There is a rule that circulates the FIRE world with the confidence of something that has never needed questioning: withdraw 4% of your portfolio per year, and your money will last indefinitely. The rule has a name, a history, and decades of backtesting behind it. The problem is that it was built on American data, for American markets, and tested against an inflation history that Brazil has never shared.
William Bengen published his landmark research in 1994, analysing portfolios of stocks and bonds across every available 30-year historical window in US market data. Four years later, the Trinity Study consolidated the concept: portfolios with a strong equity allocation survived 95% of historical scenarios with inflation-adjusted withdrawals of 4% per year. The rule held through the Great Depression, the dot-com crash, and 2008.
Brazil is not the United States. Our inflation history includes hyperinflation. Our stock market has only a handful of 30-year periods available for testing. And in 2026, Brazilian fixed-income instruments are delivering real returns of nearly 10% per year — something that simply does not exist in any other major market. The right question is not “is 4% conservative enough for Brazil?” The right question is: was this rule ever designed for us?
1. Where the 4% rule comes from — and what it actually says
Bengen’s research identified the safe withdrawal rate (SWR): the maximum percentage a retiree could withdraw annually without ever running out of money, regardless of which 30-year historical window their retirement happened to begin in.
The Trinity Study reached similar conclusions: 4% succeeded in approximately 95% of historical scenarios over 30-year horizons for portfolios with a strong equity allocation. For 40 years — the more relevant horizon for early FIRE retirements — the success rate falls to roughly 85–90% depending on asset allocation.
| Retirement horizon | Success rate (4%) | Portfolio tested |
|---|---|---|
| 20 years | ~98% | 75% stocks / 25% US bonds |
| 30 years | ~95% | 75% stocks / 25% US bonds |
| 40 years | ~85–90% | 75% stocks / 25% US bonds |
| 50+ years | Lower | 75% stocks / 25% US bonds |
What matters is that these success rates were calculated against a specific market, with a specific inflation history. Transporting this number to Brazil implicitly assumes our market behaves like the American one — which it never has.
2. Why Brazil is structurally different
Brazil has four characteristics that make a direct application of the 4% rule problematic.
The first is its inflation history. The United States experienced decades of relatively contained inflation. Brazil went through hyperinflation that was only tamed by the Plano Real — the country’s 1994 currency stabilisation plan. This means that the useful data window for testing withdrawal strategies begins just 30 years ago, and even then against a highly unstable macroeconomic backdrop in the early years.
The second is the depth of its local capital markets. The American stock market has over 150 years of reliable data. Brazil’s Ibovespa (the country’s main stock index) has robust data only from the post-Plano Real era. For 30-year historical testing, we have just two complete periods: 1994–2023 and 1995–2024. That is statistically insufficient to state with confidence what a safe withdrawal rate for a Brazilian investor actually is, based on local data alone.
The third is the interest rate structure. Brazil has historically maintained nominal and real interest rates well above those of other major markets. This creates a different dynamic: Brazilian fixed-income instruments — particularly Tesouro IPCA+ (government inflation-linked bonds) — serve a role that in most other countries would be reserved exclusively for long-term equities.
The fourth is the composition of the modern Brazilian portfolio and currency risk. Today’s Brazilian FIRE investor rarely concentrates their entire wealth in the Ibovespa and CDI (Brazil’s interbank overnight rate). Access to global ETFs — such as IVVB11 (an S&P 500 ETF traded locally on the Brazilian exchange), BDRs (Brazilian Depositary Receipts, which allow investors to hold foreign stocks in local accounts), and internationally exposed funds — has democratised geographic diversification, and a globally diversified portfolio is increasingly common and advisable. But this introduces a variable that no SWR calculation based purely on Brazilian data captures: currency risk. A weakening real amplifies the nominal returns of foreign assets; a strengthening real can compress them significantly. Planning a withdrawal rate for a multi-currency portfolio is a more complex exercise than any simple rule can accommodate.
3. Brazil’s safe withdrawal rate — what local data actually shows
In January 2025, AA40 — Brazil’s main FIRE community blog — published the first official calculation of a safe withdrawal rate for Brazil, using a methodology equivalent to the Trinity Study adapted to the local market. The portfolio tested was a 50% Ibovespa / 50% CDI allocation, representative of long-term investors focused on domestic assets.
The result: 8.48% per year as the historical SWR for the available 30-year window. When 2025 data was incorporated in January 2026, a second 30-year historical series became available — and the figure held consistent.
It is important to understand what this calculation does and does not represent: the 8.48% SWR was computed for an exclusively domestic portfolio. Investors with meaningful exposure to international assets — global ETFs, BDRs, foreign funds — operate with a different profile, where returns depend on both foreign market performance and the real/dollar (or real/euro) exchange rate. For these portfolios, Brazilian historical data alone does not provide a direct answer, and the withdrawal rate must be considered in terms of global real returns, not just local ones.
For those who want to preserve real capital indefinitely — the PWR (Perpetual Withdrawal Rate) — the figure falls to approximately 1.96% per year. This is considerably more conservative than its American equivalent.
“With only two complete 30-year historical series available in Brazil, any number you call a ‘safe withdrawal rate’ is an estimate — not a law.”
