Key Numbers and Analysis
Eight FIRE red flags with risk level and recommended fixes
| Red Flag | Signal | Risk Level | Fix |
|---|---|---|---|
| Using 5% SWR for 40-year retirement | Portfolio failure risk is high | High | Use 3.5% SWR for 40-year horizon |
| Expense estimate never updated | May be 20-30% understated | High | Track actual expenses for 12 months |
| Healthcare not included in budget | Largest FIRE budget underestimate | High | Add $7,000-$20,000/year explicitly |
| No Roth conversion ladder | Penalty on pre-tax access before 59.5 | Medium-High | Start 5-year ladder 5 years before FIRE |
| No cash buffer at FIRE | Sequence-of-returns risk unmitigated | Medium-High | Build 2-3 years of expenses in HYSA |
| FIRE number moving constantly upward | One More Year syndrome developing | Medium | Pre-commit to specific trigger criteria |
| 100% equity allocation at FIRE | Excessive sequence risk at retirement | Medium | Build bond tent starting 5 years before FIRE |
| No inflation adjustment to FIRE number | Under-saved for future costs | Medium | Use real return; model expenses in today’s dollars |
⚠️The SWR Red Flag Is Most Dangerous
Using 5% SWR instead of 3.5% for a 45-year retirement is the most dangerous FIRE calculation error. Historical data shows 5% SWR has a 35% failure rate over 45-year periods — one in three scenarios runs out of money. The correction is simply using 3.5% in your FIRE number calculation.
Scenarios and Comparison
FIRE red flags: consequences of early vs. late correction
| Correctable Red Flag | If Caught Early | If Caught Late |
|---|---|---|
| Wrong SWR | Extend timeline 2-3 years | Already retired — reduce spending or earn income |
| Healthcare underestimate | Increase FIRE number by $200K-$500K | Return to part-time work for benefits |
| No conversion ladder started | Begin immediately; bridge gap with taxable assets | Use Rule 72(t) or build taxable bridge |
| No cash buffer | Build over 2-3 years before FIRE | Use conservative withdrawal strategy |
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