Most Americans Are Far Behind — Here's the Benchmark
Fidelity's retirement savings benchmarks suggest having 1x your salary by 30, 3x by 40, 6x by 50, 8x by 60, and 10x by retirement. The median 55–64-year-old American has about $185,000 saved — roughly 2x the typical salary at that age, a $600,000+ shortfall from the 8x target. Understanding the math early is the only way to avoid that gap.
The 4% Rule: Your Retirement Number Foundation
The 4% rule (from the Trinity Study) states that a portfolio of 50–75% stocks can sustain inflation-adjusted withdrawals of 4% per year for at least 30 years with very high historical success rates.
Your retirement number = annual expenses × 25
Examples:
- Spend $40,000/year → need $1,000,000
- Spend $60,000/year → need $1,500,000
- Spend $80,000/year → need $2,000,000
- Spend $100,000/year → need $2,500,000
Important: these are expenses, not income. Social Security offsets some of this — a benefit of $2,000/month ($24,000/year) reduces your portfolio requirement by $600,000 (24,000 × 25).
Calculating How Much to Save Each Month
Using the future value of annuity formula to figure out the required monthly contribution:
PMT = FV × r / [(1 + r)^n − 1]
Scenario: Need $1,500,000 in 25 years, expect 7% annual return (monthly compounding):
- r = 7% ÷ 12 = 0.5833%
- n = 25 × 12 = 300
- (1.005833)^300 = 5.427
- PMT = $1,500,000 × 0.005833 / (5.427 − 1) = $8,750 / 4.427 = $1,977/month
If you already have $200,000 saved, the future value of that sum reduces the target: $200,000 × 5.427 = $1,085,400. New target from savings alone: $1,500,000 − $1,085,400 = $414,600. Monthly needed: $414,600 × 0.005833 / 4.427 = $546/month. Having savings already dramatically reduces the required monthly contribution.
Savings Rate by Starting Age
To accumulate $1,500,000 by age 65 with 7% returns and no prior savings:
| Starting Age | Years | Monthly Contribution Needed | Total Contributed |
|---|---|---|---|
| 25 | 40 | $643 | $308,640 |
| 30 | 35 | $975 | $409,500 |
| 35 | 30 | $1,491 | $536,760 |
| 40 | 25 | $1,977 | $593,100 (but needs $1,500,000) |
| 45 | 20 | $2,930 | $703,200 |
Starting at 25 vs. 35 requires saving less than half as much per month to reach the same goal. The 10-year delay nearly triples the required monthly savings.
Beyond the 4% Rule: Adjusting for Your Situation
Retire Early (Before 65)
The 4% rule was tested over 30-year periods. A 40-year-old retiring early needs a portfolio to last 50+ years. Research suggests using 3.5% or even 3.25% withdrawal rate for extra safety (multiply by 29–31x instead of 25x).
Adjust for Sequence-of-Returns Risk
A market crash in the first 5 years of retirement can devastate a portfolio even if long-run returns are fine. Mitigations include: holding 2 years of expenses in cash/short bonds, using a flexible withdrawal strategy (spend less in down years), and delaying Social Security to maximize guaranteed income.
Healthcare Costs
Fidelity estimates the average 65-year-old couple needs $315,000 in savings just for healthcare costs in retirement (not covered by Medicare). Budget separately for this or add $315,000 to your retirement target.
Tax-Advantaged Account Limits (2025)
- 401(k): $23,500/year ($31,000 if age 50+)
- IRA (Traditional or Roth): $7,000/year ($8,000 if age 50+)
- HSA: $4,300 individual / $8,550 family — triple tax advantage
- SEP-IRA (self-employed): Up to $70,000 or 25% of compensation
Maxing a 401(k) and IRA gives you $30,500/year in tax-advantaged space — at 7% returns for 30 years, that grows to over $3 million.
Bottom Line
Your retirement number is not a mystery — it's your expected annual spending multiplied by 25, reduced by guaranteed income sources like Social Security. Calculate it today, model the monthly savings required, and use the CalcPeek investment calculator to see exactly how your current savings rate projects against your target. The math is more actionable than most people realize.