What these numbers reveal is a far wider distribution of outcomes than in the US: Brazil has delivered extraordinary real returns in some periods and prolonged negative real returns in others. Planning for the average is risky. Planning with margin for the worst plausible scenario is more honest.
4. The Selic paradox: when fixed income becomes a FIRE strategy
In May 2026, Brazil’s benchmark interest rate — the Selic — stands at 14.5% per year following a cut by Copom (Brazil’s monetary policy committee). With IPCA (Brazil’s official inflation index) projected at around 4.9% for the year — and rising for the ninth consecutive week according to the Focus Report, the central bank’s weekly market expectations survey — the implied real interest rate is approximately 9 to 10% per year, among the highest in the world for an economy of meaningful scale.
This creates an unusual situation in the history of Brazilian FIRE: a portfolio invested in long-dated Tesouro IPCA+ can deliver real returns of 6–7% per year without exposing the investor to stock market volatility. At a 4% withdrawal rate, that portfolio grows in real terms even while drawing income.
| Portfolio scenario | Estimated real return (2026) | 4% withdrawal | Outcome |
|---|---|---|---|
| 100% Tesouro IPCA+ | ~6–7% p.a. | 4% p.a. | Portfolio grows in real terms |
| 50% Ibovespa / 50% CDI | Variable | 4% p.a. | Depends on market cycle |
| 100% Ibovespa | Variable | 4% p.a. | High volatility, sequence matters greatly |
| Globally diversified (e.g. 40% Ibov / 30% CDI / 30% global ETF) | Variable + FX | 4% p.a. | Returns also depend on BRL/USD movement |
The temptation to anchor your FIRE plan to today’s rates is understandable — but dangerous. The Focus Report projects the Selic at 13% by end of 2026, 11.25% in 2027, and 10% in 2028. Today’s exceptional real yields are a cycle, not a structural feature of the Brazilian economy.
5. The risks that numbers don’t capture
The safe withdrawal rate — whether Brazilian or American — captures historical risk. What it cannot capture are risks that haven’t happened yet, or that occurred under circumstances the data doesn’t fully represent.
Reinvestment risk is the most immediate. Those who allocate heavily to Tesouro IPCA+ at 7% real in 2025–2026 need to consider what happens when those bonds mature and new issuances offer 4% or 5% real — a plausible scenario if Brazil converges toward international rate norms. A portfolio that looks sustainable today may not be equally sustainable in 2035.
Political and fiscal risk remains present. Brazil has a history of changes to investment tax rules and fiscal shocks that have affected inflation and exchange rates. A financial independence plan that does not account for the possibility of regulatory surprises is incomplete.
Sequence-of-returns risk exists in Brazil just as in any other market — and can be more severe given the Ibovespa’s volatility. You can explore this dynamic in our article on the risk that average returns cannot see.
6. What withdrawal rate to use in practice
Brazil’s most experienced FIRE practitioners converge on some practical guidelines that diverge from the American original.
| Profile | Recommended SWR | Conditions |
|---|---|---|
| Conservative | 3 to 3.5% | No earned income, long horizon (40+ years) |
| Moderate | 3.5 to 4% | Flexibility to reduce withdrawals in downturns |
| Flexible | Up to 4.5% | Supplemental income possible, adjustable spending |
| Fixed income (2026 context) | Up to 5% currently | Only viable at today’s rates — this is transitional |
The single most important word in any Brazilian withdrawal strategy is flexibility. The difference between a plan that survives and one that doesn’t is not the number chosen — it is the willingness to reduce spending in crisis years, adjust allocation as the rate cycle shifts, and refuse to treat the SWR as a contractual guarantee.
The withdrawal rate defines the starting point. What determines whether the plan survives is the ability to adapt that number over decades.
What this means for your FIRE plan
The 4% rule is not wrong — it was honest about its limitations from the start. The problem is applying it to a context it was never designed for. If you are building a FIRE plan in Brazil, some concrete questions are worth answering now:
- What is your actual SWR? Calculate based on your retirement horizon (20, 30, or 40+ years) and your specific asset mix — do not copy the American number.
- Does your plan include spending flexibility? A fixed withdrawal rate with no capacity to adjust is the weak point of any long-term strategy.
- Are you capturing today’s interest rates intelligently? Tesouro IPCA+ at real yields above 6% represents a historical opportunity — but it demands attention to maturity dates and reinvestment risk when the Selic eventually falls.
- How long does your plan need to last? That changes everything. Use our Life Expectancy Quiz to estimate your real planning horizon before locking in a withdrawal rate.
- Has your portfolio been stress-tested against Brazilian scenarios? Model different inflation, Selic, and equity return paths with our Retirement Calculator — including a pessimistic scenario with IPCA above 8% and negative real equity returns for three consecutive years.
The goal is not to find the perfect rate. It is to build a plan capable of surviving the scenarios you cannot predict.
This article is for general educational purposes and does not constitute financial advice. The withdrawal rates discussed are based on historical data and simulations; past results do not guarantee future outcomes. The high interest rate environment described reflects conditions in May 2026 and may change significantly. For advice tailored to your specific circumstances, consult a qualified financial adviser.