Savings Rate to Financial Independence
Example: Annual after-tax income: 80000 $ · Annual expenses: 56000 $ · Expected annual investment return: 7 % · Safe withdrawal rate: 4 %
| Years to financial independence | 25 |
| Your savings rate | 30.00% |
| Your FI number | $1,400,000 |
| Annual savings | $24,000 |
Worked example
Earning $80,000 after tax and spending $56,000 means you save $24,000 per year — a 30% savings rate. At a 7% return and 4% withdrawal rate, your FI number is $1,400,000, and you will reach it in approximately 24 years. Raise your savings rate to 50% by cutting spending to $40,000 and you hit FI in roughly 16 years — eight years sooner.
Frequently asked questions
What is the 4% safe withdrawal rate?
The 4% rule comes from the Trinity Study (1998), which found that a 4% annual withdrawal from a balanced stock-bond portfolio survived 30-year retirement periods in 95% of historical scenarios. More recent research suggests 3.3%–3.7% may be more reliable for 40–50 year retirements. The rate you choose determines your FI number: lower withdrawal rate = larger nest egg needed.
Should I use after-tax or gross income?
Use after-tax (take-home) income for the most accurate picture, since that is the money you actually manage. If you include 401k contributions in your savings, add them back to both income and savings — they are real savings even though they never hit your bank account. The key is consistency: use the same definition for both income and expenses.
Does starting savings balance matter?
Yes — this calculator assumes you are starting from zero. If you already have savings, the years-to-FI will be lower. Use the Coast FIRE calculator to see how your existing savings affect the timeline and whether you have already earned the right to coast.