How much do you need to retire in Idaho Falls, ID? Based on a local cost of living of $42,000/year, your FIRE target is $1,050,000.
Using the 4% rule — the most widely used FIRE guideline — retiring in Idaho Falls, ID requires a portfolio of $1,050,000. This assumes you'll spend $42,000 per year and withdraw 4% of your portfolio annually, which historical data suggests can sustain a 30+ year retirement.
Idaho Falls, ID lands in the lower-cost end of UntilFire's US city range, which can make FIRE more reachable if income remains stable and lifestyle creep stays under control.
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.
Not everyone wants the same retirement. Here is how the main FIRE variants translate to Idaho Falls, ID's $42,000/year cost-of-living baseline, so you can target the lifestyle you actually want.
Invest this by age 30 and growth alone (≈7% real) can reach full FIRE by 65 — no further contributions needed.
Portfolio covers roughly half of Idaho Falls, ID's $42,000 annual spending; part-time work bridges the rest.
A leaner $29,400/year lifestyle in Idaho Falls, ID (about 70% of the baseline), at the 25× rule.
The standard 25× target on Idaho Falls, ID's $42,000 annual baseline.
A more comfortable $63,000/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 $50,000/year. Every $1,000 of annual spending changes the 25× target by $25,000.
Nearest higher baseline: Spokane, WA at $44,000/year.
Nearest lower baseline: Birmingham, AL at $40,000/year.
The quickest next step after a city baseline is pressure-testing your withdrawal-rate assumptions for Idaho Falls, ID.
Open FIRE Number CalculatorTwo different paths to financial independence, and how to tell which one fits your current season of life.
Read the guideA simple baseline for Idaho Falls, ID is $1,050,000, which comes from multiplying the local annual spending estimate of $42,000 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 $8,000 below the current UntilFire median US city baseline of $50,000 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 $735,000. Fat FIRE, a more comfortable lifestyle at about 1.5× the baseline, is closer to $1,575,000. Standard (full) FIRE sits at $1,050,000, and Coast FIRE — the amount that can grow into full FIRE on its own by age 65 if invested by age 30 — is about $98,346.
Track your spending, model your investments, and see exactly when you can retire in Idaho Falls, ID.
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