How many years until FIRE?
The levers that move your timeline to financial independence: savings rate, spending, portfolio, and return assumptions.
“Years to FIRE” is the planning question after you know a target nest egg: given what you have, what you save, and what you assume markets return (in real terms), how long might it take to reach financial independence?
The four main levers
- Current invested portfolio — starting capital compounds.
- Annual savings (or savings rate) — usually the lever you control most.
- FIRE target — driven by spending and withdrawal rate.
- Expected real return — powerful, but easiest to over-assume.
Why savings rate dominates
Raising savings often does double duty: more money invested each year and, if spending falls, a lower FIRE number. Assuming a higher return shortens the timeline on a spreadsheet but does not put cash in your brokerage account. Conservative planners stress-test lower returns rather than banking on bull markets.
A worked sketch
Imagine $200,000 invested, $40,000 saved per year, a $1,500,000 target ($60k spend at 4%), and a 5% real return. A constant-return model will show a multi-year path with a growth chart. Change only the savings amount or only the return to see which move changes the finish line more for your situation.
What the model leaves out
- Market volatility and sequence risk
- Career interruptions, raises, and windfalls
- Taxes, fees, and account-type constraints
- Lifestyle changes as you approach FI
Use the free Years to FIRE calculator on RetireFire for an interactive timeline, then cross-check the target with the FIRE Number tool and Methodology notes.