Financial Independence Number Calculator 2026 — Your Exact FI Number

A Financial Independence (FI) Number is the invested portfolio value at which passive investment income fully covers your annual living expenses, freeing you from the need to work for money. Unlike conventional retirement savings goals that target a specific age (typically 65), your FI Number is based entirely on your spending rate. A person spending $40,000 per year needs $1,000,000 (at 4% SWR); one spending $100,000 needs $2,500,000. Your income level is nearly irrelevant — your spending level is everything.

Guaranteed income from Social Security, a pension, or other non-portfolio sources acts as a permanent offset against the expenses your investment portfolio must cover. Every $12,000 per year in guaranteed income reduces your required portfolio by $300,000 at a 4% SWR (because $12,000 / 0.04 = $300,000). Factoring in your projected Social Security benefit at age 62, 67, or 70 is therefore essential to calculating your true personal FI Number.

The original 4% SWR was validated for 30-year retirement periods. For early retirees planning for longer horizons of 40 to 60 years, historical research suggests a slightly more conservative rate of 3.25% to 3.5% provides similar safety margins. Many FIRE community members use 3.5% as a prudent baseline for extra-long retirements, which translates to a portfolio target of 28.6x annual expenses rather than the standard 25x.

Invested assets for FI Number purposes include: 401(k) and employer-sponsored plan balances, Traditional and Roth IRA balances, Health Savings Account (HSA) investment balances, taxable brokerage account investment holdings, and the market value of REITs or dividend stocks. Generally excluded are: your primary home equity (unless you plan to downsize), physical gold or collectibles, cash in checking/savings accounts, and illiquid private equity.

Reducing your annual spending by $12,000 (equivalent to $1,000 per month) produces a double compound benefit for your path to financial independence. First, it directly reduces your FI Number by $300,000 at a 4% SWR (since $12,000 / 0.04 = $300,000). Second, that same $1,000 per month can be redirected to additional investing, accelerating accumulation. This dual effect is why frugality and expense optimization are the highest-leverage tools in the FI toolkit.

FI Number calculations typically assume a diversified portfolio of low-cost stock and bond index funds, with broad US equity (such as VTI or VOO), international equity, and a bond allocation that increases near retirement. The classic "100-minus-age" rule suggests a gradually shifting allocation. Most FIRE practitioners invest primarily in total stock market index funds and US/international ETFs through tax-advantaged accounts (401k, Roth IRA, HSA) first, then taxable brokerage accounts.