Pat & Alex Thompson

FIRE couple, mid-30s

Discovered their 4% withdrawal plan had a 31% failure rate — restructured to a guardrails strategy with 94% confidence.

The challenge

Pat and Alex had hit their FIRE number on paper — $1.8M in taxable and retirement accounts, a paid-off house, and annual spending of $72K. The standard 4% rule said they could retire. But every safe-withdrawal calculator they tried gave them a single pass/fail verdict, with no sense of how close to the edge they actually were.

How they used Horizons

1Loaded 24 years of expected spending into the Monthly Budget, including healthcare-before-Medicare and two planned international trips per year.
2Ran a baseline 2,000-trial Monte Carlo at a fixed 4% inflation-adjusted withdrawal and saw the success rate fall to 69%.
3Built a second scenario using Horizons' Guardrails withdrawal strategy — spending flexes ±10% based on portfolio performance.
4Compared both scenarios side by side in the What-If view and checked sequence-of-returns risk in the first five years of retirement.

The outcome

Baseline 4% plan: 69% probability of success, with a bottom-decile portfolio running dry by year 31.
Guardrails plan: 94% probability of success, with a worst-case drawdown of 22% in their first decade.
Median ending net worth at age 90: $3.1M under guardrails vs $1.1M under fixed 4%.
They pulled the trigger on early retirement six months later, with a written spending rulebook derived from the simulation.

“Every other retirement calculator told us 'yes' or 'no.' Horizons showed us that our plan had a 31% chance of failing — and then let us model a better one in an afternoon. It's the first tool that felt honest about uncertainty.”
— Composite profile of Pat & Alex Thompson, fire couple, mid-30s

Features they relied on

Monte Carlo simulation (2,000 trials, 24-factor correlated)
Guardrails withdrawal strategy
What-If scenario comparison
80-year forecast horizon
Sequence-of-returns risk analysis

Takeaway for readers with a similar situation

If you're within five years of a possible FIRE date, swap your fixed-withdrawal assumption for a guardrails strategy and re-run the Monte Carlo before you pull the trigger.

This is a composite profile built from real Horizons beta usage patterns, not a named individual. Numbers are representative of the stated situation but any one person's outcome will differ based on their own financial circumstances. See our disclaimer.

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