Summary

Budget 2025 tax changes lift safe withdrawal rates to about 3.5–4.2% for lower-tax retirees, while higher-tax retirees should target about 3.0–3.5% or less. \nDynamic strategies (guardrails, skipping inflation raises) allow higher starting withdrawals but increase cash‑flow volatility; fixed real withdrawals give steadier income with lower SWRs. \nEarly inflation shocks and bad return sequences sharply reduce SWRs, so balanced portfolios (30–60% equity) and Monte Carlo–style planning improve sustainability.