Introducing VACR: The Volatility-Adjusted Crediting Rate

By the InsuriShield Analytics Desk

An indexed universal life (IUL) illustration almost always rests on a single, flat number: a level annual crediting rate — 7%, 7.5%, sometimes higher — carried forward for thirty or forty years. It looks innocent. It is the most consequential assumption in the entire document, and it almost always errs in the same direction: too high. We built a metric to quantify how much too high. We call it the Volatility-Adjusted Crediting Rate, or VACR.

Why a flat rate flatters the policy

An indexed account does not earn a flat rate. It earns an index return that is floored (often around 0–1%) and capped (a moving ceiling the carrier resets). A flat-rate illustration quietly assumes the policy earns the same number every year. Real index-linked accounts do not: they earn near the cap in strong years, the floor in bad ones, and something in between the rest of the time — and the sequence of those years matters enormously. Two policies with an identical long-run average can end in very different places depending on when the weak years land.

There is a subtler problem, too. The floor and cap make the return distribution asymmetric: the upside is clipped by the cap while the downside is only partly cushioned by the floor. Averaging that asymmetry into one ‘expected’ rate overstates the typical outcome, because it quietly credits the policy for upside it could never actually capture. The flat rate on the page is closer to a best case than a realistic center.

What VACR actually is

“VACR is the single flat crediting rate that reproduces the median outcome of a full, volatility-aware simulation — the honest translation of an illustrated rate into the rate a policy is actually likely to live.”

To derive it, we run thousands of Monte Carlo trials of the policy's real mechanics — its actual cost-of-insurance curve, charges, floor, and a cap allowed to drift the way carriers actually move caps — producing a full distribution of cash-value outcomes. Then we solve for the constant crediting rate that, dropped into an ordinary deterministic projection, lands exactly on the median of that distribution. That constant rate is the VACR. It lets an advisor keep using a simple flat-rate projection for planning, but anchored to a realistic center of gravity instead of an optimistic one.

A small rate gap, an outsized consequence

The reason VACR matters is that the gap between an illustrated rate and its VACR is rarely small in effect, even when it looks small in size. Shaving a couple of points off the crediting rate does not reduce the policy's prospects proportionally — it can flip the policy's internal engine from self-sustaining to unsustainable. Cost of insurance rises roughly exponentially with age, while account value compounds at the credited rate. When crediting falls a few points below the illustration, compounding can no longer outrun the rising charges, and the cash value the policy needs to stay in force without new premiums climbs sharply.

How to use it

For an advisor, trustee, or fund, VACR turns ‘the illustration says 7.5%’ into a question you can answer: what rate should I actually trust for planning? Re-run the funding plan at the VACR instead of the illustrated rate and the truth surfaces immediately — how much cash the policy really needs, whether the planned premiums are enough, and how much margin (if any) exists before the policy is at risk. It reframes an indexed policy from a marketing number into a risk-managed asset.

We compute a VACR for every inforce policy we model. In our experience it is the fastest way to see whether a policy that looks on track actually is — long before a statement arrives to deliver the bad news.

InsuriShield analyses are mathematically derived and provided for informational purposes — they are not legal, financial, or medical advice.