How Much Do You Really Need to Retire?

Asking "how much do I need to retire" is like asking "how big a house do I need." The answer depends entirely on what you're comparing against. Here's the framework that actually produces a number you can plan around.

The four variables

Your retirement number depends on four things:

1. How much you'll spend per year in retirement
2. How many years you'll be retired
3. What other income you'll have
4. What rate of return you assume

Get all four reasonably right and you have a real number. Estimate any of them wildly wrong and the whole calculation is meaningless.

Step 1: Estimate annual retirement spending

The classic rule is "70-80% of your pre-retirement income." This is wrong for most people. Better: take your current spending, subtract things that go away (mortgage if paid off, work expenses, retirement contributions, kids if independent), and add things that increase (healthcare, travel, hobbies).

Common scenarios:

• Modest retirement: $35,000-50,000/year. Smaller home, less travel, careful spending.
• Comfortable retirement: $55,000-80,000/year. Travel, hobbies, eating out, occasional splurges.
• Affluent retirement: $90,000-150,000/year. Multiple homes, frequent international travel, generous gifts.
• Wealthy retirement: $150,000+/year. Few constraints.

Your number depends on your expected lifestyle. There's no universal answer.

Step 2: Estimate retirement length

If you retire at 65 and live to 90, that's 25 years. If you retire at 50, you might need 40+ years of funding. If you retire at 35 (FIRE-style), maybe 50+.

People consistently underestimate how long they'll live. Modern actuarial tables suggest planning for at least age 95 if you're healthy at 65. Running out of money at 87 is a real risk that's worth a few extra years of planning headroom.

Step 3: Subtract other income

Most retirees aren't 100% portfolio-funded. Other sources include:

• Social Security: Average benefit in 2026 is around $1,950/month ($23,400/year). Higher earners get more, capped around $4,800/month if you delay to age 70.
• Pensions: Government workers, teachers, military, some private-sector roles.
• Rental income: If you own property.
• Part-time work: Many "retirees" work 10-20 hours a week for income and engagement.
• Annuities: Less common but possible.

Your portfolio only needs to fund the gap between annual spending and these other income sources.

Step 4: Apply a withdrawal rate

The classic 4% rule says you need 25× your annual portfolio withdrawal. So if you need your portfolio to provide $40,000/year, you need $1,000,000.

For longer retirements (early retirees), use 3.3%, that's 30× your annual withdrawal.

The example math

Let's calculate for a 35-year-old planning to retire at 65:

1. Expected annual spending in retirement: $65,000 (in today's dollars).
2. Social Security at 67: $25,000/year.
3. Gap to fund: $65,000 - $25,000 = $40,000/year.
4. Portfolio needed (25×): $1,000,000.

So this person needs $1 million in retirement accounts (in today's dollars) by age 65. Adjusting for inflation over 30 years at 3%, they'd need about $2.4 million in actual dollars at retirement.

To reach $1 million in 30 years at 7% real return, they need to save about $850/month consistently. That's the actionable number.

The "rough check" shortcuts

Don't want to do the full calculation? Use these approximations based on age and salary:

• By 30: 1× annual salary saved
• By 35: 2× salary
• By 40: 3× salary
• By 45: 4× salary
• By 50: 6× salary
• By 55: 7× salary
• By 60: 8× salary
• By 67: 10× salary

These Fidelity benchmarks assume you'll work to 67, take Social Security, and want to maintain your pre-retirement lifestyle. Adjust up if you want to retire earlier or maintain a higher lifestyle.

The variables you control

Three levers affect your retirement number more than anything else:

1. Lower your retirement spending. Every $10,000/year you cut from retirement spending reduces your needed portfolio by $250,000.
2. Work an extra year. Each extra year of working both increases savings and reduces the years you need to fund.
3. Increase your savings rate. 1% more saved per year for 30 years adds enormously to the final number.

The hardest truth

Most Americans approach retirement under-prepared. The median 401(k) balance for people aged 55-64 is around $90,000 in 2026, a fraction of what they actually need. The fix isn't a magic strategy; it's starting earlier, saving more consistently, and adjusting expectations downward if needed.

Calculate your number this week. Then start moving toward it, however slowly. The compound math means even small contributions today are far more valuable than larger ones a decade from now. See compound interest.