Financial Independence Calculator: Your FI Number, Years to FI, and Coast FIRE

Reaching $1 million is a milestone — but is it financial independence? For most households with professional-level spending ($80K–$180K/year), $1M is a starting point, not an exit. This page gives you three tools: your FI number at different safety levels, how many more years at your savings rate, and your Coast FIRE threshold — plus the specific tax planning moves that change the math for $1M–$5M investors retiring before 65.

What is Financial Independence?

Financial independence means your portfolio generates enough to cover expenses indefinitely without requiring earned income. The standard framework: invest in a diversified portfolio and withdraw at a Safe Withdrawal Rate (SWR) low enough that historical returns keep the portfolio intact over your retirement horizon.

The FI number depends on two variables: annual spending and safe withdrawal rate.

• 4% SWR (traditional 30-year rule): Derived from Bengen's 1994 study using 1926–1992 historical returns. Works for a ~30-year retirement starting around age 65.¹
• 3.5% SWR (early retirement, 40+ years): Morningstar's 2023 research puts the safe rate at 3.7–3.8% for 30-year horizons; researchers including Pfau recommend 3.5% for 40+ year horizons due to sequence-of-returns exposure and lower expected bond returns.²
• 4.5% SWR (flexible/guardrails): With dynamic spending — cutting 10% in bad years, increasing in good ones — Kitces's research supports 4.5%+ for disciplined retirees with spending flexibility.³

For a $1M–$5M investor retiring at 45–55, the 35-40 year horizon matters. Using a 4% SWR derived from 30-year tables can understate the risk. The calculators below let you model all three scenarios.

Calculator 1 — Your FI Number

Enter your expected annual spending in retirement. The calculator shows your FI target at three safety levels and your current progress percentage.

Calculator 2 — Years to Financial Independence

How many more years until your portfolio reaches your FI number, given your current savings rate and expected return? Enter your inputs below.

Calculator 3 — Coast FIRE Number

Coast FIRE is the portfolio size at which — if you stop contributing today — compound growth alone will carry you to your FI number by a target age, without adding another dollar. You can then work part-time, cover expenses with earned income alone, and let the portfolio coast.

For $1M–$5M investors already deep into their accumulation phase, Coast FIRE often arrives years earlier than full FI, creating meaningful optionality — the ability to switch to lower-paying but more fulfilling work without disrupting the retirement plan.

The $1M–$5M Early Retirement Tax Problem

Most FIRE content focuses on saving rates. But for $1M–$5M investors, the biggest variable in early retirement is not whether you have enough — it's how much of it you get to keep.

Early retirement (before 65) creates five distinct tax planning challenges that don't exist for investors who retire at traditional age:

1. The ACA subsidy cliff (ages 50–64)

Before Medicare at 65, you're in the ACA market. In 2026, enhanced subsidies expired at year-end 2025. The subsidy cliff now sits at $62,600 for a single filer and $84,600 for a couple (400% of FPL) — meaning a dollar of income above those thresholds causes full subsidy loss, not a gradual phaseout.⁴

A $1M–$5M early retiree drawing income tactically needs to manage their ACA MAGI carefully. Key lever: Roth withdrawals don't count as ACA MAGI. A Roth conversion ladder built in pre-retirement years — paying tax now to avoid ACA exposure later — is one of the highest-ROI moves available at this wealth level. See the Roth conversion sweet spot guide for how to structure it.

2. The 0% capital gains bracket window (ages 50–64)

In early retirement before Social Security, pensions, and RMDs kick in, ordinary income is often at its lowest. In 2026, married couples keep their long-term capital gains at 0% federal rate up to $98,900 MAGI (single: $49,450).⁵

For early retirees drawing primarily from taxable accounts, strategic gain realization in the 0% bracket — often called tax-gain harvesting — permanently eliminates deferred gain that would otherwise compound and be taxed at 15–23.8% later. This technique is specific to gap years; it disappears once RMDs or Social Security fill the bracket.

3. The Roth conversion gap (ages 50–72)

The years between your last paycheck and your first RMD at age 73 (or 75 for those born 1960+) are often the lowest-bracket years of your life. Converting traditional IRA dollars to Roth at 22%–24% during this window avoids 32%–37% forced recognition later, when RMDs, Social Security, and investment income stack up. See the RMD strategy guide for the 20-year projection math.

Important ACA interaction: Roth conversions count toward ACA MAGI. A large conversion in a year when you're below the subsidy cliff can trigger full premium exposure. The optimal strategy — bracket-fill to the cliff, then stop — requires modeling both the Roth conversion and ACA impact together.

