The Core Rules That Work
Core 403(b) rules of thumb for 2025 — and when to ignore them
| Rule of Thumb | The Simple Version | When It Breaks Down |
|---|---|---|
| Save 10–15% including match | Total employer + employee = at least 10% | Starting after 40 — need 15–20% |
| 1× salary saved by 30 | Balance should equal annual salary at 30 | High-debt or late-start situations |
| 10× salary saved at retirement | $70K salary = $700K at retirement target | Pension income reduces this need |
| 110 minus age = stock % | Age 40: 70% stocks, 30% bonds | Pension holders can be more aggressive |
| 4% safe withdrawal rate | Withdraw 4% of balance annually | 30+ year retirements may need 3.3% |
| Always capture the full match | Never contribute less than match threshold | High-fee plans may justify IRA instead |
The 15% Rule: Most Versatile Starting Point
The 15% total savings rate (employee + employer contributions combined) is the most research-backed starting point for retirement. On a $72,000 salary with a 3% match, 15% total means contributing 12% yourself — $8,640/year. Over 30 years at 7%, that produces $816,000 — sufficient for most moderate retirement lifestyles.
If your employer matches 3%, you only need to contribute 12% personally to hit the 15% total rule. On $72,000, that is $8,640 — or $720/month from your paycheck.
The Benchmark Rules by Age
Fidelity-derived savings benchmarks by age — all retirement accounts combined
| Age | Balance Benchmark (× salary) | Example: $65K Salary | On Track If... |
|---|---|---|---|
| 30 | 1× | $65,000 | $50,000–$80,000 |
| 35 | 2× | $130,000 | $100,000–$160,000 |
| 40 | 3× | $195,000 | $150,000–$240,000 |
| 50 | 6× | $390,000 | $300,000–$480,000 |
| 60 | 8× | $520,000 | $400,000–$640,000 |
| 65 | 10× | $650,000 | $500,000–$800,000 |
When the Rules Break Down
Rules of thumb fail most often when: you have a pension (dramatically reduces required savings), you started very late (need higher rates), you plan to retire early (need bigger buffer), or your spending in retirement will differ significantly from your current lifestyle. A teacher with a $35,000 annual pension needs far less in her 403(b) than someone without one.
The 1% More Rule
The simplest and most actionable rule: increase your contribution by 1% each time you get a raise. This single habit, applied consistently, takes a 5% contributor to 12% in seven years — all without a significant lifestyle change. On $70,000, 1% more is $58/month before taxes — roughly the cost of two dinners out.
Check Your Numbers Against the Rules of Thumb
Enter your salary and current balance to see whether you are on track by the standard benchmarks.