Safe Withdrawal Rate (SWR) — safe withdrawal rate

What is Safe Withdrawal Rate?

Safe Withdrawal Rate (SWR), or safe withdrawal rate, is the maximum percentage of an investment portfolio that you can withdraw annually without risking depletion of funds over a specified time horizon. Most commonly referred to as the 4% rule.

Quick Answer

Safe Withdrawal Rate (SWR) is the maximum percentage of a portfolio you can withdraw annually without risking depletion over a set horizon, most commonly the 4% rule. Popularized by William Bengen in 1994 and confirmed by the Trinity Study (1998), it showed a 50-75% stock portfolio survived 30 years in over 95% of historical US scenarios. Because that data is US-specific and Poland charges 19% Belka tax, many Polish FIRE practitioners use a more conservative 3-3.5% rate, especially for longer horizons. The 25x rule is simply its inverse. This is educational information, not investment advice.

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Where does the 4% rule come from?

The 4% rule was popularized by William Bengen in 1994 and confirmed by the Trinity Study (1998). The research analyzed historical returns of the US market from 1926 and showed that a portfolio consisting of 50-75% stocks and 25-50% bonds survived at least 30 years with annual withdrawals of 4% of initial value (adjusted for inflation) in over 95% of scenarios.

How does it work?

1. In the first year of FIRE, you withdraw 4% of portfolio value
2. In each subsequent year, you withdraw the same amount increased by inflation
3. The portfolio grows (or falls) independently of withdrawals

Example

Portfolio: 2,000,000 PLN. Inflation: 3%.

• Year 1: withdrawal 80,000 PLN (4%)
• Year 2: withdrawal 82,400 PLN (80,000 × 1.03)
• Year 3: withdrawal 84,872 PLN (82,400 × 1.03)

Is 4% really safe?

It depends on context:

Arguments for

• 95%+ of historical scenarios ended successfully
• In most cases, the portfolio at the end of 30 years was larger than at the beginning
• Accounts for wars, crises, stagflation

Arguments against

• Based on historical US market data (best market in history)
• 30 years is too short if you transition to FIRE at age 35
• Current stock valuations are historically high, which may lower future returns
• Doesn't account for Polish taxes (19% on capital gains)

Alternative approaches

Lower SWR (3-3.5%)

For longer horizons (40-50 years) or more conservative investors. Requires a larger portfolio, but gives peace of mind.

Dynamic withdrawals

Instead of a fixed amount, you adjust withdrawals to market conditions — in good years you withdraw more, in bad years less. Increases portfolio survival chances.

Guardrails strategy

You set upper and lower withdrawal limits. If the portfolio grows above the upper limit — you give yourself a raise. If it falls below the lower limit — you temporarily cut expenses.

How Freenance can help

Freenance calculates your personal SWR based on real assets, expenses and time horizon. Financial Freedom Runway shows how many months you'll survive at the current withdrawal level — and how changing strategies will affect the outcome.

👉 Check your Runway with Freenance — freenance.io

Related Articles

• Zasada 25x — ile potrzebujesz na niezależność finansową
• Sequence of Returns Risk — ryzyko sekwencji zwrotów
• Jak policzyć, ile potrzebujesz na FIRE — kalkulator i zasada 25x
• Jak osiągnąć FIRE w Polsce — kompletny przewodnik 2026

FAQ

Where does the 4% rule actually come from?

The 4% rule was first proposed by financial advisor William Bengen in a 1994 paper analyzing historical US market data back to 1926. It was later reinforced by the Trinity Study (1998), which tested various stock/bond mixes and withdrawal rates across 30-year retirement horizons. Both studies found 4% to be a withdrawal rate that survived nearly all historical scenarios — but the data is US-specific.

Is 4% safe for a 50-year retirement?

For very long horizons such as early FIRE at age 35, many researchers recommend a lower SWR of 3.0-3.5%. The original Bengen study modeled a 30-year horizon, and probability of portfolio failure rises non-linearly when you extend to 50 or 60 years. A smaller initial withdrawal gives a larger margin of safety against sequence risk.

Does the 4% rule apply in Poland?

The original studies used US data, which historically delivered higher real equity returns than most European markets. Polish investors also pay 19% Belka tax on capital gains, which effectively reduces net withdrawal power. As a result, many Polish FIRE practitioners use a more conservative 3-3.5% SWR.

What is the difference between SWR and the 25x rule?

The 25x rule is simply the inverse of a 4% SWR — if you want 4% of your portfolio to cover annual expenses, you need 25 times those expenses saved. SWR focuses on the withdrawal side, the 25x rule on the target accumulation. They describe the same relationship from different angles.

Is this financial advice?

No. This article is educational content and not investment, tax, or financial advice within the meaning of Polish KNF regulations. Withdrawal strategies depend on individual circumstances, tax situation, and risk tolerance — consult a licensed advisor before making decisions about your portfolio.