4. IRMAA lookback at 63

Medicare IRMAA uses income from two years prior. If you retire at 60 and do large Roth conversions, those conversions appear in your 62–63 MAGI — which sets your Medicare costs at 64–65. The first IRMAA tier at $109,000 single/$218,000 MFJ adds $974/year; top tier adds $5,754/year per person.⁶

Early retirees who front-load conversions without modeling the IRMAA lookback can pay $10,000–$20,000 in avoidable Medicare surcharges. The planning window is narrow: you need to know your projected 63-year-old income by the time you're 61.

5. Sequence-of-returns risk amplified by early retirement length

A 45-year retirement spans potentially three full market cycles. The sequence-of-returns problem — getting a bear market in the first 5 years — is more severe when the portfolio needs to last 40 years. Two practical responses:

• Cash or short-bond buffer (2 years of expenses): Avoids forced selling in a downturn. Refill from equities in recovery years.
• Dynamic withdrawal guardrails: Cut spending 10% when portfolio drops 20%+; increase 10% after sustained gains. Kitces's research shows this supports higher initial withdrawal rates than static rules.³

The "Millionaire but not FI" problem

At $1M in investable assets and $100,000/year in spending, the 4% rule gives you exactly a 4.0% SWR — technically at the boundary. But that assumes no taxes on withdrawals, no healthcare premium until 65, and a 30-year horizon. For a 50-year-old retiree:

• After-tax withdrawal rate is higher — if your $100K is mostly from traditional IRA withdrawals taxed at 22%, your gross withdrawal need is $128,205 to net $100,000, putting your effective SWR at 12.8% of the $1M portfolio, not 10%.
• Healthcare adds $15,000–$30,000/year in the pre-Medicare gap depending on ACA subsidy eligibility.
• A 40-year horizon requires 3.5–3.7% SWR for the same historical survival probability as 4% over 30 years.

For $1M–$5M investors, the gap between "I crossed $1 million" and "I can actually stop working" is often measured in tax strategy and account structure — not just additional savings. An advisor who specializes in early retirement planning for this wealth band can model the account-type sequencing, ACA management, Roth ladder, and 0% LTCG window in combination, which matters more at this level than it does at $10M.

What advisors do for $1M–$5M FIRE candidates

• Retirement readiness model: Full projection including taxes, healthcare bridge, Social Security timing, and dynamic spending rules — not just "portfolio × 4%."
• Account sequencing plan: Which accounts to draw in which order (taxable → traditional → Roth) and when to convert, to minimize lifetime tax.
• ACA income management: Annual income plan that keeps MAGI below (or deliberately above) the subsidy cliff threshold based on your specific healthcare situation.
• Roth conversion ladder design: 10-15 year conversion schedule during the pre-Medicare gap, modeled against IRMAA lookback and ACA exposure.
• Ongoing monitoring: Guardrail rules for spending adjustments, tax-loss and tax-gain harvesting triggers, and annual rebalancing coordination.

1. Bengen, W. P. (1994). "Determining Withdrawal Rates Using Historical Data." Journal of Financial Planning. Original study establishing the 4% rule for 30-year retirement horizons.
2. Morningstar (2023). "The State of Retirement Income: Safe Withdrawal Rates." Research by Blanchett et al. recommending 3.7–3.8% for 30-year horizons; extended horizons support lower rates. Pfau (2011) showed 3.5% or lower for 40+ year periods in low-yield environments.
3. Kitces, M. (2015). "The Ratcheting Safe Withdrawal Rate — A More Dominant Version of the 4% Rule?" Kitces.com. Dynamic guardrails research supporting higher initial withdrawal rates with spending flexibility.
4. IRS Rev. Proc. 2025-25; HHS ASPE 2025 FPL guidelines. ACA subsidy cliff at 400% FPL; $62,600 single / $84,600 couple for 2026. Enhanced subsidies enacted by ARP/IRA expired December 31, 2025. Values current as of May 2026.
5. IRS Rev. Proc. 2025-67. 2026 qualified dividend and long-term capital gains rates: 0% for taxable income up to $49,450 single / $98,900 MFJ; 15% up to $545,500 single / $613,700 MFJ; 20% above those thresholds. NIIT 3.8% applies on NII above $200K single / $250K MFJ (IRC §1411).
6. CMS Medicare & Medicaid Services (2026). 2026 Medicare Part B premium fact sheet. IRMAA first tier begins at $109,000 single / $218,000 MFJ; surcharges range from $974 to $5,754 per person annually depending on tier. Values verified as of May 2026.