Instead of assuming that one withdrawal rate is “safe,” test the actual retirement cash flows against many market paths and a chosen confidence target. Government pensions and lower spending later in retirement can support a very different result than a flat withdrawal rule suggests.
What the 4% rule does—and does not do
The well-known 4% rule comes from historical portfolio research and is often interpreted as withdrawing roughly 4% of the starting portfolio in year one, then increasing the dollar amount with inflation. It is not a Canadian tax rule and it does not automatically account for CPP, OAS, RRIF minimums, TFSA withdrawals, home decisions or an individual’s actual tax profile.
Retirement spending often changes with age
Many households spend more in the active early years of retirement, somewhat less later, and less again at advanced ages—although health and care costs can change that pattern. Modeling Go-Go, Slow-Go and No-Go spending phases can therefore be more realistic than assuming one inflation-adjusted spending level forever.
Use a confidence target, not a promise
Monte Carlo analysis tests the plan against many different sequences of market returns. A “90% confidence” result means the modeled plan succeeded in roughly 90% of the simulated paths under the assumptions used. It is not a 90% guarantee. Assumptions can be wrong, tax rules change and real investment returns do not follow a perfect statistical distribution.
How the safe-spending optimizer works
The planner estimates the highest Go-Go, Slow-Go and No-Go lifestyle spending consistent with a user-selected confidence target while keeping planned one-time expenses in the model. This produces a spending estimate tied to the household’s actual assets, benefits, taxes and timing.
Estimate sustainable retirement spending
Run Monte Carlo analysis and compare your planned spending with the tool’s safe-spending estimate.