The Projection Illusion in Retirement Planning
This page is part of the Wealth Solutions Network educational library.
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Financial projections are widely used in retirement planning. They present future outcomes as modeled paths based on assumptions about returns, spending, taxes, and time.
While projections can be useful, they create an illusion when treated as representations of how retirement systems actually behave. Models simplify reality. Retirement outcomes emerge from interacting constraints that projections often cannot capture.
This article explains why projections routinely overstate certainty and understate structural risk in retirement planning.
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WHAT PROJECTIONS ARE DESIGNED TO DO
Projections are tools for estimating potential outcomes under defined assumptions.
They are designed to:
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Illustrate possible ranges
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Compare scenarios under consistent inputs
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Translate assumptions into numerical form
Projections are not descriptions of how systems behave. They are conditional representations based on simplified inputs.
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THE ASSUMPTIONS PROJECTIONS REQUIRE
To function, projections rely on assumptions that must remain stable over time.
Common assumptions include:
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Consistent withdrawal patterns
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Predictable tax treatment
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Smooth interaction between income sources
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Recoverable market variability
These assumptions are necessary for modeling, but they are not guarantees. When conditions deviate, model accuracy declines.
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WHY PROJECTIONS STRUGGLE IN RETIREMENT
Retirement introduces constraints that are difficult to model accurately.
These include:
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Irreversible income recognition
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Threshold-based taxes and costs
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Sequencing and stacking effects
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Time-dependent rule interactions
These features create non-linear behavior. Small changes can produce disproportionate effects that projections often smooth over.
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AVERAGES VS. PATHS
Projections often emphasize average outcomes over long periods.
Retirement outcomes, however, are path-dependent. The order and timing of events influence results as much as the totals. Two plans with identical averages can produce very different experiences.
Averages describe distributions. They do not describe lived sequences.
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CONFIDENCE VS. DURABILITY
Projections tend to produce confidence by showing that a plan works under modeled conditions.
Durability depends on whether a system continues to function when conditions deviate from assumptions. A plan that performs well on average may fail under unfavorable sequencing or constraint interaction.
Projections evaluate possibility. They do not measure resilience.
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WHY THIS MATTERS
Understanding the projection illusion is necessary before:
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Interpreting model outputs
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Comparing retirement strategies
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Evaluating risk tolerance
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Assessing plan robustness
Without this understanding, confidence may be placed in models rather than in system design.
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SUMMARY
Projections are useful tools, but they are not representations of how retirement systems behave.
They depend on stable assumptions, linear interactions, and averages. Retirement systems operate with irreversibility, thresholds, sequencing, and uncertainty.
Recognizing the projection illusion is necessary for evaluating retirement plans realistically.
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