Spending Policy and the Preservation of Purchasing Power

The decision in brief

Define essential and discretionary distributions, specify the valuation base and payment timing, and model the return required to preserve purchasing power after spending and costs. Compare smoothing rules with explicit affordability limits. A funding shortfall should prompt discussion of spending, contributions, or objectives before it becomes an instruction to take more investment risk.

Specify what the portfolio must pay

Separate recurring household support, portfolio operating costs, one-off purchases, and discretionary gifts. Identify which payments can change, who can authorize changes, and how much notice recipients need. The committee cannot evaluate sustainability if all outflows are combined into one percentage while some are unavoidable and others can be deferred without undermining the family's core objectives.

CFA Institute Research Foundation's University Endowments: A Primer describes moving-average, inflation-linked, and hybrid spending rules. Those institutional methods provide useful design choices, not automatic prescriptions for a family. Family liabilities, tax circumstances, outside income, and flexibility can differ substantially from those of a university. Choose a rule because it fits the obligations, not because an institution uses it.

Distinguish nominal gains from real resources

A nominal investment gain does not measure the change in purchasing power. For a simplified one-period calculation, real return equals one plus nominal return divided by one plus inflation, minus one. With purely illustrative returns of 6% and inflation of 3%, the real return before withdrawals is about 2.91%, not exactly 3%. Neither assumption is a market forecast.

Select an inflation reference that is relevant to the obligations and acknowledge its limitations. A family's housing, education, or foreign-currency expenses may not track a broad consumer index. Show investment expenses and taxes separately rather than hiding them in a convenient real-return target. Be clear whether reported performance is gross or net of the particular costs used in the spending calculation.

Work backward from a synthetic funding requirement

Assume USD 50 million of starting assets, USD 2 million of annual distributions, USD 250,000 of costs, and a 3% inflation adjustment to the capital-preservation objective. For this synthetic example only, both distributions and costs leave at the beginning of the year. Invested assets are therefore USD 47.75 million, while the desired ending asset value is USD 51.5 million.

The required investment return on that remaining capital is 51.5 divided by 47.75, minus one, or about 7.85%. This is arithmetic conditional on the stated timing, not an expected return or safe withdrawal rate. Moving payments to year-end changes the result. If the requirement is unacceptable, the committee must reconsider spending, outside contributions, or preservation goals rather than simply assuming markets will deliver it.

Evaluate smoothing and affordability together

Suppose a synthetic policy distributes 4% of the average of three annual valuations: USD 50 million, USD 48 million, and USD 46 million. The average is USD 48 million and the proposed payment is USD 1.92 million. If current assets have since fallen to USD 36 million, that payment represents 5.33% of current assets. Smoothing stabilizes payments but can delay adjustment to losses.

Compare the proposed distribution with an explicit current-asset affordability check and a liquidity check. A committee could review exceptional payments above a predeclared limit, but the example does not establish a suitable limit. Test how a floor, ceiling, or inflation linkage behaves over several poor years. A rule that smooths one year may accumulate a larger adjustment for later recipients.

Stress the sequence of withdrawals and losses

Two paths with similar average investment returns can support different spending outcomes when withdrawals occur between gains and losses. Model actual payment timing and starting balances, not only a long-run average. Include an early drawdown, several weak years, and a period of unexpectedly expensive essential spending. Track remaining capital and payment coverage after every period, rather than just the final result.

James Garland's CFA Institute Research Foundation brief, A Cash-Flow Focus for Endowments and Trusts, challenges reliance on market-value spending formulas and emphasizes spendable cash. Use that argument as a reason to inspect funding sources, not to assume that dividends or coupons are inherently safer than a total-return approach. Compare each proposed rule against the family's full liability schedule and investment risks.

Make adjustment authority explicit

Approve a payment calendar, a measurement date, treatment of exceptional expenses, and the process for revising distributions. Specify which costs are included in the spending limit and whether unspent amounts carry forward. Without those definitions, different reports can show different withdrawal rates while all appear internally consistent. Communicate potential adjustments before recipients build permanent commitments around a provisional amount.

Implementation questions include who updates the inflation input, how outside income is verified, and what triggers an extraordinary review. The committee should see both purchasing-power progress and near-term liquidity. Record why spending was maintained or changed during difficult periods. A transparent policy can accommodate judgment, but an undocumented exception makes the next decision harder to evaluate and can create inconsistent treatment across beneficiaries.

Decision points

A required return is a funding calculation, not evidence that the return is available.
Smoothing payments can increase the burden on assets after a drawdown.
Define spending flexibility and adjustment authority before adverse conditions arrive.

Sources and further reading

The linked sources provide conceptual background. The worked examples and planning assumptions on this page are this publication's own illustrations.