The short answer
Start with the whole decision.
Retirement readiness is not one savings target or withdrawal percentage. A useful plan connects spending, dependable income, taxes, healthcare, portfolio withdrawals, and the number of years the money may need to support.
- Start with spending and income gaps before choosing a withdrawal rate.
- Test weak-return and long-life paths, not only an average forecast.
- Revisit the plan when retirement timing, markets, or household needs change.