Retirement Planning Foundations

Start with the spending problem

Retirement planning is not simply about reaching a round portfolio number. The core question is how future spending will be funded and how reliable each income source is. Estimate essential and discretionary spending separately, then identify income that may come from state benefits, defined-benefit pensions, annuities, rental income, work, or investment withdrawals.

Because retirement can last for decades, model spending in inflation-adjusted terms. A fixed nominal budget can lose purchasing power over time.

Withdrawal risk

A portfolio that is being drawn down faces sequence-of-returns risk. Two portfolios can have the same average return but very different outcomes if one experiences large losses early, when withdrawals are also reducing capital. This is why a simple average-return model can be misleading near and during retirement.

Stress tests can include an early market decline, lower long-term returns, higher inflation, longer life expectancy and higher spending. The goal is not to predict which shock will happen but to see whether the plan has flexibility.

Liquidity and asset allocation

Near-term spending generally should not depend entirely on selling volatile assets at whatever price the market offers. A cash or short-duration reserve can provide flexibility, though holding too much cash can create inflation risk. The right balance depends on guaranteed income, spending needs and tolerance for market risk.

Asset allocation should reflect both the long horizon and the need to fund withdrawals. Rebalancing and spending rules can help prevent the portfolio from drifting into a risk level that no longer fits the plan.

Review, do not set and forget

Retirement plans should be revisited when spending, health, family responsibilities, housing, market conditions or regulations change. A withdrawal rate is a planning assumption, not a legal or natural constant.