Geographic Arbitrage for FIRE: How Moving Reduces Your FI Number

Geographic arbitrage is straightforward: if you reduce your cost of living by moving, your FI number shrinks proportionally. A household spending $100,000/year in a high-cost metro needs $2.5M–$3.3M to retire early. The same household spending $70,000/year in a lower-cost area needs $1.75M–$2.33M. That $600,000–$1,000,000 difference in the target translates directly into years off your working timeline.

What makes this worth an entire page — rather than just a footnote in the FIRE Calculator — is the planning complexity around healthcare, taxes, and what geo-arb does and doesn't affect. Moving to a state with no income tax is not the same as moving to one with a lower cost of living. Retiring abroad changes your healthcare situation fundamentally. And geographic arbitrage doesn't reduce your FI number for sequence-of-returns risk or healthcare costs at the same rate it reduces discretionary spending.

COL-Adjusted FIRE Number Calculator

Enter your current numbers, then adjust the cost-of-living slider to model what happens if you move to a lower-COL area. The calculator shows your revised FI number, the years you save off your timeline, and whether the move affects your ACA subsidy eligibility.

The math: why geographic arbitrage works

Your FI number is annual spending divided by your safe withdrawal rate. Every dollar you reduce from annual spending reduces your FI number by 1/SWR — at a 4.0% SWR, cutting $1 from spending reduces the FI number by $25. At 3.5% SWR (40-year horizon), each dollar of spending reduction is worth $28.57 in required portfolio size.

The multiplier effect on the timeline is even larger than the FI number reduction suggests. When you move to a lower-COL area before reaching your original FI number, you're simultaneously (1) reducing the target, (2) potentially still saving at a similar rate relative to a smaller target, and (3) getting closer to the new target as a percentage. A person at 60% of their original $2.5M target who adopts a 70% COL profile is now at 85.7% of their new $1.75M target — potentially just 2–3 years from the new finish line.

Domestic geographic arbitrage

Most early retirement literature focuses on international geo-arb, but domestic moves offer meaningful advantages: no immigration complexity, ACA access preserved, Medicare works normally when you reach 65, and Social Security benefits aren't affected by domestic residence.

The state income tax angle

Nine states currently have no state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.² For an early retiree drawing from a traditional IRA or 401(k), eliminating state income tax can reduce the effective tax cost of withdrawals by 4%–9%, depending on the origin state.

The impact is highest for retirees drawing pre-tax money. If you're drawing $70,000/year from a traditional IRA in California (up to 9.3% marginal state rate on retirement income) and move to Texas (0%), the annual savings is roughly $6,500 — or about $185,000 in present value over a 30-year retirement at 3% real discount rate. That alone can move your FIRE date by 1–2 years.

Roth withdrawals are not affected by state income tax since contributions were already taxed. If your retirement income is predominantly Roth-sourced, the state tax savings from moving are smaller. See Roth Conversion Ladder for how to build Roth inventory.

Lower COL destinations within the US

Cost-of-living varies by roughly 50%–70% between the most expensive metros (San Francisco Bay Area, New York, Seattle, Boston) and lower-cost regions — without leaving the country. C2ER cost-of-living index data shows the following approximate multipliers relative to the national average:¹

The dual-win destination is a no-income-tax state with below-average COL: Tennessee (Chattanooga, Nashville suburbs), Texas (smaller metros, not Austin), Florida (non-coastal cities), and Nevada (outside Las Vegas). Someone moving from the Bay Area to Chattanooga might cut spending from 180% of national average to 82% — a 55% reduction — while also eliminating California's income tax.

What COL indices miss

Published COL indices are averages. Your actual spending change depends heavily on:

• Housing: The biggest single COL driver. If you own a $1.2M Bay Area home free and clear, selling and buying a $350K home in Tennessee frees $850K in capital — which at 4% SWR converts to $34,000/year in additional sustainable spending. That capital release can be as valuable as the COL reduction itself.
• Healthcare utilization: Healthcare costs don't track COL indices well. Quality of available specialists, hospital systems, and proximity to major medical centers matters more for early retirees than the average COL index price — especially for planned procedures in a 20–30 year retirement.
• Lifestyle-specific spending: If 30% of your budget is international travel, dining out, or activities that cost the same everywhere, only the 70% that's location-sensitive responds to COL differences. Adjust the COL multiplier accordingly.

