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Portfolio Income by Size and Rate
Your portfolio income is straightforward: annual withdrawal = portfolio × withdrawal rate. Monthly income = annual withdrawal ÷ 12. The withdrawal rate determines how aggressive or conservative you are about depleting the portfolio.
| Portfolio | 3% Rate | 4% Rate | 5% Rate |
|---|---|---|---|
| $500,000 | $1,250/mo | $1,667/mo | $2,083/mo |
| $750,000 | $1,875/mo | $2,500/mo | $3,125/mo |
| $1,000,000 | $2,500/mo | $3,333/mo | $4,167/mo |
| $1,500,000 | $3,750/mo | $5,000/mo | $6,250/mo |
| $2,000,000 | $5,000/mo | $6,667/mo | $8,333/mo |
The Social Security Effect
Social Security is the most powerful variable in retirement income planning. It's inflation-indexed, lifetime-guaranteed income that reduces the burden on your portfolio. The math is direct:
- $1,500/month Social Security → reduces required portfolio by $450,000 at 4% rule
- $2,000/month → reduces required portfolio by $600,000
- $2,500/month → reduces required portfolio by $750,000
Consider a couple where both spouses worked and have combined Social Security benefits of $4,500/month. If they need $7,000/month total, their portfolio only needs to generate $2,500/month — requiring $750,000 at the 4% rule. Without Social Security, the same lifestyle would require $2,100,000. Social Security converts a retirement funding problem into a much more manageable calculation.
Withdrawal Rate: The Tradeoff
A higher withdrawal rate means more monthly income now but greater depletion risk over time. The 4% rule has a high historical success rate over 30 years. At 5%, success rates drop to around 80%–85% — meaning roughly 1 in 5 historical 30-year periods ended with the portfolio depleted. For most people, accepting an 80% success rate is too risky.
For early retirees (30–40 year horizons), 3.5% is often recommended. For retirees in their 70s with shorter horizons, 5%–6% may be appropriate. The right rate depends on your age, other income sources, flexibility to cut spending, and how much you want to leave behind.
Roth vs. Traditional IRA Income Efficiency
Where your retirement savings are held affects how much you actually spend from each withdrawal. Traditional IRA and 401k withdrawals are fully taxable as ordinary income. If you withdraw $60,000 from a traditional IRA in a year, you might pay $8,000–$12,000 in taxes — leaving $48,000–$52,000 to spend. Roth IRA withdrawals are completely tax-free. $60,000 from a Roth stays $60,000. This is why Roth conversions before retirement (at lower tax rates) can meaningfully improve retirement income efficiency — and why the Roth Conversion Calculator belongs in your retirement planning toolkit.
To work backward from income needs to required savings, the FIRE Number Calculator shows the portfolio target based on your spending. For a step-by-step approach to the entire accumulation side, read our guide on how to calculate your FIRE number.
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Frequently Asked Questions
How much income does a $1 million portfolio generate?
At 4%: $40,000/year ($3,333/month). At 3.5%: $35,000/year ($2,917/month). At 5%: $50,000/year ($4,167/month). Add Social Security on top for total income. A $1,800/month Social Security benefit plus $3,333/month from the portfolio = $5,133/month total.
How much do I need to retire on $5,000 a month?
Portfolio only: $1,500,000 at 4%. With $2,000/month Social Security: $900,000. With $2,500/month Social Security: $750,000. Social Security is the biggest lever in retirement income planning — delaying from 62 to 70 can add $1,000–$1,500/month to benefits.
What is sequence of returns risk?
The risk of retiring into a major market decline. If markets drop 30% in your first 1–3 retirement years while you're withdrawing 4%, the portfolio shrinks faster than recovery can offset. Hedge it by holding 1–2 years of cash reserves — so you never have to sell equities during downturns. Draw from cash in bad years; replenish from the portfolio in good years.
Should I use a fixed or flexible withdrawal strategy?
Flexible is generally better for long-term survival. Reducing withdrawals by 10% in significant market downturns meaningfully improves portfolio longevity without major lifestyle impact. Most retirees naturally adopt flexibility — spending less when markets are bad. Fixed (inflation-adjusted 4%) is simpler and works well at moderate withdrawal rates with diversified portfolios.
How does inflation affect retirement income?
Significantly over 20–30 years. At 3% inflation, $5,000/month today buys $3,048 of today's goods in 20 years. The 4% rule accounts for this by adjusting withdrawals upward for inflation annually. Social Security benefits also inflate annually (CPI-W). A 30-year retirement at 3% inflation means your year-30 withdrawal needs to be about 2.4× your year-1 withdrawal to maintain the same real purchasing power.