Key Takeaway: Use the 4% rule — multiply your annual expenses by 25. For a $50K/year lifestyle, you need $1.25M. For $80K/year, you need $2M. Social Security adds $1,500–3,500/month on top. Healthcare is the #1 hidden cost — budget $300K–500K per couple for lifetime medical expenses.
The 4% Rule Explained
The 4% rule is the most widely used framework for estimating retirement needs. It says: withdraw 4% of your portfolio in year 1, then adjust that amount for inflation each year. Historical backtesting shows this withdrawal rate has a 95%+ success rate for 30-year retirements. Example: You have a $1,000,000 portfolio. • Year 1 withdrawal: $40,000 (4%) • Year 2 (3% inflation): $41,200 • Year 3: $42,436 • Year 10: $53,760 The portfolio keeps growing 6–8% annually on average, outpacing your withdrawals, so the balance stays roughly stable in real terms. The 4% rule isn't perfect. It was derived from US market data (1926–1994) and doesn't account for today's higher valuations, longer lifespans, or lower expected returns. Many planners now recommend 3.5% for safety, especially if retiring early (40–50 year horizon instead of 30). For this article, we'll use 4% as the baseline but flag where a lower rate might be more appropriate.
Your Retirement Number by Lifestyle
The formula is simple: Annual expenses × 25 = Your retirement number. Here's what different lifestyles require: Lean Retirement ($30,000–40,000/year): • Retirement number: $750K–$1M • Lifestyle: Frugal, one car, cooking at home, budget travel • Feasible in low-cost states (Mississippi, Arkansas, Oklahoma) • Assumes Medicare + supplemental coverage Comfortable Retirement ($50,000–60,000/year): • Retirement number: $1.25M–$1.5M • Lifestyle: Middle-class, own home, occasional dining out, one annual vacation • Works in most states except expensive coastal metros Upper-Middle Retirement ($80,000–100,000/year): • Retirement number: $2M–$2.5M • Lifestyle: Nice home, new car every 5 years, international travel, hobbies • Comfortable even in expensive states Luxury Retirement ($150,000+/year): • Retirement number: $3.75M+ • Lifestyle: Multiple properties, luxury travel, premium everything • High-end coastal living (Hawaii, coastal California, Manhattan) Notice that the multiplier stays the same — 25x — regardless of lifestyle. Only the annual expense assumption changes. This makes the math flexible: whatever your target annual spend, multiply by 25.
Don't Forget Social Security
Social Security is a critical part of the retirement equation, and it's often ignored in FIRE calculations. It shouldn't be — for the average American couple, Social Security covers 30–40% of retirement expenses. Average monthly benefit by claim age (2025): • Age 62 (early): ~$2,000/month per person • Age 67 (full retirement age): ~$2,800/month per person • Age 70 (delayed): ~$3,500/month per person For a couple claiming at 67, that's $5,600/month = $67,200/year in combined benefits — indexed to inflation for life. Sample calculation: • Target annual expenses: $70,000 • Social Security (couple at 67): $67,200 • Need from portfolio: $2,800 • Retirement number: $2,800 × 25 = $70,000... barely anything! But wait — you can't claim Social Security until 62, and full benefits only at 67. If you retire at 55, you need to bridge 7–12 years without Social Security. This is where the 4% rule gets more complicated for early retirees. A common framework: build a separate bridge fund (7 years of expenses in cash/bonds) to cover the gap, and let your main retirement portfolio compound untouched until Social Security kicks in.
