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Coast FIRE — Investments Do the Heavy Lifting

Downshifted at 33, letting $350k grow untouched

Age

33

Location

Portland, OR

Income

$75k/yr (reduced)

Saved

$350k

A 33-year-old Portland professional dropped from a $135k job to a $75k lower-stress role. Their $350k already invested should compound to a comfortable retirement figure by their 50s — no additional contributions strictly required. This scenario tests whether "coasting" is mathematically sound or wishful thinking.

What the projection shows

The earliest retirement age at which this plan does not run out of money is 55, after 22 more years of full-time work. Market risk matters more than that headline: the earliest age that succeeds in at least 80% of 500 Monte Carlo simulations is 56.

Retirement age options for Coast FIRE — Investments Do the Heavy Lifting
Retire atFull-time years leftSemi-retired yearsBest Monte Carlo success
5522066%
5623081%
6027093%

How the plan works (retiring at 56)

EARLIEST 80%+ PLAN: Retire at Age 56 Switch to semi-retirement at age 56 (after 23 high-salary years). Portfolio bridges to full retirement at 56.

Growth rate (4.0%) keeps compounding during spending — the extra buffer matters most against bad early-retirement market sequences.

Social Security: $22k/yr starting at age 67 is included. Healthcare: $12k/yr before Medicare at 65.

Portfolio range over time

Across the simulated market histories (in future dollars, not adjusted for inflation), the median portfolio is $963k at 70, $982k at 80, $951k at 90. In a poor sequence of returns (10th percentile) it is $0k at 70, $0k at 80, $0k at 90.

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This example uses illustrative figures and should not be treated as financial advice.