Stress-Test Your FI Plan: Methodology

A decision stress test, not a success probability

How the FI Plan Stress Test works

The tool examines whether your resources and dependable income that does not require continued work can support protected spending and the lifestyle you choose. It compares a reference environment with deliberately difficult conditions to reveal vulnerabilities and realistic responses.

Core Lifestyle is the self-defined, reality-tested ongoing life you want protected if required paid work permanently stops. It is not a temporary emergency budget. Include obligations, taxes, healthcare, maintenance/replacement, irregular costs, dependents and commitments you intend to preserve.

Chosen Lifestyle is the full ongoing life you choose and want funded, including your Core Lifestyle. The difference is valued choice, not waste. The amounts can be equal.

Protected spending should be realistic for many years: include obligations, healthcare, insurance, maintenance, replacement and irregular costs, dependents, and commitments you intend to preserve. For two adults, unresolved disagreement about what belongs in either lifestyle needs attention; a lower number does not automatically win.

Core stresses examine poor early investment returns, inflation alongside falling markets, a weak real-return decade, and a longer life. Additional stresses address relevant concentrated holdings, entered healthcare costs, a household expense, or interrupted part-time income in that work comparison.

These are constructed scenarios, not forecasts or a sample from which to calculate odds. They do not cover every possible event or combination.

Reading your spending outcomes and portfolio targets

The outcomes distinguish maintaining Chosen Lifestyle, relying on temporary backup spending, and falling short of Core Lifestyle or the ending reserve. Stress outcomes show what happened in constructed scenarios, not whether you occupy the Resilience stage. A favorable case does not cancel an exposed one.

Core Independence requires sustainable work-independent resources that can reasonably support your reality-tested Core Lifestyle across the planning horizon under defensible assumptions. Full Financial Independence applies that requirement to Chosen Lifestyle. This Stress Test does not assess all four dimensions or verify those stage boundaries.

Core Lifestyle target

An estimated portfolio requirement for Core Lifestyle in the reference environment, without paid work or a temporary spending cut. It is funding evidence, not a verified Core Independence boundary.

Chosen Lifestyle target

An estimated portfolio requirement for the full Chosen Lifestyle in the reference environment, without paid work or a temporary spending cut. It is not a verified Full Financial Independence boundary.

Stress-tested target

An estimated requirement across applicable core stresses, with conservative allowance for a realistic backup spending plan when needed.

The calculator first tests Chosen Lifestyle. It uses a temporary reduction only when a difficult environment cannot maintain that lifestyle, never below Core Lifestyle; an untested change or one the household has not agreed on receives less credit. A result that depends on adapting is different from one that maintains spending unchanged.

A temporary backup cut is a response to disruption, not a permanent Core Lifestyle definition. Historical reports retain their original numerical capacity bands and spending definitions; opening them does not reclassify them under the revised stages.

Reference funding findings distinguish below, near, and at/above each calculated lifestyle requirement. The bracket—not rounded chart values—determines the finding. Arbitrary coverage milestones do not define an FI stage. Unreviewed costs, an untested permanent core, household disagreement, or uncertain resources/income make findings provisional and determine the next review action.

Targets depend on your inputs, accounts, taxes, and the scenarios. They are rounded planning estimates—not guarantees, new FI stages, or precise boundaries between safe and unsafe. A selected work alternative is shown separately; work income may improve its outcomes but cannot establish work independence.

Changelog

A brief public record of what changed. Calculation details and security-sensitive implementation information are intentionally excluded.

A result you can revisit

This page describes the current tool. An older saved result may use an earlier approach; its saved version and conclusions remain unchanged. Reviewing your answers and completing an updated run creates a new result without rewriting the earlier one.