The Healthcare Bomb
Healthcare is the single biggest retirement expense that people underestimate. Fidelity's annual Retiree Health Care Cost Estimate puts lifetime healthcare costs for a 65-year-old couple at $315,000–$400,000 (in today's dollars) — and that's just premiums and out-of-pocket costs, not long-term care. Before Medicare (age 62–64): • Private insurance: $1,500–2,500/month per couple • ACA marketplace: $500–1,500/month (with subsidies) • Annual budget: $15,000–30,000 After Medicare (age 65+): • Medicare Part B premium: ~$185/month per person • Medicare Part D (drugs): ~$50/month per person • Medigap supplemental insurance: ~$200/month per person • Out-of-pocket (dental, vision, copays): $2,000–4,000/year • Total: ~$8,000–10,000/year per person Long-term care (if needed): • Nursing home: $90,000–120,000/year • Assisted living: $50,000–80,000/year • In-home care: $30,000–60,000/year Roughly 70% of Americans will need some form of long-term care during their lifetime. For those who need it for multiple years, costs can wipe out a retirement portfolio. Long-term care insurance or a dedicated HSA fund mitigates this risk.
State-by-State Retirement Costs
Where you live dramatically affects how much you need. Annual expense estimates for a comfortable retiree lifestyle: Most expensive states: • Hawaii: $100,000+/year • California (coastal): $90,000+/year • Massachusetts: $85,000+/year • New York (metro): $85,000+/year • Connecticut: $80,000+/year Most affordable states: • Mississippi: $40,000/year • Arkansas: $42,000/year • Oklahoma: $43,000/year • Missouri: $44,000/year • Alabama: $44,000/year Best balance (affordable + quality of life): • Florida: $55,000/year (no state income tax, warm weather) • Texas: $50,000/year (no state income tax, diverse metros) • Tennessee: $48,000/year (no income tax, low cost) • Arizona: $52,000/year (warm, growing cities) • Nevada: $53,000/year (no income tax, Vegas/Reno amenities) Choosing a low-cost state can reduce your required retirement number by $500K–$1M, effectively accelerating retirement by 5–10 years. Many retirees deliberately relocate in their late 50s to capture this advantage.
The 401(k) + IRA Strategy for Building the Number
Once you know your target, the build phase is straightforward. Here's the optimal order of operations: Step 1: Max the 401(k) employer match. A 50% match on 6% of salary is an instant 50% return. Never skip this. Step 2: Max a Roth IRA ($7,000 in 2026). Tax-free growth and withdrawals. No RMDs during lifetime. Highest flexibility of any retirement account. Step 3: Max the 401(k) ($23,500 in 2026). Reduces current taxable income at your marginal rate. Best for high earners. Step 4: HSA (if you have a high-deductible health plan). Triple tax advantage — the only account in the US tax code with that feature. 2025 limits: $4,300 individual / $8,550 family. Step 5: Taxable brokerage. Index funds (VTSAX, VTI, VOO). No contribution limits. Full flexibility. A household earning $150,000/year can save $60,000+ in tax-advantaged accounts plus more in a taxable brokerage. Doing this consistently for 25 years at 8% returns produces $2M+ in retirement assets.
How Much to Save by Age
Fidelity's widely-cited retirement savings milestones provide a simple reality check: • Age 30: 1× annual salary saved • Age 35: 2× annual salary saved • Age 40: 3× annual salary saved • Age 45: 4× annual salary saved • Age 50: 6× annual salary saved • Age 55: 7× annual salary saved • Age 60: 8× annual salary saved • Age 67: 10× annual salary saved Example on an $80,000 salary: • Age 30: $80K saved • Age 40: $240K saved • Age 50: $480K saved • Age 60: $640K saved • Age 67: $800K saved Add Social Security ($30K/year for the couple) plus a 4% withdrawal from the $800K portfolio ($32K) and you get ~$62K/year in retirement income — a comfortable middle-class standard in most states. If you're behind: The catch-up mechanisms are powerful. From age 50, 401(k) limits increase by $7,500/year ($31,000 total). Between 60 and 63, the SECURE 2.0 Act adds an even higher 'super catch-up' of $11,250/year. Maxing these for 10–15 years can meaningfully close the gap.
