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The 4% Rule for Retirement: Does It Still Work in 2024?

🕑 7 min read  ·  FinCalcHub Editorial

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 Origin: The Trinity Study

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.

How to Calculate Your Target Number

Criticisms and Modern Adjustments

Withdrawal Rates by Retirement Horizon

The 4% Rule in South Africa

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.

Beyond the Withdrawal Rate: Flexible Spending

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.

Sequence of Returns Risk

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:

• Hold 1–2 years of expenses in cash when you retire
• Maintain 2–3 years in short-term bonds as a buffer
• Consider a flexible withdrawal rate: cut by 10% in years when the market is down 15%+

The Bottom Line

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.

Worked Example: A $1.5M Portfolio in Action

Take a couple retiring at 65 with $1.5 million in a 60/40 portfolio. The 4% rule says they withdraw $60,000 in year one. They top that up with Social Security (the average retired-worker benefit was $1,976/month in early 2026 per the SSA, or roughly $23,700/year per person), giving them about $107,000 of gross income in year one. In year two, they raise the withdrawal by the prior year's CPI — if inflation prints at 3.1%, they take $61,860, regardless of what the market did.

Now run three return scenarios for the first decade. At a steady 7% real return, the portfolio grows to roughly $1.95M after ten years of withdrawals — they end up wealthier than when they started. At 5% real, the portfolio holds at about $1.55M, treading water but intact. At 0% real for the first decade (a plausible "lost decade" for equities, similar to 2000-2010), the balance drops to about $930,000 — they have spent down a third of the portfolio with twenty years still to go.

The third scenario is sequence-of-returns risk in plain English. Losing 20% in year one means the $60,000 withdrawal is now 5% of a shrunken $1.14M balance. If the next withdrawal isn't trimmed, the portfolio enters a death spiral that 20 years of average returns can't undo. The fix is mechanical: hold 18–24 months of expenses ($90k–$120k) in cash or T-bills before retiring, and refill that bucket from equities only in up years. That single rule has historically converted most "failed" 4%-rule retirements into successful ones in backtests.

What People Get Wrong About the 4% Rule

• Treating it as a withdrawal cap, not a starting point. Bengen's original 1994 paper assumed annual inflation-indexed withdrawals from a static portfolio. Real retirees adjust. Using 4% as a hard rule throughout retirement is more conservative than the research requires.
• Forgetting it's a pre-tax number. The 4% comes out of the portfolio, but you still owe income tax on traditional 401(k) and IRA withdrawals. On $60,000 of withdrawals, federal tax alone could be $4,000–$7,000 depending on bracket and state.
• Ignoring fees. A 1% advisory fee plus 0.5% fund expenses converts a 4% withdrawal into a 5.5% drag on the portfolio. Historical 4%-rule success rates assumed near-zero costs.
• Applying US data to UK or SA portfolios. The Trinity Study used US equities and bonds. Wade Pfau's international research found safe withdrawal rates dropped to 3.0–3.5% in most developed markets — the US was an outlier on the high side.
• Counting on a fixed retirement length. Life expectancy at 65 in the US is now about 84 (CDC, 2023 data). Plan for 30 years if retiring at 65, but build in optionality for 35 if both spouses are healthy.

Regional Differences: USA, UK, South Africa

USA. The 4% rule was built on US data and most closely fits an American retiree with diversified equities, Social Security, and Medicare from 65. Traditional 401(k) and IRA withdrawals are taxed as ordinary income; Roth withdrawals are tax-free after 59½. Medicare covers most major medical costs from 65, so the portfolio doesn't need to fund private health insurance the way an early retiree's does.

UK. The State Pension (£221.20/week in 2024-25, roughly £11,500/year, per gov.uk) provides a smaller base than US Social Security, so UK portfolios typically need to do more work. SIPP and personal-pension withdrawals are 25% tax-free and 75% taxed at your marginal rate. The Bank of England's long-term inflation target is 2%, but real-world CPI has run hotter since 2022. UK financial planners often cite a 3.5% safe withdrawal rate for sterling portfolios, reflecting lower historical equity returns than the US benchmark.

South Africa. The Old-Age Grant (R2,310/month in 2025 for over-60s, per SASSA) is means-tested and modest, so most middle-class retirees rely almost entirely on RA, preservation fund, and discretionary investments. SA's inflation target is 3–6%, but currency depreciation against the dollar is the bigger long-term issue: a rand-denominated portfolio funding imported goods (medicine, electronics, overseas travel) loses real purchasing power even when CPI looks tame. ASISA's Retirement Reality Report 2024 found just 6% of South Africans retire financially independent. A 3.0–3.5% withdrawal rate with at least 30% offshore equity exposure is the standard local-planner recommendation.

Actionable Next Steps

1. Multiply your desired annual retirement spending by 25. That's your 4% target. Compare it to your current portfolio value.
2. Open the Retirement Savings Calculator and enter your current balance, monthly contribution, and years to retirement to see if you're on track.
3. If retiring before 60, drop your withdrawal rate to 3.5%. If FIRE-ing in your 40s, use 3.0%.
4. Build a 1–2 year cash buffer in the five years before retirement to neutralise sequence-of-returns risk.
5. Re-run the maths every two years. Real life — inheritances, redundancies, market crashes — will move the target.