Years to Financial Independence
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At a 20% savings rate
Progress to Your FI Target
My Path to FI — Financial Depth
financialdepth.com/savings-rate-fi
Quick Summary (TL;DR)
- Your savings rate — not income — is the #1 driver of years to FI.
- Save 10% → ~50 yrs; 50% → ~17 yrs; 65% → ~10 yrs (from $0, 5% real return).
- Target = 25× annual expenses (the 4% rule).
- Cutting expenses helps twice: smaller target and more to invest.
Why Savings Rate Beats Salary
Made famous by Mr. Money Mustache’s "shockingly simple math", this is the most counter-intuitive truth in early retirement: how soon you reach financial independence depends almost entirely on your savings rate — the share of take-home pay you keep — not on how much you earn. A higher savings rate does double duty: it grows your portfolio faster and shrinks the number you need, because you live on less.
The math assumes you need 25× your annual expenses (the 4% rule) and invest the rest at a real return. Save 10% and FI is roughly 50 years away; save 50% and it collapses to about 17; save 65% and it’s closer to 10. That’s why frugality is a lever, not a sacrifice — every percentage point you add to your savings rate pulls your freedom date forward.
Frequently Asked Questions
How does my savings rate affect when I can retire?+
It is the dominant factor. A higher savings rate grows your portfolio faster and lowers the amount you need, so the years to FI fall steeply as your rate rises.
What savings rate do I need to retire in 10 years?+
Roughly 65% of take-home pay at a 5% real return, starting from zero. Lower rates extend the timeline significantly; existing savings shorten it.
Does this assume the 4% rule?+
Yes. It targets 25 times your annual expenses, which corresponds to a 4% safe withdrawal rate — a common starting assumption in the FIRE community.
Key Considerations
- Real return matters — use a conservative one. This model uses a flat real (after-inflation) return. Markets are volatile, so 5–6% is a sensible planning figure rather than the headline ~10% nominal.
- Savings rate is on take-home pay. Define it consistently — ideally savings ÷ after-tax income — and include employer matches and pre-tax contributions for an honest number.
- Expenses in FI may differ from now. Healthcare, taxes, and lifestyle shifts can move your future spending; revisit the number as life changes.