Retiring at 50 sounds appealing. In Switzerland, France, Germany, and most of Europe, there's a catch: your state pension doesn't start until 64–67. That's a 14–17 year gap where your portfolio is the only income. Bridge FIRE is the strategy built for exactly this situation.
What is Bridge FIRE?
Bridge FIRE splits your retirement into two distinct phases:
Bridge phase
From your retirement date until your pension starts. Your portfolio covers 100% of expenses. This is the most demanding phase — and the one most people underestimate.
Pension phase
Once your state pension begins, it offsets a portion of your expenses. Your portfolio withdrawals drop dramatically — and it can often last indefinitely from this point.
A worked example
Let's say you're 38 years old, living in Switzerland, with these parameters:
| Current age | 38 |
| Target retirement age | 50 |
| AHV pension starts | 65 (bridge = 15 years) |
| Monthly expenses | CHF 5,500 (CHF 66,000/yr) |
| Expected AHV pension | CHF 28,000/year |
| Current portfolio | CHF 120,000 |
| Monthly savings | CHF 4,000 |
During the bridge phase, the portfolio must cover the full CHF 66,000/year. That's the hard part. From age 65, the pension covers CHF 28,000/year — so only CHF 38,000/year needs to come from the portfolio. The pension phase is much less demanding; a well-funded portfolio often survives indefinitely from that point.
How to calculate the bridge portfolio
The traditional FIRE calculation (25× annual expenses) ignores the pension phase entirely and overestimates the required portfolio. Bridge FIRE uses a full year-by-year simulation instead.
The FireClarity Bridge calculator runs the complete simulation: it projects portfolio growth during accumulation, then models the drawdown during the bridge phase and the reduced drawdown during the pension phase — including investment growth at every step. The result is the minimum portfolio you need at retirement, not an overestimate.
Bridge vs Traditional FIRE: a real difference
In the example above, Traditional FIRE would require CHF 1,650,000 (25× CHF 66,000). Bridge FIRE with a CHF 28,000/year AHV pension can work with significantly less — because the pension reduces withdrawals for 25+ years of the simulation. The exact number depends on return assumptions, but the portfolio gap can be hundreds of thousands of francs.
The biggest risks in Bridge FIRE
Sequence-of-returns risk is amplified
A severe market crash in the first years of the bridge phase is harder to survive than later, because there's no pension income yet to soften the blow. The Monte Carlo simulation in FireClarity explicitly models this.
Underestimating bridge-phase expenses
Many people spend more in early retirement than later — travel, hobbies, and home projects all peak in the first decade. Model your bridge-phase expenses generously.
Pension entitlement gaps
In many countries, early retirement reduces your state pension. In Switzerland, AHV contributions stop when you stop working — which can reduce your eventual pension unless you make voluntary contributions. Check the specific rules for your country.
Tips for a robust Bridge FIRE plan
- →Target a safety rating of "Safe" or better — don't plan to just barely survive the bridge.
- →Model a realistic AHV/pension estimate, accounting for any contribution gaps during early retirement.
- →Add modest part-time income in the income streams — even CHF 1,000/month in consulting work dramatically extends the bridge.
- →Run Monte Carlo. A plan that succeeds deterministically but has a 60% Monte Carlo success rate is fragile.
- →Use the break-point analysis to understand your margin — how much earlier could you retire? How much more could you spend?
Model your bridge plan
Enter your retirement age, pension age, expenses, and portfolio. Get a full year-by-year simulation including Monte Carlo analysis.
Open Bridge FIRE Calculator →