How Far Are You From Financial Independence? FI Guide

The Simple Math Behind Financial Independence

Financial independence — the state in which your invested assets generate enough return to cover your living expenses indefinitely — is described by a deceptively simple equation. Invest 25 times your annual expenses (your FI number). Withdraw 4% annually. Historically, this has sustained portfolios through every market cycle, recession, and inflationary period in US market history for at least 30 years. For longer retirements common in early retirement, use 3.25-3.5% withdrawal rates.

What makes the FI timeline so sensitive to savings rate is that savings rate simultaneously determines how fast the numerator grows (your invested assets) and how small the denominator needs to be (your FI number, which is 25x expenses). Spend less, and you both accelerate accumulation and reduce the target. This is why savings rate — not raw income — is the primary lever of financial independence. Someone saving 50% of a $60,000 income reaches FI faster than someone saving 10% of a $200,000 income.

The journey to FI typically passes through several milestones before the final number. Lean FI is independence at minimum comfortable spending. Standard FI is independence at current spending. Fat FI is independence with a meaningful lifestyle budget. Coast FI — often the most important psychological milestone — is the point where you can stop contributing entirely and compound growth alone carries you to FI by your target date. Each milestone is meaningful, and reaching any of them changes your relationship with work.

Calculate your FI number and timeline

Enter your income, spending, current invested assets, and return assumptions. See your standard FI number, lean and fat FI targets, Coast FI number, years to each milestone, and exactly how different savings rates change your timeline.

Calculate My FI Number

The FIRE Framework: From FI Number to Freedom Date

1
Calculate your FI number from actual spending — not income
Your FI number is 25x your expected annual spending in financial independence. If you plan to spend $48,000/year, your FI number is $1,200,000. Not $1,200,000 of pre-tax 401k assets — of after-tax investable wealth. If your assets are mostly in pre-tax accounts, you need roughly 15-20% more to account for withdrawals being taxed as ordinary income. Build your FI number from a detailed spending plan, not from a generic income multiple.
2
Calculate your current savings rate accurately
Savings rate = (annual savings) ÷ (annual take-home income), expressed as a percentage. Include all savings: 401k contributions (employer match counts too), IRA contributions, taxable brokerage contributions, and net debt paydown. Do not include mortgage principal paydown unless you plan to sell the home and use equity in retirement. A precise savings rate is the most important single input — it determines both your FI timeline and your required accumulation.
3
Know your Coast FI number and when you hit it
Coast FI is the invested balance at which compound growth alone will carry your portfolio to your FI number by your target retirement age, without further contributions. The formula: Coast FI = FI Number ÷ (1 + return rate)^(years to retirement). At age 35 with a $1,200,000 FI number, targeting retirement at 55, and 7% returns: Coast FI = $1,200,000 ÷ (1.07)^20 = $310,000. Reaching $310,000 at 35 means you never need to invest another dollar — your existing portfolio will grow to $1.2M by 55.
4
Model lean, standard, and fat FI to understand your spectrum of options
Lean FI — based on minimum comfortable spending — might be reachable 5-8 years before standard FI. Reaching Lean FI does not mean you stop working, but it means you could — dramatically changing your negotiating position with employers, your tolerance for career risk, and your psychological experience of work. Most FIRE practitioners find that hitting Lean FI is the most important psychological transition, regardless of whether they choose to stop working.
5
Stress-test your FI number against sequence-of-returns risk
The biggest risk to FI is retiring into a major market downturn — the sequence of returns in the first decade of retirement matters enormously. Mitigations: maintain 1-2 years of expenses in cash to avoid selling equities during downturns; use a flexible withdrawal strategy (cut spending 10-15% in bad years); plan for a part-time income bridge in early retirement; build in a 10-15% safety margin above your calculated FI number before declaring FI. The 4% rule has a historical success rate of 95%+ for 30-year retirements — but 30-year retirements at age 35 are actually 60-year retirements, warranting the 3.25-3.5% rate.

Financial Independence — Common Questions

Is financial independence realistic on an average salary?

Yes — the key is savings rate, not absolute income. At a 25% savings rate with 7% returns, anyone reaches FI in approximately 32 years from a zero start. At 40% savings rate, in 22 years. At 50%, in 17 years. The time to FI is largely independent of income level because both the accumulation speed and the FI target are driven by spending. Someone earning $60,000 and spending $36,000 has the same FI timeline as someone earning $120,000 and spending $72,000.

How do I handle healthcare costs if I retire early before Medicare?

Healthcare is the most significant planning risk for early retirees. Before age 65 (Medicare eligibility), you must purchase private health insurance. ACA marketplace plans for a couple in their 40s run $1,000-2,000/month without subsidies. With income below 400% of the federal poverty level ($58,000 for a couple in 2024), ACA subsidies can reduce costs dramatically. Early retirees often use Roth conversions and capital gain management to keep Modified Adjusted Gross Income in the subsidy range. Budget $15,000-25,000/year per household for healthcare in your pre-Medicare FI spending plan.

Should I count my 401k toward my FI number?

Yes, with a 20-25% haircut for anticipated taxes on withdrawal. A $1,000,000 traditional 401k is worth roughly $750,000-$800,000 in after-tax spending power, depending on your marginal rate in retirement. Roth accounts and after-tax brokerage accounts count at face value. Build your FI calculation using after-tax values to avoid overestimating your retirement readiness. Many FI practitioners maintain a mix of pre-tax, Roth, and taxable accounts specifically to manage taxable income in retirement.

What is the difference between FI and FIRE?

Financial Independence (FI) means your assets fund your expenses indefinitely. Retire Early (RE) in FIRE means stopping traditional employment early — often in your 30s, 40s, or 50s. You can achieve FI without retiring early: FI simply means work becomes optional. Many FI practitioners reach the number and continue working in lower-stress, more meaningful, or part-time capacities rather than stopping entirely. The value of FI is the freedom and negotiating power it provides, not necessarily the cessation of work.

How far are you from financial independence?

Enter your numbers and get your FI number, Coast FI milestone, current progress, and a projection showing exactly when you reach financial freedom at different savings rates.

Calculate My FI Timeline