International geographic arbitrage: the larger reduction

Moving abroad can reduce COL to 30%–60% of US levels in popular destinations. The financial math — especially the FI number reduction — is more dramatic. But the planning complexity is also much higher, and healthcare is the central challenge.

ACA coverage stops at the US border

ACA marketplace plans do not cover medical care outside the United States (with very narrow emergency exceptions).³ If you retire abroad before age 65, you cannot use ACA coverage for foreign care. You'd need private international health insurance, the host country's public healthcare system (if eligible), or a combination — all of which require separate planning from the domestic healthcare-before-65 framework. See Healthcare Before 65 for the domestic ACA strategy.

Medicare does not cover care abroad

Medicare Parts A and B cover care only in the US (with very limited exceptions near the US–Canada and US–Mexico borders).⁴ Early retirees who spend extended time abroad will still pay Medicare premiums after 65 if they return, but cannot use Medicare for foreign care. Many expat retirees maintain US Medicare for stateside visits and carry international health insurance for coverage abroad.

US citizens remain subject to US worldwide taxation

Unlike most countries, the US taxes its citizens on worldwide income regardless of where they live. Investment income — dividends, capital gains, Roth conversions — is not excluded by the Foreign Earned Income Exclusion (FEIE), which applies only to earned income from employment or self-employment. The 2026 FEIE is $132,900 per person;⁵ investment income is taxed by the IRS regardless. A US citizen retired abroad living off portfolio withdrawals faces full US federal income tax on those withdrawals, just as if they were living in the US. The host country may also tax investment income — requiring attention to tax treaties to avoid double taxation.

What geographic arbitrage doesn't fix

Geo-arb reduces your FI number by reducing spending. It doesn't solve every early retirement planning challenge:

• Social Security zero-earnings years: Every year you're retired before claiming SS is a zero in your SS calculation. Moving to Chattanooga doesn't change the SS math. See Social Security Timing.
• Sequence-of-returns risk: The early years of retirement carry the highest sequence-of-returns risk. A lower FI number means a smaller portfolio — which means a bad sequence of returns hits a smaller base. Geo-arb helps by reducing withdrawal requirements, but the risk structure is the same. See Sequence of Returns Risk.
• RMD timing: Required minimum distributions begin at age 73 (born 1951–1959) or 75 (born 1960+) regardless of where you live. A large traditional IRA generates taxable RMDs that will spike your MAGI — a planning issue that a lower COL doesn't reduce. See Withdrawal Order for the Roth conversion strategy that shrinks future RMDs.
• Pre-59½ account access: Moving doesn't give you access to your IRA before 59½. You still need a taxable brokerage bridge, a Roth conversion ladder, or a 72(t) SEPP. See 72(t) SEPP Calculator and Roth Conversion Ladder.
• Lifestyle drift: A lower COL area works if the lifestyle you want is genuinely available there. If you move to a low-COL market and recreate a high-COL lifestyle (restaurants, travel, imported goods), the actual spending reduction is smaller than the COL index suggests. The calculator above uses an honest COL multiplier — if your spending is less elastic, reduce the multiplier to a more realistic figure.

How to plan the transition

For geo-arb to work as intended, it usually requires a few years of pre-retirement preparation:

1. Visit the target area for 2–4 weeks before committing. Actual daily cost of living is different from published averages. Healthcare availability, proximity to family, and lifestyle fit can only be assessed in person.
2. Model the tax-residency change. Establishing tax residency in a new state requires more than just moving. Many states (California notably) aggressively audit former residents who return regularly. If you still own property, maintain business ties, or spend significant time in your origin state, you may remain a tax resident there. Get this right before the move.
3. Account for one-time relocation costs. Moving expenses, new housing setup, and potential buy-in costs at the destination reduce the first year's benefit. Build a one-time moving budget (often $15,000–$50,000 for a full household) into your transition plan.
4. Don't lock yourself into a lower FI number before testing the lifestyle. Many FIRE practitioners do a 6–12 month trial run at the destination before fully retiring and selling the origin residence. The lower FI number doesn't help if you end up moving back.