What Is a Financial Independence Target?

Your Financial Independence Target is an estimate of the portfolio value needed to fund the part of your spending that your investments must cover, at a chosen withdrawal rate. Reaching it suggests paid work may no longer be required under those assumptions — but that depends on future spending, returns, taxes, fees, other income and how long retirement lasts. Until you reach it, you're still accumulating.

The name varies across the FIRE community — "FIRE number," "FI number," "your number" — but the concept is universal. Every variant of FIRE has a financial independence target. The math is always the same; only the spending input changes.

What counts toward your financial independence target

• Stocks and bonds in brokerage accounts
• Index funds and ETFs
• 401(k), IRA, Roth, and equivalent retirement accounts
• HSA balances (if invested)
• Cash earmarked for the withdrawal plan

What does NOT count

• Your primary residence (it doesn't fund expenses)
• Cars and personal possessions
• Emergency fund (separate from the FIRE portfolio)
• Future Social Security or pensions — not part of the portfolio, but reliable income can reduce the spending the portfolio has to fund
• Expected inheritances (not guaranteed)

Common multipliers by withdrawal rate

• 5.0% rate → 20× expenses
• 4.0% rate → 25× expenses
• 3.5% rate → 28.6× expenses
• 3.25% rate → 30.8× expenses
• 3.0% rate → 33.3× expenses

These multipliers are arithmetic. On their own, they do not show which withdrawal rate suits a particular retirement horizon.

Worked example

A household spends $48,000 a year. Their financial independence target at various rates:

• At 4%: $1,200,000
• At 3.5%: $1,371,000
• At 3%: $1,600,000

A 1% change in the withdrawal rate moves the target by roughly $400,000 — about a third of the lower number. The rate choice matters as much as the spending input.

Use the Financial Independence Target Calculator to test multiple withdrawal rates against your real expenses.

Your Financial Independence Target is set by what you spend, not what you earn. This is the single most important property of the formula. A $10,000 cut in annual expenses removes $250,000 from your target at 4% — or $333,000 at 3%.

That's why FIRE planning starts with a clear, honest read on your real annual spending. A vague "I think we spend about $50k" can hide $10,000 of irregular costs — and a $250,000 hole in your plan. See The Power of Saving Rate for how expense discipline collapses timelines.

The leverage works in both directions

Lifestyle inflation does the inverse. Adding $10,000 of annual spending today raises your financial independence target by $250,000 at 4% — or about $333,000 at 3%. How much longer that larger target takes to reach depends on your savings, contributions and investment returns.

The 4% rule's origin

In 1994, William Bengen tested withdrawals against historical U.S. data, using portfolios of common stocks and intermediate-term U.S. Treasuries. With a 50/50 mix, a 4% starting withdrawal adjusted for inflation lasted at least 30 years in every historical period he tested.

Source: Bengen (1994), “Determining Withdrawal Rates Using Historical Data”.

The later Trinity Study tested five stock/bond mixes with a different bond series and reported historical success rates. Here, "success" means the portfolio still had money left at the end of the period. For a 50/50 portfolio, a 4% inflation-adjusted withdrawal succeeded in about 95% of the tested 30-year periods, not all of them.

Source: Pfau (2015), “Sustainable Retirement Spending with Low Interest Rates: Updating the Trinity Study”.

These are results from past data, not forecasts. The 25× multiplier is simply the arithmetic inverse of 4% (1 ÷ 0.04 = 25), the same multiplier used in the Rule of 25.

Why early retirees often use less than 4%

• Retirements may last 40–50 years, not 30.
• Sequence-of-returns risk hits hardest in early years.
• Future returns may differ from the historical periods the original research tested.
• The cost of being wrong is severe — running out of money at 75.

How retirement length affects the rate

Longer retirement horizons generally require testing lower starting-rate assumptions. In Morningstar's 2025 base-case model, the estimated starting withdrawal rate was 3.9% for 30 years, 3.5% for 35 years and 3.3% for 40 years.

The model assumes fixed inflation-adjusted spending and a 90% success target, and excludes taxes and investment fees. These are model-specific results under stated assumptions — not recommendations or guarantees — and they do not establish a rate for retirements longer than 40 years.

Comparing your target at several rates shows how sensitive the result is to this assumption.

Source: Morningstar (2025), “The State of Retirement Income: 2025”.

For a deeper dive, read The 4% Rule Explained.

Use real data, not estimates

Export 12 months of bank and credit card transactions. Categorise them. Don't trust monthly averages — irregular costs (travel, gifts, car repairs, medical) hide there.

Add the lines people forget

• Healthcare premiums and out-of-pocket costs
• Property tax, home insurance, and major maintenance
• Car replacement amortised over 8–10 years
• Travel and gifts
• Annual subscriptions and software
• One-off costs (appliances, tech, furniture) amortised

Stress-test the number

Change the assumptions that matter most — higher spending, a lower withdrawal rate, taxes and fees — and see how much the target moves. A target that only works under one set of assumptions is fragile.

• Lean FIRE: a target based on deliberately lean spending.
• Coast FIRE: a discounted version of the financial independence target based on years to traditional retirement.
• Barista FIRE: target reduced by the part-time income portion.
• Standard FIRE: a target based on a moderate spending plan.
• Fat FIRE: a target based on higher, more generous spending.

Because each target is spending divided by a withdrawal-rate assumption, the same FIRE label can correspond to very different portfolio amounts.

• Using income as the target. A take-home of $80,000 with $50,000 of expenses produces a financial independence target of $1.25M, not $2M.
• Forgetting taxes and fees. Taxes on withdrawals depend on account type and jurisdiction, while investment fees reduce net returns. Include both in your planning assumptions rather than treating them as zero.
• Counting your house. Equity in a home you live in doesn't fund a withdrawal plan unless you intend to downsize.
• Picking a withdrawal rate based on hope. Be honest about your retirement length and risk tolerance.
• Ignoring inflation over 30+ years. At an assumed 3% a year, spending of $50,000 today would cost about $90,000 in 20 years. In the historical 4% framework, the starting withdrawal is then adjusted for inflation each year. For the target arithmetic in this guide, keep spending and the target in today's purchasing power unless you deliberately choose to express both in future nominal dollars. Do not mix the two bases in the same calculation.
• Never recalculating. Spending evolves over a decade. A 5-year-old target is almost always wrong.
• Treating it as a finish line, not a moving target. The number drifts with inflation, market conditions, and life stage. Treat it as a yearly check-in.