Many office workers live with the question, "When will I finally be able to quit?" However, simply having a goal like "I need to save a lot of money" isn't enough to ease that anxiety. What matters is seeing the actual numbers: how long your assets can sustain your cost of living after retirement. The recently added 'FIRE Simulator (Retirement Calculator)' on Jay-Project provides a visual answer to this very question.
1. What is the FIRE Simulator?
The 'Retirement Simulator' is a tool that predicts asset flow over the coming decades by taking your current assets, future savings plans, and expected post-retirement expenses. Rather than just listing numbers, it helps you grasp the 'Accumulation Phase' (growing assets) and the 'Withdrawal Phase' (using assets) at a glance through charts.
2. Key Variables for Simulation
To build an accurate retirement plan, you must carefully set the following four elements:
① Monthly Savings Before Retirement
This is the amount you can consistently invest each month after subtracting expenses from your income. The larger this amount, the larger your principal at retirement, maximizing the magic of compound interest.
② Expected Monthly Expenses After Retirement
The amount you will withdraw from your assets each month after retiring. It is best to be conservative, accounting not just for current living costs but also potential medical bills or leisure activities in old age.
③ Expected Annual Rate of Return
The average return you expect to earn by managing your assets. If you invest long-term in index-tracking ETFs like the S&P 500, you can set a reasonable rate based on historical statistics.
④ Years Remaining Until Retirement
The number of years from now until you transition to a full-time investor or retiree. The shorter this period, the more critical your current asset size and rate of return become.
3. Interpreting Results: Asset Depletion vs. Financial Freedom
The most important thing to watch in the simulation results is the asset trajectory.
- Downward Trend to Depletion: If withdrawals after retirement exceed investment returns, your assets will eventually head toward zero. The simulator predicts "in how many years your assets will be depleted," allowing you to delay retirement or adjust your expenses.
- Upward Trend or Stability: If your total assets stay the same or even grow despite continuous withdrawals for living expenses, you have reached a state of perfect 'Financial Freedom.'
4. Strategies for a Successful Retirement
- Refer to the 4% Rule: A theory suggesting that if you withdraw only 4% of your assets annually, they will not be depleted. Use the simulator to see if this ratio works for you.
- Take a Conservative Approach: It is safer to plan for the worst-case scenario by setting slightly lower returns and slightly higher expenses.
- Check Periodically: Market conditions and personal circumstances change constantly. Use the new tools updated in the Notice section to refine your plan periodically.
Conclusion
Retirement isn't just about quitting your job; it's a new beginning where your assets start working for you. Instead of vague guesses, gain data-driven confidence through the FIRE Simulator. A plan confirmed by numbers will make your today much more confident.