Coaching practices for How to Calculate Coast Fi

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Does this sound like the set of challenges you might be facing?

  • I’m grinding to save as hard as I can, and I want to know the exact point where I could ease off the saving entirely
  • The way I’ve framed it, I’m either free or I’m not, and that one faraway number feels so distant it’s discouraging
  • If you asked me what I spend in a year I’d give you a confident number off the top of my head
  • The full finish line is decades out and that distance just crushes my motivation
  • I’ve been assuming I’ll just spend roughly what I spend now once I stop working, but that can’t be right

Practices that may help

  1. Use Coast FI as a motivating intermediate milestone
    Coast FI is the point where your current portfolio, left alone, will compound to full FI by a traditional retirement age.
    The Financial Independence Number, Made Practical
  2. The Financial Independence Number, Made Practical
    Your financial independence (FI) number is the portfolio size at which investment returns can cover your living expenses indefinitely, typically estimated as 25 times your annual spending (based on a 4% withdrawal rate). It is a planning heuristic rooted in historical return data, not a guarantee — the real work is defining what your life actually costs and deciding what "enough" means for you, which is as much a values question as a math question.
  3. Define multiple FI levels, not just one number
    Lean FI, regular FI, and fat FI give you decision points along the way rather than one all-or-nothing cliff.
    The Financial Independence Number, Made Practical
  4. Calculate your real current spending — not your estimate
    Pull three months of actual bank and card data before calculating your FI number — estimates are reliably too low.
    The Financial Independence Number, Made Practical
  5. Use Coast FI or Barista FI as milestones, not just terminal FI
    Intermediate FI milestones provide motivation and optionality long before full FI is reached.
    Financial Independence, Made Practical
  6. Project how your spending changes in financial independence
    Some expenses disappear at FI (commuting, work clothes), others rise dramatically (healthcare, time-enabled spending) — model both.
    The Financial Independence Number, Made Practical
  7. Understand and apply the 4% rule to set your FI number
    Your FI number is 25 times your annual spending — the level at which historical markets support indefinite withdrawal.
    Financial Independence, Made Practical
  8. Financial Independence, Made Practical
    Financial independence (FI) means your investment portfolio generates enough passive income to cover your expenses without requiring employment income. JL Collins and the FIRE community use the 4% rule as a rough guideline: if annual spending is 4% or less of your portfolio, the portfolio is likely sustainable indefinitely based on historical market data. The timeline to FI depends almost entirely on savings rate, not income level.
  9. Anchor on what you know and scale from there
    Start from a number you are confident about, then reason to the unknown.
    Fermi Estimation
  10. Optimize savings rate, not just investment returns
    Doubling your savings rate compresses your FI timeline far more than chasing higher returns.
    The Financial Independence Number, Made Practical

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