A long-term return assumption can be useful while estimating future wealth. It becomes less dependable when the same portfolio must also fund regular withdrawals through changing market conditions.
Accumulation and Withdrawal Are Different
During the accumulation years, market declines may allow ongoing investments to purchase more units. In retirement, withdrawals during a decline can reduce the capital available to participate in a later recovery.
This is why a retirement plan should test a range of market paths rather than relying only on one average annual-return figure.
Retirement readiness depends on the path of returns, the withdrawal pattern, inflation, and the flexibility available when conditions change.
Questions Worth Testing
- Withdrawal pressure: How much income must the portfolio provide each year?
- Early-retirement risk: What happens if weak markets arrive during the first few years?
- Inflation: How will increasing household costs affect future withdrawals?
- Flexibility: Which expenses or withdrawals could be adjusted temporarily?
A Better Planning Lens
Instead of asking whether a portfolio can earn a fixed return every year, ask whether the overall strategy can support changing withdrawals across several plausible conditions. That shifts the conversation from return prediction to financial resilience.