Early Retirement (FIRE)
If you want to retire at 40–50 instead of 67, the math changes dramatically: Required savings rate: • 30% savings rate: 28 years to retirement • 40% savings rate: 22 years • 50% savings rate: 17 years • 60% savings rate: 12.5 years • 70% savings rate: 8.5 years Early retirement's unique challenges: • No Social Security until 62. You need a bridge fund of 10–20 years of expenses, separate from your main portfolio. • No Medicare until 65. Healthcare costs $15,000–30,000/year for a couple using ACA marketplace insurance. • Longer time horizon. A 45-year retirement requires more conservatism than a 25-year one. Use 3.5% withdrawal rate, not 4%. • Sequence-of-returns risk. A market crash in your first 5 years of retirement is far more damaging than one in year 20. Keep 2–3 years of expenses in cash/bonds as a buffer. FIRE number: Annual expenses × 28.5 (using 3.5% withdrawal rate). For a $60,000 lifestyle, that's $1.71M instead of $1.5M — a 14% higher target than the standard 4% rule.
Frequently Asked Questions
Is the 4% rule still valid in 2026?
For 30-year retirements, roughly yes. For longer retirements (40+ years) or early retirement, use 3.5% or even 3.25% to be safe. Market valuations today are higher than historical averages, which reduces expected future returns. The 4% rule was derived from data where P/E ratios were lower on average.
Should I count my home equity in my retirement number?
Generally no, unless you plan to sell or downsize. A paid-off home eliminates rent or mortgage (a big expense reduction), but it doesn't generate cash for other spending. Count home equity only if you're confident you'll monetize it — downsizing, reverse mortgage, or selling to rent.
What if I live to 100?
Plan for it. With modern healthcare, a 65-year-old today has a 30–40% chance of living past 90. Use a 3.5% withdrawal rate instead of 4%, and consider longevity insurance (a deferred income annuity starting at age 85). A 40-year retirement is the realistic planning horizon, not 25.
How does inflation affect my retirement number?
Dramatically. A $50,000 lifestyle today becomes $90,000 in 20 years at 3% inflation, and $180,000 in 20 years at 6% inflation. The 4% rule already accounts for 2–3% inflation by indexing withdrawals. If you're modeling in nominal dollars, adjust for inflation explicitly.
What's the best way to close a retirement savings gap?
Three levers: save more, work longer, or spend less. Working an extra 3 years typically reduces your required portfolio by 20%+ because you contribute longer and withdraw less. Saving 5% more of income accelerates your timeline by 3–4 years. Reducing retirement spending by 20% cuts the required portfolio by 20%.
Does Social Security count as part of my portfolio?
No, but it reduces what your portfolio needs to provide. Social Security is a government-backed income stream, separate from your invested assets. When calculating your target, first subtract expected Social Security income from your annual expenses — the remainder is what your portfolio must cover.
Is $1 million enough to retire in the US?
For a frugal single person in a low-cost state, yes. For a couple in a mid-cost state, marginal. For a family in a coastal metro, no. $1M generates $40,000/year at a 4% withdrawal rate — below the median US household income. Most retirees need $1.5M–$2.5M for a comfortable lifestyle, plus Social Security.
How often should I recalculate my retirement number?
Once a year, or after major life changes. Marriage, children, a big promotion, or a shift to part-time work all change your target. An annual review during tax filing is a good habit. The math gets more precise the closer you get to retirement.
Bottom Line
How much you need to retire comes down to one number: your annual expenses multiplied by 25 (or 28.5 for early retirement). The bigger your lifestyle, the larger the target. Social Security covers 30–40% for most retirees; the rest must come from your portfolio. Healthcare is the wildcard — budget $300K–500K for a couple's lifetime medical costs. Choose your retirement state strategically; the difference between coastal California and inland Florida can be $500K–$1M in required savings. Build the corpus in the optimal order: 401(k) match, Roth IRA, 401(k), HSA, taxable brokerage. And remember: retirement isn't just a number — it's a phase of life that lasts 25–40 years. Plan with the same care you'd give to any other 30-year commitment.