Consider two individuals, Alex and Ben, each earning $50,000 per year. Alex saves 40% of their income, while Ben saves 10%. To calculate their retirement timelines, we'll assume they both aim to replace 80% of their pre-retirement income, which is $40,000 per year, and earn a 7% annual return on their investments.
We can calculate the amount needed for retirement using the 25x rule (save 25 times your annual expenses). For Alex and Ben, this would be $1,000,000 (25 * $40,000).
Retirement Timelines for Alex and Ben
To calculate their retirement timelines, we'll use the following formula: Total Amount Needed / Annual Savings = Number of Years to Retirement. For Alex, the annual savings would be $20,000 (40% of $50,000), and for Ben, it would be $5,000 (10% of $50,000).
Using this formula, we can calculate their retirement timelines as follows:
- Alex: $1,000,000 / $20,000 = 50 years. However, since Alex starts saving at age 25, they will reach their retirement goal at age 25 + 50 - 25 (since they've already saved for 25 years) = 50 years old, but this calculation is incorrect because it doesn't take into account the power of compounding. Let's redo it with a more accurate method.
- Ben: $1,000,000 / $5,000 = 200 years. Again, this is an oversimplification. We need to account for the 7% annual return on their investments.
A more accurate way to calculate their retirement timelines would be to use a year-by-year balance table. Let's assume they both start saving at age 25.
Year-by-Year Balance Table for Alex and Ben
Here's a simplified example of how their savings might grow over time, assuming a 7% annual return:
| Year | Alex's Balance | Ben's Balance |
|---|---|---|
| 25 | $0 | $0 |
| 26 | $20,000 * 1.07 = $21,400 | $5,000 * 1.07 = $5,350 |
| 27 | $21,400 + $20,000 = $41,400 * 1.07 = $44,318 | $5,350 + $5,000 = $10,350 * 1.07 = $11,072.50 |
| 28 | $44,318 + $20,000 = $64,318 * 1.07 = $68,800.26 | $11,072.50 + $5,000 = $16,072.50 * 1.07 = $17,187.48 |
Continuing this pattern, we can see that Alex reaches their retirement goal of $1,000,000 at around age 44, while Ben reaches it at around age 67.
This calculation demonstrates the significant impact of savings rate on retirement timelines. By saving 40% of their income, Alex is able to retire 23 years earlier than Ben, who saves only 10%.
To determine your own savings rate, you can use the Freedom Calculator, which provides a straightforward way to calculate your savings rate and estimate your retirement timeline based on your income, expenses, and savings.
For example, if you earn $60,000 per year and save $18,000, your savings rate would be 30% ($18,000 / $60,000). This information can help you make informed decisions about your financial strategy.
Increasing your savings rate, even by a small percentage, can significantly impact your retirement timeline. Consider the following example:
Effect of Boosting Savings Rate
Suppose you currently save 20% of your income, but you want to increase it to 25%. To calculate the impact of this change, you can use the following steps:
- Calculate your current annual savings: $50,000 * 0.20 = $10,000
- Calculate your new annual savings: $50,000 * 0.25 = $12,500
- Calculate the difference in annual savings: $12,500 - $10,000 = $2,500
- Calculate the number of years it would take to reach your retirement goal with the increased savings rate: $1,000,000 / $12,500 = 80 years. Again, this is an oversimplification. Using a more accurate method, such as a year-by-year balance table, we can see that increasing your savings rate from 20% to 25% can result in retiring around 5 years earlier.
By saving an additional 5% of their income, an individual can retire significantly earlier, underscoring the importance of prioritizing savings rate over income alone.
A high savings rate is the primary driver of early retirement, as it enables individuals to accumulate wealth more rapidly and achieve financial independence sooner.
New to FIRE (Financial Independence, Retire Early)? See our primer at https://freedomcalc.app/what-is-fire.
As we can see from Alex and Ben's examples, a high savings rate can lead to a significantly earlier retirement, even on a modest income.
Tools worth looking at
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- Empower — Free net worth tracking, portfolio analysis, and retirement planner. The dashboard serious FIRE chasers actually use.
- Acorns — Round-ups that invest your spare change automatically. The lowest-friction way to start investing if you have been putting it off.
- Wealthfront — Tax-loss harvesting, a 5% cash account, and direct indexing once you cross $100k. Solid robo for the set-and-forget crowd.