Definition
Cost of extra protection is the additional capital required to extend the planning horizon of a lifetime income arrangement, measured against the frictionless pool benchmark.
Why it matters
Self-managed drawdown and pooled arrangements respond very differently when the planning horizon is extended. In self-managed drawdown, the cost of extending the horizon scales with each additional year of certain payments. In pooled arrangements, the cost compresses, because the pool's mortality credits make later years inexpensive to fund. The cost of extra protection names this divergence and makes it measurable.
How it works
Cost of extra protection is computed by holding the income target constant and comparing the capital required to fund it to successively longer planning horizons. For solo drawdown, the cost rises roughly linearly with each additional year — five additional years of income require roughly five times the annual cost. For a frictionless pool or a real pooled arrangement, the cost rises sublinearly because mortality reduces the pool of survivors who will actually receive payments at later ages — five additional years of pooled income cost a fraction of what five additional years of solo drawdown cost, with the fraction depending on the survival curve at the relevant ages. The divergence between the two cost curves widens as the planning horizon lengthens, which is the structural finding that pooled arrangements compress the cost of extending planning horizons and self-managed arrangements do not.
In practice
For an individual deciding how to handle the tail of longevity uncertainty — the possibility of living to 95 or 100 — the cost of extra protection is the analytical question that should drive the decision. The conventional advisor framing tends to suggest extending the solo drawdown horizon as a way to “be safer,” without naming the cost of doing so. The cost of extra protection makes that cost explicit. A professional working in the cost-of-income framework can produce the divergent curves directly: at age 90 these arrangements cost X and Y; at age 95 they cost X' and Y'; at age 100 they cost X'' and Y''. The divergence is the case for pooling, expressed quantitatively rather than as a generic argument.
In the Longevity Standard Framework
Cost of extra protection is supporting vocabulary in the Longevity Standard framework, derived from the cost-of-income framework's treatment of the planning horizon parameter. It is the analytical content of the scenario library question on the cost of planning to live longer, and it is the finding that pooled arrangements deliver structurally that solo drawdown cannot. In the framework's vocabulary, the cost of extra protection is what differentiates the realized value of pooled arrangements at long planning horizons from their realized value at short horizons — the metric is more favorable to pooled arrangements at longer horizons because the cost-of-extra-protection curves diverge more steeply.
Related terms
- Cost of income
- Frictionless pool
- Solo drawdown
- Realized value
- Planning horizon risk
- Longevity tail risk
- Mortality credits
- Pooling multiplier