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Open the Retirement Savings Calculator →The 4% rule is the most cited number in retirement planning: withdraw 4% of your portfolio in year one, then adjust for inflation each year. Your money should last 30 years. But where did it come from, does it still work, and how do you apply it in different countries?
The 4% rule emerged from the 1998 Trinity Study, which analysed US historical market data from 1926. It found that a 60/40 portfolio (60% stocks, 40% bonds) with a 4% initial withdrawal rate had a near-100% success rate over 30-year periods. "Success" meant the portfolio had money remaining at the 30-year mark.
| Criticism | Response / Adjustment |
|---|---|
| Based on US data only | International markets have lower historical returns; use 3.5% for non-US or globally diversified portfolios |
| 30-year horizon too short (retiring at 55) | Use 3.5% for 35–40 year retirements; 3% for FIRE at 40–45 |
| Low bond yields in 2010s | Equity-heavy portfolios still support 4%; current higher yields improve bond component |
| Sequence of returns risk | Retire into a bad market and the same SWR fails; use a cash buffer of 1–2 years expenses |
| Retirement horizon | Suggested SWR | Target multiplier |
|---|---|---|
| 30 years (age 65) | 4.0% | 25× annual spending |
| 35 years (age 60) | 3.75% | 27× annual spending |
| 40 years (age 55) | 3.5% | 29× annual spending |
| 50 years (FIRE at 45) | 3.0% | 33× annual spending |
South Africa's higher inflation (~5–6%) and currency risk mean a 4% withdrawal of a rand-denominated portfolio carries more risk than the same rate on a US dollar or sterling portfolio. SA financial planners often recommend targeting 3–3.5% withdrawal rate, especially for conservative retirement plans. The Two-Pot system adds complexity for RA holders retiring before 55.
The most successful retirees don't spend a fixed 4% — they spend flexibly. In good market years, they spend more. In down years, they spend less (travel less, delay big purchases). This flexibility dramatically improves portfolio survival without sacrificing quality of life in the long run.
The biggest threat to a 4% withdrawal plan is retiring at the start of a significant bear market. A 30% market drop in year 1 of retirement permanently impairs a portfolio on a fixed withdrawal schedule. Mitigations:
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Open Retirement Calculator →The 4% rule is not a guarantee — it's a historically-grounded guideline. It works as a planning starting point. For most people retiring at 65 with a diversified portfolio, 4% is reasonable. For those retiring early, in non-US markets, or with lower risk tolerance, 3–3.5% is more prudent. The most important thing: have a number. Any plan beats no plan.