Retirement Planner

Retirement Spending Planner With Historical and Monte Carlo Stress Tests

Model whether a portfolio can sustain a spending plan through retirement using historical sequences, Monte Carlo simulation, and configurable income streams.

The Retirement Planner simulates retirement one year at a time: spending rule, income offsets, spending adjustments, then portfolio growth at that year's real return.

Use it to compare spending rules, stress-test against poor sequences, and see where a plan breaks before committing to an allocation or spending level.

What the planner models

  • Fixed-percentage, guardrail, and floor-and-ceiling spending rules.
  • Social Security, pensions, annuities, and one-time or recurring spending changes.
  • Historical sequence analysis and Monte Carlo variability in a single run.

Why generic retirement calculators fall short

Most calculators assume a constant real return and a single withdrawal rate. This planner lets you define the spending rule, overlay real income streams, and see how sequence risk and rule behavior interact year by year.

What to focus on

  • Success rate across historical and simulated paths.
  • How different spending rules trade stability for higher or lower withdrawal rates.
  • Which failure modes appear first: early drawdown, late longevity, or income-gap years.

What to read alongside it

  • Retirement Planner Docs for input definitions and modeling caveats.
  • Pre-Tax vs Roth for contribution-phase decisions that affect the starting balance.
  • Monte Carlo Docs for the simulation methodology shared with this tool.

FAQ

Does the planner account for taxes during retirement?

Not directly. Values are shown in real (constant purchasing-power) dollars. Tax drag on withdrawals should be factored in when choosing a spending level.

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