“How much should I save for retirement?” is the most searched retirement question on the internet — and almost every answer you will find gets it wrong.
Mainstream financial advice gives you rules of thumb that sound helpful but collapse under scrutiny: “Save 10-15% of your income.” “Have 1x your salary saved by 30.” “You need $1 million to retire.” These numbers are based on averages, and averages describe nobody’s actual life.
The FI community figured out a better framework decades ago, and the math is elegant in its simplicity: you need 25 times your annual expenses to retire. Not 25 times your income — 25 times what you actually spend. This single insight changes everything, because it means the amount you need to save is entirely within your control.
If you spend $40,000 per year, you need $1,000,000. If you spend $60,000, you need $1,500,000. If you spend $80,000, you need $2,000,000. The formula does not care about your income, your age, or your job title. It cares about one number: your annual spending.
The 4% Rule — Where 25x Comes From
The 25x rule is derived from the 4% safe withdrawal rate, one of the most extensively researched concepts in retirement planning. Developed by financial planner William Bengen in 1994 and validated by the Trinity Study, the 4% rule states that a retiree can withdraw 4% of their portfolio in year one and adjust for inflation each subsequent year, with a historically high probability (95%+) of not running out of money over 30 years.
The math: if you need $50,000 per year and withdraw 4% annually, you need $50,000 ÷ 0.04 = $1,250,000. That is the same as $50,000 × 25.
Age-Based Benchmarks: Fidelity’s Guidelines vs FI Reality
Fidelity publishes widely-cited age-based savings milestones:
| Age | Fidelity Benchmark | FI Community Benchmark |
|---|---|---|
| 30 | 1x salary saved | Know your FI number, savings rate above 25% |
| 35 | 2x salary saved | 25-40% of FI number accumulated |
| 40 | 3x salary saved | 40-60% of FI number, compound growth accelerating |
| 45 | 4x salary saved | 60-80% of FI number, FI date visible |
| 50 | 6x salary saved | At or approaching FI |
| 55 | 7x salary saved | Many FI seekers already retired |
| 60 | 8x salary saved | Traditional retirement age approaching |
| 67 | 10x salary saved | Standard retirement |
Fidelity’s benchmarks are based on salary, which is the wrong variable. Two people earning $100,000 can have wildly different needs: one spends $80,000 and needs $2M to retire; the other spends $40,000 and needs $1M. Salary-based benchmarks tell the second person they are behind when they are actually ahead.
The FI community replaces salary-based milestones with a single metric: your FI percentage — how much of your 25x target you have accumulated. At 50%, you are halfway. At 100%, you are financially independent. It is that simple.