — the most widely used FIRE guideline — retiring in Idaho Falls, ID requires a portfolio of $1,200,000. This assumes you'll spend $48,000 per year and withdraw 4% of your portfolio annually, which historical data suggests can sustain a 30+ year retirement.
Idaho Falls, ID sits near the middle of UntilFire's US city range. That makes it useful for testing whether the real lever is spending discipline, tax efficiency, or simply earning more.
Idaho Falls, ID residents face Idaho — ~5.80% effective, so pre-tax contributions and a realistic take-home estimate matter. FIRE math breaks when people plan from gross salary instead of the amount they can actually invest.
The biggest levers are still your savings rate and your timeline. Saving 20% of take-home instead of 10% can cut years off the journey, and starting earlier lowers the amount your portfolio has to do later.
Updated September 17, 2026. All amounts are annual US dollars. Housing uses the US Census Bureau's American Community Survey median gross rent for recent movers, with the all-renter median used when the recent-mover figure is unavailable. Non-housing spending uses a $34,000national annual baseline. Together they produce the $48,000 planning estimate above.
The displayed range reflects renter medians and Census margins of error, so it is a starting point rather than a household budget. Replace it with your own spending in the calculator. The FIRE target applies the common 25× guideline; it does not guarantee that a portfolio will last.
Not everyone wants the same retirement. Here is how the main FIRE variants translate to Idaho Falls, ID's $48,000/year cost-of-living baseline, so you can target the lifestyle you actually want.
Invest this by age 30 and growth alone (≈6.9% real) can reach full FIRE by 65 — no further contributions needed.
Portfolio covers roughly half of Idaho Falls, ID's $48,000 annual spending; part-time work bridges the rest.
A leaner $33,600/year lifestyle in Idaho Falls, ID (about 70% of the baseline), at the 25× rule.
The standard 25× target on Idaho Falls, ID's $48,000 annual baseline.
A more comfortable $72,000/year lifestyle in Idaho Falls, ID (about 1.5× the baseline).
Idaho Falls, ID ranks by annual spending baseline among UntilFire's US cities, which helps explain whether your target is being pushed mostly by local costs or by your own spending choices.
The current UntilFire median US city baseline is $53,900/year. Every $1,000 of annual spending changes the 25× target by $25,000.
Nearest higher baseline: Rochester, NY at $48,100/year.
Nearest lower baseline: St. Louis, MO at $47,900/year.
The quickest next step after a city baseline is pressure-testing your withdrawal-rate assumptions for Idaho Falls, ID.
Open FIRE Number CalculatorThe honest answer to the most common retirement question — how to calculate your number, what variables actually move it, and how to stress-test your target.
Read the guideA simple baseline for Idaho Falls, ID is $1,200,000, which comes from multiplying the local annual spending estimate of $48,000 by 25. That is a starting point, not a final answer: your housing, taxes, and personal spending rhythm still matter.
Idaho Falls, ID sits about $5,900 below the current UntilFire median US city baseline of $53,900 per year, which can make the target easier to reach if income holds up.
Idaho Falls, ID uses Idaho — ~5.80% effective, so pre-tax contributions and realistic take-home assumptions matter. Taxes do not change the 25x rule directly, but they do change how quickly you can fund it.
Lean FIRE in Idaho Falls, ID — a leaner lifestyle at about 70% of the local baseline — works out to roughly $840,000. Fat FIRE, a more comfortable lifestyle at about 1.5× the baseline, is closer to $1,800,000. Standard (full) FIRE sits at $1,200,000, and Coast FIRE — the amount that can grow into full FIRE on its own by age 65 if invested by age 30 — is about $116,135.